Posted by admin on Jun 1, 2014 in |
The present study was aimed to investigate the phytochemical compounds and antioxidant activity of acetone extract of Manilkara zapota L. seeds. Preliminary phytochemical screening was carried out with the solvents of different polarities and among them acetone extract was selected for further studies. The antioxidant activity of the acetone extract was evaluated by seven different in vitro methods namely: DPPH, FTC, TBA, Metal chelation assay, hydroxyl radical scavenging activity, phosphomolybdenum assay, FRAP. Among them, the acetone extract showed good DPPH radical scavenging activity; IC50 value 380 μg /ml and was compared to the standard α-tocopherol. The amount of lipid peroxidation was high in initial stages when compared to the later stages when assessed using FTC and TBA assay. The seed extract did not show good hydroxyl radical scavenging activity when compared to the other antioxidant evaluation techniques. In conclusion, the results presented here imply that Manilkara zapota seeds could be considered as nutraceutical/functional...
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Posted by admin on Jun 1, 2014 in |
N- nitrosodiethylamine (NDEA), a chemical carcinogen widely used to initiate hepatocarcinogenesis in rats. Food stuffs such as milk and meat products, salted fish, alcoholic beverages and a few varieties of vegetables are the principal sources of nitroso compounds. NDEA has been suggested to cause oxidative stress and cellular injury due to the enhanced formation of free radicals. The present study was designed to evaluate the preventive effect of the methanolic extract of Leucas aspera (MELA) against NDEA induced subacute liver injury in male Wistar rats. NDEA was administered for 4 weeks. MELA at 100 and 200mg doses and standard drug; silymarin at a dose of 50 mg/kg body weight were administered one week before the onset of NDEA intoxication and continued for 4 weeks. Significant increase in the activities of superoxide dismutase, catalase, reduced glutathione and total protein were observed in the drug treated groups. Rats intoxicated with NDEA showed elevated levels of serum aspartate aminotransferase (AST), alanine aminotransferase (ALT), γ-glutamyl transpeptidase (γ-GGT) and tissue lipid peroxides (TBARS &...
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Posted by admin on May 1, 2014 in |
The main objective of this work is to study the stereostructures and biological activity of some highly substituted cyclohexenes, cyclohexanols and the intermediates there in. In order to get the desired cyclohexenes, the synthesis of cyclohexanols 2,4-bis(4-chlorobenzoyl)-1-(4-chlorophenyl)-3,5-bis(4-methoxyphenyl)-and 2,4-bis(4-chlorobenzoyl)-1,3,5-tris(4-chlorophenyl)-cyclohexan-1-ols (1b and 2b) from 4’- chloro-4-methoxy- and 4,4’- dichlorochalcones(1 and 2) via 1,5-bis(4-chlorophenyl)-3-(4-methoxyphenyl)- and 1,3,5-tris(4-chlorophenyl)-pentan-1,5-diones(1a and 2a ) using p-chloroacetophenone in the presence of sodium hydroxide(molar ratio, 2:1:10) is first described. These are then dehydrated with p-TsOH which afford typical cyclohexenes, 4,6-bis(4-chlorobenzoyl) -1- (4-chlorophenyl) – 3,5 –bis (4-methoxyphenyl) and 4,6 –bis(4-chlorobenzoyl)-1,3,5 –tris (4-chlorophenyl) –cyclohex-1-enes (1c) and (2c) in quantitative yields containing β,γ-unconjugated double bond following stereoselective syn elimination. Also, in an attempt to synthesize dithiazolidin-4-one (3), the reaction of 1, 5-dione (1a) with mercapto acetic acid and ammonium carbonate is adopted. However, it fails to produce (3) and only a pyridine derivative, 2, 6-bis (4-chlorophenyl)-4-(4-methoxyphenyl) pyridine (4) is obtained.in 87% yield. Structural assignment, stereochemistry and biological assays are discussed. The characterization is done by modern spectroscopic...
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Posted by admin on May 1, 2014 in |
The present work is aimed to formulate Itopride HCl sustained release pelletsusing ethyl cellulose N50 such ashydrophobic polymer by employing the solution/suspension layer technique. The drug excipients compatibility study was carried out by Furor Transform Infrared spectroscopy (FTIR) which reveals no interaction between drug and excipients. Total 12 batches were formulated. Six formulations were prepared by using each natural polymer like ethyl cellulose N50. All the formulations were evaluated for micromeritic properties, physical evaluation, which includes particle size analysis, percentage yield, drug content, drug entrapment efficacy, percent moisture loss and swelling index, in vitro dissolution studies, scanning electron microscopy, and drug polymer interaction studies. The formulated pellets were evaluated for various pellet properties, like hardness, bulk density, tapped density, cars index and dissolution rate. Comparative evaluation of the above-mentioned parameters established the superiority of the pellets formulated with Ethyl cellulose those formulated with different grades. The Optimized batch F3 was found to release the drug for 12 h (96.46%) and follows Higuchi Matrix model in dissolution studies, indicating the...
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Posted by admin on May 1, 2014 in |
Sustained release matrix tablets reduce the frequency of the dosing and increase the effectiveness of the drug by localization at the site of action, providing uniform drug delivery. Sustained release matrix tablets of verapamil hydrochloride were prepared by using HPMC K15M, Xanthan and Guar Gum polymers with different concentration in various batches of the formulations to facilitate the drug release which cause patient compliance as the dosing frequency is reduced. Verapamil HCl was considered as an ideal drug for designing sustained release formulation because of the high frequency of administration and short biological half-life. The sustained release matrices of Verapamil HCl were prepared by wet granulation technique. Drug release was studied by using Dissolution testing apparatus 2 (paddle method) with 0.1 N HCl buffer for 2 hours followed by pH 6.8 Phosphate buffer for 8 hours. The in vitro drug release of various formulations was performed and compared. The results shows that the tablets formulated with HPMC K15M polymer shows more sustained action when compared to that of Xanthan...
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