§173.280. Solvent extraction process for citric acid. — Inbound Citations

(a) No. 77-92-9) is the compound 2-hydroxy-1,2,3-propanetricarboxylic acid. It is a naturally occurring constituent of plant and animal tissues. It occurs as colorless crystals or a white powder and may be anhydrous or contain one mole of water per mole of citric acid. Citric acid may be produced by recovery from sources such as lemon or pineapple juice; by mycological fermentation using Candida spp., described in §§ 173.160 and 173.165 of this chapter; and by the solvent extraction process described in § 173.280 of this chapter for the recovery of citric acid from Aspergillus niger fermentation liquor.