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UV-VIS spectra of thin PVA cryogels: (1) activated by 1% GA and stained with 50 μM DNPH; (2) average spectrum of three non-activated gels; (3) non-activated gel, reduced by NaBH4; (4) difference spectrum: (1)–(2); (5) 50 μM DNPH; (6) 50 μM DNPH +1.25 mM GA. Solvent: 90% ethanol, containing 40 mM H2SO4.
