Maximum initial speed

The maximum initial Speed belongs to constant the kinetics of the enzymatic reaction which it characterizes. It is symbolized by Vmax . It reflects the activity (the effectiveness) of an enzyme. It is a measurement of the quantity of product (S) formed (S) per unit of time under the conditions where the reaction return is neglected.

It can be expressed in two types of unit:

  • In UI (international unit) corresponds to the quantity of enzyme catalyzing the transformation of 1 ยต mole of substrate by minute;
  • In Katal (kat), 1 katal corresponds to a mole of substrate treated by second;
It corresponds at the speed of transformation of a substrate by a Enzyme in the presence of a concentration saturating with substrate. Beyond this concentration saturating with substrate, the reaction speed enzymatic reaches a maximum (and remains constant), the enzyme cannot go more quickly this is why it characterizes it: it is the maximum initial Speed. The determination speed is made at the beginning of reaction, whereas the concentrations of the products is still weak. The speed of reformation of the substrates starting from the product is thus neglected. One can also use of artifices to minimize the influence of the reaction of return, such as for example eliminating the product from reaction by transforming it into another or extracting it from the solution. One thus speaks initial speed because the speed of reformation is neglected.

See too

  • Equation of Michaelis Menten.

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