Citric acid is an organic acid widely used in food, medicine and daily-use chemical industry. Food grade citric acid is often used in beverage, wine, candy, biscuits, snacks, canned juice, dairy products and so on. It is a sour agent and preservative in beverage and food industry.
Industry grade citric acid can be used as reagents for chemical analysis. Also can be made to a formaldehyde-free anti-creasing finishing agent. Not only wrinkle effect, and low cost.
According to the report, flammulina velutipes' storage is not good. For better storage, people always put citric acid food grade during salt processing so can extent the preservative time to 10 months or 1 year. But there is a requirement of citric acid dosage.
Consuming excessive food with citric acid long-ter, will lose loss of calcium in the body. And using citric acid industrial grade immersion, chemical residues can damage the nervous system, cause even cancer.