L-tyrosine (L-Tyr), L-histidine (L-His), formaldehyde, sodium hydroxide, ethanol absolute, acetone, zinc nitrate hexahydrate, 1,3,5-benzenetricarboxylic acid (H3BTC), 2-methylimidazole (2mim), ammonium hydroxide, rhodamine, sodium chloride, potassium chloride, dibasic sodium phosphate, monobasic potassium phosphate, hexamethylene diisocyanate, glycerol ethoxylate (Mn ≈ 1000 g mol-1), and 3-(4,5-dimethyl-2-thi-azolyl)-2,5-diphenyl-2H-tetrazolium bromide (MTT) were acquired from Sigma Aldrich Co. in their original condition and employed them without further modifications.
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