- Open Access
Antimutagenic and free radical scavenger effects of leaf extracts from Accacia salicina
© Boubaker et al; licensee BioMed Central Ltd. 2011
- Received: 20 September 2011
- Accepted: 1 December 2011
- Published: 1 December 2011
Three extracts were prepared from the leaves of Accacia salicina; ethyl acetate (EA), chloroform (Chl) and petroleum ether (PE) extracts and was designed to examine antimutagenic, antioxidant potenty and oxidative DNA damage protecting activity.
Antioxidant activity of A. salicina extracts was determined by the ability of each extract to protect against plasmid DNA strand scission induced by hydroxyl radicals. An assay for the ability of these extracts to prevent mutations induced by various oxidants in Salmonella typhimurium TA102 and TA 104 strains was conducted. In addition, nonenzymatic methods were employed to evaluate anti-oxidative effects of tested extracts.
These extracts from leaf parts of A. salicina showed no mutagenicity either with or without the metabolic enzyme preparation (S9). The highest protections against methylmethanesulfonate induced mutagenicity were observed with all extracts and especially chloroform extract. This extract exhibited the highest inhibitiory level of the Ames response induced by the indirect mutagen 2- aminoanthracene. All extracts exhibited the highest ability to protect plasmid DNA against hydroxyl radicals induced DNA damages. The ethyl acetate (EA) and chloroform (Chl) extracts showed with high TEAC values radical of 0.95 and 0.81 mM respectively, against the ABTS.+.
The present study revealed the antimutagenic and antioxidant potenty of plant extract from Accacia salicina leaves.
- Ethyl Acetate Extract
- Trolox Equivalent Antioxidant Capacity
- Petroleum Ether Extract
- Antimutagenic Activity
Exposure to genotoxic chemicals present in food, in the environment, and used in medical treatment can alter the genetic material permanently, and thus may lead cancer . On the other hand, oxidative stress, caused by reactive oxygen species (ROS), is known to cause the oxidation of biomolecules, leading to cellular damage. The tissue injury caused by ROS may include DNA protein and lipids damage [2, 3]. Antigenotoxic plant can counter or prevent the adverse effect caused by DNA-damaging chemicals . Drugs obtained from plants have been investigated for the possible presence of mutagenic and/or carcinogenic substances, following the criteria and norms established for synthetic medicines. Fortunately, numerous defense systems protect the cellular macromolecules against oxidation. DNA repair systems take charge of the oxidized bases, the basic site, and the single strand breaks generated by oxidative process. However, cell defences against oxidative stress are also known to decrease through changes in gene expression in response to oxidative stress . The detection and evaluation of the cytotoxic, mutagenic and carcinogenic effects of plant compounds are of fundamental importance in order to reduce the possible risks of these damaging effects. There is an increasing interest in the natural antioxidants contained in the medicinal and dietary plants, which are candidates for the prevention of oxidative damages. Antioxidants from dietary and medicinal plant sources, particularly those containing phenolic compounds, have a significant antioxidant activity . Modern pharmaceutical industries largely take profit of the diversity of secondary metabolites from vegetables for new drug research. This is the case of Accacia salicina, The genus Acacia is frequently used for the treatment of various illnesses because of their reputed pharmacological effects; published information indicates that Acacia has hypoglycemic effects , antibacterial,  anti-inflammatory activity , cestocial , spasmogenic and vasoconstrictor activities , antihypertensive and antispasmodic activities , antiagregation platelet effect , as well as an inhibitory effect against hepatitis C virus . The present study was designed to examine antimutagen, antioxidant potenty and oxidative DNA damage protecting activity of plant extract from Accacia salicina leaves in relation to their total polyphenol, tannin, sterol and flavonoid content.
6-hydroxy-2,5,7,8-tetramethylchroman carboxylic acid (Trolox). Xanthine oxidase (XOD) and 2,2'-Azino-bis-(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS) were obtained from Wako (Osaka, Japan). The mutagen 2- aminoanthracene (2-AA) was purchased from Acros Organics (New Jersey, USA), hydrogen peroxide (H2O2) and Methylmethanesulfonate (MMS) were purchased from Sigma-Aldrich (PO. St Louis, USA). Histidine, biotine and Agar-Agar from Difco (Paris, France). Aroclor 1254 was purchased from Supelco (USA).
2.2. Plant materials
A. salicina was collected from the Arid Region Institute (IRA) situated in the south east of Tunisia in October, 2003. Botanical identification was carried out by Pr. M. Chaib  (Department of Botany, Faculty of Sciences of Sfax). A voucher specimen (AS-10.03) has been kept in the Laboratory of Pharmacognosy, Faculty of Pharmacy of Monastir for future reference. The leaves were shade-dried, powdered, and stored in a tightly closed container.
2.3. Extraction procedure and preliminary phytochemical analysis
One hundred twenty grams of powder, from dried leaves, were sequentially extracted in a Soxhlet apparatus (6 h) (AM Glassware, Aberdeen, Scotland, United Kingdom) with petroleum ether, chloroform and ethyl acetate. We obtained the correspondent extracts for each solvant. These types of extracts, with different polarities, were concentrated to dryness and the residues were kept at 4°C. Then, each extract was resuspended in the adequate solvant.
Plant materials were screened for the presence of tannins, flavonoids, coumarins and sterols using the methods previously described by Boubaker et al..
The polyphenol content of A. salicina leave extracts was quantified by the Folin-Ciocalteau reagent as described by Yuan et al.. The Gallic acid (0.2 mg/mL) was used as a standard.
