Citric acid also called 2-hydroxy-propane-1,2,3-tricarboxylic acid, is a component of the tricarboxylic acid cycle in all organisms. Industrial production of citric acid use fungal, yeast and citrus fruit as the major source. Aspergillus niger is majorly used for citric acid production by fermentation Manganese inhibits fermentative production of citric acid Oral supplementation of citric acid promotes tricarboxylic acid cycle and oxidative phosphorylation in mitochondria, attenuating physical fatigue.
Synonyms: 2-Hydroxy-propane-1,2,3-tricarboxylic acid
Molecular Formula: C6H8O7
Molecular Weight: 192.12
Linear Structural Formula: HOC(COOH)(CH2COOH)2
MDL Number: MFCD00011669
Purity: >=99.5%
Melting Point: 153-159 C (lit.)
Application: Citric acidhas been used as a component of citrate buffer and Fe-free sauton′s medium. It has been used in hybridization chain reaction buffer for preequilibration of coverslips for testes sections.
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Grade: ACS reagent; Redi-Dri™; anhydrous
Assay: ≥99.5%
Quality: free-flowing
Expl. Lim.: 8 %, 65°F
Impurities: Substances carbonizable by hot sulfuric acid, passes test
Ign. Residue: ≤0.02%
pKa: (1) 3.13, (2) 4.76, (3) 6.4
MP: 153-159 °C(lit.)
Anion Traces: chloride (Cl-): ≤0.001%; oxalate (C2O42-): passes test (limit about 0.003%); phosphate (PO43-): ≤0.001%; sulfate (SO42-): ≤0.002%
Cation Traces: Fe: ≤3 ppm; Pb: ≤2 ppm