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ISSN: 2161-1459
Journal of Clinical & Experimental Pharmacology
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Therapeutic Effect of Stereospermum suavelolens on Diabetic Nephropathy

Thirumalaiswamy Balasubramanian1*, Senthilkumar GP2, Karthikeyan M1 and Tapan Kumar Chatterjee3

1Department of Pharmacology, Al Shifa College of Pharmacy, Poonthavanam Post, Kizhattur Village, Perinthalmanna, Malappuram District, Kerala, India

2Department of Pharmaceutical Chemistry, Bharathi College of Pharmacy, Bharathi Nagara, Mandya, Karnataka, India

3Division of Pharmacology, Department of Pharmaceutical Technology, Jadavpur University, Kolkata, India

*Corresponding Author:
Dr. Thirumalaiswamy Balasubramanian
Department of Pharmacology, Al Shifa College of Pharmacy
Poonthavanam Post, Kizhattur Village,Perinthalmanna
Malappuram Dist, Kerala 679 325, India
Tel: +919544496752
E-mail: [email protected]

Received date: August 05, 2014; Accepted date: September 25, 2014; Published date: September 30, 2014

Citation: Balasubramanian T, Senthilkumar GP, Karthikeyan M, Chatterjee TK (2014) Therapeutic Effect of Stereospermum suavelolens on Diabetic Nephropathy. Clin Exp Pharmacol 4:162. doi: 10.4172/2161-1459.1000162

Copyright: 2014 Balasubramanian T, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Keywords

Stereospermumsuavelolens; Ethyl acetate fraction; STZ induced diabetic rats; Nephroprotective effect; Creatinine; Urea; Uric acid; In vivo antioxidant activity; Histopathological study

Introduction

Diabetes Nephropathy is a complex disorder that is characterized by elevated levels of serum glucose, creatinine and uric acid in addition to abnormal histopathological changes in kidney. Not with standing much research work, the diabetic kidney damages are increasing rapidly and patients with diabetes kidney failure undergo either painful dialysis or kidney transplantation [1] which is both costly and harmful. In the absence of reliable and effective modern nephroprotective drugs and available traditional medicines employed for the disease treatment, concerted efforts are currently channeled toward exploring complementary or alternative medicine from natural sources having potent antidiabetic as well as nephroprotective activity with fewer side effects. Traditional medicines and extracts from medicinal plants have been extensively used as alternative medicine for better control and management of diabetes nephropathy [2].

Stereospermumsuaveolens (Family: Bignoniaceae), popularly known as “padiri”, is a large deciduous tree distributed in the moist parts of India. Different parts of this plant have various therapeutic applications in native medicine. Traditionally, a decoction of the root is used for the treatment of inflammation, pain, fever, asthma, and vomiting [3,4]. The flowers mixed with honey are given orally for the control of hiccups [5]. In southern India the bark is used in folk medicine for the treatment of diabetes [3]. The fruit is useful for the treatment of leprosy. The plant root extract is known to possess anticancer activity due to the presence of lapachol [3,6]. Previous phytochemical studies showed presence of higher carboxylic acids, ß-sitosterol and saponin [3] in the roots, lapachol, dehydro-a-lapachone [7], sterekunthal B, sterequinone C, stere-ochenols A and B [8,9] in the bark, and stereolensin [6], scutellarein, 6-hydroxy luteolin [10], dinatin (4,5,7-trihydroxyl-6-methoxyflavon), and dinatin-7-glucuroniside [11] in the leaves. Previous studies in our laboratory showed that the ethanol extract of Stereospermumsuaveolens have anti diabetic activity in STZ induced diabetic rats. However, based on the literature survey, there is no scientific report proving the neproprotective effect of this particular species. Therefore, the current study was designed to evaluate the neproprotective activity of Stereospermumsuaveolens in STZ induced diabetic rats.

Materials and Methods

Chemicals

(STZ), Trichloro Acetic Acid (TCA), Thiobarbituric Acid (TBA), reduced Glutathione (GSH), TrisHCl, Sodium Dodecyl Sulfate (SDS), Nitro Blue Tetrazolium (NBT), reduced Nicotinamide Adenine Dinucleotide Phosphate (NADH), Dimetylsulfoxide (DMSO) and Phenazinemethosulfate (PMS) were purchased from SISCO Research Laboratory, Mumbai, India. Glibenclamide was obtained from Prudence PharmaChem, Ankeshwara, Gujarat, India. The solvents and chemicals used were of analytical grade.

