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Online Gas Chromatography Combustion/Pyrolysis− Isotope Ratio Mass Spectrometry (HRGC-C/P-IRMS) of (±)-Dihydroactinidiolide from Tea (Camellia sinensis) and Rooibos Tea (Aspalathus linearis)

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dc.contributor.author Caja López, María del Mar spa
dc.contributor.author Preston, Christina spa
dc.contributor.author Menzel, Michael spa
dc.contributor.author Kempf, Michael spa
dc.contributor.author Schreier, Peter spa
dc.date.accessioned 2013-11-27T17:26:32Z
dc.date.available 2013-11-27T17:26:32Z
dc.date.issued 2009 spa
dc.identifier.citation Caja-López, M. M., Preston, C., Menzel, M., Kempf, M., & Schreier, P. (2009). Online gas chromatography combustion/pyrolysis− isotope ratio mass spectrometry (HRGC-C/P-IRMS) of (±)-dihydroactinidiolide from tea (camellia sinensis) and rooibos tea (aspalathus linearis). Journal of Agricultural and Food Chemistry, 57(13), 5899-5902. spa
dc.identifier.uri http://hdl.handle.net/11268/817
dc.description.abstract Online capillary gas chromatography-isotope ratio mass spectrometry in both the combustion and the pyrolysis modes (HRGC-C/P-IRMS) was employed to perform authentication studies of the flavoring agent (+/-)-dihydroactinidiolide. Thus, the delta(13)C(V-PDB) and delta(2)H(V-SMOW) values of synthetic (ex synthetic beta-ionone and natural beta-carotene) as well as enzymatically (ex synthetic and natural beta-carotene) produced references were studied in comparison with those of the natural substance isolated from black (n = 17) and green teas (n = 6) ( Camellia sinensis ) as well as Rooibos tea ( Aspalathus linearis ) (n = 7). The isotope values determined for both the synthetic and enzymatically produced samples of (+/-)-dihydroactinidiolide reflected the influence of the origin of their educts. Hence, in cases when synthetic educts were used, the delta(13)C(V-PDB) and delta(2)H(V-SMOW) values ranged from -27.0 to -28.4 per thousand and from -28 to -169 per thousand, respectively, whereas the use of natural educts led to ranges from -30.3 to -31.6 per thousand and from -154 to -228 per thousand, respectively. As to the tea samples, delta(13)C(V-PDB) and delta(2)H(V-SMOW) values ranging from -29.0 to -34.1 per thousand and from -153 to -274 per thousand, respectively, were recorded for (+/-)-dihydroactinidiolide from black and green teas, whereas that from Rooibos tea showed (2)H/(1)H ratios ranging from -189 to -210 per thousand as well as slightly enriched values in the (13)C/(12)C ratios ranging from -24.4 to -27.1 per thousand. spa
dc.language.iso eng spa
dc.title Online Gas Chromatography Combustion/Pyrolysis− Isotope Ratio Mass Spectrometry (HRGC-C/P-IRMS) of (±)-Dihydroactinidiolide from Tea (Camellia sinensis) and Rooibos Tea (Aspalathus linearis) spa
dc.type article spa
dc.description.impact 2.469 JCR (2009) Q1, 2/45 Agriculture, multidisciplinary, 10/64 Chemistry, applied, 10/118 Food science & technology spa
dc.identifier.doi 10.1021/jf9009125 spa
dc.rights.accessRights closedAccess en
dc.subject.unesco Nutrición spa
dc.peerreviewed Si spa


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