Effects of Sun-Drying and Oven-Drying on the Nutrients, Anti-Nutrients, and Bioavailability of some Minerals in Commonly Consumed Capsicum Varieties in Nigeria

Olutayo S. Shokunbi1 ⃰, Dunmomi Afolabi1, Chinonso C. Obiukwu1, Faith T. Ogbonnaya1, Elizabeth O. Ngozi2, Gogonte H. Amah1.

1Department of Biochemistry, Babcock University, Ogun State, Nigeria
2Department of Chemistry, Foundation Diploma Program, Babcock University, Ogun State Nigeria 
2Department of Nutrition and Dietetics, Babcock University, Ogun State, Nigeria

Corresponding Author: shokunbio@babcock.edu.ng; Tel: +2348030689633
Recieved Date: 12 November 2020; Accepted Date: 8 March 2021; Published Date: 03 March
Citation: Shokunbi OS, Afolabi D, Obiukwu CC, Ogbonnaya FT, Ngozi EO, Amah GH. Effects of Sun-Drying and Oven-Drying on the Nutrients, Anti-Nutrients, and Bioavailability of some Minerals in Commonly Consumed Capsicum Varieties in Nigeria. Trop J Nat Prod Res. 2021; 5(3):591-596. doi.org/10.26538/tjnpr/v5i3.29   http://www.doi.org/10.26538/tjnpr/v5i3.29
© 2021 Shokunbi et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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The levels of nutrients and anti-nutrient in common Capsicum varieties after drying, have not been widely reported. Thus, this study was designed to determine the effects of sun-drying and oven-drying on the nutrients, anti-nutrients and bioavailability of minerals in six commonly consumed Capsicum varieties in Nigeria. Two varieties of Capsicum chinense – yellow and red ata rodo; three varieties of Capsicum annuum – tatase, bawa, and ata shombo; and Capsicum frutescens – ata wewe were purchased fresh from Oja Oba market in Ibadan, Oyo State, Nigeria. They were washed, sliced, and processed by sun-drying and oven-drying methods, before determining their proximate, minerals, ascorbic acid, anti-nutrients and bioavailability of Ca, Fe and Zn, using standard methods. The proximate results revealed that sun-drying method retained these parameters much better in most of the Capsicum varieties. The levels of eight minerals were modulated by the processing methods, with sun-drying yielding better results for most minerals in the Capsicum varieties. Furthermore, the ascorbic acid content was significantly (p<0.05) depleted by both drying protocols, with oven drying-method retaining it much better in most varieties. On another hand, the effect of drying methods was not significantly different (p>0.05) for the anti-nutrients in most varieties. The phytate/minerals and oxalate/calcium molar ratios revealed high bioavailability of Ca, Fe and Zn from all Capsicum varieties processed via sun-drying or oven-drying. Both drying methods have modulatory effects on the nutrient and anti-nutrient contents of the Capsicum varieties and can be safely applied for optimum bioavailability of Ca, Fe and Zn.

Keywords: Anti-nutrients, Ascorbic acid, Bioavailability, Capsicum varieties, Minerals, Proximate composition.
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