期刊
CARBOHYDRATE POLYMERS
卷 123, 期 -, 页码 266-274出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2015.01.052
关键词
Starch mutant; Heterogeneous hydrolysis; First-order kinetics; Amylase; Maize
Two empirical models, a conventional first-order kinetics and a fractal-like first-order kinetic model were tested for analysing the hydrolysis of 13 wild type, single and double mutants of maize starch by porcine pancreatic a-amylase (PPA). The major difference between the two models is an additional parameter, the fractal kinetics exponent h, which enables to characterise a decrease of the reaction rate coefficient overtime. The fractal-like kinetic model should be preferred to characterise the amylolysis for 10 mutants out of 13 as sugary-2 and amylose-extender curves exhibit clear reaction rate retardation, unlike normal maize and waxy maize. Analysis of the model parameter values reveals two groups of kinetics for the maize mutants: amylose-extender, normal and waxy on one hand, sugary-2 on the other hand. Possible relations between the parameters of the model and granule composition and structure are discussed. (C) 2015 Elsevier Ltd. All rights reserved.
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