Succeeded starch nanocrystals preparation combining heat-moisture treatment with acid hydrolysis

Limin Dai; Jun Zhang; Fang Cheng

doi:10.1016/j.foodchem.2018.11.018

Succeeded starch nanocrystals preparation combining heat-moisture treatment with acid hydrolysis

Food Chem. 2019 Apr 25:278:350-356. doi: 10.1016/j.foodchem.2018.11.018. Epub 2018 Nov 2.

Authors

Limin Dai¹, Jun Zhang¹, Fang Cheng²

Affiliations

¹ College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, PR China.
² College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, PR China. Electronic address: fcheng@zju.edu.cn.

PMID: 30583382
DOI: 10.1016/j.foodchem.2018.11.018

Abstract

Heat-moisture treatment (HMT) could be applied to increase the relative crystallinity (RC) of raw waxy maize starch (WMS) and mar the dense surface of starch granules. The optimal HMT conditions including temperature, treatment time, and moisture content were determined by response surface methodology (RSM). When the temperature, treatment time, and moisture content were 99.2 °C, 1.8 h, and 18.2%, respectively, the maximum RC of heat-moisture treated starch (HMTS) could reach to 42.44% and more holes, depressions, and cracks appeared on the surface of HMTS. Afterwards, HMTS was subjected to acid hydrolysis to prepare starch nanocrystals (SNCs). It was confirmed that SNCs could be successfully obtained with a hydrolysis time of 4 days and a yield of 26.7%. The results revealed that this method was more effective than conventional sulfuric acid hydrolysis method with a hydrolysis time of 5 days and a yield of 15.7%.

Keywords: Acid hydrolysis; Heat-moisture treatment; Relative crystallinity; Starch nanocrystals; Yield.

MeSH terms

Acids / chemistry
Crystallization
Hot Temperature
Hydrolysis
Microscopy, Atomic Force
Nanoparticles / chemistry*
Particle Size
Starch / chemistry*
Water / chemistry
Zea mays / metabolism*

Substances

Acids
Water
Starch