Color Tone Analysis of Adzuki Beans and Bean Paste and its Application to Quality Evaluation

Abstract

　Color is an important quality of adzuki beans and bean paste. However, as an indicator, color is ambiguous, and it is desired to construct a quantitative quality evaluation system. In this study, quantitative quality evaluation methods of the color tone of adzuki beans and bean paste were used with a visual analyzer to reflect the color of the entire sample group. The skin of raw 'Erimo-shozu' adzuki beans from Abashiri is deep red and its resulting bean paste is also darker, whereas the red color of 'Tianjin' adzuki bean skin is lighter, and it was also statistically clear that the red color of the bean paste produced therefrom is also lighter. It is presumed that the color of the bean paste reflects the color of the raw red adzuki bean skin, suggesting that this method will be an effective means of selecting raw adzuki beans based on the bean paste application.