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Effects of Physicochemical and Gel Properties of Starches Purified from Korean and Chinese Mungbeans with Different Methods

한국산과 중국산 녹두로부터 방법을 달리하여 분리한 전분의 이화학적 및 겔 특성에 미치는 영향

  • Qian, Yurun (Department of Food and Nutrition and Human Ecology Research Institute, Chonnam National University) ;
  • Shin, Malshick (Department of Food and Nutrition and Human Ecology Research Institute, Chonnam National University)
  • 전옥윤 (전남대학교 식품영양학과와 생활과학연구소) ;
  • 신말식 (전남대학교 식품영양학과와 생활과학연구소)
  • Published : 2012.12.31

Abstract

To compare the physicochemical and gel properties of mung bean starches prepared by different purification methods, starches from Korean Eohul variety and Chinese mung bean (MB) with or without hull using alkaline solution or water as solvent were purified. The optimum conditions for making muk were investigated. Apparent amylose and total dietary fiber contents, water binding capacity, solubility and pasting properties by RVA were analyzed. The characteristics of starch gels (10% dry basis) were measured for 0 and 4 day stored at $4^{\circ}C$. The protein and ash contents were significantly different (p<0.05) and lowered in starch from dehulled MB using alkaline solution. The starches from dehulled MB using alkaline solution showed the lowest color differences. Apparent amylose contents of Eohul and Chinese starches showed 37.06-39.03% and 31.57-32.74%, respectively. Chinese starch was higher in water binding capacity but lower in solubility at $85^{\circ}C$ than others. Peak, trough, cold, and breakdown viscosities of Eohul starch were higher than those of Chinese one. Mung bean starch gel made immediately exhibited clear and glossy appearance but became whiter like milk. The crystallinities of starch and starch gel showed A and B types, respectively. The hardness, gumminess, and resilience of starch gel made immediately and hardness, cohesiveness, gumminess, and resilience of 4 day stored gels were different significantly (p<0.05). Especially, Eohul starch gels purified from hulled MB showed higher resilience (bending property) and hardness. Therefore, it was suggested that high quality muk would be made using MB starch purified from hulled Korean mung bean using water as solvent.decreased in contain more than 20% of SGP added groups. The optimal concentration of SGP was found in the range of less than 10%.

Acknowledgement

Grant : 한식 우수성 기능성 연구

Supported by : 농림수산식품부

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