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Since the ban on growth-promoting antibiotics throughout the EU essential oils are used increasingly as feed additives. In order to ensure a reliable authenticity assessment of those oils appropriate methods were developed. 2H/1H−, 13C/12C− and 18O/16O isotope ratio mass spectrometric analysis of carvacrol from origanum and savory oil, thymol from thyme oil and trans-anethole from fennel oil in combination...
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