Abstract
In an attempt to develop the food composition table for Bangladesh, the nutritional composition of nine varieties of orange-fleshed sweet potato was analyzed together with total carotenoids (TCC) and total polyphenol content (TPC). Each variety showed significant variation in different nutrient contents. The quantification of the TCC and TPC was done by spectrophotometric measurement, and the proximate composition was done by the AOAC method. The obtained results showed that total polyphenol content varied from 94.63 to 136.05 mg gallic acid equivalent (GAE)/100 g fresh weight. Among the selected sweet potatoes, Bangladesh Agricultural Research Institute (BARI) Sweet Potato 7 (SP7) contained the highest, whereas BARI SP6 contained the lowest amount of total polyphenol content. The obtained results also revealed that total carotenoids content ranged from 0.38 to 7.24 mg/100 g fresh weight. BARI SP8 showed the highest total carotenoids content, whereas BARI SP6 showed the lowest. Total carotenoids content was found to be higher in dark orange-colored flesh varieties than their light-colored counterparts. The results of the study indicated that selected sweet potato varieties are rich in protein and carbohydrate, low in fat, high in polyphenol and carotenoids and, thus, could be a good source of dietary antioxidants to prevent free radical damage, which leads to chronic diseases, and also to prevent vitamin A malnutrition.
Highlights
Sweet potatoes (Ipomoea batatas) are an exceptionally essential crop in several parts of the world, being produced in more than 100 countries
Institute (BARI) Sweet Potato 7 (SP7) contained the highest, whereas Bangladesh Agricultural Research Institute (BARI) SP6 contained the lowest amount of total polyphenol content
This study showed that the sweet potato varieties have very large genetic diversity in terms of proximate nutrients, total carotenoids content (TCC) and total polyphenol content (TPC), and the extract from these cultivars may have the potential for use as natural antioxidants, which can act as a barrier to many types of cancer and other chronic diseases
Summary
Sweet potatoes (Ipomoea batatas) are an exceptionally essential crop in several parts of the world, being produced in more than 100 countries. Sweet potato is positioned as the seventh most major food crop in the world, fourth in tropical countries [3] and the fifth most essential food crop on a fresh weight basis in developing countries after rice, wheat, maize and cassava, and it is cultivated in more than 100 developing countries [4]. It is the fourth most important crop in Bangladesh after rice, wheat and potato. This deficiency causes children to succumb to common diseases and leads to the impairment of growth and development, vision impairment, poor immune functions and, in extreme cases, results in blindness and death [5]
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