ANNEX IIMethods of analysis7
1.Determination of protein content
The protein content is taken to mean the nitrogen content multiplied by the factor 6.25. The nitrogen content must be determined according to ISO method 937-1978.
2.Determination of water content in products falling within CN codes 1601 and 1602
The water content must be determined according to ISO method 1442-1973.
3.Calculation of extraneous water content
The extraneous water content is given by the formula: a – 4b, in which:
- a
water content,
- b
protein content.
4.Determination of collagen content
The collagen content is taken to mean the hydroxyproline content multiplied by the factor 8. The hydroxyproline content must be determined according to ISO method 3496-1978.