Citric acid (CA), also known as citric acid, molecular formula is C6h8o7 is an important organic acid, colorless crystal, odorless, has a strong sour taste, easily soluble in water, is an acidity regulator (GB2760- 2014) and food additives.

Citric acid is the largest organic acid produced by biochemical methods in the world. Citric acid and salts are one of the pillar products of the fermentation industry, mainly used in the food industry, such as acidulants, solubilizers, buffers, antioxidants, Deodorant, flavor enhancer, gelling agent, toner, etc.