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 »  Abstract
 »  Introduction
 »  Materials and Me...
 »  Results
 »  Discussion
 »  Conclusion
 »  Acknowledgement
 »  References
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Year : 2009  |  Volume : 41  |  Issue : 5  |  Page : 227-232

In vitro antioxidant and antihyperlipidemic activities of Bauhinia variegata Linn

Department of Pharmacology, K. L. E. Society's College of Pharmacy, Bangalore, India

Date of Submission04-Jul-2008
Date of Decision23-Dec-2008
Date of Acceptance22-Oct-2009
Date of Web Publication24-Dec-2009

Correspondence Address:
G P Rajani
Department of Pharmacology, K. L. E. Society's College of Pharmacy, Bangalore
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0253-7613.58513

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 » Abstract 

Objectives : To evaluate the ethanolic and aqueous extracts of Bauhinia variegata Linn. for in vitro antioxidant and antihyperlipidemic activity.
Materials and Methods : Ethanolic and aqueous extracts of the stem bark and root of B. variegata Linn. were prepared and assessed for in vitro antioxidant activity by various methods namely total reducing power, scavenging of various free radicals such as 1,2-diphenyl-2-picrylhydrazyl (DPPH), super oxide, nitric oxide, and hydrogen peroxide. The percentage scavenging of various free radicals were compared with standard antioxidants such as ascorbic acid and butylated hydroxyl anisole (BHA). The extracts were also evaluated for antihyperlipidemic activity in Triton WR-1339 (iso-octyl polyoxyethylene phenol)-induced hyperlipidemic albino rats by estimating serum triglyceride, very low density lipids (VLDL), cholesterol, low-density lipids (LDL), and high-density lipid (HDL) levels.
Result : Significant antioxidant activity was observed in all the methods, (P < 0.01) for reducing power and (P < 0.001) for scavenging DPPH, super oxide, nitric oxide, and hydrogen peroxide radicals. The extracts showed significant reduction (P < 0.01) in cholesterol at 6 and 24 h and (P < 0.05) at 48 h. There was significant reduction (P < 0.01) in triglyceride level at 6, 24, and 48 h. The VLDL level was also significantly (P < 0.05) reduced from 24 h and maximum reduction (P < 0.01) was seen at 48 h. There was significant increase (P < 0.01) in HDL at 6, 24, and 48 h.
Conclusion : From the results, it is evident that alcoholic and aqueous extracts of B. variegata Linn. can effectively decrease plasma cholesterol, triglyceride, LDL, and VLDL and increase plasma HDL levels. In addition, the alcoholic and aqueous extracts have shown significant antioxidant activity. By the virtue of its antioxidant activity, B. variegata Linn. may show antihyperlipidemic activity.

Keywords: Antihyperlipidemic, antioxidant, Bauhinia variegata linn, triton

How to cite this article:
Rajani G P, Ashok P. In vitro antioxidant and antihyperlipidemic activities of Bauhinia variegata Linn. Indian J Pharmacol 2009;41:227-32

How to cite this URL:
Rajani G P, Ashok P. In vitro antioxidant and antihyperlipidemic activities of Bauhinia variegata Linn. Indian J Pharmacol [serial online] 2009 [cited 2023 Jun 7];41:227-32. Available from: https://www.ijp-online.com/text.asp?2009/41/5/227/58513

 » Introduction Top

Oxidation is one of the destructive processes, wherein it breaks down and damages various molecules. Oxygen via its transformation produces reactive oxygen species (ROS) such as super oxide, hydroxyl radicals, and hydrogen peroxide. They provoke uncontrolled reactions. [1] Molecular oxygen is an essential component for all living organisms, but all aerobic species suffer from injury if exposed to concentration more than 21%. [2]

Free radicals attack and induce oxidative damage to various biomolecules including proteins, lipids, lipoproteins, and DNA. [2],[3] The body possesses several defense systems comprising enzymes and radical scavengers. [1] Some of them constitute the repair systems for biomolecules that are damaged by the attack of free radicals. [3]

