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Metabolism of 4-Chloro-2-Methylphenoxyacetic Acid by Soil Bacteria

机译：土壤细菌对4-氯-2-甲基苯氧基乙酸的代谢

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A microorganism capable of degrading 4-chloro-2-methylphenoxyacetic acid (MCPA) was isolated from soil and identified as Flavobacterium peregrinum. All of the chlorine of MCPA was released as chloride, and the carboxyl-carbon was converted to volatile products by growing cultures of the bacterium, but a phenol accumulated in the medium. The phenol was identified as 4-chloro-2-methylphenol on the basis of its gas chromatographic and infrared characteristics. Extracts of cells of F. peregrinum and of a phenoxyacetate-metabolizing Arthrobacter sp. dehalogenated MCPA and several catechols but not 4-chloro-2-methylanisole. The Arthrobacter sp. cell extract was fractionated, and an enzyme preparation was obtained which catalyzed the conversion of MCPA to 4-chloro-2-methylphenol. The latter compound was not metabolized unless reduced nicotinamide adenine dinucleotide phosphate was added to the fractionated extract. The phenol in turn was apparently oxidized to a catechol by components of the enzyme preparation.
机译：从土壤中分离出能够降解4-氯-2-甲基苯氧基乙酸（MCPA）的微生物，并将其鉴定为百日草黄杆菌。 MCPA的所有氯均以氯化物的形式释放出来，并且通过细菌的培养使羧基碳转化为挥发性产物，但苯酚却在培养基中积累。根据其气相色谱和红外特性，该酚被鉴定为4-氯-2-甲基苯酚。百日草和苯氧乙酸代谢节杆菌的细胞提取物。使MCPA和几种儿茶酚脱卤，但不能去除4-氯-2-甲基茴香醚。关节杆菌将细胞提取物分级分离，获得酶制剂，其催化MCPA转化为4-氯-2-甲基苯酚。除非将还原的烟酰胺腺嘌呤二核苷酸磷酸加入到分馏的提取物中，否则后一种化合物不被代谢。苯酚显然被酶制剂的成分氧化为邻苯二酚。

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