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Methyl Paraben Sodium U.S.P.

SYSTEM MANUAL
ISSUE NO : 01
Document No.
Revision No.
Effective date
Page
QAI/Q/03/21
01
01-Jul-07
1 of 1
SODIUM METHYL PARABEN U.S.P
Chemical Name

Sodium Methyl 4-Hydroxybenzoate

 Molecular Formula

C8H7NaO3

  Molecular Weight

174.13




 Structural Formula
 CAS Number

5026-62-0

 Packing

25 Kg, 20kg(4 x 5 kg)

 The Shelf-life

3 years

 Storage conditions and precautions

Store in a well-closed containers.

 Use Antimicrobial Preservative
 
NO. Test Observation
1.
 Description

White, hygroscopic powder.

2.
 Solubility Freely soluble in water; sparingly soluble in alcohol; insoluble in fixed oils.
3.
 Identification

A.       Dissolve 0.5 gm in 5 ml of water, acidify with hydrochloric acid; and filter the resulting precipitate. Wash the precipitate with water and, dry it over silica gel for 5.0 hrs: The infrared absorption spectrum of a mineral oil dispersion of it exhibits maxima only at the same wavelengths as that of a similar preparation of usp Methyl Paraben RS. 

B.    Ignite about 0.3 gm, cool, and dissolve the residue in about 3 ml of 3N hydrochloric acid. A platinum wire dipped in this solution imparts an intense, persistent yellow colour to a non-luminous flame.

4.
  PH Between 9.5 and 10.5, determined in a 0.1% w/v solution, appendix 8.11
5.
 Water Not more than 5.0 %
6.
 Chloride Not more than 0.035 %
7.
 Sulphate Not more than 0.12 %
8.
 Organic volatile  impurities. Method-I <467>. Meets the requirements.
9.
 Assay on dried basis
 (As  C8H7NaO3)
Not less than 98.5% and not more than 101.5%
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