Fig. 1. The morphology of PAAM hydrogel after swelling: a) PAAM_1 ; b) PAAM_2; c) PAAM_3; d) PAAM_4; e) PAAM_5; and
f) PAAM_6 at magnification of 350.
Fig. 2. Degree of swelling of polyacrylamide hydrogel.
DSC thermograms of, aloein-loaded PAAM hydrogel, and PAAM hydrogel were measured to
investigate the interaction between aloein and the polyacrylamide matrix. The melting temperature (Tm)
of PAAM is 219 ˚
C, consistent with a previous report [Sairam et al., 2006]. However, the Tm of PAAM in
aloein-loaded PAAM occurs at 241 o
C, suggesting that aloein possibly interacts with the PAAM hydrogel
through hydrogen bonding between the hydroxyl groups of the aloein and the amine groups of the PAAM
hydrogel