Relationship between anthocyanin composition and paste colour in purple-fleshed sweetpotato. (186)

Masaru Yoshinaga, Makoto Yoshimoto, Osamu Yamakawa

Abstract


Genotype diversity in anthocyanin composition and the colour of paste from the storage roots of sweetpotato [Ipomoea batatas (L.)] is described. Investigation of anthocyanin extract by high performance liquid chromatography (HPLC) revealed that the proportion of six major anthocyanins varied among genotypes; these six anthocyanins were identified as acylated cyanidin and peonidin derivatives. The colour of paste made from purple-fleshed sweetpotato also varied, ranging from red purple to blue purple. Genotype diversity in paste colour was evaluated by their two reflectance values, L* and b*:a* ratio. A significant positive correlation was observed between b*:a* ratio and the relative percentage of peonidin type of pigments. An increase in peonidin type of pigments increased the degree of redness in the paste.

Keywords


Ipomoea batatas (L.); Anthocyanins; Cyanidin; Peonidin; Paste colour

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