What are the methods for keeping shiitake mushrooms fresh with sealed packaging and refrigeration?

There are many methods for keeping shiitake mushrooms fresh, including quick freezing, refrigeration, chemical treatment, controlled atmosphere, and microwaving. Shiitake mushrooms to be kept fresh by dehydration and refrigeration should stop being sprayed with water 10 hours before harvest and be harvested when they reach eight-tenths maturity. After harvest, select them and remove impurities, cut off the mushroom stems, grade them according to customer requirements, then place the shiitake mushrooms on a mat with the gills facing down and dry them in sunlight. In autumn and spring, dry them for 3-4 hours; in summer, dry them for 1-1.5 hours. After drying, the dehydration rate of the shiitake mushrooms is 25%-30%, that is, 100 kg of fresh shiitake mushrooms becomes 70-75 kg after drying. At this point, the mushroom stems feel moist when pinched, and the gills have slightly shrunk. After grading the dried shiitake mushrooms, pack them in fixed quantities into paper boxes, put fresh-keeping bags over the boxes, then place them in cartons, and store them at 0°C.

Fresh shiitake mushrooms to be kept fresh by sealed packaging and refrigeration should, after selection and trimming, be placed into plastic bags with the gills facing up, then the bags should be sealed and stored at 0°C. This method generally keeps them fresh for about 15 days and is suitable for self-service supermarkets@#@136@#@.