Plant material

The plant was identified and authenticated by the Tropical Botanical Garden and Research Institute, Palode, Tiruvanthapuram district, Kerala and a voucher specimen (TBS-1) has been deposited in our laboratory for further reference. The bark of Stereospermumsuavelolens(Roxb.) DC was collected during October 2010 from Palode forest, Thiruvanthapuram district, Kerala, India. The bark of the plant was dried under shade and powdered with a mechanical grinder. The powdered plant material was then passed though sieve No# 40 and stored in an air tight container for future use.

Preparation of plant ethyl acetate fraction

The shade dried coarse powdered bark of Stereospermumsuavelolens (500 g) was packed in the soxhlet extraction apparatus and extracted with 1.5 L of 95% ethanol at a temperature of 40-50°C for 72 h. The extract was filtered and the filtered extract was then concentrated to dryness in a rotary evaporator under reduced pressure at temperature of 40°C. Then the crude ethanol extract of Stereospermumsuavelolens was fractionated with ethyl acetate. The resultant black color ethyl acetate fraction residue was stored in desiccators for use in subsequent experiments and the yield was 16.2% w/w. Weighed amount of ethyl acetate fraction was suspended in 5% DMSO in normal saline prior to oral administration.

Qualitative phytochemical analysis

Preliminary phytochemical screening was performed for the ethyl acetate fraction of EESS [12-14].

Animals

Male Wistar albino rats weighing 150-200 g and male Swiss albino mice weighing 20-25 g were purchased from M/S-Ghosh Enterprises, Kolkata, India. The animals were randomly grouped (n=6) and housed in polyacrylic cages (38×23×10 cm) and maintained under standard laboratory conditions (25 ± 2 °C) with dark and light cycle (14/10 h). They were allowed free access to standard dry pellet diet (Hindustan Lever, Kolkata, India) and water ad libitum. The rats were acclimatized to laboratory condition for 1 week before commencement of experiment. Ethical clearance was obtained from Jadavpur University Animals Ethical Committee for using animals in the present study.

Acute toxicity study

An acute oral toxicity study was performed as per Organization for Economic Co-operation and Development (OECD) 423 guidelines. Male Swiss albino mice (20-25 g) were randomly distributed in six groups of three each. The animals were fasted overnight, and the ethyl-acetate fraction was administered orally at a dose of up to 2000 mg/kg. The animals were closely observed for the first 24 h for any toxic symptoms and for 72 h for any mortality.

Experimental induction of diabetes

Rats were fasted for 16 h before the induction of diabetes with STZ. A freshly prepared solution of STZ (50 mg/kg) in 0.1 M cold citrate buffer, pH: 4.5, were injected intraperitoneally in a volume of 1 ml/kg [15] and the control rats were injected with citrate buffer alone. In order to control the hypoglycemia during the first day after the STZ administration, diabetic rats were given 5% glucose solution orally. Hyperglycemia was confirmed by the elevated fasting glucose levels in blood, determined at 48 h and then on day 6 after injection. Rats with moderate diabetes exhibiting fasting blood glucose levels in the range of 280-325 mg/100 ml were selected for the studies.

Nephroprotective activity study in diabetic rats (14 days)

Rats were fasted for 16 h and divided into five groups of six each [16]. Group I, nondiabetic control, were given 5% DMSO in normal saline orally at a dose of 5 ml/kg. Group II, STZ-diabetic control, received 5% DMSO in normal saline at a dose of 5 ml/kg orally. Group III and IV, STZ-diabetic rats, were treated with ethyl acetate fraction orally at a dose of 200 and 400 mg/kg, respectively. Group VII STZ-diabetic rats were administered with standard drug Glibenclamide at a dose of 0.5 mg/kg orally. The treatment was continued once daily for 14 days.

