Dissipation pattern and conversion of pyrrolizidine alkaloids (PAs) and pyrrolizidine alkaloid N-oxides (PANOs) during tea manufacturing and brewing. (1st October 2022)

• Record Type: Journal Article
• Authors: Han, Haolei; Jiang, Changling; Wang, Chen; Lu, Yuting; Wang, Ziqi; Chai, Yunfeng; Zhang, Xiangchun; Liu, Xin; Lu, Chengyin; Chen, Hongping
• Is Part Of: Food chemistry. Volume 390(2022)
• Publication Date: 2022-10-01
• Subjects: Tea -- Pyrrolizidine alkaloids -- Pyrrolizidine alkaloid N-oxides -- Dissipation pattern -- Conversion; Food -- Analysis -- Periodicals; Food -- Composition -- Periodicals; 664
• DOI: 10.1016/j.foodchem.2022.133183
• Languages: English
• ISSNs: 0308-8146

Abstract

Highlights: Dissipation patterns of PAs/PANOs in tea were investigated. Higher degradation rates of PANOs than PAs were observed during tea manufacturing. PANOs would be converted to corresponding PAs during tea manufacturing. PANOs showed higher transfer rates than those of PAs during tea brewing. Abstract: Pyrrolizidine 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) = 0.73–1.15), PANOs had higher degradation rates (PF = 0.21–0.56) during tea manufacturing, and drying played the most important role in PANOs degradation. Moreover, PANOs were firstly discovered to be converted to corresponding PAs especially in the time-consuming (spreading of green tea manufacturing and withering of black tea manufacturing) and high-temperature tea processing (drying). Moreover, higher transfer rates of PANOs (≥75.84%) than that of PAs (≤56.53%) were observed during tea brewing. Due to higher toxicity of PAs than PANOs, these results are conducive to risk assessment and pollution control of PAs/PANOs in tea.