Journal of Nutritional Science and Vitaminology
Online ISSN : 1881-7742
Print ISSN : 0301-4800
ISSN-L : 0301-4800
A Pitfall in Determining the Globulin/Albumin Ratio in Amaranth Grains
Yotaro KONISHIJunko AZUMAYAKazuko HORIKAWANobuji NAKATANI
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1992 Volume 38 Issue 2 Pages 215-220

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Abstract

In amaranth grains (Amaranthus hypochondriacus L. and Amaranthus cruentus L.), there were two albumin (Alb) fractions, Alb-1 and Alb-2; Alb-1 was extracted with water or 0.5M NaCl, and Alb-2 was extracted with water after extracting Alb-1 and globulin. The amount of Alb-2 comprised about 30% of the total albumin and globulin content. Little or no measurable protein corresponding to the amaranth Alb-2 was extracted from seeds of buckwheat (Fagopyrum esculentum Moench), quinoa (Chenopodium quinoa L.), or barley (Hordeum vulgare L. cv Sekitorisai-1). That the globulin/albumin ratio (G/A) in amaranth grains has been conflicting among investigatiors probably accounts for the consideration of Alb-2 during extraction. We here report the revised G/A ratio of 0.3-0.4.

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