Impact of the natural resource of UVB on the content of vitamin D2 in oyster mushroom (Pleurotus ostreatus) under subtropical settings

Tibebeselassie Seyoum Keflie; Nils Nölle; Christine Lambert; Donatus Nohr; Hans Konrad Biesalski

doi:10.1016/j.sjbs.2018.07.014

Impact of the natural resource of UVB on the content of vitamin D₂ in oyster mushroom (Pleurotus ostreatus) under subtropical settings

Saudi J Biol Sci. 2019 Nov;26(7):1724-1730. doi: 10.1016/j.sjbs.2018.07.014. Epub 2018 Aug 1.

Authors

Tibebeselassie Seyoum Keflie^{1

2}, Nils Nölle¹, Christine Lambert¹, Donatus Nohr¹, Hans Konrad Biesalski^{1

2}

Affiliations

¹ Institute of Biological Chemistry and Nutrition (140a), University of Hohenheim, Garbenstr. 30, 70593 Stuttgart, Germany.
² Food Security Centre, University of Hohenheim, Stuttgart, Germany.

Abstract

Vitamin D deficiency is a pandemic problem. Non-animal source of vitamin D is obtained from edible mushrooms. Oyster mushroom (Pleurotus ostreatus) was sliced into the size of 1 cm³, 4 cm³ and 9 cm³, and treated with the sun as a natural resource of UVB under subtropical settings in Ethiopia. The content of vitamin D was measured by using high-performance liquid chromatography (HPLC). After sun treatment, there was a significant increment in the content of vitamin D₂ from nil to 67.4 ± 28.0 µg/g dry weight (DW). Based on the results of the overall pairwise comparisons, 1 cm³ size of slice group had the highest content of vitamin D₂. Duration of sun exposure, sizes of mushroom slices and moisture content were identified as determining factors for vitamin D₂ synthesis. Exposing slices of oyster mushroom to the sunlight for <30 min provides the amount that satisfies the current recommended dietary allowance (RDA) of vitamin D without any visible change in color and texture. Thus, sun treatment of oyster mushroom is an effective and economically cheap strategy in the fight against vitamin D deficiency.

Keywords: AI, adequate intake; DRI, dietary reference intake; IU, international unit; Oyster mushroom; RDA, recommended dietary allowance; Subtropics; Sun-treatment; UVB, ultra violet ray B; Vitamin D2.