There are described a method for enriching the anabolic p-hydroxyphenylpyruvate dioxygenases from plant tissues and a method by means of which the enzymatic activity of the enzyme can be measured in a simple manner without complete purification of the enzyme being necessary. The invention furthermore describes an assay system for identifying inhibitors of p-hydroxyphenylpyruvate dioxygenase from plants, in which an enriched HPPD from plants is incubated with a test substrate to be examined and the enzymatic activity of the enzyme is determined in comparison with the activity of the uninhibited enzyme. The invention furthermore describes the novel herbicidal active substances of the formula (I) ##STR1## which were found using the assay method according to the invention.
描述了一种从植物组织中富集合成的p-羟基
苯丙酮酸双氧酶的方法,以及一种通过该方法可以简单测量该酶的酶活性而无需完全纯化酶的方法。此外,该发明描述了一种用于识别植物中p-羟基
苯丙酮酸双氧酶
抑制剂的测定系统,其中将从植物中富集的HPPD与待检测的测试底物孵育,然后比较测定酶的酶活性与未受抑制的酶的活性。此外,该发明还描述了根据该发明的测定方法发现的具有以下结构式(I)的新型除草活性物质。