Storage Protein and Amino Acid Composition Analysis and Nutrition Evaluation of Relay-Cropped Soybean

Abstract

Abstract: Objective: To analyze the storage protein and amino acid composition and evaluate the nutritional value of three different relay-cropped soybean cultivars: Guixia No.3, Gongxuan No.1 and Zhongjiang Shiyuehuang. Methods: Soybean protein was determined using a near infrared grain analyzer, and amino acid composition was determined using an automatic amino acid analyzer. Results: The average content of relay-cropped soybean protein was 48.71%, and the relative contents of storage protein 7S and 11S were 24.94% and 67.57%, respectively. As far as the high-protein cultivar Zhongjiang Shiyuehuang was concerned, relay-cropped soybean had a storage protein 11S/7S ratio as high as 3.08, which was significantly increased by 0.19 (P = 0.001) compared with that of (2.89) of solo-cropped soybean. The average amino acid content in relay-cropped soybean was 37.3%, and the average ratio of essential to total amino acids was not less than 38%, close to or larger than that obtained from the FAO/WHO standard or the whole egg reference pattern. According to the FAO/WHO reference pattern, the amino acid score (AAS), chemical score (CS), essential amino acid index (EAAI), score of RCAA (SRCAA) of relay-cropped soybean were 64.34, 76.82, 82.10, 83.06 and 78.06, respectively, with variations of 2.38 (P = 0.002), 3.01 (P = 0.012), 0.03 (P = 0.209), 0.45 (P = 0.202) and －0.19 (P = 0.754) when compared with solo-cropping soybean. Conclusion: Relay-cropped soybean has the same or even higher nutritional value as solo-cropped soybean and more reasonable 11S/7S ratio which is good for the quality of soybean protein products. As a consequence, it is necessary to select highly nutritional soybean cultivars for relay-cropping with corn.

Key words: relay-cropping soybean, storage protein, amino acids, nutritional evaluation

CLC Number:

S565.1

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