Editing Katal (section)

==Definition==
One katal refers to an amount of enzyme that gives a catalysed rate of conversion of one [[Mole (unit)|mole]] per [[second]].<ref>{{Cite journal|date=2014-05-01|title=Standards for Reporting Enzyme Data: The STRENDA Consortium: What it aims to do and why it should be helpful|journal=Perspectives in Science|language=en|volume=1|issue=1–6|pages=131–137|doi=10.1016/j.pisc.2014.02.012|issn=2213-0209|doi-access=free|last1=Tipton|first1=Keith F.|last2=Armstrong|first2=Richard N.|last3=Bakker|first3=Barbara M.|last4=Bairoch|first4=Amos|last5=Cornish-Bowden|first5=Athel|last6=Halling|first6=Peter J.|last7=Hofmeyr|first7=Jan-Hendrik|last8=Leyh|first8=Thomas S.|last9=Kettner|first9=Carsten|last10=Raushel|first10=Frank M.|last11=Rohwer|first11=Johann|last12=Schomburg|first12=Dietmar|last13=Steinbeck|first13=Christoph}}</ref><ref name=":0">{{Cite journal|last1=Baltierra-Trejo|first1=Eduardo|last2=Márquez-Benavides|first2=Liliana|last3=Sánchez-Yáñez|first3=Juan Manuel|date=2015-12-01|title=Inconsistencies and ambiguities in calculating enzyme activity: The case of laccase|url=http://www.sciencedirect.com/science/article/pii/S0167701215300853|journal=Journal of Microbiological Methods|language=en|volume=119|pages=126–131|doi=10.1016/j.mimet.2015.10.007|pmid=26459230|issn=0167-7012}}</ref> Because this is such a large unit for most enzymatic reactions, the nanokatal (nkat) is used in practice.<ref name=":0" />
:<math alt="katal equals mole per second">\text{kat}=\frac{\text{mol}}{\text{s}}</math>
The katal is not used to express the [[Reaction rate|rate of a reaction]]; that is expressed in units of concentration per second, as [[Mole (unit)|moles]] per [[liter]] per second. Rather, the katal is used to express catalytic activity, which is a property of the catalyst.