MO: Weight filter (mg), Mf: Weight of filter and precipitate (mg).
where ε; molar extinction coefficient (= l g-1 cm-1) of tannic acid (= 3.27 L g-1 cm-1).
2.4. Radical-scavenging activity on ABTS+•
An improved ABTS radical cation decolorization assay was used. It involves the direct production of the blue/green ABTS+. chromophore through the reaction between ABTS and potassium persulfate. Addition of antioxidants to the preformed radical cation reduces it to ABTS, to an extent and on a timescale depending on the antioxidant activity, the concentration of the antioxidant and the duration of the reaction. ABTS was dissolved in water to a 7 mM concentration. ABTS+. was produced by reacting ABTS stock solution with 2.45 mM potassium persulfate (final concentration) and allowing the mixture to stand in the dark at room temperature for 12-16 h before use. The ABTS+. solution was diluted with ethanol to an absorbance of 0.7 (± 0.02) at 734 nm. In order to measure the antioxidant activity of extracts, 10 μl of each sample at various concentrations (0.5, 2.5, 4.5, 7.5 and 9.5 mg/ml) was added to 990 μl of diluted ABTS+• and the absorbance was recorded every 1 min. We stop the kinetic reaction after 30 min. Each concentration was analysed in triplicate. The percentage decrease of absorbance at 734 nm was calculated for each point and the antioxidant capacity of the test compounds was expressed as percent inhibition (%). Trolox (6-hydroxy-2,5,7,8-tetramethylchroman- 2-carboxylic acid) is used as a standard in comparison for the determination of the antioxidant activity of a compound. The results are also reported as the Trolox equivalent antioxidant capacity (TEAC), which is the molar concentration of the Trolox giving the same percentage decrease of absorbance of the ABTS as 1 mg/ml of the antioxidant testing extract, at a specific time point .
2.5. DNA strand scission assay
DNA damage and DNA protecting activity of extracts were detected on pBluescript KS DNA vector. Plasmid DNA was amplified and extracted from E.coli DH5α then oxidized with H2O2 +UV treatment in the presence or absence of the tested extracts and checked on 0.7% agarose in 1X TAE buffer (2 M Tris, 1M Sodium Acetate, 50 mM EDTA, pH = 8) according to the method described by Russo et al. with some modifications. In brief, the experiments were performed in a volume of 9 μl in an Eppendorf tube containing 2.34 μg of plasmid DNA, H2O2 was added to a final concentration of 147 mM with and without 4 μl of extracts at various concentrations.
The reaction was initiated by UV irradiation and continued for 5 min on the surface of UV transilluminator (Bioblock Scientific, TF35 C, France) with intensity of 180W, at 254 nm under room temperature. After irradiation, the mixture was incubated at room temperature during 15 min. Finally, the reaction mixture along with gel loading dye was placed on 0.7% agarose gel for electrophoresis. Untreated pKS DNA was used as a control in each run of gel electrophoresis. Gel was stained with ethidium bromide and photographed with Bio-print (Vilbert lourmat, France).
2.6. Bacterial strains
Salmonella typhimurium strains TA102 and TA104 which are histidine-requiring mutants, were kindly provided by Pr.I. Felzen, (Universidade do Estado do Rio de Janeiro [UERJ], Rio de Janeiro, Brazil), and maintained as described by Maron and Ames . The genotypes of the test strains were checked routinely for their histidine requirement, deep rough (rfa) character, UV sensitivity (uvrB mutation) and presence of the R factor. They were stored at -80°C. S. typhimurium TA104 and TA102 strains are known to be more responsive to certain mutagens as (2-AA) and (MMS) [23, 24].
Strains TA102 and TA104 contain AT base pairs at the hisG428 mutant site. The mutation is carried on the multi-copy plasmid pAQ1 in strain TA102 and on the chromosome in strain TA104. The plasmid confers tetracycline resistance, which is a convenient marker to detect the presence of the plasmid. The hisG428 mutation is an ochre mutation, TAA, in the hisG gene which can be reverted by all six possible base-pair changes; both transitions and transversions. This mutation is also reverted by mutagens that cause oxidative damage .
2.7. S9 preparation
The S9 microsome fraction is prepared from livers of rats treated with Aroclor 1254 . The components of S9 mix were 8 mM MgCl2, 32.5 mM KCl, 5 mM G6P, 4 mM NADP, 0.1 M sodium phosphate buffer (pH = 7.4), and S9 fraction at a concentration of 0.68 mg/ml of mix. The S9 mix was prepared freshly for each assay.
2.8. Salmonella-microsome assay
One hundred microliters of an overnight culture of bacteria (cultivated for 16h at 37°C, approximate cell density (2-5) × 108 cells/ml) and 500 μl of sodium phosphate buffer (0.2 M, pH 7.4 for assay without S9) or 500 μl of S9 mix were added to 2 ml aliquots of top Agar (supplemented with 0.5 mM L-histidine and 0.5 mM D-biotine) containing different concentrations of each extract. The resulting complete mixture was poured on minimal agar plates prepared as described by Maron and Ames . The plates were incubated at 37°C for 48 h and the revertant bacterial colonies of each plate were counted. Negative and positive control cultures gave numbers of revertants per plate that were within the normal limits found in the laboratory. An extract was considered mutagenic if the number of revertants per plate was at least doubled in S.typhimurium TA104 and TA 102 strains over the spontaneous revertant frequency [23, 26]. Data were collected with a mean ± standard deviation of three plates (n = 3).
