an efficient synthesis of some novel coumarin derivatives via 1, 4- michael addition of indole to coumarin chalcones catalyzed by cellulose sulphonic acid (csa) under solvent free conditions is described. the corresponding michael addition products were obtained in good to excellent yield. the synthesized compounds were screened for their antibacterial activity against e. coli, s. aureus and an...

An efficient synthesis of some novel coumarin derivatives via 1, 4- Michael addition of indole to coumarin chalcones catalyzed by cellulose sulphonic acid (CSA) under solvent free conditions is described. The corresponding Michael addition products were obtained in good to excellent yield. The synthesized compounds were screened for their antibacterial activity against E. coli, S. aureus and an...

An efficient synthesis of some novel coumarin derivatives via 1, 4- Michael addition of indole to coumarin chalcones catalyzed by cellulose sulphonic acid (CSA) under solvent free conditions is described. The corresponding Michael addition products were obtained in good to excellent yield. The synthesized compounds were screened for their antibacterial activity against E. coli, S. aureus and an...

Oligo(L-lactic acid) (OLLA) was synthesized by ring opening polymerization of L-lactides using stannous octoate (0.03 wt% lactide). While this served as the initiator, L-lactic acids were co-initiators at 140 °C for 10 h, wherein prepared hydrolytic degradation 100 1 h. The molecular weight or degree controlled with monomer/co-initiator ratio (mol/mol). α-cellulose and microcrystalline cellulos...

Brown-rot fungi, e.g. the dryrot fungus (Serpula lacrymans), are the most harmful microorganisms in wood in service in Finland and in temperate regions. Brownrot fungi cause wood decay primarly by attacking the carbohydrates of the cell walls, leaving lignin essentially undigested. At the initial stage of the decay, the brown-rot fungi seem to operate by a mechanism which cause extensive change...

Carbon-based solid acids (CSA) have grown in popularity recent years owing to their strong catalytic activity, thermal stability, and reusability. The size effect has a significant influence on the activity of carbon-based heterogeneous catalysts. impacts raw material shape, sulfonation degree, produced were examined this article. Various sizes microcrystalline cellulose (MCC), nanocrystals (CN...

The effects of p-chloromercuribenzoic acid and chloromercuribenzene-p-sulphonic acid on pancreatic islets were studied in vitro. Obese-hyperglycaemic mice were used as the source of microdissected islets containing more than 90% beta-cells. p-Chloromercuribenzoic acid and chloromercuribenzene-p-sulphonic acid stimulated insulin release at concentrations of 0.01mm or above. This stimulation was ...

The objective of this study was to prepare carbonaceous catalysts. Taking cellulose as the starting material, functionalization with sulphuric acid done using 1:10 w/v ratio under one pot hydrothermal treatment at 80 °C. catalyst extensively characterized BET, XPS, TGA, SEM, FT-IR, XRD etc. synthesized C-SO3H had a surface area 447 m2g−1, pore radius 30.020 Å and volume 0.157 cc g−1. total acid...

Urinary and faecal excretion of radioactivity after either an intravenous or oral (1 mg/kg) dose of 35S-labelled Tobias acid (2-naphthylamino, 1-sulphonic acid), a dyestuff intermediate structurally similar to the powerful carcinogen 2-naphthylamine, was studied in rats. The Tobias acid was eliminated from the body within 24 hours of administration, almost exclusively through the urine. TLC-chr...

BACKGROUND Growing evidence suggests that intestinal recovery from injury induced by radiation, endotoxin, and protein deficiency is improved by the ingestion of nucleosides and nucleotides. AIM This study examined the effect of dietary nucleosides and nucleotides supplementation on trinitrobenzene sulphonic acid induced colonic damage in experimental colitis. METHODS Sprague-Dawley rats we...