AINP on Pesticide Residues, BCKV, West Bengal 741235, India.
AINP on Pesticide Residues, BCKV, West Bengal 741235, India.
Food Chem. 2018 Jul 1;253:88-92. doi: 10.1016/j.foodchem.2018.01.132.
In order to examine the residues of thiacloprid (90 and 180 g a.i./ha) and deltamethrin (10 and 20 g a.i./ha) in fresh tea leaves, made tea and tea infusion, field experiments were conducted at three different locations viz. Kamalpur tea estate, Darjeeling; West Bengal, Teok tea Estate and AAU, Jorhat; Assam in India. Regardless of location and doses, residues of both the insecticides dissipated following first order kinetics. The half-life of Thiacloprid (4.93-5.38 days) was longer than that of deltamethrin (1.78-1.94 days). Processing of green tea leaves reduced the residue level of thiacloprid and deltamethrin in made tea. No residues of both these insecticides could be detected in tea infusion. With respect to the phenolic distribution in tea, a marked increase in total catechin monomers with thiacloprid and greater accumulation of EGCG and ECG (indices of phenol quality) with deltamethrin were observed.
为了检测噻虫啉（90 和 180 g ai/ha）和溴氰菊酯（10 和 20 g ai/ha）在新鲜茶叶、制成茶和茶浸出液中的残留量，在印度西孟加拉邦的卡马尔普尔茶园、大吉岭的特奥克茶园和阿萨姆邦的 AAU 进行了田间试验。无论在哪个地点和剂量下，这两种杀虫剂的残留量都遵循一级动力学规律消散。噻虫啉的半衰期（4.93-5.38 天）长于溴氰菊酯（1.78-1.94 天）。绿茶叶片的加工过程降低了制成茶中噻虫啉和溴氰菊酯的残留水平。在茶浸出液中无法检测到这两种杀虫剂的残留。就茶叶中的酚类分布而言，用噻虫啉处理后总儿茶素单体显著增加，用溴氰菊酯处理后 EGCG 和 ECG（酚类质量指标）积累更多。
