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BACKGROUNDTwenty genuine samples of industrially cold‐pressed sweet orange essential oils, were analysed by gas chromatography–combustion‐isotope ratio mass spectrometry to determine the values of the carbon isotope ratios (δ13CVPDB) of selected volatiles and assess the corresponding range of authenticity. Successively, four commercial orange‐flavoured products were analysed under identical conditions...
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