Then 2 mL substrate linoleic acid solution and 0.96 mL 0.2
M borate buffer were transferred to quartz cuvettes (Unic Instruments
Inc., Shanghai, China),mixed by inversion, and equilibrated at 25 ◦C. Subsequently, 0.04 mL diluted enzyme extract was added
to the quartz cuvettes and immediately mixed by inversion. After
mixing for 3 min, absorbance was measured immediately at
234 nm by a spectrophotometer (UV-2800, Unic Instruments
Inc.). A blank was prepared with 2 mL substrate solution, 0.96
mL borate buffer, and 0.04 mL inactivated crude enzyme extracts.
One unit of LOX activity was defined as a change in 0.001 units of
absorbance per minute enzyme extract. All samples were measured
in triplicate.