Antioxidants are compounds that act as inhibitors of the oxidation process and are found to inhibit oxidant chain reactions at small concentrations and thereby eliminate the threat of pathological processes. [1] Phenolic compounds present in medicinal plants have been reported to posses powerful antioxidant activity. [2] Flavanoids are a major class of phenolic compounds present in medicinal plants and are found to have a potential role in prevention of various diseases through their antioxidant activity. [4]

Bauhinia variegata Linn. (Ceasalpiniaceae) is a medium-sized deciduous tree found throughout India. It is traditionally used in bronchitis, leprosy, and tumors. The stem bark is used as astringent, tonic, and anthelmintic. [5],[6] Infusion of the leaves is used as a laxative and for piles. Dried buds are used in the treatment of worm infestations, tumors, diarrhea, and piles. [7] The stem bark is used in ayurveda for its antidiabetic activity. [8] So far, the stem bark has been investigated and reported to have antitumor, [9],[10] antibacterial, antifungal, antiulcer, and hepatoprotective activity. [11] Flavanone glycoside from root is reported to have anti-inflammatory activity. [12] The stem bark is reported to contain 5,7 dihydroxy and 5,7 dimethoxy flavanone-4-O-α-L rhamnopyrosyl-β-D-glycopyranosides, Kaempferol-3-glucoside, lupeol, and betasitosterol. Seeds contain protein, fatty oil-containing oleic acid, linoleic acid, palmitic acid, and stearic acid. Flowers contain cyanidin, malvidin, peonidin, and kaempferol. Root contains flavanol glycosides. [13],[14],[15],[16],[17]

Since polyphenolic compounds are present in the ethanolic and aqueous extracts of stem bark and root of B. variegata Linn., it was thought that it would be worthwhile to evaluate the plant for antioxidant activity. Lipids are one of the most susceptible targets of free radicals. [3] This oxidative destruction is known as lipid peroxidation and may induce many pathological events. Apart from antioxidant studies, the present study therefore also involves evaluation of antihyperlipidemic activity.

 » Materials and Methods Top

Plant material and extraction

The stem bark and root of B. variegata Linn. were procured and authenticated from Regional Research Institute, Bangalore. The authenticated stem bark and root were dried in shade and powdered coarsely. Extraction was done according to standard procedures using analytical grade solvents. Coarse powders of the root (1 kg) and stem bark (1.1 kg) were separately Soxhlet extracted with 90% ethanol. The aqueous extract was prepared using the same marc by the process of maceration. The extracts obtained were concentrated under reduced pressure to yield the ethanolic extract of stem bark and root (4.3 and 4.2%, respectively) and the aqueous extract of stem bark and root (2.4% each).

Preparation of test solution

The various extracts such as B. variegata stem alcoholic (BVSA), stem water (BVSW), root alcohol (BVRA), and root water (BVRW) extracts at various concentrations were prepared in water and used for in vitro antioxidant studies. Pilot studies were carried out for the ethanolic and aqueous extracts of stem bark and root of B. variegata for in vitro antioxidant studies and the concentrations at which the extracts gave good antioxidant activity was selected.


Albino male Wistar rats weighing between 150 and 200 g were procured from registered breeders. The animals were housed under standard conditions of temperature (25 ±2°C) and relative humidity (30-70%) with a 12:12 light-dark cycle. The animals were fed with standard pellet diet and water ad libitum. Approval of the Institutional Animal Ethics Committee (IAEC) of K.L.E. Society's College of Pharmacy, Bangalore, was obtained.

Acute toxicity studies

Acute toxicity studies for aqueous and ethanolic extracts of B. variegata Linn. were conducted as per OECD guidelines 423 [18] using albino Wistar rats. Each animal was administered the aqueous solution of the extract by oral route. The animals were observed for any changes continuously for the first 2 h and upto 24 h for mortality.

