Citric acid anhydrous or monohydrate, the most widely used acidulant to give a sour taste in food and beverage, also acts as a preservative, PH buffer, antioxidant and chelating agent. The European food additive number for it is E330. China is the biggest manufacturer of citric acid in the world and exported around 1 million tons in 2019.
http://www.chinafooding.com/Citric_acid_anhydrous
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