Table 1: Specific surface area of AMS determined from N2 physisorption isotherms.

Micropore volumea (mm3/g)External surface areaa (m2/g)BET surface area (m2/g)

AMS26015518
BSA loaded24015448
10 min releaseb23013440
6 h releaseb23012441
24 h releaseb22013404

Determined using the -plot method; bafter elimination of the adsorbed BSA by calcination.