Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Amino Acid Composition of Milled and Brown Rices

현미와 백미의 품종간 아미노산 조성

  • Published : 2003.12.01
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Abstract

The objectives of this study were to analyze amino acid composition of brown and milled rice of five varieties (Kwngan, Daean, Daejin, Sura, Hwaseong) and to evaluate their protein quality by several chemical scores. The protein contents of brown rice ranged from 6.7 to 8.0% and those of milled rice ranged from 6.1 to 7.5%. Daejin showed the highest protein contents in brown and milled rice among five rice varieties. Glx (glutamate + glutamine), Asx (asparagine + aspartic acid), arginine, leucine and valine were dominant amino acids in brown and milled rices and the most limiting amino acid was lysine. Ratios of essential amino acids to total amino acids were 36.8∼38.3% in brown rice and 35.8∼37.7% in milled rice. Protein scores were 76.4 to 79.6 in brown rices and 66.9 to 77.9 in milled rices, respectively. Chemical scores ranged from 60.7 to 63.2 in brown rices and from 55.5 to 62.4 in milled rices, respectively. The first limiting amino acid was lysine, the second threonine, and the third isoleucine in chemical scores.

본 연구는 표준 경작법으로 재배한 육성 품종 5종(광안, 대안, 대진, 수라, 화성)의 현미와 백미의 품종간 단백질과 아미노산 함량을 분석하고, 단백질의 화학적 질적 가치를 알아보고자 하였다. 단백질 함량은 현미에서는 대진벼(7.98%)>대안벼ㆍ화성벼(7.46%)>수라벼 (7.03%)>광안벼(6.70%) 순이었고, 백미에서는 대진벼(7.52%)>대안벼(6.90%)>화성벼(6.78%)>수라벼(6.64%)>광안벼(6.08%) 순으로 대진벼가 단백질 함량이 다른 품종에 비하여 가장 높았다. 총 아미노산에 대한 총 필수아미노산의 비율을 보면, 현미는 36.8∼38.3%이었으며, 백미는 35.8∼37.7%으로 화성벼가 가장 높았고, 대안벼가 가장 낮았다. 쌀의 모든 품종에서 가장 많이 함유된 아미노산인 Glx(glutamate+glutamine)은 현미에서 900.5∼965.9 mg/g N, 백미에서 1003.3∼1058.5 mg/g N으로 분석되었다. 현미와 백미의 아미노산 함량은 Glx>Asx>arginine>leucine>valine순이었다. A/E비 화학가는 현미에서 수라벼>화성벼>대진벼>대안벼>광안벼 순이었고, 백미에서 수라벼>광안벼>대안벼>대진벼>화성벼 순이었다. A/T비 화학가는 현미에서는 화성벼>대진벼>수라벼ㆍ광안벼>대안벼 순이었고, 백미에서는 광안벼>대진벼>수라벼>화성벼>대안벼 순이었으며, 제 1제한 아미노산은 lysine으로 판정 되었다. Protein score와 amino acid score에서 제 1제 한 아미노산은 lysine이었고, 제 2제 한 아미노산은 threonine, 그리고 제 3제한 아미노산은 isoleucine이었다.

Keywords

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