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 methanol):   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 Aureusi:            negative in 25g

Package:    in 25kg cartons (20MT/FCL).