What unit is ku?

Ku is the active unit of the enzyme, u and u are the same, and 1ku is equivalent to 0.3 IU. It cannot be changed to mg, because the unit and quality of the enzyme are not strictly proportional. Therefore, it needs to be tested. The enzyme activity produced by different manufacturers is different, which is determined according to the catalytic activity.

In legal measurement, U has two different meanings. A "U" is the legal unit of measurement in China and can be used together with SI units. Its relationship with SI unit is1u ≈1.660 540×10-27 kg. Its quantity is called quality; The unit name is "Atomic Mass Unit".

So its quantity sign should be m, for example, the mass of a substance X is 5ku, which can be written as m(X)=5ku. The other u is the unit sign of the atomic mass constant ("μ") of the SI quantity. The unit constant of atomic mass (quantity sign is μ) is defined as "112c of the rest mass of neutral atoms in the ground state"; The name of u is also "atomic mass unit".

Extended data

Relevant regulations on enzyme activity units

1. With regard to the determination of enzyme activity unit, 196 1 International Enzymology Conference stipulates that 1 enzyme activity unit means that it can transform 1μmol substrate or transform substrate under specific conditions (25℃, others are the most suitable conditions) 1min.

2. There are two units of enzyme activity. The enzyme amount of kat and U, 1min can be transformed into 1μmol substrate is called 1 enzyme unit (U), and the enzyme amount of 1s can be transformed into 1mol substrate is 1 katal (abbreviated as. Their conversion is as follows: 1kat = 6 * 10 7u, 1U= 16.67n kat.

Baidu encyclopedia-enzyme

Baidu encyclopedia-vitality unit