Study on influence of process parameters during malting on protein solubility

Abstract

U radu je ispitivan utjecaj postupka slađenja pri proizvodnji svijetlog pšeničnog slada na udio topljivog N u sladu, odnos ukupnog N i topljivog N (Kolbachov indeks). Ispitivani su uzorci osam domaćih pšenica kvalitativne grupe B (krušarice) koje karakterizira povišen udio ukupnog N u zrnu. Uzorci su uzimani tijekom dvije sezone (2008 i 2009). Provedeno je pet postupaka slađenja i to: (A) standardni postupak (kontrola); (B) restriktivni postupak s jakim porastom temperature tijekom klijanja; (C) intenzivni postupak s jakim padom temperatura tijekom klijanja; (D) umjereno intenzivni postupak s blagim padom temperatura tijekom klijanja; (E) umjereno restriktivni postupak s blagim porastom temperatura tijekom klijanja. Rezultati pokazuju da umjereno restriktivni postupak slađenja (E) daje najbolje rezultate kako za topljivi N u sladovini tako i za odnos ukupnog N i topljivog N (Kolbachov indeks).The aim of this work was to conduct influence of malting during light wheat malt production on share of soluble N in malt, and total N and soluble N (Kolbach index) ratio. Eight domestic wheat varieties of quality group B were conducted. They are characterized by increased share of total N in grain. Samples were taken during two seasons (2008 and 2009). Five malting procedures were conducted: standard procedure (A, control), restrictive procedure with high temperature increase during germination (B), intense procedure with high temperature decrease during germination (C), moderately intense procedure with moderate temperature decrease during germination (D), moderately restrictive procedure with moderate temperature increase during germination (E). Results show that procedure E gives best results for soluble N in worth and also for total N/soluble N ratio (Kolbach index)