Poly (glycerol–sebacate) (PGS) is an elastomeric biodegradable
polyester that has been extensively studied in the field of tissueengineering,
for instance, in superelastic heart patch [10], neural
reconstruction applications [11], and endothelialized microvasculature
[12]. PGS is polycondensed with glycerol and sebacic acid
[13]. Both glycerol and sebacic acid are endogenous components,
thus, the degradation products of PGS are often naturally metabolized
in the body. Biocompatibility analysis in vivo indicates that
PGS has a favorable tissue response with significantly less inflammation
in comparison with poly(lactide-co-glycolide) (PLGA),
a widely utilized biomaterial [11]. Furthermore, our previous
studies found that the microstructure, the degree of crosslinking,
and the degradation rate of PGS can be modulated by doping glycolic
acid [14] or lactic acid [15]. These characterizations indicate
that PGS is an excellent candidate of biodegradable drug carrier.
5-FU is one of the most commonly used anticancer agents, but it is
poorly absorbed after oral administration and shows high variable
pharmacokinetics [16–18], thus, the local drug delivery is the ideal
way to overcome these disadvantages. In the present study, we
prepared PGS implants doped with 5-fluorouracil (5-FU-PGSs), and
characterized the infrared spectrum properties, in vitro degradation
and drug release, in vivo degradation and tissue biocompatibility, in