TITLE

Follow-up of stable isotope analysis of organic versus conventional milk

AUTHOR(S)
Molkentin, Joachim; Giesemann, Anette
PUB. DATE
October 2010
SOURCE
Analytical & Bioanalytical Chemistry;Oct2010, Vol. 398 Issue 3, p1493
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
nalysis of the stable isotope ratio of carbon ( δC) and α-linolenic acid (C18:3ω3) content in milk fat is a useful indicator of organic milk production. Referring to corresponding measurements, further analyses of stable isotope ratios were performed in 120 samples of conventionally and organically produced whole milk collected from German retailers during a period of 18 months. Conventional milk predominantly exhibited higher δN values than organic milk, the latter of which never exceeded a maximum δN threshold value of 5.50‰. Measurements of δS did not differ significantly between organic and conventional milk. Because δC, in general, is related to maize consumption, δC in milk protein and δC in milk fat were equally suited for authentication of organic milk. Thus, a high correlation ( r = 0.99) was established between δC in milk protein and lipids. Although occurring on different levels in organic and conventional milk, the relatively constant fractionation of carbon isotopes between protein and fat will allow for the advanced detection of adulteration in processed milk products, such as fraudulent combinations of organic milk fat and conventional skim milk. In addition to the strong correlation between C18:3ω3 and δC ( r = −0.91), a mutual dependence was identified between both δC and δN ( r = 0.66) and C18:3ω3 and δN ( r = −0.61). Thus, multi-variable analyses are useful to increase robustness and reduce the number of exceptions in organic milk authentication. Future work involving multivariate statistical analysis can possibly further improve milk authentication in various respects including differentiating between brands of retail milk. [Figure not available: see fulltext.]
ACCESSION #
53476282

 

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