Abstract
Vitamin D is essential for the human body and mushrooms are one of the natural sources of it. Many research works are aimed at enhancing the vitamin D2 content of mushrooms with UV irradiation in order to increase their vitamin D2 level, by transforming their natural ergosterol content into vitamin D2. The subjects of most of these studies are different kind of post-harvest cultivated mushrooms. In our experiment biologically active, pre-harvest oyster mushrooms were treated in the growing room with UVB and UVC light. UVB and UVC lamps (operating on 312 and 254 nm) and 6 time periods of irradiation (15, 30, 45, 60, 75 and 90 min) were used. After three consecutive days of treatments the yield were measured and samples were taken for vitamin D2 and ergosterol analysis. Data showed considerable increase (from 0,67 μg/g to 3,68 μg/g, f.w.) in vitamin D2 levels at every time period in case of both wavelengths.
Highlights
The dietetic value of the different mushroom species is well known and their role in treating and preventing various illnesses is getting more important as well
Different wavelengths of UV radiation were applied in different time periods to study the effect of UV light and duration of irradiation on changes in vitamin D2 level
The changes of vitamin D level after UVB treatments are shown on Fig. 1
Summary
The dietetic value of the different mushroom species is well known and their role in treating and preventing various illnesses is getting more important as well. The elements and metabolites of mushrooms enable them to play a vital role in treating these serious illnesses (Szili, 2008). Oyster mushroom species belong to the group of healthy foods, as they contain high levels of protein and vitamins, but low level of energy. Lelley and Vetter (2005) examined the nutritional composition of cultivated mushroom species, including Pleurotus ostreatus, and found that the oyster mushroom can play a vital role of preserving good health. Due to the low energy and glucose level, this species is especially suitable for those consumers who suffer from high blood pressure. Oyster mushrooms are rich in vitamins B and D, and minerals, such as potassium and phosphorus
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