This study aimed to investigate the difference in amino acid content of different corn varieties, and evaluate the comprehensive quality of corn grain based on amino acid composition. The contents and compositions of amino acids in 22 corn varieties were determined by automatic amino acid analyzer. Besides, the corn protein was assessed by the amino acid score (AAS), chemical score (CS), essential amino acid index (EAAI), biological value (BV), the ratio of essential amino acids (EAARR), score of ratio co-efficient of amino acid (SRCAA), nutritional index(NI) and other chemical methods. The results showed that there were 16 kinds of amino acids in 22 kinds of corn. The contents of total amino acids and essential amino acids ranging from 65.32 g/100g to 79.50 g/100g, and 24.79 to 30.18 g/100g. The score of ratio coefficient of amino acid (SRCAA) ranging from 59.76-66.20. M753 showed the highest EAAI, BV and NI values, while Denghai 8883 had the highest EAARR value, and Xinyu 77 had the highest SRCAA. The nutritional evaluation of amino acids in different corn cultivars would be of certain indicative value to ensure full development of corn nutritional value and optimal utilization of different cultivars.
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