ABSTRACT
The present study was aimed at designing a microflora triggered colon targeted drug delivery system (MCDDS) based on swellable polysaccharide, Sterculia gum in combination with biodegradable polymers with a view to specifically deliver azathioprine in the colonic region for the treatment of IBD with reduced systemic toxicity. The microflora degradation properties of Sterculia gum was investigated in rat caecal phosphate buffer medium. The polysaccharide tablet cores were coated to different film thicknesses with blends of Eudragit RLPO and chitosan and overcoated with Eudragit L00 to provide acid and intestinal resistance. Swelling and drug release studies were carried out in simulated gastric fluid, SGF (pH 1.2), simulated intestinal fluid, SIF (pH 6.8) and simulated colonic fluid, SCF (pH 7.4 under anaerobic environment), respectively. Drug release study in SCF revealed that swelling force of the Sterculia gum could concurrently drive the drug out of the polysaccharide core due to the rupture of the chitosan/Eudargit coating in microflora activated environment. The degradation of chitosan was the rate-limiting factor for drug release in the colon. Drug release from the MCDDS was directly proportional to the concentration of the pore former (chitosan), but inversely related to the Eudragit RLPO coating thickness.
Subject(s)
Azathioprine/chemistry , Colon/metabolism , Polymers/chemistry , Polysaccharides/chemistry , Administration, Oral , Animals , Azathioprine/administration & dosage , Cecum/metabolism , Chemistry, Pharmaceutical/methods , Chitosan/chemistry , Drug Carriers/chemistry , Drug Delivery Systems/methods , Excipients/chemistry , Male , Polymers/administration & dosage , Polymethacrylic Acids/chemistry , Polysaccharides/administration & dosage , Rats , Rats, Wistar , Sterculia/chemistry , Tablets/chemistryABSTRACT
In the present study, selection of superdisintegrants among sodium starch glycolate, cross povidone, Starch-1500 and cross carmellose sodium (CCS) was carried out for development of immediate release nateglinide tablets (NTG). A 3(2) full factorial design was used to investigate the influence of two independent variables, i.e., amount of selected superdisintegrants and hardness of the tablets, on two dependent variables, i.e., disintegration time and percentage of drug release at 30 min (DR(0.5h)). The results revealed that CCS was the best superdisintegrant for the development of immediate release tablets of NTG. The sign of the coefficient of the polynomial equation signified that the disintegration time was decreased and DR(0.5h) was increased by decreasing the hardness of the tablets as well as by increasing the concentration of CCS in the tablets. A checkpoint batch of the tablets was prepared by changing the value of independent variables within the range used in the preparation of factorial batches of tablets to check the validity of the evolved optimized mathematical model. Stability studies of optimized formulations indicated that there was no significant change in the physical parameters, disintegration time, and percentage of drug release of tablets. The systematic formulation approach helped to understand the effect of formulation processing variables.
Subject(s)
Solubility , Tablets , Chemistry, Pharmaceutical , Excipients , Hardness , PovidoneABSTRACT
The plant Kaempferia rotunda Linn. has been explored for its anti oxidant potential in the present study. The antioxidant property was assessed by lipid peroxidation markers such as malonaldehyde (MDA) and 4-hydroxyl-2-nonenal (4-HNE). The lipid peroxidation byproducts are highly toxic and responsible for various diseases like myocardial infarction, diabetes mellitus, hepatic injury, atherosclerosis, rheumatoid arthritis and cancer. The chemical constituents of the plant were critically and qualitatively analyzed to confirm the presence of flavonoids and phenolic derivatives. Hence our objective has been designed to evaluate the antioxidant effect of Kaempferia rotunda linn. and its contribution to control the lipid peroxidation.
ABSTRACT
A sulphydryl plant protease present in the latex of Ficus hispida Linn affects hatematological values in mice. The isolated protease was found to increase clotting time and erythrocyte sedimentation rate while haemoglobin conten, RBC count and WBC count were decreased in a dose dependent manner. Ointment containing 1.0% (w/w) hispidain in washable ointment base showed good wound healing property in mice. The protease also possesses mild anti inflammatory activity.
ABSTRACT
A proteolytic enzyme, curcain, has been extracted from the latex of Jatropha curcas Linn. The enzyme was purified by chromatography on carboxymethyl cellulose and gel filtration on Sephadex G-200. The homogeneity of protein associated with curcain was established by non-denatured polyacrylamide gel electrophoresis using a discontinuous buffer system. The molecular weight of curcain was estimated by Sephadex G-100 gel filtration using a calibration curve of standard proteins to be around 22,000 daltons.
