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Protein Content and amino acid Composition in Grains of Wheat-Related Species

Agricultural Sciences in China 2008年第3期7卷 272-279页

作者： JIANG Xiao-ling TIAN Ji-chun HAO Zhi ZHANG Wei-dong State Key Laboratory of Crop Biology/Group of Quality Wheat Breeding Shandong Agricultural University Tai＇an 271018 P.R. China

The protein content and amino acid composition for 17 wheat-related species （WRS） and three common wheats （control） were determined and analyzed, and the essential amino acids （EAAs） in WRS were evaluated according to FAO/WHO amino acid recommendations. The results showed that the mean protein content for WRS was 16.67%, which was 23.21% higher than that for the control. The mean contents （g 100 g^-1 protein） of most amino acids for WRS were lysine 2.74%, threonine 2.83%, phenylalanine 4.17%, isoleucine 3.42%, valine 3.90%, histidine 2.81%, glutamic acid 29.96%, proline 9.12%, glycine 3.59%, alanine 3.37%, and cysteine 1.57%, which were higher than those for the control. The contents of the other 6 amino acids for WRS were lower than those for the control. The materials （Triticum monococcum L., Triticum carthlicum Nevski, and Triticum turgidum L.） contained relatively high concentration of the most deficient EAAs （lysine, threonine, and methionine）. Comparing with FAO/WHO amino acid recommendations, the amino acid scores （AAS） of lysine （49.8%）, threonine （70.7%）, and sulfur-containing amino acids （74.8%） were the lowest, which were considered as the main limiting amino acids in WRS. It was observed that the materials with Triticum urartu Turn. （AA） and Aegilops speltoides Tausch. （SS） genomes had relatively high contents of protein and EAA. The contents of protein （16.91%）, phenylalanine （4.78%）, isoleucine （3.53%）, leucine （6.16%）, and valine （4.09%） for the diploid materials were higher than those for the other materials. These results will provide some information for selecting parents in breeding about nutrient quality and utilization of fine gene in wheat.

关键词： wheat-related species protein content amino acid composition amino acid score

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Analysis on Chemical Constituents of Rhodiola crenulata

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Medicinal Plant 2018年第1期9卷 16-18页

作者： Li PU Changzhong MA Jiachao DOU Fumin CHI Lin YANG Xuedong GU Department of Food Science Tibet Agricultural and Animal Husbandry College

[Objectives] To measure and analyze chemical composition of R. crenulata. [Methods] Taking R. crenulata in Lang County of Tibet as the research object,the routine nutritional components,trace elements and amino acid were determined,and the nutrition was evaluated by the international general evaluation method. [Results]The protein content of R. crenulata in Lang County of Tibet was 2. 08%,and fat was 5. 67%. amino acid was incomplete amino acid,and Ile,Met + Cys were the first limiting amino acids of rhodiola root protein,while Leu was the second limiting amino acid of rhodiola root protein. The final amino acid score was 0. Magnesium,iron,zinc and other mineral elements were abundant,and there was no mercury,cadmium,lead and other heavy metals residues. [Conclusions]The research could provide a powerful basis for industrialization development of rhodiola.

关键词： Rhodiola crenulata Chemical composition amino acid score

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