Degradation Dynamics and Dietary Risk Assessments of Two Neonicotinoid Insecticides during Lonicera japonica Planting, Drying, and Tea Brewing Processes.
The degradation dynamics and dietary risk assessments of thiamethoxam and thiacloprid during Lonicera japonica planting, drying, and tea brewing processes were systematically investigated using high-performance liquid chromatography. The half-lives of thiamethoxam and thiacloprid were 1.0-4.1 d in the honeysuckle flowers and leaves, with degradation rate constants k ranging from -0.169 to -0.696. The safety interval time was 7 d. The sun- and oven-drying (70 °C) percent digestions were 59.4-81.0% for the residues, which were higher than the shade- and oven-drying percentages at lower temperatures (30, 40, 50, and 60 °C, which ranged from 37.7% to 57.0%). The percent transfers of thiamethoxam and thiacloprid were 0-48.4% and 0-25.2%, respectively, for the different tea brewing conditions. On the basis of the results of this study, abiding by the safety interval time is important, and using reasonable drying methods and tea brewing conditions can reduce the transfer of thiamethoxam and thiacloprid to humans.
School of Plant Protection, Provincial Key Laboratory for Agri-Food Safety, and ‡School of Resource & Environment, Provincial Key Laboratory for Agri-Food Safety, Anhui Agricultural University , Hefei 230036, China.
Qingkui
Q
Fang
School of Plant Protection, Provincial Key Laboratory for Agri-Food Safety, and ‡School of Resource & Environment, Provincial Key Laboratory for Agri-Food Safety, Anhui Agricultural University , Hefei 230036, China.
Yanhong
Y
Shi
School of Plant Protection, Provincial Key Laboratory for Agri-Food Safety, and ‡School of Resource & Environment, Provincial Key Laboratory for Agri-Food Safety, Anhui Agricultural University , Hefei 230036, China.
Haiqun
http://orcid.org/0000-0001-9381-8896
H
Cao
School of Plant Protection, Provincial Key Laboratory for Agri-Food Safety, and ‡School of Resource & Environment, Provincial Key Laboratory for Agri-Food Safety, Anhui Agricultural University , Hefei 230036, China.
Zhou
Z
Tong
School of Plant Protection, Provincial Key Laboratory for Agri-Food Safety, and ‡School of Resource & Environment, Provincial Key Laboratory for Agri-Food Safety, Anhui Agricultural University , Hefei 230036, China.
Jinjing
J
Xiao
School of Plant Protection, Provincial Key Laboratory for Agri-Food Safety, and ‡School of Resource & Environment, Provincial Key Laboratory for Agri-Food Safety, Anhui Agricultural University , Hefei 230036, China.
Min
M
Liao
School of Plant Protection, Provincial Key Laboratory for Agri-Food Safety, and ‡School of Resource & Environment, Provincial Key Laboratory for Agri-Food Safety, Anhui Agricultural University , Hefei 230036, China.
Xiangwei
http://orcid.org/0000-0003-3589-4051
X
Wu
School of Plant Protection, Provincial Key Laboratory for Agri-Food Safety, and ‡School of Resource & Environment, Provincial Key Laboratory for Agri-Food Safety, Anhui Agricultural University , Hefei 230036, China.
Rimao
R
Hua
D001628:Beverages / Q000032:analysis*; D003296:Cooking; D005506:Food Contamination / Q000032:analysis*; D006801:Humans; D007306:Insecticides / Q000737:chemistry*; D031239:Lonicera / Q000737:chemistry* / Q000254:growth & development; D000073943:Neonicotinoids; D009574:Nitro Compounds / Q000737:chemistry*; D010078:Oxazines / Q000737:chemistry*; D010573:Pesticide Residues / Q000032:analysis*; D011725:Pyridines / Q000737:chemistry*; D018570:Risk Assessment; D000077922:Thiamethoxam; D013843:Thiazines / Q000737:chemistry*; D013844:Thiazoles / Q000737:chemistry*
D007306:Insecticides; D000073943:Neonicotinoids; D009574:Nitro Compounds; D010078:Oxazines; D010573:Pesticide Residues; D011725:Pyridines; D013843:Thiazines; D013844:Thiazoles; D000077922:Thiamethoxam; C417209:thiacloprid
Lonicera japonica; degradation dynamics; dietary risk assessment; drying method; neonicotinoid insecticide; tea brewing condition