Phenols from defatted walnuts were extracted with absolute methanol. The phenols were divided into four groups on the basis of molecular size. The antagonism of each group towards Escherichia coli, Staphylococcus aureus, and Aspergillus flavus was determined. Small polymers were the best antagonists of E_„ coli and Staph. aureus followed...
Equal molar amounts of (+)-catechin and N-Hydroxymethylacetamide
were reacted under acidic conditions. Thin-layer
chromatography (TLC) was used to monitor the reaction.
The reaction products were isolated by column chromatography
using Sephadex LH-20 and elution with 95 percent ethanol.
Three reaction products isolated included one
disubstituted and two monosubstituted compounds. The...
A number of methods to isolate and quantify protein in Pinot noir wines were evaluated. The combination of precipitation by acetone containing 10% w/v trichloroacetic acid followed by quantification with the Bradford assay, reported in yeast invertase equivalents yielded the most accurate results when compared to micro-Kjeldahl analysis. The technique...