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This study aimed to compare the chemical and amino acid compositions of the breast meat of broiler and laying hens, which have low acceptance in the market. The breast meats were analyzed for the chemical and amino acid compositions of hydrolysates digested by protease at optimum reaction conditions using the amino acid analyzer. No significant differences in moisture and ash contents were detected between the two types of breast meat. However, there were significant differences in the crude lipid and protein contents of laying hen (1.01% and 23.68%, respectively) and broiler hen (1.54% and 25.41%, respectively) meat samples. The amino acid contents of the breast meat samples of the laying and broiler hens were as follows: aspartic acid (6.88% and 9.84%, respectively), leucine (2.01% and 2.99%, respectively), and arginine (0.97% and 1.32%, respectively). Furthermore, the broiler meat had higher contents of essential amino acids such as valine, methionine, isoleucine, leucine, and phenylalanine. The total essential amino acid contents of the two types of meat were 5.87% (laying) and 8.29% (broiler), while the branched chain amino acid contents were 2.97% (laying) and 4.60% (broiler). The result of this study suggests that the hydrolysate of broiler breast meat could possibly be utilized as functional ingredient for patient foods, elderly food, sports drink and condiment sources.
본 연구에서는 국내 닭고기 중 종계와 육계의 일반성분을 확인하고 가슴살 부위를 단백질 분해효소로 처리하여 아미노산 조성을 확인하였다. 용도가 제한된 닭가슴살의 활용도를 확대하기 위해 기호도를 높이고, 기능성 소재나 조미 혹은 스포츠음료로 사용하기 위한 기초자료를 제공하고자 하였다. 종계와 육계 가슴살의 일반성분을 분석한 결과, 수분 함량과 회분함량은 유의적인 차이를 보이지 않았지만, 조지방, 조단백질, 회분 함량은 유의적인 차이를 보였다. 조지방과 조단백질의 함량은 육계가 종계보다 높은 함량을 나타내었다(1.54 g/100 g, 25.41 g/100 g). 종계 및 육계의 가슴살을 단백질분해 효소로 가수분해한 분해물의 아미노산 특성을 분석한 결과 각각의 닭가슴살 아미노산은 총 28종이 검출되었으며, aspartic acid(6.88, 9.84%)가 가장 높은 함량을 나타내었고, 그 다음은 leucine(2.01, 2.99%), arginine(0.97, 1.32%)의 순이었다. 필수아미노산 중 valine, methionine, isoleucine, leucine, phenylalanine의 함량은 종계에 비해 육계가 높은 함량을 나타내었다. 필수아미노산 함량은 종계 5.87%, 육계 8.29%로 유의적인 차이를 보였으며, 근육형성에 영향을 미치는 분지아미노산의 함량도 종계 2.97%, 육계 4.60%로 차이가 있었다. 이 결과로 닭가슴살을 아미노산 보강소재와 조미 혹은 기능성소재로 사용 가능성이 있음을 확인하였다.
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