Figure 1.
Effect of UV irradiation sources on the efficacy of vitamin D2 synthesis in oyster mushrooms.
Results are expressed as the mean±SD of three replicates; Different small or capital letters are significantly different at p<0.01.
Table 1.
Effects of independent variables on vitamin D2 synthesis in oyster mushrooms under UV-B irradiation.
Table 2.
Experimental design and central composite design results.
Table 3.
ANOVA results for the response surface quadratic model.
Figure 2.
Response surface and contour plots for vitamin D2 production in oyster mushroom.
A: Effects of ambient temperature and exposure time on vitamin D2 synthesis in oyster mushrooms at a constant UVB irradition intensity of 0.90 W/m2; B: Effects of ambient temperature and UVB irradition intensity on vitamin D2 synthesis in oyster mushrooms at a constant time period of 80 min; C: Effects of UVB irradition time and intensity on vitamin D2 synthesis in oyster mushrooms at a constant ambient temperature of 35°C.
Table 4.
Vitamin D2 content in irradiated mushrooms from different studies.
Figure 3.
Conversion of ergosterol into vitamin D2 in homogenized mushroom powder.
One gram of the lyophilized oyster mushroom powder (under 60-mesh) was spread over an area of 500 cm2 and subjected to UV-B irradiation for different time, at the intensity of 1.14 W/m2 and temperature of 28.16°C.