Effect of ethyl acetate fraction on serum and urine renal parameters

On the 15th day, blood was collected from the overnight-fasted rats by retro-orbital bleeding, using microcapillary technique. Fasting blood glucose level of each animal was determined. Serum was separated and used for the determination of biochemical parameters, such as creatinine, urea, uric acid and total proteins (using Automated Span Diagnostic Reagents, Mumbai, India). Rats were accommodated in metabolic cages for urine collection for 2 days in order to become familiar with the environment of the cage. Twenty-four hour urine samples were collected from all groups to determine urine total protein and albumin. After urine collection, all the rats were sacrificed by euthanasia. Kidneys were excised immediately and washed with ice cold saline solution.

Estimation of antioxidant enzyme assays

A 10% w/v of kidney homogenate was prepared in 0.15 M Tris-HCl buffer (pH: 7.4). The homogenate was centrifuged at 2000×g for 20 min at 4°C to remove the cell debris and then the supernatant was centrifuged (REMI C-24) at 12,000×g for 1 h at 4°C. The supernatant obtained were used for the determination of lipid peroxidation [17], reduced gluthathione content [18], Superoxide Dismutase (SOD) [19] and Catalase (CAT) [20].

Histopathological study

The fragments from the kidney tissues were fixed in 10% neutral formalin solution, embedded in paraffin, and then, stained with Hematoxylin (H) and Eosin (E). The sections were examined microscopically for the evaluation of histopathological changes.

Statistical analysis

The experimental data were expressed as mean ± SEM. The data were analyzed using ANOVA and Dunett’s test. The results were considered statistically significance if P<0.05.

Results

Phytochemical screening

The qualitative phytochemical analysis of the ethyl acetate fraction revealed the presence of flavonoids, tannins, alkaloids, saponins, and glycosides (Table 1).

Phytoconstituents Ethyl acetate fraction
Alkaloids +
Glycosides +
Carbohydrates -
Steroids -
Triterpenes -
Saponins +
Tannins +
Proteins and amino acids -
Flavanoids +

Table 1: Phytochemical constituents of Stereospermum suaveolens bark. Note: + and - symbol represent presence and absence of phytoconstituent respectively

Acute toxicity study

No mortality and no toxic manifestations were observed up to a dose of 2000 mg/kg. Further dosing was not performed to estimate the LD50 (Lethal Dose) value. According to the OECD guidelines for acute toxicity, an LD50 dose of 2000 mg/kg and above is categorized as unclassified; hence, the drug is found to be safe. Based on the acute toxicity studies, doses of 200 and 400 mg/kg for the ethyl-acetate fraction have been selected as therapeutic doses.

Effect on serum and urine renal function parameters

Oral administration of a dose of 200 and 400 mg/kg of the ethyl acetate fraction of EESS to STZ-induced diabetic rats significantly (P<0.001) reduced the elevated fasting blood glucose levels, when compared to diabetic control rats. The changes in the level of serum urea, uric acid, creatinine and total protein, and urine total protein and albumin in non-diabetic control, STZ-induced diabetic control and fractions treated rats were illustrated in Table 2. Compared to the non-diabetic control rats, urea, creatinine and total proteins levels increased significantly (P<0.001), in STZ-induced diabetic control rats. Treatment of STZ-induced diabetic rats with ethyl acetate fractions of EESS for 14 days resulted in marked decrease in serum urea, creatinine (P<0.001, respectively) as compared to diabetic control rats.

Groups Urea (mg/dl) Uric acid (mg/dl) Serum creatinine (mg/dl) Serum total protein (g/dl) Urine total protein (mg/dl) Urine albumin (mg/dl) Serum glucose levels (mg/dl)
1st day 15th day  
Nondiabetic control
(5% DMSO in 0.9% NaCl, 5 ml/kg)
24.38±2.15 2.92±0.15 0.73±0.06 7.14±0.23 14.68±0.89 2.30±0.13 85.64±1.99 86.60±1.91
STZinduced diabetic control(5% DMSO in 0.9% NaCl, 5 ml/kg)) 61.73±1.72a,** 3.99±2.15   a,** 1.96±0.13 a,** 3.26±0.45 a,** 33.91±1.68 a,** 14.02±0.98 a,** 290.65±1.86a,** 293.40±2.42a,**
STZ+Ethyl acetate fraction(200 mg/kg) 36.53±1.51 b,** 3.12±0.12 b,** 0.81±0.12b,** 5.94±0.45  b,** 20.04±1.09  b,** 6.70±0.46 b,** 284.81±1.96b,** 145.42±1.99b,**
STZ+Ethyl acetate fraction (400 mg/kg) 29.50±1.38 b,** 3.09±0.12 b,** 0.72±0.05b,** 6.52±0.35 b,** 17.40±0.57 b,** 4.51±0.33  b,** 283.28±1.16b,** 124.12±1.13b,**
STZ+Glibenclamide(0.5 mg/kg) 30.25±1.27  b,** 3.04±0.12  b,** 0.80±0.24 b,** 6.61±0.36 b,** 18.24±0.79  b,** 6.40±0.22 b,** 286.50±6.35 b,** 115±6.11b,**