2.9. Antimutagenicity testing
A modified plate incorporation procedure  was employed to determine the effect of all isolates on 2-amino anthracene (2-AA) and Methylmethane sulfonate (MMS) induced mutagenicity. In brief, 0.5 ml of S9 mixture for indirect mutagen (2-AA) and 0.5 ml of phosphate buffer for direct mutagen MMS was distributed in sterilized capped tubes in an ice bath, then 0.1 ml of test compounds and/or 50 μl of mutagen and 100 μl of test compound and 0.1 ml of bacterial culture (prepared as described in mutagenicity test) were added. After vortexing gently and preincubating at 45°C for 30 min, 2 ml of top agar supplemented with 0.05 M L-histidine and D-biotine were added to each tube and vortexed for 3 s. The resulting, entire was overlaid on the minimal agar plate. The plates were incubated at 37°C for 48 h and the revertant bacterial colonies on each plate were counted. The inhibition rate of mutagenicity (%) was calculated relative to those in the control group with the mutagen by the following formula: percent inhibition (%) = [1 - ((number of revertants on test plates - number of spontaneous revertants)/(number of revertants on positive control plates - number of spontaneous revertants))] × 100.
Each dose was tested in triplicate.
2.10. Statistical analyses
Data are expressed as mean ± standard deviation from three replicates. The statistical analyses were performed with STATISTICA edition 99 France. Duncan test was used to compare tested compounds vs. positive control. Difference was considered significant when P < 0.05.
3.1. Phytochemical study
Phytochemical screening of extracts from Accacia salicina
3.2. Determination of Total Polyphenol, Flavonoid, tannins and sterols Contents
Quantitative phytochemical screening of extracts from Accacia salicina leaves
Extract content (%)
1.9 ± 0.01
2.2 ± 0.01
3.62 ± 0.008
3. 31 ± 012
12.5 ± 0.02
5 ± 0.007
2 ± 0.01
3.3. ABTS-scavenging activity
The antioxidant activity of a given compound depends not only on its chemical structure but also on the type of the generated radical it can neutralize. For this reason, we tested the antioxidant potential of the A. salicina extracts against more than one radical type. The antioxidant activity measurements of the A. salicina extracts, against ABTS•+, was expressed as Trolox equivalent antioxidant capacity (TEAC). Since TEAC is a quantification of the effective antioxidant activity of the extract, a higher TEAC would translate a greater antioxidant activity of the tested sample.
TEAC of ABTS radical formation by Acaccia salicina leaf extracts
Inhibition percentage a (%)
TEAC values mM
1.86 ± 1.11
10. 5 ± 2.23
16.7 ± 2.36
0.24 ± .008
28 ± 1.11
41.5* ± 2.18
2.52 ± 2.03
19.2 ± 2.53
1.91 ± 0.08
0.81 ± 0.007
57.8* ± 2.81
72.20* ± 3.82
91* ± 1.65
5.52 ± 2.06
28 ± 1.68
90. 2* ± 2. 12
1.2 ± 0.04
0.95 ± 0.004
99.28* ± 1.92
0.26 ± 0.03
3.4. Effect of Accacia salicina extracts on pKS plasmid DNA scission induced by hydroxyl radicals
In order to evaluate the ability of the extracts to generate breaks in the phosphodiester bands of DNA, or unlike to protect DNA against the effect of hydroxyl radicals generated by the photolysis of hydrogen peroxide exposed to UV light, plasmid DNA was treated with different concentrations of each extract.
DNA derived from pKS plasmid showed two bands on agarose gel electrophoresis (lane A) the faster moving prominent band which corresponded to the native supercoiled circular DNA and the slower moving band was the open circular form. The UV irradiation of DNA in the presence of H2O2 resulting the cleavage of native supercoiled circular DNA to give prominent open circular form and a faint linear DNA indicating that OH. generated from UV-photolysis of H2O2 produced DNA strand scission.
The results showed that the treatment with all extracts doses, did not result in changes in plasmid DNA conformation. These observations suggest that if the extracts cause DNA damage, it is not through direct DNA chain breakage.
3.5. Mutagenic activity of extracts
No one of the tested extracts induced significant increase of the revertant number of S. typhimurium TA102 and S. typhimurium TA104 strains, as well with as without metabolic activation (S9) (table 3). It was inferred that neither A.salicina extracts nor their metabolits exhibit a mutagenic effect.
3.6. Antimutagenicity assay
Doses of 5 and 10 μg/plate of (2-AA), 325 and 130 μg/plate of (MMS) were chosen for the antimutagenicity studies with respectively TA104 and TA102 strains. Since these doses were not toxic and induced 1149 ± 15 (5 μg/plate of 2-AA), and 2144 ± 23 (325 μg/plate of MMS) revertants in S. typhimurium TA104. (2-AA) at the concentration of 10 μg/plate induced 652 ± 10 revertants and (MMS) at the concentration of 130 μg/plate induced 1721 ± 24 revertants, in TA102 strain.
