Vitamin D sub(2) Formation from Post-Harvest UV-B Treatment of Mushrooms (Agaricus bisporus) and Retention During Storage

The objectives of this research were to study the effects of high intensity (0.5, 0.75, and 1.0 mW/cm super(2)), dose (0.5, 1.0, and 1.5 J/cm super(2)), and postharvest time (1 and 4 days) on the vitamin D sub(2) formation in Portabella mushrooms (Agaricus bisporus) as a result of UV-B exposure, as...

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Bibliographic Details
Published in:Journal of agricultural and food chemistry 2008-01, Vol.56 (12), p.4541-4544
Main Authors: Teichert, Arnaud, Roberts, John S, McHugh, Tara H
Format: Article
Language:English
Subjects:
Agaricus bisporus
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Summary:The objectives of this research were to study the effects of high intensity (0.5, 0.75, and 1.0 mW/cm super(2)), dose (0.5, 1.0, and 1.5 J/cm super(2)), and postharvest time (1 and 4 days) on the vitamin D sub(2) formation in Portabella mushrooms (Agaricus bisporus) as a result of UV-B exposure, as well as the vitamin D sub(2) degradation in treated mushrooms during storage. Within each intensity application, dose had the largest effect where more exposure converted more vitamin D sub(2) from ergosterol. Similar dose across each intensity application resulted in similar vitamin D sub(2) concentration. Practical commercial production requires as short a treatment time as possible, and intensity was a major factor from this standpoint where the time it took to achieve a similar vitamin D sub(2) concentration for similar dose exposure was significantly reduced as intensity increased. By using an intensity of 1.0 mW/cm super(2) at a dose of 0.5 J/cm super(2), the concentration of vitamin D sub(2) produced was 3.83 mu g/g dry solids of mushrooms in 8 min, whereas using an intensity of 0.5 mW/cm super(2) at a dose of 0.5 J/cm super(2), the concentration of vitamin D sub(2) produced was 3.75 mu g/g dry solids of mushrooms in 18 min. Also, postharvest time did not have a significant effect on vitamin D sub(2) formation in mushrooms that were treated 1 and 4 days after harvest. Vitamin D sub(2) degraded in treated mushrooms during storage by apparent first-order kinetics, where the degradation rate constant was 0.025 h super(-1). The information provided in this study will help mushroom producers develop commercial-scale UV treatment processes to add value to their crop while improving consumer health. KW: Ultraviolet; Agaricus bisporus; mushrooms; vitamin D; intensity; dosage; degradation.
ISSN:0021-8561
DOI:10.1021/jf0732511