Table 4. Effect of TPP on the activity of various AOs.

Experiments were carried out in 25 mM Hepes/150 mM NaCl/1 mM TPP at pH 7.20 and 25 °C. For human AOs, the activity measurements were carried out at 37 °C as described by Holt et al. [49]. All measurements were carried out at [S]≪K_m for various enzyme/substrate systems.

Source of AO	Substrate	Residual activity (kcat/Km) (%)
Bovine serum*	SPM	0
Pig kidney	Cadaverine	55
Soybean seedling	Cadaverine	100
Human platelets*	BZA, NONA	100
Human serum*	Cadaverine	33

* Bovine serum, human serum and platelets were used without further purification.