Differences in the content of purple pigments, catechinopyranocyanidins A and B, in various adzuki beans, Vigna angularis

• Published in: Bioscience, biotechnology, and biochemistry biotechnology, and biochemistry, 2023-04, Vol.87 (5), p.525-531
• Main Authors: Yoshida, Kumi, Takayama, Yoko, Asano, Tomoyo, Kazuma, Kohei
• Format: Article
• Language: English
• Subjects: China; Fabaceae; Japan; Vigna - chemistry
• ISSN: 1347-6947; 1347-6947
• DOI: 10.1093/bbb/zbad010

ABSTRACT Catechinopyranocyanidins A and B (cpcA, B) are purple pigments isolated from the seed coat of the small red bean called adzuki in Japanese (Vigna angularis). CpcA and B are known to be responsible for the purple color of an-paste. The quality evaluation of the paste is based on its purple color; therefore, it is important to analyze the contents of cpcA and B in various azuki beans, which differ in the cultivar, production area, and cultivation conditions. The extraction of cpcA and B from dried beans was conducted, followed by high-performance liquid chromatography analysis. The content of cpcA and B in various cultivars from Japan, Korea, China, and Nepal was quantified. The cpcA and B content was the highest in the regular adzuki cultivar from Hokkaido Prefecture (Japan), and that of the beans from Korea and China was low. The content of the pale-colored beans from Nepal was the lowest. Graphical Abstract Graphical Abstract The content of purple pigments (cpcA and B) in the seed coat of small red beans (Vigna angularis) from Hokkaido Prefecture (Japan), Korea, China, and Nepal was quantified.