Caseins -- Determination of " fixed ash " (Reference method)
This standard has been revised by ISO 5544:2008
Covers caseins obtained by acid precipitation or lactic fermentation, ammonium caseinates, their mxtures with rennet casein and with caseinates, and caseins of unknown type. The principle of determination consists in incinerating a test portion at a temperature of 825 +/- 25 degrees centigrade in the presence of magnesium acetate to bind all phosphorus af organic origin, weighing the residue and subtracting the mass of ash originating from the magnesium acetate.
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