Methods of chemical and physical testing for the dairying industry Condensed milk - Determination of sucrose - Polarimetric method
Standards Australia
RECONFIRMATION NOTICE
Technical Committee FT-024 has reviewed the content of this publication and in accordance with Standards Australia procedures for reconfirmation, it has been determined that the publication is still valid and does not require change.
Certain documents referenced in the publication may have been amended since the original date of publication. Users are advised to ensure that they are using the latest versions of such documents as appropriate, unless advised otherwise in this Reconfirmation Notice.
Approved for reconfirmation in accordance with Standards Australia procedures for reconfirmation on 22 November 2016.
The following are represented on Technical Committee FT-024:
Australian Chamber of Commerce and Industry
Australian Institute of Food Science and Technology
Meat and Livestock Australia
National Association of Testing Authorities Australia
National Measurement Institute
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.
| Document Type | Standard |
| Status | Current |
| Publisher | Standards Australia |
| ProductNote | Reconfirmed 09/12/2016. This standard has been reconfirmed in Australia in 2016 and remains current in New Zealand. Reconfirmation Notice 09/12/2016 |
| Committee | FT-024 |
| Supersedes |
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