Antioxidant studies

The ability of the extracts to scavenge hydrogen peroxide, [19] DPPH (1,2-diphenyl-2-picrylhydrazyl) radical, [19] nitric oxide, [20],[21] superoxide radical, [4] and its reducing power [19] was determined at different concentrations.

Butylated hydroxy anisole (BHA) and ascorbic acid were used as standards for the various in vitro antioxidant studies. The percentage scavenging of various radicals were calculated using the following formula:

where A 0 is absorbance of the free radical alone and A 1 is absorbance of free radical in the presence of extract/standard. All the experiments were performed in triplicate.

Antihyperlipdemic activity

The method of Tamasi et al. [22] was used for evaluation of antihyperlipidemic activity. Albino Wistar rats weighing between 190 and 250 g were assigned to various groups of six animals each. Animals were fasted for 16 h prior to the experiment with water ad libitum. The various extracts, B. variegata stem-water extract (BVSW), ethanolic extract (BVSA), B. variegata root-water extract (BVRW), and ethanolic extract (BVRA) each at doses of 200 and 400 mg/kg body weight, simvastatin at 4 mg/kg and fenofibrate at 20 mg/kg, were administered p.o. to groups II to XI, respectively. Group I served as control. On the day of the experiment, the animals of the groups II-XI received the respective drugs by oral route. Simultaneously, all the animals received Triton WR-1339 at 100 mg/kg body weight by intraperitoneal route. The control animals were given only Triton WR-1339 at 100 mg/kg body weight. Serum cholesterol, triglyceride, and HDL were estimated at 6, 24, and 48 h using AGAPPE diagnostic kits. Blood samples were withdrawn by retroorbital puncture. Total cholesterol was estimated by CHOD-PAP methodology, Triglycerides by GPO-PAP methodology, and HDL by the precipitation method using phosphotungstate magnesium acetate reagent.


The chemicals DPPH (1,2-diphenyl-2-picrylhydrazyl), N-(1-Naphthyl) ethylenediamine dihydrochloride, Triton WR-1339, NADH, SNP, phenazine methosulphate, trichloro acetic acid, and potassium ferricyanide were purchased from Sigma Chemicals, St Louis, MO, USA. All other chemicals and reagents used were of analytical grade. UV-1700 Shimadzu UV-Vis spectrophotometer was used for in vitro anti-oxidant studies.

Statistical analysis

All the values are presented as mean α SD. Data were statistically analyzed by one-way ANOVA followed by post hoc test; P values < 0.05 were considered as statistically significant. Linear regression analysis was used for calculation of IC 50 .

 » Results Top

Acute toxicity studies

There was no mortality and noticeable behavioral changes in all the groups tested. The aqueous and ethanolic extracts of stem and root of B. variegata Linn. were found to be safe upto 2000 mg/kg body weight.

Hydrogen peroxide scavenging activity

At 10 μg/ml concentration, BVSW, BVSA, and BVRA produced H 2 O 2 scavenging activity comparable (P < 0.05) to that of the standards BHA and ascorbic acid, BHA, BVRW, BVRA, BVSW, and BVSA were found to have IC 50 (mean ± SD) of 9.917 ± 0.01, 10.95 ± 0.03, 11.74 ± 0.21, 10.78 ± 0.17, 10.23 ± 0.11, 9.85 ± 0.03, respectively [Figure 1] and [Table 1].

DPPH radical scavenging activity

The various extracts produced significant DPPH radical scavenging activity from 10 μg/ml. The IC 50 (mean ± SD) of ascorbic acid, BHA, BVRW, BVRA, BVSW, and BVSA were found to be 30.55 ± 0.52, 29.11 ± 0.03, 37.73 ± 0.37, 36.10 ± 0.50, 45.85 ± 0.49, 30.50 ± 0.16, respectively [Table 1].

