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Products

Butyl Paraben B.P


SYSTEM MANUAL
ISSUE NO : 01
Document No.
Revision No.
Effective date
Page
QAI/Q/03/44
00
1-Aug-05
1 of 1
BUTYL PARABEN B.P.
 Chemical Name

Butyl 4-Hydroxy Benzoate

 Molecular Formula

C11H14O3

 Molecular Weight

194.2


 Structural Formula

 

 

 CAS Number

94-26-8

 Packing

25 kg, 20 kg (4 x 5 kg)

 The Shelf-life

5 years

 Storage conditions and  precautions

Store in well-closed containers.

 Use Antimicrobial Preservative
 
NO.
Test
Observation
1.
 Characters

A white or almost white powder, crystalline powder or colourless crystals, very slightly soluble in water, freely soluble in alcohol and in methanol.

2. 
 Identification

First identification: A, B.

Second identification: A, C, D.  

A.  Melts between 68°C and 71°C.
   
B. The infrared absorption spectrum is concordant with the reference         spectrum of Ethyl paraben or with the spectrum obtained from Ethyl        paraben CRS.
   
C. Examine the chromatograms obtained in the test for related substances.       The principle spot in the chromatogram obtained with test solution (b) is similar in position and size to the principle spot in the chromatogram     obtained with reference solution (b).
   
D.

To about 10 mg in a test tube add 1 ml of sodium carbonate solution,        heat to boiling for 30 seconds and cool (solution A) to a further 10mg       in a test tube add 1 ml of sodium carbonate solution, the substance partly   dissolves (solution B).  Add at the same time to each of solutions A and   B  5 ml of aminopyrazolone solution R and 1 ml of potassium ferricyanide   solution R and mix. Solution B is yellow to orange brown. Solution A is     orange to Red and the colour is clearly more intense than any similar          colour that may be obtained with solution B.

3.
 Appearance of  solution A 10% w/v solution in ethanol (95%) is clear and not more intensely coloured than reference solution prepared by mixing 1.5 ml ferric chloride colorimetric solution, 0.8 ml cobaltous chloride colorimetric solution, 0.2 ml cupric sulphate colorimetric solution and 97.5 ml of 1% w/v HCl solution.
4.
 Acidity

Dissolve 1.0 g in sufficient ethanol (95%) to produce 10 ml.  To 2 ml of the solution add 3 ml of alcohol R, 5 ml of carbon dioxide-free water and 0.1 ml of bromocresol green solution R. Not more than 0.1ml of 0.1M sodium hydroxide is required to change the colour of the solution to blue.

5.

 Related  substances

Not more than 0.5 %

6.
 Sulphated ash  

Not more than 0.1 %.

7.
 Assay w/w

99.0 to 100.5 %.

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