... food industries, such as beverage, fermentation wine, jelly, canned fruits and jam, as sour agent, enhance agent, buffer agent, antioxidant, ... be used as material to make syrup citrate, ferroammonium citrate and sodium citrate. In chemical industry, they can be used as ... , catalytic agent, activating agent, purging agent, adsorbent, styler and detergent. In addition, citric acid has its special uses in ...