• Title, Summary, Keyword: mild acid-treated maize starch

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Enzyme-Resistant Starch Formation from Mild Acid-Treated Maize Starches (약산처리 옥수수전분으로 호소저항전분의 생성)

  • Lee, Shin-Kyung;Mun, Sae-Hun;Shin, Mal-Shick
    • Korean Journal of Food Science and Technology
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    • v.29 no.6
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    • pp.1309-1315
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    • 1997
  • Yields of enzyme-resistant starch (RS) from three kinds of maize starches (Amioca, normal starch and Amylomaize VII) which were treated with 1 N HCl for 24 hr and physicochemical characteristics were investigated. Hydrolysis rate of maize starches decreased with increasing amylose content. Maximum wavelength $({\lambda}_{max})$ and iodine affinity were decreased by the acid treatment. The yields of RS increased with acid treatment up to 12 hr and then decreased. The yield of for 12 hr acid-treated Amioca increased 8 times more than untreated sample, but those of normal starch and Amylomaize VII slightly increased. Using SEM, acid-treated and autoclaved maize starches showed gel like structure, but RS had round and rod shape small particles. X-ray diffraction patterns of autoclaved starches showed amorphous structure in Amioca and B-type in normal starch and Amylomaize VII, and those of RS showed all completely crystalline structure.

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The Effect of Mild-Acid Treated Waxy Starches on the Yield of Resistant Starch (약산 처리가 찰전분의 저항전분수율에 미치는 영향)

  • 이신경;홍윤호;신말식
    • Korean journal of food and cookery science
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    • v.15 no.4
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    • pp.418-425
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    • 1999
  • The characteristics and yield of resistnat starch (RS) in waxy starches which were treated with 0.1N HCl were investigated. Hydrolysis rate of waxy starches were 0.32-0.88%. The yields of RS in waxy maize and waxy barley starches increased with acid treatment time up to 12hr and then decreased. The yield of RS in waxy rice starches increased with acid treatment up to 8hr and then decreased. The hydrolysis and yield of RS were different depending upon the varieties of starch source. Autoclaved normal maize starch showed a gel-like structure, but autoclaved normal maize starch showed crystal particle on the surface by SEM. The shape of autoclaved resistant starch was not different from acid treated ones. X-ray diffraction patterns of native and acid treated starches were all A-types. X-ray diffraction patterns of autoclaved waxy maize starches showed amorphous structures, however, those of RS showed all completely crystalline structure.

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