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Amylolysis of maize mutant starches described with a fractal-like kinetics model.

Abstract : 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 α-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 over time. 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.
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Submitted on : Wednesday, May 27, 2020 - 12:45:57 PM
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Kamal Kansou, Alain Buleon, Catherine Gérard, Agnès Rolland-Sabaté. Amylolysis of maize mutant starches described with a fractal-like kinetics model.. Carbohydrate Polymers, Elsevier, 2015, 123, pp.266-274. ⟨10.1016/j.carbpol.2015.01.052⟩. ⟨hal-02633436⟩



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