Polyphenols are biologically active
 compounds with antioxidant properties present in
 foods such as black tea, coffee, red wine and cocoa;
 its content depends on atmospheric conditions,
 cultivation, processing storage. The objective of
 this work was to determine the of polyphenols
 in beverages by two colorimetric methods
 establish a correlation antioxida...

A simple rapid, and economical procedure is presented for the quantitative determination of acetaminophen in serum. Acetaminophen is extracted into solvent, and, when back-extracted into base, is simultaneously reacted with Folin-Ciocalteau reagent to form a colored complex. The potential interference of bilirubin is eliminated by treatment with p-diazobenzene sulfonic acid. Results obtained wi...

Elastatinal1) is an elastase inhibitor which was found in culture filtrates of various species of actinomycetes. In this communication, its structural elucidation is reported. The properties of elastatinal have already been described in a previous papery. It has the molecular formula C21H36N8O7. The IR [1725. 1655 (broad) and 1550 (broad) cm-1] and UV [2 0.1N HCl max: 275 nm (E 1% 1cm, 1.5)] sp...

Because high intravenous and intrathecal doses of methotrexate are used in treatment for various neoplasms, this drug can reach high concentrations in cerebrospinal fluid. At those encountered clinically, it produced significant positive interference with values for cerebrospinal fluid protein as determined with the du Pont aca. A small interference was found with the Folin-Lowry method, and vi...

The manufacture of ethanol-free propolis solutions offers a broader application. A few trials with Lithuanian propolis have been conducted. The aims of the study are to manufacture propolis water and water-free solutions and evaluate the quality and antimicrobial activity of these solutions. The studied solutions containing 2.5%, 5%, and 10% propolis are prepared. As solvents, purified water, 7...

The genus Phoenix is one of the most widely cultivated groups of palms around the world. The aim of this study was to determine the antioxidant activity and total phenolic compounds of 14 different varieties of date palm (Phoenix dactylifera L., Arecaceae) seed extracts with 5 solvents [water, methanol, methanol (50%), DMSO, and water: methanol: acetone: formic acid (20:40:40:0.1)]. Ferric redu...