Table 2.

Comparison of % activity retained after repeated analysis of catechol for the different immobilizations

Immobilization method	% Activity retained after no. of analyses for 50 µM catechol						No. of analyses possible with 50 % activity retention (half-life)
	100	200	300	400	500	550
Co-cross-linking with bovine serum albumin	100	214	121	100	57	50	550
Entrapment	120	69	–	–	–	–	250
Cross-linking	110	50	–	–	–	–	200
Hybrid	113	165	80	65	–	–	450