Abstract: Vitamin D helps the body to absorb calcium sources, D₂ and D₃ have the same effect, which D₂ is mainly from plant foods. Ergosterol, the precursor of vitamin D₂, is more common in mushrooms. Through the study of ultraviolet light wavelength, light work time, light distance, temperature and humidity of the light environment in the refrigerator with low temperature, and the effect of vitamin D₂ on different mushrooms was studied. The results showed that: UVC(270-280 nm), the light time is 2 hours, the light distance is 15 cm, the refrigeration is 4℃, the humidity is 50-60%, the fresh mushroom vitamin D₂ efficiency is greater than 5155%; And because Pleurotus pulmonarius is small, and the light area with ultraviolet is large, so it has a better improvement effect. The above conclusions provide technical parameters for the design of mushroom nutrition improvement scheme in low temperature environment.

Key words: Vitamin D₂, Mushroom, Ergosterol, Refrigerator