MEASUREMENT OF STABLE-ISOTOPE ABUNDANCES IN MILK AND MILK INGREDIENTS- A POSSIBLE TOOL FOR ORIGIN ASSIGNMENT AND QUALITY-CONTROL

Citation
Be. Kornexl et al., MEASUREMENT OF STABLE-ISOTOPE ABUNDANCES IN MILK AND MILK INGREDIENTS- A POSSIBLE TOOL FOR ORIGIN ASSIGNMENT AND QUALITY-CONTROL, ZEITSCHRIFT FUR LEBENSMITTEL-UNTERSUCHUNG UND-FORSCHUNG A-FOOD RESEARCH AND TECHNOLOGY, 205(1), 1997, pp. 19-24
Citations number
41
Categorie Soggetti
Food Science & Tenology
ISSN journal
14314630
Volume
205
Issue
1
Year of publication
1997
Pages
19 - 24
Database
ISI
SICI code
1431-4630(1997)205:1<19:MOSAIM>2.0.ZU;2-I
Abstract
Relative carbon and nitrogen stable isotope abundances in total milk r eflect the isotopic composition of the diet fed to the dairy cows; thi s diet and its delta-values depend on geographical and climatic factor s. Milk from regions dominated by grassland typically shows relatively negative delta(13)C-values, while in regions dominated by crop cultiv ation the delta(13)C-values are more positive. The delta(15)N-values a re influenced by factors such as soil conditions, the intensity of agr icultural use and the climate. Casein in authentic milk samples is enr iched in both C-13 and N-15 as compared to total milk, while the whey fraction is slightly enriched in C-13 and depleted of N-15. Th, isotop ic content of milk, casein and whey from one location have been measur ed throughout a period of longer than 1 year; variations are usually n ot greater than 1 parts per thousand. In milk water, the O-18 content was increased by between 2 and 6 parts per thousand as compared to gro und water.