Mutagenic effect of different Accacia salicina leaf extracts in S.typhimurium TA104 and TA102 assay systems in the presence and absence of an exogenous metabolic activation system (S9)
312 ± 8
335 ± 11
244 ± 18
265 ± 25
2144 ± 23
1149 ± 15
1721 ± 24
652 ± 10
Petroleum ether extract
352 ± 21
375 ± 18
289 ± 11
294 ± 14
348 ± 14
369 ± 17
260 ± 14
284 ± 15
336 ± 16
361 ± 19
249 ± 13
270 ± 17
336 ± 10
359 ± 21
299 ± 13
304 ± 12
328 ± 11
353 ± 13
249 ± 13
289 ± 15
Ethyl Acetate extract
318 ± 10
344 ± 9
242 ± 15
275 ± 19
381 ± 15
363 ± 16
254 ± 22
304 ± 14
333 ± 17
356 ± 20
246 ± 12
294 ± 11
322 ± 25
340 ± 09
242 ± 18
272 ± 19
Effect of different extracts from Accacia salicina leaves on the mutagenicity induced by MMS in Salmonella thyphimurium TA104 and TA102 assay systems without S9
% inhibition of mutagenesis
% inhibition mutagenesis
312 ± 8
2144 ± 23
Petroleum ether extract
1454 ± 95
1239 ± 73
1712 ± 45
1265 ± 42
2002 ± 43
1325 ± 56
965 ± 99
996 ± 68
1135 ± 64
1016 ± 82
1266 ± 59
1099 ± 47
Ethyl acetate extract
1328 ± 58
1109 ± 73
1475 ± 98
1195 ± 42
1813 ± 54
1235 ± 56
Effect of different extracts from Accacia salicina leaves on the mutagenicity induced by 2-AA in Salmonella thyphimurium TA104 and TA102 assay systems in the presence of S9
% inhibition of mutagenesis
% inhibition of mutagenesis
335 ± 11
235 ± 12
1149 ± 15
652 ± 10
Petroleum ether extract
925 ± 46
520 ± 11
934 ± 14
582 ± 8
948 ± 10
1105 ± 28
638 ± 47
281 ± 16
764 ± 38
426 ± 17
Ethyl acetate extract
881 ± 22
506 ± 7
847 ± 34
476 ± 5
865 ± 52
584 ± 17
1077 ± 19
652 ± 6
PE extract was significant effective in reducing the mutagenicity caused by the indirect mutagen 2-AA, with 27.51% in the S. typhimurium TA104 assay system and 31.65% in the S. typhimurium TA102 assay system at a dose of 25 μg/plate. Whereas no antimutagenic significant effect is detect at the low tested doses in respectivrely the S. typhimurium TA102 and S. typhimurium TA104 assay systems.
Cellular mechanisms and external factors involved in the production of oxidative stress include the inflammatory response, auto-oxidation of catecholamine, xanthine oxidase activation, pro-oxidants activities of toxins. Scavengers counteract the damaging effects of reactive oxygen species . However, when the balance between these reactive species and antioxidants is altered, a state of oxidative stress results, possibly leading to permanent cellular damage.
Mutations are important early steps in carcinogenesis, therefore, a short term genetic test, such as the Salmonella/reversion assay and DNA strand scission assay, have been successfully used for the detection of mutagens/carcinogens, as well as of antimutagens/anticarcinogens . The absence of mutagenicity for PE, Chl and EA extracts of Accaia salicina in the two Salmonella tested strains TA102 and TA104, with and without (S9) activation system, as well as the absence of phosphodiester band breaks in plasmid DNA at any tested concentration of the different extracts, indicate that DNA does not seem to be revelant target for these extracts [30, 31].
In the present experiment we have first investigated the protective role of A. salicina extracts against the ABTS.+. EA extract revealed a best antiradical activity against ABTS radicals. This should be correlated to their chemical constituents as they are composed by polyphenols and flavonoids in EA extract against ABTS radical. This finding is supported by previous studies reported by Orhan et al.  who revealed that the sage polyphenols, including flavone glycosides, were found to display potent antioxidant activities free radicals. In the same context, Hirano et al.  and Engelmans et al.  demonstrated the flavonoids are able to directly capture the radical species, thus interrupting the radical step of propagation.
This highly activity exhibited by Chl and EA extracts may be correlated to another chemical content. The polyphenolic content appears to function as potent electron and hydrogen atom donors, and therefore should be able to terminate the radical chain reaction by converting the free radicals and the reactive oxygen species to more stable products. Similar observation about the polyphenolic constituents has been reported for several plant extracts such as tea [35, 36].
DNA strand scission induced by hydroxyl radicals. Hydroxyl radical is the most reactive radical known in chemistry. It can abstract hydrogen atoms from biological molecules, including thiols, leading to the formation of sulphur radicals capable to combine with oxygen to generate oxysulfur radicals, a number of which damage biological molecules . Althought, both (O2 .-) and H2O2 are potentially cytotoxic, most of the oxidative damage in biological systems is caused by the OH., which is generated by the reaction between (O2.-) and H2O2 in the presence of metal ions . The UV irradiation of DNA in the presence of H2O2 resulting the cleavage of Sc DNA to give a prominent Oc DNA and a faint linear DNA indicated that OH. generated from UV photolysis of H2O2 produced DNA strand scission. The tested extracts showed a significant inhibiting activity against hydroxyl radicals, with the different doses tested. Sterols which are the main constituents of PE and Chl extracts, and which are described as pocessing significant antioxidant activity [39, 40] are likely candidates for providing the antigenotoxic effect of these extracts. It is possible that these compounds inhibit the free radicals and ROS produced by oxidation and redox-cycling. We hypothesize that the sterols present in the PE extract, possess different antioxidant properties than those present in the Chl extract, and exhibited a weak scavenging effect than Chl extract against some free radicals. The molecules in the two extracts should have different polarities. These types of compounds; were reported, by many authors, to exhibit an inhibitory effect against some radical systems [41, 39, 40, 42].
In the other hand, the scavenging potential for hydroxyl radicals of Chl extract may be also correlated to its polyphenol content. In fact, polyphenols are an important group of pharmacologically active compounds. They are considered to be the most active antioxidant derivatives in plants [43, 44]. However, it has been shown that the phenolic content does not necessary follow the antioxidant activity. Antioxidant activity is generally the result of the combined activity of a wide range of compounds, including phenolics, peptides, organic acids and other components .
