Concentration of vitamin D₂ in white button mushrooms (Agaricus bisporus) exposed to pulsed UV light
2011
Koyyalamudi, Sundar Rao | Jeong, Sang-Chul | Pang, Gerald | Teal, Anthony | Biggs, Tony
Enrichment of vitamin D₂ in Agaricus bisporus white button mushroom (WBM) using continuous UV light needs a longer exposure time, which can lead to discoloration. Using a Xenon pulsed UV light source, the yield of vitamin D₂ was evaluated in freshly harvested button mushrooms and mushroom slices after exposure to 2.5, 3, 6 and 9 pulses of UV light at an average dose of 1.150J/cm² energy per pulse. Increase in vitamin D₂ content was proportionate to the number of pulses of UV light. There was no difference in the vitamin D₂ content of mushrooms between 200g and 500g punnets for the corresponding number of pulses (737±81, 847±38, 1148±182, 1611±444% versus 747±48, 911±35, 1307±109, 2028±181% Daily Value/serving, respectively; P>0.05). Mushrooms in the top layer showed significantly higher amounts of vitamin D₂ content than those in the bottom layer of a 500g punnet (657±22, 796±76, 1433±138, 1878±178% versus 129±60, 237±117, 403±35, 830±257% DV/serving, respectively; P<0.01). A single layer of sliced mushrooms (∼5mm thick) showed higher amounts of vitamin D₂ content than sliced mushrooms packaged together after pulsed UV light exposure (7882±1074, 6867±944, 10,826±472, 13,001±1635% versus 1221±281, 1293±210, 1598±207, 2018±459% DV/serving, respectively; P<0.001). Discoloration of whole or sliced mushrooms was not observed. Thus, pulsed UV light provides a highly effective method for increasing vitamin D₂ levels in A. bisporus white button mushroom.
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