Parabens have been successfully used in cosmetics for more than 80 years. The use of Paraben, alone or in combination with other compounds, is well suited for the preservation of cosmetics.
In most cosmetics, Parabens are used at very low levels ranging from 0.01 to 0.3%. The product containing Parabens may be used on an occasional or a consistent basis and their use may extend product life.
|Physical form||White or almost white hygroscopic crystalline powder|
|Solubility||Freely soluble in water
Methalene chloride -insoluble
|IR||The infrared absorption spectrum of the sample should be concordant with the reference spectrum of Methyl parahydroxybenzoate|
|Reaction of Sodium Salt||Passes the test|
|Appearance of solution||A 10% w/v solution in carbon dioxide free water is clear and not more intensely coloured than reference solution BY6 (determined on 5.0gm)|
|pH||9.5 - 10.5|
|Related substances by HPLC||Impurities A- not more than 4%
Unspecified impurities: not more than0.5%
Sum of impurities other than A: Not more than1.0%
|Water||Max.5.0% determined on 0.500 gm|
|Assay by HPLC (C₆H₈O₃)||95.0%-102.0% (OAB)|
|Certification||BP- 2018 specifications|