AS 2300.5.2-1991

This Standard sets out a polarimetric method for determining the sucrose content of sweetened condensed milk of normal composition which has been prepared from whole, partially skimmed or skimmed milk and sucrose only, and which contains no altered sucrose.

This Standard sets out a polarimetric method for determining the sucrose content of sweetened condensed milk of normal composition which has been prepared from whole, partially skimmed or skimmed milk and sucrose only, and which contains no altered sucrose.NOTE: It has been found by investigation that sucrose is generally present in an unchanged condition in freshly manufactured product, but that it is sometimes partly altered during storage, and that the altered sucrose is present, in cases that have been examined, not as invert sugar but as a mixture of glucose, fructose and laevan.The presence of the laevan interferes with the polarimetric and other procedures usually applied to the determination of sucrose.If the presence of altered sucrose is suspected because of the age of the product, it may be detected with a modified Barfoed reagent (copper acetate and acetic acid) using specified test conditions under which there is no reduction of the copper by sucrose, and the effect of the lactose is negligible, whilst the effects of glucose and fructose remain at a high level. The Barfoed process will detect as little as 0.1 percent of the invert sugars, glucose and fructose. If no significant sucrose alteration is detected, the method described below for determining sucrose should be used. If the alteration is significant, the method described in The Analyst* is recommended for the determination of the original sucrose content of the sample.

Amendment 1 to AS 2300.5.2-1991 see DR 96360 Reconfirmed 2016. First published as part of AS N48-1965. AS N48-1965 revised and redesignated in part as AS 2300.5.2-1991. Incorporating Amdt 1-1997.