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Food Chem

Title:		"Authenticating teas using multielement signatures, strontium isotope ratios, and volatile compound profiling"
Author(s):		Reyrolle M; Bareille G; Epova EN; Barre J; Berail S; Pigot T; Desauziers V; Gautier L; Le Bechec M;
Address:		"Universite de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IMT Mines Ales, IPREM, Pau, France; Institut des sciences analytiques et de Physicochimie pour l'environnement et les Materiaux, UMR5254, Helioparc, 2 avenue du President Angot, 64053, Pau cedex 9, France. Advanced Isotopic Analysis (A.I.A.), Helioparc, 2 avenue du President Angot, 64000, Pau, France. T Edition, 63 rue Vercingetorix, 75014 Paris, France. Universite de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IMT Mines Ales, IPREM, Pau, France; Institut des sciences analytiques et de Physicochimie pour l'environnement et les Materiaux, UMR5254, Helioparc, 2 avenue du President Angot, 64053, Pau cedex 9, France. Electronic address: mickael.lebechec@univ-pau.fr"
Journal Title:		Food Chem
Year:		2023
Volume:		20230505
Issue:
Page Number:		136271 -
DOI:		10.1016/j.foodchem.2023.136271
ISSN/ISBN:		1873-7072 (Electronic) 0308-8146 (Linking)
Abstract:		"High value food products are subject to adulterations and frauds. This study aimed to combine, in our knowledge for the first time, inorganic chemical tracers (multi-elements and Sr isotopy) with volatile organic compound (VOCs) to discriminate the geographic origin, the varieties and transformation processes to authenticate 26 tea samples. By measuring Sr isotope ratio using the multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS), 6 out of 11 regions were successfully discriminated. The combination with the ICP-MS inorganic pattern allowed to discriminate 4 more regions with a significance level of 0.05. VOCs fingerprints, obtained with selected ion flow tube mass spectrometer (SIFT-MS), were not correlated with origin but with the cultivar and transformation processes. Green, oolong, and dark teas were clearly differentiated, with hexanal and hexanol contributing to the discrimination of oxidation levels. With this multi-instrumental approach, it is possible to certify the geographical origin and the tea conformity"
Keywords:		*Strontium Isotopes/analysis Mass Spectrometry/methods Spectrum Analysis Isotopes/chemistry *Volatile Organic Compounds/analysis Tea/chemistry Authenticity of food products Inorganic pattern Sr isotope ratio Tea Traceability Volatile organic compounds pro;
Notes:		"MedlineReyrolle, Marine Bareille, Gilles Epova, Ekaterina N Barre, Julien Berail, Sylvain Pigot, Thierry Desauziers, Valerie Gautier, Lydia Le Bechec, Mickael eng England 2023/05/12 Food Chem. 2023 Oct 15; 423:136271. doi: 10.1016/j.foodchem.2023.136271. Epub 2023 May 5"