Journal
BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY
Volume 80, Issue 8, Pages 1623-1631Publisher
OXFORD UNIV PRESS
DOI: 10.1080/09168451.2016.1164587
Keywords
canavalin; heating; magnesium chloride; protein precipitation; sword bean
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Funding
- The Tojuro Iijima Foundation for Food Science and Technology [11]
- Grants-in-Aid for Scientific Research [25450167] Funding Source: KAKEN
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Sword bean (Canavalia gladiata) seeds are a traditional food in Asian countries. In this study, we aimed to determine the optimal methods for the precipitation of sword bean proteins useful for the food development. The soaking time for sword beans was determined by comparing it with that for soybeans. Sword bean proteins were extracted from dried seeds in distilled water using novel methods. We found that most proteins could be precipitated by heating the extract at more than 90 degrees C. Interestingly, adding magnesium chloride to the extract at lower temperatures induced specific precipitation of a single protein with a molecular weight of approximately 48kDa. The molecular weight and N-terminal sequence of the precipitated protein was identical to that of canavalin. These data suggested that canavalin was precipitated by the addition of magnesium chloride to the extract. Our results provide important insights into the production of processed foods from sword bean.
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