1 H HR-MAS NMR chemical profile and chemometric analysis as a tool for quality control of different cultivars of green tea (Camellia sinensis).

Autor: de Fátima C Santos M; NMR Laboratory, Department of Chemistry, Federal University of Paraná, 81530-100 Curitiba, PR, Brazil. Electronic address: fatima.mcs2529@gmail.com., Rech KS; NMR Laboratory, Department of Chemistry, Federal University of Paraná, 81530-100 Curitiba, PR, Brazil., Dutra LM; NMR Laboratory, Department of Chemistry, Federal University of Paraná, 81530-100 Curitiba, PR, Brazil., Menezes LRA; NMR Laboratory, Department of Chemistry, Federal University of Paraná, 81530-100 Curitiba, PR, Brazil., da C Santos AD; NMR Laboratory, Department of Chemistry, Federal University of Amazonas, 69077-000 Manaus, AM, Brazil., Nagata N; NMR Laboratory, Department of Chemistry, Federal University of Paraná, 81530-100 Curitiba, PR, Brazil., Stefanello MÉA; NMR Laboratory, Department of Chemistry, Federal University of Paraná, 81530-100 Curitiba, PR, Brazil., Barison A; NMR Laboratory, Department of Chemistry, Federal University of Paraná, 81530-100 Curitiba, PR, Brazil.
Jazyk: angličtina
Zdroj: Food chemistry [Food Chem] 2023 May 15; Vol. 408, pp. 135016. Date of Electronic Publication: 2022 Nov 22.
DOI: 10.1016/j.foodchem.2022.135016
Abstrakt: Green tea is a product obtained from the processing of fresh leaves of Camellia sinensis (L.) O. Kuntze species. In this study, the influence of climatic parameters on the chemical composition of green tea cultivars ('Yabukita' and 'Yutakamidori') over the harvest was evaluated using HR-MAS NMR. 'Yabukita' showed higher concentrations of epicatechin while higher amounts of theanine and caffeine were found in 'Yutakamidori'. The decline of theanine was associated with high average maximum temperature and solar radiation index, this latter also seemed to be responsible for relevant changes in epicatechin concentrations. It was not possible to associate any trend between climatic parameters and caffeine concentration. Fluctuations in linolenic acid concentration were monitored during the harvest period and were associated with the plant's defense mechanism. Monitoring of green tea over seasons and correlating the fluctuations of compounds to climatic parameters might become an efficient strategy for establishing quality standards for green teas.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2022 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: