Effect of heat-moisture treatment on the physicochemical properties of native canistel starch

Abstract

The modification process in starch can improve starch characteristics and expand its application into food products. The objective of this research was to study the effect of heat moisture treatment (HMT) modification on the properties of new canistel starch and study their potential application to food products. The research methods were isolating the native starch and modifying it using HMT modification. Pasting profile, moisture content, starch and amylose content, yield, color, granule morphology, and crystallinity properties of native and HMT canistel starches were analyzed. Statistical analysis showed that HMT modification increased the initial and peak temperatures of gelatinization, peak time, trough viscosity, final viscosity, and setback value. However, it decreased peak viscosity and breakdown levels. In addition, this modification significantly reduced the yield, brightness, and amylose content of canistel starch. HMT modification made a more tenuous structure than native starch, however it did not change spherical shape and small size of the granules. Also, HMT-modified canistel starch had higher crystallinity degree than native starch. Based on these obtained properties, native canistel starch was suitable for frozen food, whereas HMT starch can be applied in noodle processing and as a thickener.

Keywords:
Pouteria campechiana; gelatinization; modified starch; morphology structure; crystalline property