| Summary: | 碩士 === 國立中興大學 === 食品暨應用生物科技學系所 === 107 === Sweet potato (Ipomoea batatas (L.) Lam) is one of the most important food crops in the worldwide. Sweet potatoes are suitable for cultivation in all seasons in Taiwan, because Taiwan is located in both tropics and subtropics zone that the environmental conditions are suitable for sweet potato growth. Sweet potato is the second largest food crop in Taiwan. There is being long history for sweet potatoe studies, and many cultivars were developed including edible, processed and green leafy vegetable.
The sweet potato has been reported to have numerous health benefits including anti-oxidation, anti-inflammatory, anti-cancer, anti-obesity, anti-ulcer, liver protection, anti-diabetes, vitamin A supplementation and others. There are many bioactive compounds in sweet potato root tubers such as chlorogenic acid derivatives, carotenoids, anthocyanins and flavonoids. However, there was no completed compositional reports for the cultivars of Taiwanese sweet potatoes. Therefore, in the study, analyzed the composition of phytochemicals in the sweet potato flesh and peel of nine different cultivars cultivated in Taiwan.
In this study, the content of phytochemicals has significant differences in these nine cultivars of Taiwanese sweet potato. The total phenol of different cultivars of sweet potato peels is from 13.30 ± 0.56 to 76.94 ± 0.87 mg / g. The total flavonoid of different cultivars of sweet potato peels is from 1.47 ± 0.03 to 12.96 ± 0.43 mg / g, In the comparison of total phenol and total flavonoid, sweet potato peels is higher 4-20 times to flesh. However, these contents of total carotenoid and total anthocyanin peels and flesh were equal to. Chlorogenic acid and 3,5-DCQA were the most dominant phenolic acids in sweet potato. TNG 66 (Tainung 66) peel is highest than other cultivars in the total content of 5 chlorogenic acid derivatives (58068.54 ± 1210.26 μg/g, dw). The composition of carotenoids and anthocyanins can affect color of sweet potato flesh. The most important carotenoid is β-carotene to sweet potatoes, while red-fleshed sweet potatoes TNG 64, TNG 66 and TYY 3 are rich β-carotene in nine cultivars of sweet potatoes (271.80 ± 6.68 ~ 450.88 ± 8.25 μg/g, dw). Because TNG 73 and HLN 1 are purple-fleshed sweet potatoes , the total content of anthocyanidins were higher than red-fleshed and yellow-fleshed in nine cultivars of sweet potatoes ( 2.16 ± 0.02 ~ 2.97 ± 0.02 mg / g vs ND ~ 0.74 ± 0.02 mg / g, dw), and anthocyanidin is belong to the peonidin type which is a greater degree of redness. Sweet potato peel is usually considered as waste during food processing. This study found that TNG 66 peel has higher content of phtochemical, which can be developed into functional food and improved the utilization value of sweet potato peel. This study provides the database of phytochemicals content of each Taiwanese sweet potato, which will be used for future research on the commercial application value and physiological activity.
|
|---|
