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 crystalline powder or colourless crystals|
|Solubility||Very slightly soluble in water, Freely soluble in ethanol (96%) & methanol|
|Melting Point ⁰C||125⁰C-128⁰C|
|IR||The infrared absorption spectrum of the sample should be concordant with the spectrum of Methyl parahydroxybenzoate CRS|
|Appearance of solution||A 10% w/v solution in ethanol (96%) is clear and not more intensely coloured than reference solution BY6|
|Acidity||Not more than 0.1 ml of 0.1M sodium hydroxide solution is required|
|Sulphated ash w/w||Not more than 0.1%|
|Assay by HPLC||Impurity A : NMT 0.5%
Unspecified impurities : NMT 0.5%
Total impurities : NMT 1.0%
|Assay by HPLC (C₆H₈O₃)||98.0%-102.0%|
|Certified||BP- 2018 specifications|