The chemical components of EA extracts should be better scavenger free radicals. In fact both of them contain flavonoids which are described by Rice-Evans  and Kumar and Chattopadhyay , as effective hydrogen donors, making extracts potent antioxidants. These compounds should also act through a variety of mechanisms including scavenging of ROS . We believe that the presence of such chemicals in the EA extract explain the important O2.- scavenging effect of both extracts. In a study employing a non-enzymatic system to generate superoxide radicals , it was shown that flavonoids are able to scavenge O2.-.
As far as antioxidants has attracted much interest with respect to their protective effect against free radical damage that may be the cause of many diseases including cancer, antimutagenic activity of A. salicina extracts was investigated in the present study.
In the present experimental conditions Chl extract was an effective antimutagen against two different types of genotoxic compounds direct and indirect acting mutagenes suggesting that the extracts can act through various mechanisms. They reduced frameshift mutagenicity induced by (2-AA) and (MMS), an direct-indirect acting agent, suggesting that they could interfere with the metabolic activation of promutagens, by functioning as blocking agents . The P-450 enzyme system catalyzes the formation of N-hydroxy derivatives, such as N- ydroxy-2- aminoanthracene (a metabolite that interacts with DNA). Thus, an alteration in the function of the enzyme may result in altered reaction rates and differential pathways of the metabolism of mutagens and carcinogens. In some cases, this modification provides protection against chemically induced mutagenesis. In fact, this effect is known to play a role in the antimutagenicity of some plant extracts [51, 52]. These data agree with the knowledge that anticarcinogenicity of polyphenols contributes to block the formation of carcinogen . However, the Chl extract may also directly protect DNA from the electrophilic metabolites of the mutagen given that favonoids provide strong nucleophilic centers, which enables them to react with electrophilic mutagens and form adducts that may result in the prevention of genotoxic damage . The observed antimutagenicity of the Chl extract in the TA102 strain (sensitive to oxidative damage) and TA104 strain is congruent with its strong antioxidant capacity. This result suggests that consumption of the studied plants could be an alternative for reducing genotoxic damage induced by free radicals. The observed antioxidant potential could be related to the presence of polyphenolic compounds [55–57]. Polyphenols, which are widely distributed in the plant kingdom and are present in considerable amounts in fruits, vegetables, spices, medicinal herbs, and beverages, have been used to prevent many human diseases, such as diabetes, cancers, and coronary heart diseases . The biological activities of polyphenols in different systems are believed to be due to their redox properties, which can play an important role in absorbing and neutralizing free radicals, quenching singlet and triplet oxygens, or decomposing peroxides .
Sterols, wich are the main constituents of PE extract, seem to be most likely candidates for providing the observed antimutagenic activity of this extract .
Protective effect of PE, Chl and EA extracts against the tested mutagens may probably adsorb the mutagen in a way similar to the carcinogen adsorption which has been associated with pyrrole pigments, such as hemin and chlorophyllin [60, 61].
The differents antimutagenic activity of Chl than EA and PE extracts could be explained by the antioxidant activity is often the result of the combined activity of a wide range of compounds, including phenolics, peptides, organic acids and other components  and to the different sensibilities of the two strains towards a given compound or complex .
In conclusion, the present study demonstrates that extracts of A. salicina possesses potent antioxidant and antimutagenic activities. These extract is capable of protecting against oxidative DNA damage. Further investigations on testing their in vivo activities and on isolation and characterization of the active compounds responsible for the antioxidant capacity of A. salicina leaf extracts are under way in our laboratory.
The authors declare that they have no competing interests.
We acknowledge the " Ministère Tunisien de l'Enseignement Supèrieur, de la Recherche et de la Technologie " for the support of this study.
- Bartolome A, Mandap K, David KJ, Sevilla F III, Villanueva J: SOS-red fluorescent protein (RFP) bioassay system for monitoring of antigenotoxic activity in plant extract. Biosens Bioelectron 2006, 21: 2114-2120. 10.1016/j.bios.2005.10.009View ArticlePubMedGoogle Scholar
