Atkinson Bonnie L, Blackman Adrian J, Faber Helen
School of Chemistry, University of Tasmania, Sandy Bay Hobart, Tasmania, Australia 7005.
J Agric Food Chem. 2004 Jan 28;52(2):280-7. doi: 10.1021/jf0304425.
Prolonged storage of harvested Tasmanian pyrethrum crop from Tanacetum cinerariaefolium has resulted in substantial losses of the pyrethrin esters due to the environmental conditions in the storage shed. The generation of heat, the presence of moisture and oxygen, and the microbial activity were identified as possible causes. A pyrethrum crop sample was divided up and stored in different conditions relating to these variables, and the pyrethrins content was monitored over time using a standard method. Temperature was determined to be a critical factor in the rate of the degradation of the natural pyrethrins. Moisture, oxygen, and microbial activity unexpectedly did not play a major role in the degradation. An initial rapid loss of the natural pyrethrins was observed before the pyrethrins content stabilized at a loss of around 65%. This suggests that the plant structure may provide chemical or physical protection to the pyrethrins. In all cases, the majority of the loss was attributed to the pyrethrin I and pyrethrin II esters.
由于储存棚内的环境条件，收获的塔斯马尼亚除虫菊（Tanacetum cinerariaefolium）作物长时间储存导致除虫菊酯大量损失。热量的产生、水分和氧气的存在以及微生物活动被确定为可能的原因。将一份除虫菊作物样本分开并在与这些变量相关的不同条件下储存，使用标准方法随时间监测除虫菊素含量。温度被确定为天然除虫菊素降解速率的关键因素。水分、氧气和微生物活动意外地在降解过程中未起主要作用。在除虫菊素含量稳定在约65%的损失之前，观察到天然除虫菊素最初迅速损失。这表明植物结构可能为除虫菊素提供化学或物理保护。在所有情况下，大部分损失归因于除虫菊素I和除虫菊素II酯。
