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ID 248
Eprint ID
248
FullText URL
Title Alternative
An Evaluation of the Tetra-Serum Hydrometric Method for Detecting Added Water in Milk
Author
Kataoka, Kei
Kawase, Kenzo
Nakae, Toshitaka
Abstract
The Tetra-serum hydrometric method as the official routine test for detecting added water in milk was evaluated with special reference to its accuracy and detailed procedure. In experiments with raw milk samples collected in the southern region of Okayama prefecture, it has been shown that the faultiness of turbid serum occurred frequently in the case of the official method is due to an insufficient concentration of acetic acid for preparing milk serum. This fault was improved not by the technical modification for separating milk serum, but by the use of 35% acetic acid instead of 20% in the official method. From 41 samples of normal milk serum prepared by the modified method, the average value and standard deviation of the specific gravity were calculated. The value is 1.0304 ±0.00132. Regression equation of the specific gravity of milk serum on added water ratio was obtained from the experiment of adding water to authenticated milk samples. It was concluded that milk serum samples having specific gravity not over 1.0260 may possibly contain more than 10 per cent of added water.
Published Date
1969
Publication Title
岡山大学農学部学術報告
Publication Title Alternative
Scientific Reports of the Faculty of Agriculture Okayama University
Volume
volume33
Issue
issue1
Publisher
岡山大学農学部
Publisher Alternative
Faculty of Agriculture, Okayama University
Start Page
51
End Page
55
ISSN
0474-0254
NCID
AN00033029
Content Type
Departmental Bulletin Paper
language
日本語
File Version
publisher
Refereed
False
Eprints Journal Name
srfa