This International Standard describes a method for the determination of the total milk-clotting activity of bovine
rennet containing only chymosin and bovine pepsin as the active coagulating enzymes on a standard milk
substrate at pH 6,5.
To produce accurate results with this method, test samples of unknown origin are to be checked for the
absence of main milk-clotting enzymes of non-bovine origin by using an appropriate method (e.g. IDF 110B).
This International Standard can also be applied to determine the total milk-clotting activity of
fermentation-produced chymosin.
IDF 157-2007 Referenced Document
ISO 1042 Laboratory glassware - One-mark volumetric flasks
ISO 648 Laboratory glassware - Single-volume pipettes*， 2008-10-01 Update
IDF 157-2007 history
2007IDF 157-2007 Milk -- Determination of total milk-clotting activity of bovine rennets