- Fraga CG, Arias RF, Llessuy SF, Koch OR, Boveris A: Effect of vitamin E and seleniumdeficiency on rat liver chemiluminescence. Biochem J 1987, 2: 383-386.View ArticleGoogle Scholar
- ramarathan N, OSAWA NT, Namiki M, Tashiro T: J SCI fOOD Agri. 1986, 37: 719. 10.1002/jsfa.2740370803View ArticleGoogle Scholar
- Ben Sghair M, Boubaker J, Naffati Aicha, Limem I, Skandrani I, Bhouri W, Bouhlel I, Kilani S, Chekir Ghedira L, Ghedira K: Antimutagenic and Antioxidant Potentials of Teucrium Ramosissimum Essential Oil. Chem Biodiverity 2010, 7: 1-10. 10.1002/cbdv.200900185View ArticleGoogle Scholar
- Johnson FB, Sinclair DA, Guarente L: Molecular biology of aging. Cell 1999, 2: 291-302.View ArticleGoogle Scholar
- Gulcin I, Bursal E, Sehitoglu MH, Bilsel M, Goren AC: Polyphenol contents and antioxidant activity of lyophilized aqueous extract of propolis from Erzurum, Turkey. Food and Chem Toxicol 2010, 48: 2227-2238. 10.1016/j.fct.2010.05.053View ArticleGoogle Scholar
- Wadood A, Wadood N, Wahid Shah SA: Effects of Acacia arabica and Caralluma edulis on blood glucose levels of normal and alloxan diabetic rabbits. J Pak Med Assoc 1989, 39: 208-212.PubMedGoogle Scholar
- Sotohy SA, Sayed AN, Ahmed MM: Effect of tannin-rich plant ( Accacia nilotica ) on some nutritional and bacteriological parameters in goats. Deutsche Tierarztliche Wochenschrift 1997, 104: 432-435.PubMedGoogle Scholar
- Dafallah AA, Al-Mustapha Z: Investigation of the anti-inflammatory activity of Acacia nilotica and Hibiscus sabdariffa . Am J Chinese Med 1996, 24: 263-269. 10.1142/S0192415X96000323View ArticleGoogle Scholar
- Ghosh NK, Babu SP, Sukul NC, Ito A: Cestocidal activity of Acacia auriculiformis . J of Helmintol 1996, 70: 171-172. 10.1017/S0022149X00015340View ArticleGoogle Scholar
- Amos S, Akah PA, Odukwe CJ, Gamaniel KS, Wambede C: The pharmacological effects of an aqueous extract from Acacia nilotica seeds. Phytother Res 1999, 13: 683-685. 10.1002/(SICI)1099-1573(199912)13:8<683::AID-PTR534>3.0.CO;2-XView ArticlePubMedGoogle Scholar
- Gilani AH, Shaheen F, Zaman M, Janbaz KH, Shah BH, Akhtar MS: Studies on hypertensive and antispasmodic activities of methanol extract of Acacia nilotica pods. Phytother Res 1999, 14: 510-516.Google Scholar
- Shah BH, Safdar B, Virani SS, Nawaz Z, Saeed SA, Gilani AH: The antiplatelet aggregatory activityof Accacia nilotica is due to blockage of calcium influx through membrane calcium channels. General Pharmacol 1997, 29: 251-255.View ArticleGoogle Scholar
- Hussein G, Miyashiro H, Nakamura N, Hattori M, Kakiuchi N, Shimotohno K: Inhibitory effects of Sudanese medicinale plant eextracts on hepatitis C virus (HCV). Phytother Res 2000, 14: 510-516. 10.1002/1099-1573(200011)14:7<510::AID-PTR646>3.0.CO;2-BView ArticlePubMedGoogle Scholar
- Cheib M, Boukhris M: Flore succinct et illustré des zones arides et sahariennes de Tunisie. 1998, 49: 43-44.Google Scholar
- Boubaker J, Skandrani I, Bouhlel I, Ben Sghaier M, Neffati A, Ghedira K, Chekir-Ghedira L: Mutagenic, antimutagenic and antioxidant potency of leaf extracts from Nitraria retusa . Food and Chem Toxicol 2010, 48: 2283-2290. 10.1016/j.fct.2010.05.061View ArticleGoogle Scholar
- Yuan VY, Bone DE, Carrington F: Antioxidant activity of dulse ( Palmaria palmata ) extract evaluated in vitro. Food Chem 2005, 91: 485-494. 10.1016/j.foodchem.2004.04.039View ArticleGoogle Scholar
- Zhishen J, Mengcheng T, Jianming W: The determination of flavonoid contents in mulberry and their scavenging effects on superoxide radicals. Food Chem 1999, 64: 555-559. 10.1016/S0308-8146(98)00102-2View ArticleGoogle Scholar
- Skandrani I, Ben Sghaier M, Neffati A, Boubaker J, Bouhlel I, Kilani S, Mahmoud A, Ghedira K, Chekir-Ghedira L: Antigenotoxic and free radical scavenging activities of extracts from Moricandia arvensis . Drug Chem Toxicol 2007, 30: 361-382. 10.1080/01480540701522494View ArticlePubMedGoogle Scholar
- Pearson D: The Chemical Analysis of Foods. 7th edition. London: Churchill Livingstone; 1976:572.Google Scholar
- Gulcin I: Antioxidant properties of resveratrol: A structure-activity insight. Innovative Food Science and Emerging Technologies 2010, 11: 210-218. 10.1016/j.ifset.2009.07.002View ArticleGoogle Scholar
- Russo A, Acquaviva R, Campisi A, Srrenti V, Di Giacomo C, Virgata G: Bioflavonoids as antiradicals, antioxidants and DNA cleavage protectors. Cell Biol Toxicol 2000, 16: 91-98. 10.1023/A:1007685909018View ArticlePubMedGoogle Scholar
- Maron DM, Ames BN: Revised methods for the Salmonella mutagenicity test. Mutat Res 1983, 113: 173-215.View ArticlePubMedGoogle Scholar
- Nelson GM, Swank AE, Brooks LR, Bailey KC, George SE: Metabolism, microflora effects, and genotoxicity in haloacetic acid-treated cultures of rat cecal microbiota. Toxicology Science 2001, 60: 232-241. 10.1093/toxsci/60.2.232View ArticleGoogle Scholar
