Changes of Carotenoid Components and Content in Sweetpotatoes at Different Developmental Stages
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Abstract:
In order to explore the accumulations of carotenoids in the development of sweetpotato tubers，the color characteristic values and carotenoid components and contents in sweetpotato tubers with different flesh colors at 45, 75, 105, 135 and 165 d after transplanting were detected by the chroma meter and ultra-high performance liquid chromatography. The results showed that the total content of carotenoids in orange-red-fleshed sweet potato （ ORFSP ） was much higher than that of other varieties, up to 299.07 μg ·g-1. During the development process, the total amount of carotenoids accumulated continuously in the early stage, but most varieties showed a significant decrease at 165 d. A total of 11 carotenoids were detected in 8 sweetpotato varieties. Among them, β-carotene, violaxanthin, neoxanthin, antheraxanthin and lutein had high content and stable during the development of sweetpotato. The proportion of violaxanthin and antheraxanthin in yellow-fleshed sweetpotato （YFSP） is high, while the orange-fleshed sweetpotato （OFSP） mainly accumulated lutein and β-carotene. The content of β-carotene in ORFSP account for 81.20 % -94.38 % of total content, and β-carotene is the most important carotenoid in sweetpotatoes. Carotenoids in sweetpotato were negatively correlated with brightness (L*) and chroma angle (H*), and positively correlated with redness (a*) and color saturation (C*). Neoxanthin was significantly positively correlated with yellowness (b*). In summary, the carotenoid components of OFSP and ORFSP were more abundant, among which the carotenoid content of ORFSP was higher, and the carotenoid monomer containing oxygen functional groups in YFSP accounted for a relatively high proportion in carotenoids; The results could provide a theoretical basis for the study of nutritional quality and variety breeding of sweetpotato.
