: 56-81-5

Molecular Formula

: C3H8O3

Molecular Weight

: 92.10
Description: Clear, colourless, syrupy liquid, unctuous to the touch, having a sweet taste. Has not more than a slight characteristic odor, which is neither harsh nor disagreeable. Is hygroscopic. Its solutions are neutral to litmus.
Solubility: Miscible with water, ethanol (96%) and with alcohol. Slightly soluble in acetone. Insoluble in fatty oils, in essential oils, in chloroform, in ether and in fixed and volatile oils.
Identification (By IR): IR spectra of the sample should be concomitant with IR spectra of the standard.
Identification (Diethylene glycol): NMT 0.10%
Identification (Ethylene glycol): NMT 0.10%
Identification (By GC Chromatogram): The retention time of the glycerine peak of the Sample solution corresponds to that obtained in the Standard solution.
Identification 1 (By Chemical test): Within 10 min, the blue colour does not diffuse into the lower layer.
Identification 2 (By Chemical test): Vapours (acrolein) are evolved which blacken filter paper impregnated with alkaline potassium tetraiodomercurate solution.
Appearance of solution: Clear and colorless solution.
Color: The colour should not be darker than reference solution.
Acidity or alkalinity: Pink colour should produce after adding 0.2 mL of 0.1 mol/L sodium hydroxide solution.
Refractive index, 20°C: 1.470 - 1.475
Relative density (20°C): 1.258 - 1.268
Aldehydes and reducing substances: The light absorption of the test solution at 655 nm should not be more than that of 2.0 mL of the reference solution.
Fatty acids and esters: NMT 2.0 mL of sodium hydroxide (0.1 mol/L) VS should require.
Related substances: Impurity A (Diethylene glycol): NMT 0.1%
Related substances: Any other impurity with a retention time less than the retention time of glycerol: NMT 0.1%
Related substances: Total of all impurities with retention times greater than the retention time of glycerol: NMT 0.5%
Related substances: Individual impurity: NMT 0.1%
Related substances: Total impurities: NMT 1.0%
Halogenated compounds: NMT 35 ppm
Sugars: The solution should remain blue and no precipitate should form.
Chlorides: NMT 0.0006%
Sulphate: NMT 0.002%
Water: NMT 2.0%
Residue on ignition: NMT 0.01%
Assay (Anhydrous basis): 99.0% - 101.0%
Chlorinated substances: NMT 0.003%
Readily carbonizable substances: Any colour produced should not more intense than that of an equal volume of a reference solution.
Ammonium: No odour of ammonia should produced.
Calcium: The solution should be clear.
Iron: NMT 0.00005%
Total aerobic microbial count: NMT 100 CFU/gm
Total combined yeast and mold count: NMT 10 CFU/gm
Bacterial endotoxins: NMT 5 EU/gm
E.coli: Should not be detected.
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