- Mortelmans K, Zeiger E: The Ames Salmonella /microsome mutagenicity assay. Mutat Resear 2000, 455: 29-60. 10.1016/S0027-5107(00)00064-6View ArticleGoogle Scholar
- Marques RCP, De Medeiros SRB, Da Silva Dias C, Barbosa-Filho JM, Agnez-Lima LF: Evaluation of the mutagenic potential of yangambin and of the hydroalcoholic extract of Ocotea duckei by the Ames test. Mutation Research 2003, 536: 117-120.View ArticlePubMedGoogle Scholar
- Lee KT, Sohn IC, Park HJ, Kim DW, Jung GO, Park KY: Essential moiety of antimutagenic and cytotoxic activity of hederagenin monodesmosides and bidesmosides isolated from the stem bark of Kalapanox pictus . Planta Medica 2000, 66: 329-332. 10.1055/s-2000-8539View ArticlePubMedGoogle Scholar
- Uliasz TF, Hewett SJ: A microtiter trypan blue absorbance assay for the quantitative determination of excytotoxic neuronal injury in cell culture. Journal of Neuroscience Methods 2000, 100: 157-163. 10.1016/S0165-0270(00)00248-XView ArticlePubMedGoogle Scholar
- Rausher R, Edenharder R, Platt KL: In vitro antimutagenic and in vivo anticlastogenic effects of carotenoids and solvent extracts from fruits and vegetables rich in carotenoids. Mutation Research 1998, 413: 129-142.View ArticleGoogle Scholar
- Kilani S, Ben Ammar R, Bouhlel I, Abdelwahed A, Hayder N, Mahmoud A, Ghedira K, Chekir-Ghedira L: Investigation of extracts from (Tunisian) Cyperus rotundus as antimutagens and radical scavengers. Environmental Toxicology and Pharmacology 2005, 3: 478-484.View ArticleGoogle Scholar
- Ben Ammar R, Bouhlel I, Valenti K, Ben Sghaier M, Kilani S, Mariotte AM, Dijoux-Franca MG, Laporte F, Ghedira K, Chekir-Ghedira L: Transcriptional response of genes involved in cell defense system in human cells stressed by H2O2 and pre-treated with (Tunisian) Rhamnus alaternus extracts: Combination with polyphenolic compounds and classic in vitro assays. Chemico-Biological Interactions 2007, 168: 171-183. 10.1016/j.cbi.2007.04.002View ArticleGoogle Scholar
- Orhan I, Kartal M, Naz Q, Ejaz A, Yilmaz G, Kan Y, Konuklugil B, Sener B, Choudhary MI: Antioxidant and anticholinesterase evaluation of selected Turkish Salvia species. Food Chem 2007, 103: 1247-1254. 10.1016/j.foodchem.2006.10.030View ArticleGoogle Scholar
- Hirano R, Sasamoto W, Matsumoto A, Itakura H, Igarashi O, Kondo K: Antioxidant ability of various flavonoids against DPPH radicals and LDL oxidation. J Nutr Sci Vitaminol 2001, 47: 357-362. 10.3177/jnsv.47.357View ArticlePubMedGoogle Scholar
- Engelmann MD, Hutcheson R, Cheng IF: Stability of Ferric Complexes with 3-Hydroxyflavone(Flavonol), 5,7-Dihydroxyflavone (Chrysin), and 3', 4'- Dihydroxyflavone. J Agric Food Chem 2005, 53: 2953-2960. 10.1021/jf048298qView ArticlePubMedGoogle Scholar
- Yen GC, Chen HY: Antioxidant activity of various tea extracts in relation to their antimutagenicity. J Agric Food Chem 1995, 43: 27-32. 10.1021/jf00049a007View ArticleGoogle Scholar
- Amorowicz R, Pegg RB, Rahimi-Moghaddam P, Barl B, Weil JA: Free radical scavenging capacity of selected plant species from the Canadian prairies. Food Chem 2004, 84: 551-562. 10.1016/S0308-8146(03)00278-4View ArticleGoogle Scholar
- Dahl MK, Richardson T: Photogeneration of superoxide anion in serum of bovine milk and in model systems containing riboflavin and amino acid. Journal of Dairy Science 1978, 61: 400-407. 10.3168/jds.S0022-0302(78)83613-3View ArticleGoogle Scholar
- Halliwell B: Reactive oxygen species in living systems: source, biochemistry, and role in human disease. Annal Journal Medical 1991, 91: 14-25.View ArticleGoogle Scholar
- Argolo ACC, Sant'Ana AEF, Pletsch M, Coelho LCBB: Antioxidant activity of leaf extracts from Bauhinia monandra . Bioresource Technology 2004, 95: 229-233. 10.1016/j.biortech.2003.12.014View ArticlePubMedGoogle Scholar
- Ben Mansour H, Boubaker J, Bouhlel I, Mahmoud A, Bernillon S, Ben Chibani J, Ghedira K, Chekir-Ghedira L: Antigenotoxic activities of crude extracts from Acacia salicina leaves. Environmental and Molecular Mutagenesis 2007, 48: 58-66. 10.1002/em.20265View ArticleGoogle Scholar
- Bouhlel I, Valenti K, Kilani S, Skandrani I, Ben Sghaier M, Mariotte AM, Dijoux-Franca MG, Ghedira K, Hininger-Favier I, Laporte F, Chekir-Ghedira L: Antimutagenic, antigenotoxic and antioxidant activities of Acacia salicina extracts (ASE) and odulation of cell gene expression by H2O2 and ASE treatment. TIV 2008, 22: 1264-1272.Google Scholar
- Shon MY, Choi SD, Kahng GG, SH N, Sung NJ: Antimutagenic, antioxidant and free radical scavenging activity of ethyl acetate extracts from wite, yellow and red onions. Food Chemi Toxicol 2004, 42: 659-666. 10.1016/j.fct.2003.12.002View ArticleGoogle Scholar
- Edenharder R, Grunhage D: Free radical scavenging abilities of flavonoids as mechanism of protection against mutagenicity induced by tertbutyl hydroperoxide or cumene hydroperoxide in Salmonella typhimurium TA102. Mutation Research 2003, 540: 1-18.View ArticlePubMedGoogle Scholar
