Abstract

SALCEDO-MENDOZA, Jairo; PATERNINA-URZOLA, Sergio; LUJAN-RHENALS, Deivis  and  FIGUEROA-FLOREZ, Jorge. Enzymatic modification of cassava starch (Corpoica M-Tai) around the pasting temperature. Dyna rev.fac.nac.minas [online]. 2018, vol.85, n.204, pp.223-230. ISSN 0012-7353.  https://doi.org/10.15446/dyna.v85n204.66620.

Cassava starch variety Corpoica - TAI, was modified with a commercial α-amylase, in order to evaluate the effects of temperature, reaction time and enzyme/substrate (E/S) ratio on the degree of hydrolysis, and production of enzymatic modified starches. The modified starches presented dextrose equivalents (DE) ranging between 13 and 92%, yield (Y) between 0 and 45.5%. The Scanning electron microscope (SEM) analysis showed that the granules suffered exo-corrosion in agreement with the degree of hydrolysis. The crystallinity degree increased following modification. The granule morphology of hydrolyzed starch was different compared to the native starch. The gelatinization temperature in the residues of hydrolyzed cassava starches hydrolyzed increased with the crystallinity degree as well with the reduction in the amylose content. The native starch showed a greater setback and amylose values than hydrolyzed starches, which indicates that it is more susceptible to retrogradation or water lost (syneresis).

Keywords : α-amylase; granule; crystallinity; hydrolyzed starches.

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