Chelex 100 resin 50 100 mesh

TRC105 was provided by TRACON Pharmaceuticals Inc. (San Diego, CA). p-SCN-Bn-NOTA (i.e., 2-S-(4-isothiocyanatobenzyl)-1,4,7-triazacyclononane-1,4,7-triacetic acid) was acquired from Macrocyclics, Inc. (Dallas, TX). NHS-fluorescein, hematoxylin staining solution, and Chelex 100 resin (50–100 mesh), tetraethyl orthosilicate (TEOS), triethanolamine (TEA), (3-Aminopropyl)triethoxysilane (APS), Cetyltrimethylammonium chloride solution (CTAC, 25 wt %), copper(II) chloride (CuCl₂), sodium sulfide nonahydrate (Na₂S·9H₂O) and dodium citrate dehydrate were purchased from Sigma-Aldrich (St. Louis, MO). AlexaFluor488- and Cy3-labeled secondary antibodies were purchased from Jackson Immunoresearch Laboratories, Inc. (West Grove, CA). PD-10 columns were purchased from GE Healthcare (Piscataway, NJ). Absolute ethanol, sodium chloride (NaCl), doxorubicin hydrochloride (DOX) were purchased from Fisher Scientific. SCM-PEG_5k-Mal was obtained from Creative PEGworks. Water and all buffers were of Millipore grade and pretreated with Chelex 100 resin to ensure that the aqueous solution was free of heavy metals. All chemicals were used as received without further purification.

The details of the reagents and cell culture are provided in the Supplemental Materials. S-2-(4-isothiocyanatobenzyl)-1,4,7-triazacyclononane-1,4,7-triacetic acid (p-SCN-Bn-NOTA) was purchased from Macrocyclics, Inc. (Plano, TX, USA). Chelex 100 resin (50–100 mesh) was purchased from Sigma-Aldrich (St. Louis, MI, USA). PD-10 desalting columns were purchased from GE Healthcare (Chicago, IL, USA). Prdx1 was acquired from Sinobiological (Beijing, China). All other reaction buffers and chemicals were purchased from Thermo Fisher Scientific (Fisher store in Stanford, USA).