温室处理后番茄中印楝素 A 及其相关成分的命运。

Fate of azadirachtin A and related azadirachtoids on tomatoes after greenhouse treatment.

机构信息

Dipartimento di Tossicologia, Universita di Cagliari, Cagliari, Italy.

出版信息

J Environ Sci Health B. 2009 Aug;44(6):598-605. doi: 10.1080/10934520902784641.

DOI:10.1080/10934520902784641

PMID:20183068

Abstract

The degradation of the main azadirachtoids on tomatoes was studied after greenhouse treatment. These experiments were carried out at 1 and 5x the concentration recommended by the manufacturer. In all experiments the deposition of azadirachtin A (AZA-A) was below the maximum residue level (MRL). Even if at the highest dose, AZA-A half-life time calculated as pseudo first order kinetic was 1.2 days in agreement with the recommended preharvest interval (PHI) of 3 days. Experiments with a model system showed that sunlight photodegradation is the main factor influencing the rate of disappearance of AZA-A after greenhouse treatment while tomato epicuticular waxes doubled the photodegradation rate of AZA-A in a commercial formulation.

摘要

在温室处理后研究了主要印楝素在番茄上的降解情况。这些实验是在推荐使用浓度的 1 倍和 5 倍下进行的。在所有实验中，印楝素 A（AZA-A）的沉积量均低于最大残留限量（MRL）。即使在最高剂量下，根据推荐的采收前间隔（PHI）3 天计算，AZA-A 的半衰期为 pseudo first order kinetic 的 1.2 天。模型系统实验表明，阳光光降解是影响温室处理后 AZA-A 消失速率的主要因素，而番茄表皮蜡质使 AZA-A 在商业制剂中的光降解速率提高了一倍。