CHEMICAL CONSTITUENTS OF NYLON-66 BEER ADSORBATE. I. PRELIMINARY INVESTIGATIONS AND ANTHOCYANOGEN CONTENTS

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Abstract
A short survey of the polyphenolic substances of interest in brewing research and practice is given and a simple but comprehensive classification of phenolics (“tannins”) is proposed. A preliminary investigation has been made of the chemical constituents of a Nylon-66 beer adsorbate from a Canadian ale. Different fractions were obtained from the Nylon resin beer adsorbate and its caustic desorbate by using various organic solvents for extraction; the extractive power and selectivity of different solvents are compared. The anthocyanogen content of various fractions was determined by five different methods, and the widely varying results obtained indicate the serious shortcomings of the methods at present available for anthocyanogen determination.