- Park KY, Jung GO, Lee KT, Choi J, Choi MY, Kim GT, Jung HJ, Park HJ: Antimutagenic activity of flavonoids from the heartwood of Rhus verniciflua . J Ethnopharmacol 2004, 90: 73-79. 10.1016/j.jep.2003.09.043View ArticlePubMedGoogle Scholar
- Gallardo C, Jimenez L, Garcia-Conesa MT: Hydroxycinnamic acid composition and in vitro antioxidant activity of selected grain fractions. Food Chemi 2006, 99: 455-463. 10.1016/j.foodchem.2005.07.053View ArticleGoogle Scholar
- Rice-Evans CA, Miller NJ, Bramley PM, Pridham JB: The relative antioxidant activity of plant derived polyphenolic flavonoids. Free Rad Res 1995, 22: 375-383. 10.3109/10715769509145649View ArticleGoogle Scholar
- Kumar A, Chattopadhyay S: DNA damage protecting activity and antioxidant potential of pudina extract. Food Chem 2006, 100: 1377-1384.View ArticleGoogle Scholar
- Vundac VB, Brantner AH, Plazibat M: Content of polyphenolic constituents and antioxidant activity of some Stachys taxa. Food Chem 2007, 104: 1277-1281. 10.1016/j.foodchem.2007.01.036View ArticleGoogle Scholar
- Schuldta EZ, Farias MR, Ribeiro-do-Vallea RM, Ckless K: Comparative study of radical scavenger activities of crude extract and fractions from Cuphea carthagenensis leaves. Phytomed 2004, 11: 523-529. 10.1016/j.phymed.2003.05.005View ArticleGoogle Scholar
- Shu-Jing Wu, Lean-Teik Ng: Antioxidant and free radical scavenging activities of wild bitter melon ( Momordica charantia Linn. var. abbreviata Ser.) in Taiwan. LWT Food Sci Technol 2008, 41: 323-330. 10.1016/j.lwt.2007.03.003View ArticleGoogle Scholar
- Horn RC, Ferrao VVM: Antimutagenic activity of extracts of natural substances in the Salmonella /microsome assay. Mutagenesis 2003, 18: 113-118. 10.1093/mutage/18.2.113View ArticlePubMedGoogle Scholar
- Zani F, Cuzzoni MT, Daglia M, Benvenuto S, Vampa G, Mazza P: Inhibition of mutagenicity in Salmonella typhimurium by Glycyrrhiza glabra extract, glycyrrhizinic acid,18 alpha-, and 18 beta-glycyrrhetinic acids. Planta Medica 1993, 59: 502-507. 10.1055/s-2006-959748View ArticlePubMedGoogle Scholar
- Lin JK, Liang YC: Cancer Chemoprevention by Tea Polyphenols Proceedings of the National Science Council. ROC(B) 24, No. 1. 2000, 1-13.Google Scholar
- Marnewick LJ, Gelderblom CAW, Joubert E: An investigation on the antimutagenic properties of South African teas. Mutation Research 2000, 471: 157-166.View ArticlePubMedGoogle Scholar
- Galati G, O'Brien JP: Potential toxicity of flavonoids and others dietary phenolics: significance for their chemopreventive and anticancer properties. Free Radical Biology and Medicine 2004, 37: 287-283. 10.1016/j.freeradbiomed.2004.04.034View ArticlePubMedGoogle Scholar
- Okawa M, Kinjo J, Nohara T, Masateru O: DPPH (1,1-diphenyl-2-picrylhydrazyl) radical scavenging activity of flavonoids obtained from some medicinal plants. Biological Pharmaceutical Bullettin 2001, 24: 1202-1205. 10.1248/bpb.24.1202View ArticleGoogle Scholar
- Payet B, Sing CS, Smadia J: Assessment of antioxidant activity of cane sugars by ABTS and DPPH radical scavenging assays: determination of their polyphenolic and volatile constituents. Journal of Agricultural and Food Chemistry 2005, 53: 10074-10079. 10.1021/jf0517703View ArticlePubMedGoogle Scholar
- Broadhurst CL, Polansky MM, Anderson RA: Insulin-like activity of culinary and medicinal plant aqueous extracts in vitro. Journal of Agricultural and Food Chemistry 2000, 48: 849-852. 10.1021/jf9904517View ArticlePubMedGoogle Scholar
- Oswa T: Novel natural antioxidants for utilization in food and biological systems. In Post-harvest Biochemistry of Plant Food Materials in the Tropics. Edited by: Uritany I, Garcia VV, Mendoza EM. Tokyo: Japan Scientific Society Press; 1994:241-251.Google Scholar
- Ferguson RL, Philpott M, Karunasinghe N: Dietary cancer and prevention using antimutagens. Toxicology 2004, 198: 147-159. 10.1016/j.tox.2004.01.035View ArticlePubMedGoogle Scholar
- Ikuma NEM, Passoni HM, Biso IF, Longo CM, Cardoso PRC, Campaner SL, Varanda AE: Investigation of genotoxic and antigenotoxic activities of Melampodium divaricatum in Salmonella typhimurium . Toxicology In Vitro 2006, 20: 361-366. 10.1016/j.tiv.2005.08.012View ArticleGoogle Scholar
- Vundac VB, Brantner AH, Plazibat M: Content of polyphenolic constituents and antioxidant activity of some Stachys taxa. Food Chem 2007, 104: 1277-1281. 10.1016/j.foodchem.2007.01.036View ArticleGoogle Scholar
- Skandrani I, Bouhlel I, Limem I, Boubaker J, Bhouri W, Neffati A, Ben Sghaier M, Kilani S, Ghedira K, Ghedira-Chekir L: Moricandia arvensis extracts protect against DNA damage, mutagenesis in bacteria system and scavenge the superoxide anion. Toxicology in Vitro 2009, 23: 166-175. 10.1016/j.tiv.2008.10.010View ArticlePubMedGoogle Scholar
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