Nitric oxide radical scavenging activity

Scavenging of nitric oxide by various extracts was found to be concentration dependent. Maximum inhibition of nitric oxide formation was produced by BVSA at concentration of 500 μg/ ml and had IC 50 of 362.90 ± 3.80 as against 368.00 ± 2.60 for BHA [Table 1] and [Table 2].

Total reducing power

From 50 μg/ml, all the extracts and standard-ascorbic acid and BHA showed reductive capabilities. At 500 μg/ ml, the reducing power of standards and extracts showed the following order: BHA > BVRA > BVSA > Ascorbic acid > BVSW > BVRW. Reducing power of BVSA and BVRA at 500 μg/ml was comparable (P < 0.05) to that of ascorbic acid [Table 2].

Superoxide anion radical scavenging activity

Superoxide anion radical generation was inhibited by BHA (standard) and extracts from 100 μg/ml. The various extracts produced significant superoxide radical scavenging activity in a concentration-dependent manner. BVSA showed the lowest IC 50 value (414 ± 6.22) followed by BHA (435.40 ± 7.78).

Antihyperlipidemic activity

Administration of Triton resulted in increase in serum levels of cholesterol, triglycerides, VLDL, and LDL. A significant reversal in serum levels of cholesterol, triglycerides, VLDL, and LDL levels was noticed in the animals treated with B. variegata Linn. root and stem extracts when compared with the control group [Table 2] and [Table 3].

Simvastatin (standard) produced maximum cholesterol- and LDL-lowering effect at both 6 h and 24 h. BVRW 400, BVRA 200 and 400 and BVSA 200 and 400 produced a significant decrease in serum cholesterol and LDL levels, which was found to be significantly greater than the effects of f enofibrate (at 6 h, 24 h and 48 h) and simvastatin (at 48 h) [Table 2].

Maximum reduction of triglyceride and VLDL levels was produced by fenofibrate at 6 h. At 24 h and 48 h, aqueous and ethanolic extracts of B. variegata root and stem produced significant triglyceride- and VLDL-lowering effect which was comparable to that of fenofibrate and significantly greater than that of Simvastatin [Table 4].

Simvastatin, fenofibrate, and various extracts exscept BVRW and BVRA 200 mg/kg produced significant (P < 0.01) increase in serum HDL level at 6, 24, and 48 h when compared to control. At 6 h and 24 h all the extracts except BVRA 200 and BVRW 400 produced a significant (P < 0.01) increase in HDL level, which was significantly greater than that of simvastatin and fenofibrate. At 48 h BVSW 200 and 400, BVRA 200 and BVRW 200 produced significant (P < 0.01) increase in HDL level, which was significantly greater than that of simvastatin and fenofibrate [Table 5].

 » Discussion Top

The potentially reactive derivatives of oxygen ascribed as ROS such as superoxide radical, hydroxyl radical, and hydrogen peroxide are continuously generated inside the human body as a consequence of exposure to exogenous chemicals and/or a number of endogenous metabolic processes involving redox enzymes and bioenergetic electron transfer. [4] Owing to the ROS overproduction and/or inadequate antioxidant defense, there is upsurge of ROS and this culminates in oxidative stress. It is quite interesting to note that plants have good antioxidant ability and are safer than the synthetic antioxidants. [4] The antioxidant activity can be attributed to various mechanisms like prevention of chain initiation, binding of transition metal ion catalysts, decomposition of peroxides, reductive capacity, and radical scavenging activity. [4]

In the present study, five different antioxidant methods for evaluation of antioxidant activity have been used. Ethanolic and aqueous extracts of B. variegata root and stem produced significant antioxidant activity. This can be attributed to the flavonoids and other phytoconstituents present in the extracts. Stem ethanolic extract produced significantly greater antioxidant activity than root ethanolic and aqueous extracts.

