Kvasny Prum. 1976; 22(4): 73-76 | DOI: 10.18832/kp1976013

Effects of polyphenols upon analytic criteria evaluating quality of malt.Peer-reviewed article

H. VRTĚLOVÁ, A. DOLEŽALOVÁ

A series of experiments has been carried out to study the effects of albumen content, barley modification, variety of barley and soil and climatic conditions upon the content of polyphenols and tannoids. Tannoids-albumins relationship for barley was calculated by applying correlation calculus. Very significant correlation coefficients have been found for barley of several different harvest years. The content of polyphenols depends also on the content of albumins. During modification process tannoids are liberated and simultaneously some other analytic criteria are influenced, especially the Kolbach number and RE 45°C. Through steeping the content of polyphenols is reduced whereas sprouting has contrary effects. The final percentage is lower than in barley. What effects can be attributed to variety of barley and region of its origin, is difficult to trace, because of such factors as cultivating methods, content of albumins, modification process and harvest year. Our experiments provide basic information on polyphenols and their relationship to other quality criteria. The properties of barley varieties grown in Czechoslovakia are now better known.
(In Czech, English summary only)

Keywords: malt, analytic criteria, polyphenols

Published: April 1, 1976