One FYT is the amount of enzyme that releases 1 μmol of inorganic phosphate from phytase per minute under reaction conditions with a phytate concentration of 5,0 mM at pH 5,5 and a temperature of 37 °C during 30 minutes of incubation.
Üks FYT on ensüümikogus, mis vabastab fütaasist 1 μmol anorgaanilist fosfaati minutis reageerimistingimustes, mille puhul fütaadi kontsentratsioon on 5,0 mM ning pH väärtus on 5,5 ja temperatuur 37 °C 30-minutise inkubatsiooni jooksul.