Hyperlipidemia is one of the important risk factors involved in the development of cardiovascular diseases. Atherosclerosis and congestive heart diseases are strongly associated with disorders of lipid metabolism and plasma lipoproteins. Triton WR-1339-treated rats are considered to be a useful acute hyperlipidemic model associated with inactive lipoprotein lipase. [23] Triton WR-1339 acts as a surfactant to block the uptake of lipoprotein from the circulation by extra hepatic tissues resulting in an increase in the level of circulatory lipoproteins. [24] Triton WR-1339-induced hyperlipidemic rats treated with BVSW, BVSA, BVRW, and BVRA produced reversal of increase in serum cholesterol and triglycerides and LDL from the 6 h upto 48 h and VLDL from 24 h.

Ethanolic and aqueous extracts of B. variegata root and stem produced significant cholesterol and LDL lowering effect at 6, 24, and 48 h. This indicates that B. variegata not only reduces the synthesis of cholesterol, but may also reduces its metabolism. The extracts were found to be enriched in flavanoids and it is reported that flavanoids are found to inhibit HMG-CoA reductase activity. [23] It may be concluded that the cholesterol-lowering effect of B. variegata stem and root extracts may be due to inhibition of HMG-CoA reductase activity. Simvastatin being a specific HMG-CoA inhibitor produces its hypocholesterolemic activity by reducing cholesterol synthesis.

Increase in triglyceride level was evident in control animals due to inhibition of lipoprotein lipase (LPL) by Triton. Treatment with ethanolic and aqueous extracts of B. variegata resulted in reduction of triglyceride levels. It is likely that treatment with B. variegata might have lowered the serum triglyceride level by activating LPL. LPL is a prime enzyme related to triglyceride metabolism. Further VLDL levels were reduced significantly at 24 and 48 h.

The various extracts also showed protective action by increasing serum HDL level. The increased HDL facilitates the transport of triglyceride or cholesterol from serum to liver where it is catabolized and excreted out of the body. Significantly greater increase in HDL levels was produced by aqueous extracts than ethanolic extracts.

 » Conclusion Top

The aqueous and ethanolic extracts of B. variegata Linn. have shown significant antioxidant activity. In the preliminary studies, it was found out that the aqueous and ethanolic extracts of B. variegata Linn. have shown promising antihyperlipidemic activity. B. variegata may partly owe its antihyperlipidemic activity to its antioxidant activity.

 » Acknowledgement Top

The authors thank the Director and the Principal, K. L. E. Society's College of Pharmacy, Bangalore for providing the facilities to carry out the work.