Table 2: Effect of ethyl acetate fractions of Stereospermum suaveolens on serum and urine renal biomarkers. Values are mean ± SEM; six rats in each group; a,**P<0.001 as compared to nondiabetic control group; b,**P<0.001 when compared with STZtreated control group; DMSO: Dimethylsulfoxide; STZ: Streptozotocin

Effects on renal in vivo antioxidant activities

Lipid peroxidation

STZ-induced diabetic rats show an increased TBARS (Thiobarbituric Acid Reactive Substances) level in kidney (Table 3) as compared to nondiabetic rats. However, treatment with ethyl acetate fractions significantly (P<0.001) decreased TBARS in diabetic rats as compared to respective diabetic control rats.

Groups Lipid peroxidation (nmol of MDA/mg protein) Glutathione (µM/gm protein) Superoxide dismutase (IU/mg protein) Catalase (nmol of H2O2 decomposed/min/mg protein)
Nondiabetic control (5% DMSO in 0.9% NaCl, 5 ml/kg) 9.36±0.72 31.79±0.77 20.63±1.21 53.45±1.20
STZinduced diabetic control (5% DMSO in 0.9% NaCl, 5 ml/kg) 23.92±1.81 a,** 17.26±0.37 a,** 8.95±0.18 a,** 22.31±1.19 a,**
STZ+Ethyl acetate fraction (200 mg/kg) 18.92±0.52b,** 24.07±1.22b,** 14.25±0.12b,** 35.50±1.26b,**
STZ+Ethyl acetate fraction (400 mg/kg) 13.28±0.65 b,** 28.83±0.49 b,** 17.23±0.33 b,** 41.94±1.10 b,**
STZ+Glibenclamide (0.5 mg/kg) 19.33± 0.92 b,** 22.73±0.41 b,** 15.42±0.34 b,** 34.08±0.97 b,**

Table 3: Effect of ethyl acetate fractions of Stereospermum suaveolens on kidney antioxidants. Values are mean ± SEM; six rats in each group; a,**P<0.001 as compared to nondiabetic control group; b,**P<0.001 when compared with STZtreated control group; DMSO: Dimethylsulfoxide; STZ: Streptozotocin; MDA: Malondialdehyde

Reduced glutathione content

The total GSH content decreased in STZ-induced diabetic rats as compared to non-diabetic rats. Treatment with ethyl acetate fractions significantly (P<0.001) increased total GSH in kidney when compared to STZ-induced diabetic control rats and is shown in Table 3.

Superoxide dismutase and catalase

SOD and Catalase (CAT) activities in the STZ-induced diabetic rats were significantly (P<0.001) decreased in kidney. Administration of ethyl acetate fractions significantly (P<0.001) increased the SOD and CAT activities compared to STZ-induced diabetic rats and is shown in Table 3.

