Effects of sulfite treatment on the quality of black fungus

In the present study, the color, total sugar, contents of soluble protein, total polyphenols, total flavonoids, and soluble vitamins, and other indicators of black fungus treated with sodium metabisulfite under different conditions were measured to evaluate the sensory and nutritional changes in black fungus after sulfite treatment. The results showed that use of sodium metabisulfite increased the lightness of black fungus, significantly increased the contents of total polyphenols and reducing sugars in the fungus (p < 0.05), increased the content of soluble protein, and decreased the content of total flavonoids. In addition, sodium metabisulfite destroyed vitamin C and B1 in black fungus. When the concentration of sodium metabisulfite was 0.5% and the soaking time 20 or 30 min, the color of black fungus improved markedly, and nutrients were not negatively affected. Therefore, the use of sodium metabisulfite improved the quality of fungus to a certain extent.

Automated summary

This study measured the color, composition, and nutrient content of black fungus treated with sodium metabisulfite. The results showed that the use of sodium metabisulfite increased the brightness and levels of total polyphenols and reducing sugars in black fungus, but decreased the levels of total flavonoids. The treatment also destroyed vitamin C and B1 in black fungus. However, when the concentration of sodium metabisulfite was 0.5% and the soaking time was 20 or 30 minutes, the color of black fungus improved significantly without negatively affecting its nutrients. Therefore, the use of sodium metabisulfite improved the quality of black fungus to some extent.