Undecylenic acid

Medical-grade PLLA (Mη = 1 × 10⁵ g/mol) was supplied by Daigang Biomaterial Co. (Jinan, China). Cholesterol (purity ≥ 99.0%) was purchased from Aiwang Chemical Technology Co. (Shanghai, China). Undecylenic acid, chloroplatinic acid (H₂PtCl₆▪6H₂O), and polymethylhydrogensiloxane (PMHS, Mn = 697) were purchased from Shanghai Macklin Biochemical Co. (Shanghai, China). Dicyclohexylcarbodiimide (DCC), 4-dimethylaminopyridine (DMAP), N,N-dimethylformamide, toluene, dichloromethane (DCM), hydrochloric acid (HCl), sodium hydroxide (NaOH), sodium bicarbonate (NaHCO₃), anhydrous magnesium sulfate (MgSO₄), methanol, and ethanol were supplied by Sinopharm Chemical Reagent Co. (Shenyang, China). SBF (1.5 × SBF) was obtained from Xinhua Luyuan Technology Co., Ltd. (Beijing, China).

Cholesterol (degree of deacetylation ≈ 95%) was sourced from Aladdin Biochemical Technology Co., Ltd. (Shanghai, China). Undecylenic acid, chloroplatinic acid (H₂PtCl₆·6H₂O), and polymethylhydrogensiloxane (PMHS) were obtained from Shanghai Macklin Biochemical Co. (Shanghai, China). Cetyltrimethylammonium bromide (CTAB), tetraethoxysilane (TEOS), azobisisobutyronitrile (AIBN), methyl acetoacetate (MAA), ethylene dimethacrylate (EDMA), and all other analytical reagents used in the experiments were procured from Tianjin Damao Chemical Reagent Factory.