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Kaffircorn malting and brewing studies XIV. —Mashing with kaficorn malt: Factors affecting sugar production
Author(s) -
Novellie L.
Publication year - 1966
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740170805
Subject(s) - mashing , brewing , sugar , sorghum , chemistry , food science , starch , substrate (aquarium) , amylase , reducing sugar , agronomy , enzyme , biochemistry , biology , fermentation , ecology
The effects of temperature, time, pH, diastatic power, malt/grain ratio and nature of the substrate on the production of sugar by sorghum malts have been investigated. The optimum temperature for sugar production is 60°. Although sugar production decreases with increasing acidity of the mash, yields are still appreciable. sorghum malt being more active than barley malt under such conditions. With malts of diastatic powers up to 25 K.D.U./g the substrate is in excess; with diastatic powers of 45 K.D.U./g or greater, the amylases are in excess. The use of grain adjuncts permits the control of the enzyme/substrate ratio. The optimum malt/grain ratio lies between 1:3 and 1:2 at pH 6·3 and is a reflection of the ratio of ungelatinised to gelatinised starch and the affinity of the amylases for these two forms of the substrate.