Pyrrolizidine alkaloids (PAs) and their N-oxide (PANOs), as emerging environmental pollutants and chemical hazards in food, have become the focus of global attention. PAs/PANOs enter crops from soil and reach edible parts, but knowledge about their uptake and transport behavior in crops is currently limited. In this study, we chose tea (Camellia sinensis L.
View Article and Find Full Text PDFPyrrolizidine alkaloids (PAs) and pyrrolizidine alkaloid N-oxides (PANOs) are toxic secondary metabolites in plants, and one kind of main exogenous pollutants of tea. Herein, the dissipation pattern and conversion behavior of PAs/PANOs were investigated during tea manufacturing and brewing using ultra high-performance liquid chromatography tandem mass spectrometry. Compared with PAs (processing factor (PF) = 0.
View Article and Find Full Text PDFGibberellic acid (GA) is widely applied in agriculture and food worldwide. Profiling the degradation products and their formation pattern under stress are helpful for deeply understanding GA regulating plant physiology and GA safety in agricultural crops. This study firstly investigated the degradation behavior of GA.
View Article and Find Full Text PDFCartap applied widely in agricultural crops and tea plants is readily degraded into nereistoxin, resulting in a longer residual period and higher exposure risk to humans. The photolysis kinetics of cartap and nereistoxin in water and tea beverages was firstly investigated to explore the effect and mechanism of pesticide residue removal. Cartap and nereistoxin could be effectively photolyzed by ultraviolet and their photolysis rate increased with light intensity increasing.
View Article and Find Full Text PDFPyrethroid pesticides are widely used on tea plants, and their residues of high frequency and concentration have received great attention. Until recently, the residues of typical metabolites of pyrethroid pesticides in tea were unknown. Herein, a modified "quick, easy, cheap, effective, rugged and safe" (QuEChERS) method for the determination of three typical metabolites of pyrethroid pesticides in tea, using ultra performance liquid chromatography tandem mass spectrometry, was developed.
View Article and Find Full Text PDFAs a widely used plant growth regulator, the gibberellic acid (GA) residue in tea has potential risk for human health. Herein, the degradation of GA and its conversion into main metabolites were investigated during tea planting, manufacturing, and brewing using ultrahigh-performance liquid chromatography tandem mass spectrometry. The metabolite iso-GA was first discovered during the tea production chain and identified using Q-Exactive Orbitrap mass spectrometry.
View Article and Find Full Text PDFJ Chromatogr B Analyt Technol Biomed Life Sci
July 2020
Trace plant hormones play an important role in tea growth, development and quick response to biotic and abiotic stresses. However, lack of a sensitive method limits the research on plant hormone regulation for tea quality and yields. Herein, a highly sensitive method was developed using ultra high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) for profiling and quantification of 13 acidic phytohormones and their analogues, including auxins, abscisic acid and gibberellins in fresh tea leaves.
View Article and Find Full Text PDFThere are few studies for risk assessment of cartap and its metabolites, although cartap is easily transformed into metabolites which could induce higher toxicity. This study aimed to investigate the dissipation pattern of cartap and its metabolites during tea planting, manufacturing and brewing for evaluating the safety of cartap pesticide. Cartap metabolites were identified using Q-Exactive Orbitrap mass spectrometry.
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