Histopathalogical studies of kidney

Figure 1 shows kidney section of nondiabetic control rats with normal Glomeruli (GL), intact Bowman’s Capsule (BM), Proximal Convoluted (CT) and Distal Convoluted (DT) tubules. In STZ-induced diabetic control kidney (Figure 2) resulted in glomerular hypertrophy, mild thickening of basement membrane, increased Bowman’s space, tubular dilation, and interstitial inflammatory cell infiltration. Treatment with ethyl acetate fractions (200 and 400 mg/kg and glibenclaimde (0.5 m/kg (Figures 3-5) reduced cell infiltration, reduced tubular necrosis, show normal Bowman’s space with glomerulus, basement membrane and capillaries, and maintaining near normal kidney architecture.

clinical-experimental-pharmacology-Glomeruli

Figure 1: A sectional representation of normal rat kidney at x400 magnification (Haematoxylin and Eosin stain) showing normal Glomeruli (GL) with an intact Bowman’s capsule (BM), Proximal convoluted (CT) and Distal convoluted (DT) tubules.

clinical-experimental-pharmacology-glomerular

Figure 2: A representative section of STZ diabetic control rat kidney at x400 magnification (Haematoxylin and Eosin) showing severe glomerular degeneration, mild change density of mesenchyme, thickening of the basement membrane, proximal convoluted tubular degeneration, obliterated distal convoluted tubular lumen increased Bowman’s space, interstitial inflammatory cell infiltration and tubular dilation.

clinical-experimental-pharmacology-rat-kidney

Figure 3: A representative section of 200 mg/kg/day ethyl acetate fraction treated, STZ diabetic rat kidney at x400 magnification (Haematoxylin and Eosin) showing moderate tubular degeneration with mild glomerular degeneration and mild increased Bowman’s space.

clinical-experimental-pharmacology-convoluted

Figure 4: A sectional representation of 400 mg/kg/day ethyl acetate fraction treated, STZ diabetic rat kidney at x400 magnification (Haematoxylin and Eosin) showing normal glomeruli encapsulated in normal Bowman’s capsule. There is mild tubular degeneration interposed with normal proximal convoluted tubule and distal convoluted tubule.

clinical-experimental-pharmacology-Glibenclamide

Figure 5: A sectional representation of 0.5 mg/kg/day Glibenclamide treated, STZ diabetic rat kidney at x400 magnification (Haematoxylin and Eosin) showing normal glomeruli encapsulated by normal Bowman’s capsule.

Discussion

In people with diabetes mellitus, the diabetic nephropathy is the most important cause of death, of whom, 30-40% eventually develop end-stage renal failure [21]. A number of clinical studies suggest that the antioxidants in plants are key factors in reducing the incidence of diabetic nephropathy [22,23]. Finding new natural sources of antioxidants with potential antidiabetic activity can be useful to future therapy against diabetic mellitus and its complications.

The present study was conducted to evaluate the nephroprotective effect of ethyl acetate fraction of Stereospermumsuavelolens in STZ Diabetes mellitus rats. Experimental diabetes mellitus was induced in rats by injecting STZ, which is probably due to the destruction of ß-cells of pancreas [24]. Several studies reported that STZ administration elevated serum renal markers in rats [25,26]which is the indicator of diabetic nephropathy with altered glomerular filtration rate. The current study also revealed that serum renal markers such as creatinine, urea, uric acid and total proteins levels were increased and urine total proteins and albumin levels were decreased in diabetic control rats. The daily administration of ethyl acetate fraction of Stereospermumsuavelolens for 14 days caused a signi?cant reduction in serum creatinine, serum urea, urine total protein and urine albumin levels, and a significant elevation in serum total protein levels in diabetic rats when compared to diabetic control. This data indicates that the ethyl acetate fraction improved the renal functions and reversed the damage in the kidney tissues of diabetic rats.

Moreover, it has been reported that in STZ-induced diabetic rats, the renal undergo pathological changes [27,28] and the important pathologic features of diabetic nephropathy are glomerular hypertrophy, tubular dilation, interstitial inflammatory cell infiltration, mild thickening of basement membrane along with mild changes in the density of mesenchyme with increased Bowman’s space, and tubulointerstitial fibrosis [29]. These diabetic nephropathic changes were also observed in our study, in the STZ diabetic control rats. Treatment with ethyl acetate fractions (200 and 400 mg/kg and glibenclaimde (0.5 m/kg (Figures 3-5) reduced cell infiltration, improved tubular necrosis, show normal Bowman’s space with glomerulus, basement membrane and capillaries, and maintaining near normal kidney architecture. In diabetes mellitus, hyperglycemia increases the generation of free radicals by glucose auto-oxidation and the increment of free radicals may lead to kidney cells damage [30]. Ethyl acetate fraction treated rats proved that the kidney cells damage might be protected by their potent antioxidant property.

In diabetic nephropathy, oxidative stress has been found to be mainly due to an increased production of reactive oxygen species and a sharp reduction of antioxidant defenses [31].

Lipid peroxidation appears to be a key element in the production of nephropathy in diabetes [32,33]. One of the most often used biomarker to investigate the oxidative damage on kidney is TBARS (MDA) a major lipid peroxidation product. It can react with the free amino group of proteins, phospholipids, and nucleic acids leading to structural modification [34]. In the present study, the oral administration of ethyl acetate fraction to the STZ diabetic rats significantly (P<0.001) reverted back Malonyldialdhyde (MDA) levels to near normal values which suggests that ethyl acetate fraction of EESS might protect the kidney tissue from lipid peroxidation.

Furthermore, enhanced oxidative stress due to diabetes may also result from a dysfunction in the defense system against free radicals, such as reduction in glutathione or inactivation of SOD and CAT [35].

Glutathione, a major intracellular non protein sulphydral compound, has an important role in the generation of cellular redox state and, consequently, the imbalance in reduced GSH to oxidized glutathione ratio is a putative indicator of cellular oxidative stress [35,36]. The GSH levels were significantly (P<0.001) decreased in the kidney of diabetic control rats. Treatment with ethyl acetate fraction improved the reduced GSH level as compared to that in STZ diabetic control rats, suggesting strengthening of antioxidant defenses in kidney. Hence, the elevated level of GSH protects cellular proteins against oxidation through glutathione redox cycle and also directly detoxifies reactive oxygen species generated from exposure to STZ [37].

SOD and CAT are antioxidant enzymes that destroy the peroxides and play a significant role in providing antioxidant defenses to an organism. SOD acts to dismutate superoxide radicals to hydrogen peroxides which is then acted upon by GPx and CAT is a hemeprotein which catalyses the reduction of hydrogen peroxides and protects the tissues from highly reactive hydroxyl radicals [38]. Therefore, reduction in the activity of these enzymes (SOD, CAT) may result in a number of deleterious effects due to the accumulation of superoxide anion radicals and hydrogen peroxide [39].

In the present study the activities of SOD and CAT in kidney tissue extracts of the STZ-diabetic rats were significantly lower than their control ones. Some of the authors also reported decreased levels of these antioxidant enzymes (SOD, CAT) in kidney of diabetic rats [40,41]. These antioxidant enzymes SOD and CAT levels significantly increased after the treatment of ethyl acetate fraction of Ethanol Extract of Stereospermumsuaveolens (EESS) in STZ-induced diabetic rats indicating the free radical scavenging activity and their protective effect against diabetic kidney cellular damage.

The above in vivo antioxidant status reveals support to neproprotective effect of ethyl acetate fraction in diabetic rats, which also supports to histopathological studies. The oral treatments with ethyl acetate fraction ameliorated renal histological lesions in diabetic rats.

Moreover, the preliminary phytochemical investigation of the ethyl acetate fraction of Stereospermumsuaveolens revealed the presence of natural antioxidants as flavonoids, tannins, terpenoids and saponins. These phytochemicals have been reported to exhibit a major role in reducing oxidative stress associated with diabetes, which in turn helps in the regulation of normal kidney functions [42]. Antioxidants may have a role in the prevention of nephrotoxicity in diabetes [43]. Thus, the significant antioxidant activity of ethyl acetate fraction of against STZ induced kidney damage in diabetic rats may be attributed to the presence of screened natural antioxidants in the plant Stereospermumsuaveolens.

Conclusion

The present investigation clearly indicates that ethyl acetate fraction of ethanol extract of Stereospermumsuaveolens exhibits nephroprotective effect in addition to antioxidant effects in STZ-induced diabetic rats. Further study on ethyl acetate fraction of Stereospermumsuaveolens should be extended for the isolation and structure determination of the beneficial effect on renal function principle(s).

Acknowledgments

The authors would like to express thanks to the Principal, Al Shifa College of Pharmacy, Perinthalmanna, Kerala, for providing necessary facilities.

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