Lactose/ α- Lactose / 4-O- β- D-galactopyranosyl- α- D-glucopyranose/ α- D-Lactose monohydrate

English name：α-D-Lactose monohydrate；β-D-Gal-(1→4)-α-D-Glc；4-O-β-D-Galactopyranosyl-α-D-glucose

Other names: α- Lactose; 4-O- β- D-galactopyranosyl- α- D-glucopyranose

CAS No.: 5989-81-1

C12H22O11 • H2O=360.31

Grade: ar

Content: ≥ 99.0%

Specific rotation: +52 ~ +52.8 °

Clarity test: acceptable

Nitrogen compounds: ≤ 0.005%

Loss on drying: ≤ 0.5%

Dextrin and starch: acceptable

Water insoluble matter: ≤ 0.005%

Acidity (calculated by h+) / (mmol/100g): ≤ 0.2

Iron: ≤ 0.001%

Fat: ≤ 0.01%

Heavy metals: ≤ 0.0005%

Burning residue: ≤ 0.05%

Physicochemical properties: white crystal or crystalline powder, sweetness 70% of sucrose, density (20 ℃) 1.525g/cm3. Melting point 203 ℃ (decomposition). When heated to 120 ~ 130 ℃, the water loss becomes anhydrous, and the melting point of anhydrous is 201 ~ 202 ℃. It is soluble in water, slightly soluble in ethanol, and insoluble in ether and chloroform. It has reducibility, can reduce Peilin solution, and has right optical rotation

Purpose: biochemical research. Raw materials of culture medium and chromatographic absorbent. It is a liquid-solid component in the separation of nitroxylene and xylene isomers by GLC.

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