Resomer rg 752h

PLGA (Resomer RG 503H and Resomer RG 752H) was purchased from Sigma-Aldrich and used as received. ATTO 488–NHS ester and Atto 633 amine were purchased from ATTO-TEC GmbH (Germany) and used as stock solutions (10 mg/ml) in dimethyl sulfoxide (DMSO).
All other chemicals were purchased from Sigma-Aldrich, unless otherwise specified. All chemicals were used as received.

PLGA (Resomer® RG 752 H, lactide: glycolide 75:25, Mw 4000–15000), polyethylenimine (PEI, branched, Mw ~25,000), dichloromethane (DCM), dimethyl sulfoxide (DMSO), methanol, N,N′-dicyclohexylcarbodiimide (DCC), and N-hydroxysuccinimide (NHS) were purchased from Sigma-Aldrich (St. Louis, MS, USA). ICG was purchased from AdooQ (Irvine, CA, USA). Sodium hyaluronate was obtained from Lifecore Biomedical (Chaska, MN, USA). 4-(4,6-Dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholinium chloride n-hydrate (DMT-MM) was purchased from Wako Pure Chemical Industries Ltd. (Tokyo, Japan). For cell culture, Dulbecco's modified Eagle's medium (DMEM, Gibco, Grand Island, NY, USA) and Iscove's modified Dulbecco's medium (IMDM, Gibco) supplemented with 10% (v/v) fetal bovine serum (FBS) and 1% antibiotic-antimycotic solution were used. DMEM, IMDM, FBS, and phosphate-buffered saline (PBS) were purchased from Lonza Walkersville (Basel, Switzerland). The cell counting kit-8 (CCK-8) was purchased from Dojindo Laboratories Co., Ltd. (Kumamoto, Japan). All reagents used were of analytical grade.