Unit "katal" for catalytic activity (IUPAC technical report)
Unit "katal" for catalytic activity (IUPAC technical report)
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DOI：
10.1351/pac200173060927
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发表时间：
2001-06-01
影响因子：
1.8
通讯作者：
Dybkaer, R
中科院分区：
文献类型：
--
作者：
Dybkaer, R
表示催化剂的量通常通过评估其催化效果来最方便地进行。在零级动力学下，特定反应的催化转化率是恒定的，并且与存在的催化剂的物质的浓度成比例。将数量类型的“催化活性”定义为通过催化转化率测量的催化剂的性质，相关SI单位是摩尔每秒。在IUPAC、国际临床化学与实验室医学联合会（IFCC）、国际生物化学与分子生物学联合会（IUBMB）和世界卫生组织（WHO）进行了深入讨论后，IFCC向国际度量衡委员会（CIPM）提交了一份关于特殊名称“katal”（符号kat）的请愿书，当用于测量催化活性时，表示“摩尔每秒”。国际计量大会（CGPM）通过第12（1999）号决议批准了这一请求。此后，相干SI单位katal = 1 mol . s（-1）应取代离系统IUB单位“（酶）单位”= 1 μ mol。min（-1）约为16.67 nkat。因此，通过反应条件的适当定义，催化活性和衍生物种类的量的结果在计量学上可追溯到SI。
Expressing the amount of a catalyst is often most conveniently done by assessing its catalytic effect. Under zero-order kinetics the catalyzed rate of conversion for a specified reaction is constant and proportionate to the amount-of-substance concentration of catalyst present. Defining the kind-of-quantity "catalytic activity" as a property of the catalyst measured by the catalyzed rate of conversion, the coherent SI unit is mole per second. Following thorough discussions in the IUPAC, the International Federation of Clinical Chemistry and Laboratory Medicine (IFCC), the International Union of Biochemistry and Molecular Biology (IUBMB), and the World Health Organization (WHO), a petition was presented by the IFCC to the International Committee for Weights and Measures (CIPM) on a special name "katal", symbol kat, for "mole per second" when used in measuring catalytic activity. This request was granted by the General Conference for Weights and Measures (CGPM) by Resolution 12 (1999). Hereafter, the coherent SI unit katal = 1 mol . s(-1) should replace the off-system IUB unit "(enzyme) unit" = 1 mu mol . min(-1) approximate to 16.67 nkat. Thus, by suitable definition of reaction conditions, results for catalytic activity and derivative kinds-of-quantity are metrologically traceable to the SI.