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The oxygen heterocyclic compounds (coumarins, psoralens and polymethoxylated flavones) present in the non-volatile residue of the essential oils of Mandarin, Sweet Orange, Bitter Orange, Bergamot and Grapefruit were analysed with an HPLC/API/MS system equipped with an APcI probe in positive mode. The use of hyphenated techniques, such as LC/MS provides a great information about the content and nature...
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