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2 protocols using n 3 dimethylaminopropyl n ethylcarbodiimide hydrochloride edc

1

Thiol-modified Hyaluronic Acid Hydrogels

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Hyaluronic acid (HA) with molecular weight 0.5–0.75 MDa was purchased from Contipro. Cystamine dihydrochloride (Cys, Sigma Aldrich, St. Louis, MO, USA), 3,3’-dithiobis(propanoic dihydrazide) (Hyd, FisherScientific, USA) and dithiothreitol (DTT, Fluorochem, Hadfield, United Kingdom) were employed for HA modification with thiol groups. N-(3-Dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (EDC, Fluorochem, Had- field, United Kingdom) and 1-Hydroxybenzotriazole hydrate (HOBt, Sigma Aldrich, St. Louis, MO, USA) were used as coupling reagents. Spectra/Por membranes (MWCO: 10 kDa) were employed for purification by dialysis. Phosphate-buffered saline (PBS, Sigma Aldrich P4417, St. Louis, MO, USA) was used as solution medium to form the hydrogels. 5,5′-Dithiobis (2-nitrobenzoic acid) (DTNB Ellman’s reagent, Sigma Aldrich, St. Louis, MO, USA), Ethylenediaminetetraacetic acid (EDTA, Sigma Aldrich, St. Louis, MO, USA) and Cysteina-HCl (Thermo fisher Scientific, USA) were used for the determination of thiol groups.
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2

Synthesis and Characterization of Gabazine-Oregon Green

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Drugs R(+)-Etomidate (etomidate) was purchased from Toronto Research Chemicals Inc. (North York, Ontario, Canada) . The salts used in buffers, HEPES, GABA, propofol, DMEM high glucose, fetal bovine serum, and 0.01% poly-L-Lys solution (70-150 kDa) were purchased from Sigma-Aldrich (St. Louis, MO, USA). Pregnenolone sulfate was purchased from Bio-Techne Corp. (Minneapolis, MN, USA) and Sigma-Aldrich. Phenobarbital was obtained from J.T. Baker Chemical Co (Phillipsburg, NJ, USA). Lipofectamine 2000, Opti-MEM, and trypsin-EDTA were obtained from Thermo Fischer Scientific (Waltham, MA, USA). (E)-3-(furan-2-yl)acrylic acid, (E)-3-(2thienyl)acrylic acid, 1-hydroxybenzotriazole hydrate (HOBt), p-toluidine, tetrahydroquinoline, tetrahydroisoquinoline and 1-aminoindoline hydrochloride were obtained from Sigma-Aldrich SRL (Milan, Italy) .
N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (EDC), triethylamine, sodium hydride and iodomethane were purchased from Fluorochem (Glossop, UK).
Gabazine-oregon green (Gzn-OG) was synthesized as described previously (Sakamoto et al., 2019) .
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