 » References Top

1.Nasik SR. Antioxidants and their role in biological functions: An overview. Indian Drugs 2003;40:501-15.  Back to cited text no. 1      
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3.Gopinathan N, Srinivasan KK, Mathew JE. Free radical scavenging properties of ethanol extract of Saccharum spontaneum. Indian Drugs 2004;41:633-5.  Back to cited text no. 3      
4.Gurpreet Kaur, Saqrwar AM, Zoobi J, Kaleem J, Mohemmad A. Evaluation of antioxidant activity of Cassia Siamea flowers. J Ethnopharmacol 2006;108:340-8.   Back to cited text no. 4      
5.The wealth of India, Raw materials. In: Ambasta SP, editor-in-chief. Vol. 2. B. New Delhi: Publication and information directorate, CSIR; 1998. p. 56-7.   Back to cited text no. 5      
6.Ram PR, Mehrotra BN. In: Compendium of Indian medicinal plants.Vol. 3. New Delhi: Publication and information directorate; 1980. p. 84-91.  Back to cited text no. 6      
7.Asima C, Satyesh CP. In: The treatise of Indian medicinal plants. Vol. 2. New Delhi: Publication and information directorate CSIR; 1992. p. 24-6.  Back to cited text no. 7      
8.Col Herber D. In: Useful plants of India. 2 nd ed. Dehradun: Allied Book Center; 1991. p. 75.  Back to cited text no. 8      
9.Rajkapoor B, Jayakar B, Murugesh N. Antitumour activity of Bauhinia variegata on Dalton′s ascitic lymphoma. J Ethnopharmacol 2003;89:107-9.  Back to cited text no. 9  [PUBMED]  [FULLTEXT]  
10.Rajkapoor B, Jayakar B, Murugesh N, Sakthisekaran D. Chemoprevention and cytotoxic effect of Bauhinia variegata against N-nitrosodiethylamine induced liver tumors and human cancer cell lines. J Ethnopharmacol 2006;104:407-9.  Back to cited text no. 10  [PUBMED]  [FULLTEXT]  
11.Bodakhe B, Jayakar B, Ram A. Hepatoprotective properties of Bauhinia variegata bark extract. Yakugaku Zasshi 2007;127:503-7.  Back to cited text no. 11      
12.Yadava RN, Reddy VM. Anti-inflammatory activity of a novel flavonol glycoside from the Bauhinia variegata Linn. Nat Prod Res 2003;7:165-9.  Back to cited text no. 12      
13.Yadava RN, Reddy VM. A new flavone glycoside, 5-hydroxy 7,3′,4′5′-tetra-methoxy flavone 5-O-b-D-xylopyranosyl-(1- > 2)-α-L-rhamnopyranoside from Bauhinia variegata Linn.J Asian Nat Prod Res 2001;3:341-6.   Back to cited text no. 13      
14.Silva JA, Damico DC, Baldasso PA, Mattioli MA, Winck FV, Fraceto LF, et al. Isolation and biochemical characterization of a galactoside binding lectin from B. variegata candida (BvcL) seeds. Protein J 2007;26:93-201.  Back to cited text no. 14      
15.Diciero L, Oliva ML, Torquato R, Kohler P, Weder JK, Camillo Novello J, et al. The complete amino acid sequence of a trypsin inhibitor from Bauhinia variegata var. candida seeds. J Protein Chem 1998;17:827-34.  Back to cited text no. 15      
16.Reddy MV, Reddy MK, Gunasekar D, Caux C, Bodo B. A flavanone and a dihydro dibenzoxepin from Bauhinia variegata. Phytochemistry 2003;64:879-82.  Back to cited text no. 16      
17.Zhao YY, Cui CB, Cai B, Han B, Sun QS. A new phenanthraquinone from the stems of Bauhinia variegata L. J Asian Nat Prod Res 2005;7:835-8.  Back to cited text no. 17      
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19.Ilhami G, Haci AA, Mehmet C. Determination of in vitro antioxidant and 15 radical scavenging activities of propofol. Chem Pharm Bull 2005;53:281-5.  Back to cited text no. 19      
20.Yaowared S, Yukihisa M, Michihisa T, Opa V, Kinzo M, Hiroshi W. Evaluation of the nitric oxide radical scavenging acitivity of Manganese Complexes of curcumin and its Derivative. Biol Pharm Bull 2004;27:170-3.  Back to cited text no. 20      
21.Kumar RS, Sivakumar T, Sunderam RS, Gupta M, Mazumdar UK, Gomathi P, et al. Antioxidant and antimicrobial activities of Bauhinia racemosa L. stem bark. Braz J Med Biol Res 2005;38:1015-24.  Back to cited text no. 21      
22.Tamasi G, Borsy J, Patthy A. Effects of 3-carboxyl-5-methylpyrazole (CMP) on serum and liver enzymes. Biochem Pharmacol 1968;17:1789-94.  Back to cited text no. 22      
23.Xie W, Wang W, Su H, Xing D, Cai G, Du L. Hypolipidemic mechanisms of Ananas comosus L. leaves in mice: Different from fibrates but similar to statins. J Pharmacol Sci 2007;103:267-74.  Back to cited text no. 23      
24.Umesh KP, Saraf S, Dixit VK. Hypolipidemic activity of seeds of Cassia tora Linn. J Ethnopharmacol 2004;90:249-52.  Back to cited text no. 24      


  [Figure 1]

  [Table 1], [Table 2], [Table 3], [Table 4], [Table 5]

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