维生素C
详细说明
ASCORBIC ACID (VITAMIN C) (50-81-7)
Formula: C₆H₈O₆
M.W.: 176.13
Appearance: White or almost white crystals, crystalline powder
Specifications: USP42
Assay: 99.0%-100.5%
Identification: Positive Reaction
Clarity of Solution: Clear
Color of Solution: BY7 max
Residue on ignition: 0.1% max
Specific Optical Rotation: +20.5° - +21.5°
PH (2% in Water): 2.4 - 2.8
PH (5% in Water): 2.1 - 2.6
Melting point: 190 - 192℃
Heavy Metals (as Pb): 10ppm max
Copper: 5ppm max
Iron: 2ppm max
Arsenic: 2ppm max
Lead: 0.5ppm max
Cadmium (Cd): 0.5ppm max
Mercury: 0.1ppm max
Impurity E: 0.2% max
Impurities C,D: 0.15% max
Unspecified Impurities: 0.1% max
Residual Solvents (as methand): 3000ppm max
Loss on Drying: 0.4% max
Total Plate Counts: 1000cfu/g max
Yeasts and Moulds: 100cfu/g max
Escherichia coli: negative in 10g
Salmonella: negative in 25g
Staphylococcus Aureus: negative in 25g
Package: in 25kg cartons (20MT/FCL).
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