Standard for mevinphos active constituent

Effective Date: 
1 July 2004
1. Description: 

the material shall consist of mevinphos together with related manufacturing impurities, and shall be a clear liquid, light yellow to orange in colour, free from extraneous impurities or added modifying agents.

2. Common Name: 
3. Chemical Name (IUPAC): 

2-methoxycarbonyl-1-methylvinyl dimethyl phosphate

4. CAS Number: 
5. Identity test: 
identity of the active constituent must be established by one or more of the following methods: spectroscopic tests (IR spectrum, NMR, mass spectra), Chromatography (HPLC or GC retention time with reference compound) or any other suitable test method.
6. Composition: 

6.1 Active constituent: the sum of the E-isomer and Z-isomer content is shall not be less than 800 g/kg; the minimum content of E-isomer shall be 630 g/kg and Z-isomer shall be 170 g/kg.

7. Analytical methods: 
  • The analytical method used for the determination of the active constituent and toxicological significant impurities must be validated in accordance with the APVMA guidelines for the validation of analytical methods
  • The APVMA guidelines on validation of analytical methods state that 'Analytical methods described in CIPAC handbooks and AOAC International Manual, and in recognized pharmacopoeias [BP, BP (Vet), Ph Eur and USP] for a particular active constituent or formulation are regarded as validated and do not require revalidation'. However, the suitability of these methods must be verified under actual conditions of use ie, the selectivity and accuracy of the method should be demonstrated for the published method when applied to the relevant sample matrix and laboratory conditions.
  • When a CIPAC or AOAC method is used for the assay of an active constituent in a bulk active constituent, there is no matrix. The registrants need to check the specificity of the method to ensure there is no interference from impurities or degradation products. However, determination of accuracy of the method is not required as there is no potential for the product matrix to have an effect on the determination of the active constituent. However, when a CIPAC or AOAC method is used for the assay of an active constituent in a formulated product, determination of both specificity and accuracy is required as the matrix is relevant in formulated products (formulated products have different composition and quantities of excipients).
  • Unless the scope of the collaborative method (CIPAC and AOAC) also includes toxicologically significant impurities in the active constituent, validation data for impurities are required.



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