Determining the geographic origin of milk in Australasia using multi-element stable isotope ratio analysis

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• 作者：R.G. Crittenden ; A.S. Andrew ; M. LeFournour ; M.D. Young ; H. Middleton ; R. Stockmann
• 关键词：Milk ; Dairy ; Appellation ; Origin ; Isotopes ; IRMS
• 刊名：International Dairy Journal
• 出版年：2007
• 出版时间：May 2007
• 年：2007
• 卷：17
• 期：5
• 页码：421-428
• 全文大小：316 K

文摘

A pilot study was conducted to evaluate the suitability of multi-element isotope ratio analysis for determining the origin of cows’ milk produced within Australasia. A milk sample from pasture-fed cows was obtained from seven dairying regions in Australia and New Zealand and analysed for the ratios of ¹³C/¹²C, ¹⁵N/¹⁴N, ¹⁸O/¹⁶O, ³⁴S/³²S, and ⁸⁷Sr/⁸⁶Sr. Each milk sample displayed a distinct isotopic fingerprint. Isotope ratios for ¹⁸O/¹⁶O and ¹³C/¹²C, in particular, conformed to predicted isotope fractionation patterns based on the latitude and climate of each region. Relative to skim milk, casein was enriched in ¹³C and ¹⁵N, and depleted of ³⁴S, whereas, predictably, ⁸⁷Sr/⁸⁶Sr ratios remained equivalent in both skim milk and casein. The milk samples from Australasia were considerably enriched in ¹⁸O and ³⁴S compared with reported values for most European dairy products. Overall, multi-element isotopic analysis has good potential for determining the geographic origin of dairy products produced within Australasia.