A method is described for quantitative analysis of bile acids in urine. Urine is acidified and bile acids are extracted on an Amberlite XAD-2 column. Bile salts are converted to acids on an Amberlyst A-15 column and are separated into groups of unconjugated, glycine, taurine, monosulfated, and polysulfated conjugates using the lipophilic anion exchanger diethylaminohydroxypropyl Sephadex LH-20 ...

3,4-Dihydropyrimidin-2(1H)-ones were synthesised in high yields by one-pot three-component Biginelli condensation in the presence of room temperature ionic liquids such as 1-n-butyl-3-methylimidazolium tetrafluoroborate (BMImBF4) or hexafluorophosphorate (BMImPF6) as catalysts under solvent-free and neutral conditions. © 2001 Elsevier Science Ltd. All rights reserved. Recently, the interest in ...

A B S T R C TSulfonated polyvinyl alcohol (PVA) can be used as a heterogeneous catalyst in esterification or transesterification reactions during methyl ester production. This with PVA support has the potential to commercially like Amberlyst 46. However, there are several drawbacks conventional methods produce sulfonated compared In this paper, various processes of synthesis will discussed incl...

The current transition to a sustainable source of chemicals and energy is being driven by political, economic, and environmental concerns associated with petroleum-derived feed stocks. In this context, the conversion of lignocellulosic biomass, a renewable resource, into platform molecules and fuels has received increasing interest. In order for biomass to effectively contribute to reducing our...