Effect of controlled differential sieving processing on micronutrient contents and in vivo antioxidant activities of Hib
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Effect of controlled differential sieving processing on micronutrient contents and in vivo antioxidant activities of Hibiscus sabdariffa L. calyxes powder Markusse Deli1 • Richard Marcel Nguimbou1 • Elie Njantou Baudelaire1,2 Nicolas Njintang Yanou1,3 • Joe¨l Scher2 • Carl Moses Mbofung1
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Received: 9 January 2020 / Revised: 24 August 2020 / Accepted: 9 September 2020 The Korean Society of Food Science and Technology 2020
Abstract Sun-dried calyxes of Hibiscus sabdariffa were finely grinded and fractionated by controlled differential sieving processing (CDSp) into four granulometric classes. The obtained powder fractions were examined for their micronutrient contents and in vivo antioxidant properties in high-fat diet induced oxidation model rats. Unsieved powder and lyophilized ethanolic extract were used for comparison. Micronutrient contents and antioxidant properties were significantly influenced (p \ 0.05) by particle sizes. The mineral, vitamin, carotenoid and anthocyanin contents were shown to be higher in smaller powder particles. Comparatively, the ethanolic extract powder had the higher carotenoid, vitamin and anthocyanin contents while & Richard Marcel Nguimbou [email protected] Markusse Deli [email protected] Elie Njantou Baudelaire [email protected] Nicolas Njintang Yanou [email protected] Joe¨l Scher [email protected] Carl Moses Mbofung [email protected] 1
Department of Food Sciences and Nutrition, ENSAI, University of Ngaoundere, PO Box 455, Ngaoundere, Cameroon
2
Laboratoire d’Inge´nierie des Biomole´cules (LIBio), Universite´ de Lorraine, 2, Avenue de la Foreˆt de Haye, B.P. 172, 54500 Vandœuvre-le`s-Nancy, France
3
Department of Biological Sciences, Faculty of Sciences, University of Ngaoundere, PO Box 454, Ngaoundere, Cameroon
the superfine powders \ 180 lm and 180–212 lm had the higher mineral contents and antioxidant properties which was characterized by high superoxide dismutase, catalase activities and low malondialdehyde production. Plant grinding followed by CDSp may be an option to improve micronutrient content and antioxidant activity of plant powders. Keywords Hibiscus sabdariffa calyx Powder fraction Ethanolic extract Micronutrient Antioxidant activity
Introduction Hibiscus sabdariffa L. is an herbaceous plant of the family of Malvaceae widely distributed in tropical and subtropical areas (Sinela et al., 2017). It is extremely attractive in various parts of Africa such as Cameroon from a food usages and medicinal point of view for its calyxes, leaves and seeds. Specifically, its calyxes representing the most used part of hibiscus plant, which used as food coloring. It is also used in preparation of local soft drink known as ‘‘fole´re´’’ in the northern regions of Cameroon. Previous phytochemical researches on H. sabdariffa calyxes revealed the existence of macronutrients such as proteins, fats, carbohydrates and fiber (Deli et al., 2019a; Deli et al., 2019b). They have also been reported to be a good source of micronutrients, suc
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