Katal

format_list_bulleted Contenido keyboard_arrow_down

ImprimirCitar

The katal (symbol kat) is a unit derived from the International System of Units to measure catalytic activity, especially in the fields of medicine and biochemistry. It is defined as the catalytic activity responsible for the transformation of one mole of compound per second.

The name katal has been in use for 30 years, but only became official during the 21st General Conference on Weights and Measures in 1999.

In enzyme kinetics, it is the amount of enzyme needed to transform one mole of substrate per second. 1 katal equals 60 x 10⁶ units of enzyme activity. As it is a very large unit, its microkatal (μkat) and nanokatal (nkat) submultiples are usually used.

Definition

A katal refers to an enzyme catalyzing the reaction of one mole of substance per second. Since this is a large unit for many enzymatic reactions, the nanokatal (nkat) is used in practice.

${displaystyle {text{kat}}={frac {text{mol}}{text{s}}}}$

The katal is not used to express the reason for a reaction; which is expressed in units of concentration per second, such as moles per liter per second. Rather, the katal is used to express catalytic activity, which is a property of catalysis.

IF multiples

Multiple SI katal (kat)
Submultiplos			Multiple
Value	Symbol SI	Name	Value	Symbol SI	Name
10−1 kat	dkat	decikatal	101 kat	dakat	decakatal
10−2 kat	ckat	centikatal	102 kat	hkat	hectokatal
10−3 kat	mkat	millikatal	103 kat	kkat	kilokatal
10−6 kat	μkat	microkatal	106 kat	Mkat	megakatal
10−9 kat	nkat	nanokatal	109 kat	Gkat	gigakatal
10−12 kat	pkat	picokatal	1012 kat	Tkat	terakatal
10−15 kat	fkat	femtokatal	1015 kat	Pkat	petakatal
10−18 kat	akat	attokatal	1018 kat	Ekat	exakatal
10−21 kat	zkat	zeptokatal	1021 kat	Zkat	zettakatal
10−24 kat	ykat	yoctokatal	1024 kat	Ykat	yottakatal

History

The General Conference on Weights and Measures and other international organizations recommend the use of the katal. I replace the non-SI enzyme unit of catalytic activity. The enzyme unit is even more commonly used than the katal, especially in biochemistry. The adoption of the katal has been slow.

Origin

The name "katal" It has been used for decades. The first proposal to make it an SI unit came in 1978, and it became an official SI unit in 1999. The name comes from the ancient Greek κατάλυσις (katalysis), meaning "dissolution&#34.;, the word "catalysis" itself is a Latinized form of the Greek word.

Contenido relacionado

Más resultados...