Nutritional Assessment of Proteins in Highland Barleys Grown in High-incidence Areas of Kashin-beck Disease in Aba, Sichuan

doi:10.7506/spkx1002-6630-201323059

Abstract

Abstract:

The nutritional value of proteins in highland barleys grown in several high-incidence areas of Kashin-Beck
disease (KBD) in Aba prefecture, Sichuan province was evaluated by internationally recognized methods in comparison to
those from medium-incidence and non-incidence areas in the same prefecture. The results showed that the ratio of essential
to total amino acids in highland barleys from medium-incidence areas was 33.69% compared to 33.99% for those from highincidence
areas and 36.05% for those from non-incidence areas. The amino acid score (AAS), essential amino acid index
(EAAI) and score of ratio coefficient of amino acid (SRCAA) of highland barleys from both high- and medium-incidence
areas were lower than those of highland barleys from non-incidence areas. The nutritional value of proteins in highland
barleys from non-incidence areas was higher, whereas those from high- and medium-incidence areas had an unbalanced am
ino acid composition, inferior protein quality and lower protein utilization. The first limiting amino acid in highland barleys
was Lys for the three areas, and the second limiting amino acids were Met and Cys for high- and medium-incidence areas
and Thr for non-incidence areas. The average amino acid scores of Lys in highland barleys showed a significant difference
between incidence and non-incidence areas (P ＜ 0.05). In conclusion, proteins in highland barleys from high- and mediumincidence
areas of KBD in Aba, Sichuan have a low nutritional value and high dietary consumption of highland barleys may
lead to deficiency of sulphur-containing amino acids and Lys in the body.

Key words: highland barley, amino acid, amino acid score, essential amino acid index

CLC Number:

R151.3

ZHANG Lu，PU Biao*，CHEN An-jun，LIU Xing-yan. Nutritional Assessment of Proteins in Highland Barleys Grown in High-incidence Areas of Kashin-beck Disease in Aba, Sichuan[J]. FOOD SCIENCE, 2013, 34(23): 296-299.

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