Effects of acid hydrolysis and defatting on crystallinity and pasting properties of freeze-thawed high amylose corn starch

Hyun Jung Chung, Hyo Young Jeong, Seung Taik Lim

Research output: Contribution to journalArticle

70 Citations (Scopus)

Abstract

Paste of defatted and/or mildly acid-hydrolyzed high amylose corn starch was freeze-thawed, and then the starch was isolated by vacuum drying for the analysis in crystallization and pasting properties. X-ray diffraction pattern and differential scanning calorimetric analysis showed that the crystallinity of the freeze-thawed starch was increased as the degree of hydrolysis increased. The diffraction pattern revealed B- and V-crystals with patterns with diffraction peaks at 17, 20, and 23-25° (2θ), which were developed by amylose recrystallization during the freeze-thawing. The crystal melting enthalpies, for dual endothermic transitions above 100 °C, which resulted from the melting of amylose-lipids complex and amylose double helices were raised by the treatment. The isolated and dried starch formed a paste by aqueous heating under the ambient pressure, and its paste viscogram exhibited substantially higher resistance to shear-thinning, and rapid setback upon cooling. Acid hydrolysis, however, reduced overall paste viscosity, possibly due to the increased crystallinity. Enzyme-resistant starch content in the acid hydrolyzed starch was increased by the freeze-thawing, but not by acid hydrolysis. It was slightly increased by defatting.

Original languageEnglish
Pages (from-to)449-455
Number of pages7
JournalCarbohydrate Polymers
Volume54
Issue number4
DOIs
Publication statusPublished - 2003 Dec 1

Fingerprint

defatting
Amylose
pasting properties
acid hydrolysis
corn starch
Starch
amylose
Zea mays
Hydrolysis
starch
Ointments
Acids
melting
thawing
crystals
Thawing
vacuum drying
Diffraction patterns
Freezing
resistant starch

Keywords

  • Acid hydrolysis
  • Freeze-thawing
  • High amylose corn starch
  • Resistant starch

ASJC Scopus subject areas

  • Food Science
  • Biochemistry

Cite this

Effects of acid hydrolysis and defatting on crystallinity and pasting properties of freeze-thawed high amylose corn starch. / Chung, Hyun Jung; Jeong, Hyo Young; Lim, Seung Taik.

In: Carbohydrate Polymers, Vol. 54, No. 4, 01.12.2003, p. 449-455.

Research output: Contribution to journalArticle

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