Lactobionic Acid

Lactobionic acid (4-O-β-galactopyranosyl-D-gluconic acid) is a sugar acid. It is a disaccharide formed from gluconic acid and galactose. It can be formed by oxidation of lactose. Lactobionic acid is also used in the cosmetics industry as an antioxidant and in the rmaceutical industry as an excipient for formulation.

Specifications of Lactobionic Acid USP NF Grade:C12H22O12 (acid form) --- 358.30 --- CAS 96-82-2.C12H20O11 (δ-lactone) 340.28 --- CAS 5965-65-14-O-β-Galactopyranosyl-d-gluconic acid.

DEFINITIONLactobionic Acid is a mixture in variable proportions of 4-O-β-d-galactopyranosyl-d-gluconic acid and 4-O-β-d-galactopyranosyl-d-glucono-1,5-lactone. It contains 98% toT 102%, on the anhydrous basis.

IDENTIFICATIONA. Infrared Absorption: To pass the test.B. Thin-Layer Chromatogra: To pass the test.

IMPURITIESWater: 5.0% maximum.Appearance of Solution: 120 mg/mL of Lactobionic AcidStandard stock solution: The Sample solution is clear and not more intensely colored than the Reference solution.Optical Rotation: 10 mg/mL of Lactobionic Acid. Allow to stand for 24 h. Acceptance criteria: +23.0° to +29.0° (anhydrous substance).Reducing Sugars: To pass the test. Maximum 0.2% of reducing sugars, as glucose.Articles of Botanical Origin: 0.2% maximum.