In vitro bioaccessibility for some nutrients content in cooked pulp of sweet potato cultivars during traditional storage

Sweet potatoes are source of high quality nutrients and bioactive compounds, but physiological changes during the storage could modify the content or availability of these nutrients and the nutritional value.
In this work we determined the colour, dry matter, total soluble solids, polyphenols, β-carotene, and total glucose content and in vitro bioaccessibility of β-carotene and glucose in cooked pulp of ‘Arapey’, ‘Beauregard’ and ‘Clon9227’ sweet potato cultivars during traditional storage.
The amounts of those components were determined for 100 g fresh weight of cooked pulp from whole roots at harvest (0), 3 and 7 months of storage without any control of environmental condition.
Total polyphenols decreased significantly in ‘Arapey’ (52.9 to 28.5 mg GAE) and ‘Beauregard’ (61.9 to 33.1 mg GAE) with the storage time but not in ‘Clon9227’ (69.7 to 62.0 mg GAE). The β-carotene contents was higher in ‘Clon9227’ (10.0 mg) than ‘Beauregard’ (7.5 mg) and ‘Arapey’ (0.52 mg) and a similar amount was observed throughout the storage time.
However, the bioaccessibility of β-carotene was very low (‘Arapey’ 4%, ‘Beauregard’ 7%, ‘Clon9227’ 0.5%) and dependent of the interaction between the cultivar and the month of storage.
The total glucose content was similar for the three cultivars (‘Arapey’ 20.5 g, ‘Beauregard’ 20.8 g, ‘Clon9227’ 17.5 g). The bioaccessibility of glucose was 5% in ‘Arapey’ and for the other cultivars 9% of the total glucose content.
After the third month of storage the highest glucose bioaccessibility was observed (‘Arapey’ 1.5 g, ‘Beauregard’ 2.5 g, ‘Clon9227’ 2.3 g). These results show that the cultivars and the storage time significantly affect the nutritional value in sweet potato roots.

VIII International Postharvest Symposium: Enhancing Supply Chain and Consumer Benefits – Ethical and Technological Issues

F. Zaccari, M.C. Cabrera, A. Saadoun

Ipomoea batata L., postharvest, polyphenols, carotenoids, total glucose

https://doi.org/10.17660/ActaHortic.2018.1194.149