代谢
研究了丙草胺在植物中的代谢命运。这种化合物在土壤中转化为3,3',4,4'-四氯偶氮苯的过程是由土壤过氧化物酶催化的。这个反应在存在结晶状辣根过氧化物酶的情况下也会发生。在一些植物中,丙草胺迅速水解生成3,4-二氯苯胺。准备了稗草的粗提物、新鲜辣根根、水稻和商业纯化的结晶状辣根酶。推断出,过氧化物酶之间底物特异性的差异可能是某些植物无法将苯胺转化为偶氮化合物(如将3,4-二氯苯胺转化为3,3',4,4'-四氯偶氮苯)的原因。... 通过将稗草上清液或辣根过氧化物酶与醋酸缓冲液、过氧化氢和各种苯胺底物混合并反应30分钟,制备了单氯和二氯苯胺的酶催化产物。用新鲜辣根和辣根过氧化物酶制备的样品与所有苯胺底物反应生成了产物,除了2,5-和2,6-二氯苯胺。稗草和水稻植物仅与研究的二氯苯胺底物中的2,3-二氯苯胺反应生成产物。/二氯苯胺/
The metabolic fate of propanil in plants was studied. The conversion of this compound in soil to 3,3',4,4'-tetrachloroazobenzene is catalyzed by soil peroxidases. This reaction also occurs in the presence of crystalline horseradish peroxidase. In some plants propanil is rapidly hydrolyzed to give 3,4-dichloroaniline. Crude extracts of barnyard grass, fresh horseradish root, rice & commercially purified crystalline horseradish enzyme were prepared. It was inferred that the differences in substrate specificity among peroxidases may account for the failure of some plants to convert the aniline to azo compounds such as in the conversion to 3,4-dichloroaniline to 3,3',4,4'-tetrachloroazobenzene. ... Enzymatically catalyzed products of mono- & dichloroanilines were prepared by mixing barnyard grass supernatants or horseradish peroxidase with an acetic buffer, hydrogen peroxide & various aniline substrates & allowed to react for 30 min. Preparations made from fresh horseradish & from horseradish peroxidase gave products with all anilines except 2,5- & 2,6-dichloroanilines. Barnyard grass & rice plants gave products only with 2,3-dichloroaniline of the dichloroaniline substrates studied. /Dichloroanilines/
来源:Hazardous Substances Data Bank (HSDB)