Читать книгу Dry Beans and Pulses Production, Processing, and Nutrition онлайн

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It is recognized that black beans possessing a shiny seed coat will imbibe less water and at a slower rate, resulting in less total pigment loss than beans with dull‐appearing seed coats. This characteristic is likely associated with polar‐phased (lipids/waxes) components deposited within the cuticle of the testa. For example, Shiny Crow, a distinctive black bean cultivar released by Colorado State University in 1999, possesses a brilliant glossy seed coat sheen and is particularly valued in the fresh market sector due to its deep black pigmentation. Black beans with the highest rates of water uptake were shown to have the highest rates of pigment loss (Raven, Black Jack and Black Magic) and had about 90% pigment loss compared to Shiny Crow and Shiny Harblack, with about 50% pigment loss. Thus, these data suggest that the opaque (dull) seed coat has the highest water uptake (rate and total quantity) and the greatest pigment loss compared to shiny‐coated cultivars (Bushey et al. 2000, Bushey and Hosfield 2007).