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Journal of library and information science in agriculture ›› 2015, Vol. 27 ›› Issue (8): 160-163.doi: 10.13998/j.cnki.issn1002-1248.2015.08.039

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Conversion of Enzyme Activity unit (non-SI unit) to SI unit for CAT, POD and APX

LIU Chang-lai1, TIAN Ya-ling2, WANG Guo-dong1, ZHENG Yan-yi1, LI Yan-wen1   

  1. 1. Editorial Dept. of Journal of Nanjing Forestry University (Natural Science Edition), Jiangsu Nanjing 210037, China;
    2. Editorial Dept. of China Forestry Science and Technology, Jiangsu Nanjing 210037, China;
  • Received:2015-03-04 Online:2015-08-05 Published:2015-08-06

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Abstract: In order to spread the SI system and change the chaotic situation about the enzyme activity unit of CAT and POD and APX, we downloaded 45 papers published in 2013 and 2014 containing CAT, POD and APX from springer database, and analyzed the catalytic mechanism and the method for determination of enzyme activity and the definition method of enzyme activity about CAT, POD and APX. We found that these enzyme activities of three enzymes were expressed by reduction rate of reactant amount or increasing rate of resultant amount which they catalyzed, and the amount which catalyzed could be detected at a certain wavelength. So through molar extinction coefficient of the reactant or resultant at its certain wavelength, all kinds of enzyme activity unit of CAT and POD and APX could be convert to IS unit by using three formulas, for example, extinction coefficient for hydrogen peroxide was 43.6 L/ (mol·cm) at 240 nm, for tetraguaiacol was 26.6 L/ (mmol·cm) at 470 nm, extinction coefficient for ascorbic acid was 2.8 L/ (mmol·cm) at 290 nm.

Key words: CAT

CLC Number: 

  • G250
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