It is challenging to store edible fungi under normal conditions due to their high moisture content and susceptibility to spoilage. Chemical preservation methods offer a practical solution, maintaining freshness while being cost-effective and easy to implement. These techniques are widely used in the food industry to extend shelf life without significantly altering the flavor or texture of the mushrooms. 1. **Salt Preservation** Freshly harvested oyster mushrooms (Pleurotus ostreatus) can be preserved using salt. The mushrooms are immersed in a 0.6% saline solution for approximately 10 minutes, then drained and placed into plastic bags. This method allows them to remain fresh for 5–8 days when stored at room temperature. 2. **Sodium Metabisulfite Treatment** Another effective method involves spraying freshly harvested oyster mushrooms with a 0.15% sodium metabisulfite solution on a clean concrete surface. After application, the mushrooms are placed in sealed plastic bags and stored in a cool area. This technique can preserve the mushrooms for 8–30 days, depending on the temperature (10–25°C). Before consumption, they should be rinsed with fresh water to remove any residual chemicals. 3. **Ascorbic Acid Preservation** Mushrooms such as shiitake, oyster, and straw mushrooms can be treated with a 0.1% ascorbic acid solution after harvesting. The solution is sprayed directly onto the mushrooms, which are then stored in non-metallic containers. This method helps maintain freshness, color, and quality for 3–5 days, making it ideal for short-term storage. 4. **Sodium Chloride and Calcium Chloride Mixture** A mixture of 0.2% sodium chloride and 0.1% calcium chloride can be used as a soaking solution. Fresh mushrooms are submerged in this solution for 30 minutes before being stored. At temperatures between 15–25°C, the mushrooms stay fresh for about 5 days, while at cooler temperatures (5–10°C), they can last up to 10 days. This method is particularly useful for extending the shelf life of various mushroom species. These chemical preservation techniques not only help reduce food waste but also ensure that mushrooms remain safe and appealing for longer periods, making them more accessible to consumers.

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