Methyl Paraben is most of the common parabens. This is used to make several types of cosmetic products and can stop the germ growth. This is also used as a food preservative as well as an antifungal preservative. This is a class of chemicals which preserves the products and stops the growth of bacteria as well as mold. Methyl Paraben is also responsible for dealing with sensitivity as well as irritation. This is highly recommended for the people who have allergic skin types.
Key Points:
Methyl Paraben Properties:
No. | Test | Specification | Observations |
1. | Appearance | White or almost white, hygroscopic crystalline Powder | White, hygroscopic crystalline powder |
2. | Solubility | Freely Soluble in water, sparingly soluble in ethanol (96 per cent), practically insoluble in methylene chloride. | Freely soluble in water, sparingly soluble insoluble in methylene chloride. |
3. | Identification | ||
B) IR | The infrared absorption spectrum of the sample should be concordant with the spectrum of methyl parahydroxybenzoate CRS. | Passes | |
D) Reaction of Solution | Passes the test | Passes | |
4. | Appearance of Solution | A 10 % w/v Solution in carbon dioxide-free water clear and not more intensely coloured than BY 6. (Determined on 5.0 gm) | Complies. |
5. | PH | 9.5 to 10.5 | 9.63 |
6. | Related substances by HPLC | Impurity A: Impurities: Not more than 3.0% | 1.79% |
Unspecified  impurities: Not more than 0.5 % | Not Detected. | ||
Sum of impurities Other than A: not more than 1.0 % | No Detected. | ||
7. | Chloride | Maximum 350 ppm. | Less than 350 ppm |
8. | Sulphate | Maximum 300 ppm. | Less than 300 ppm |
9. | Heavy metals | Maximum 10 ppm. | Less than 10 ppm |
10. | Water | Maximum 5.0 % Determined on 0.500 gm. | 1.12 % |
11. | Assay by HPLC (as C8H7NaO3) | 95.0 % to 102.0 % | 97.17 % |
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