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Fig. 2 | AMB Express

Fig. 2

From: A fabricated hydrogel of hyaluronic acid/curcumin shows super-activity to heal the bacterial infected wound

Fig. 2

Hydrogels characterization using NMR, FTIR, SEM and swelling assay. a 1H NMR spectrum of the pure curcumin in DMSO with specific peaks for the methoxy group (I), hydroxyl group (II) and other protons around the phenyl ring (II). b 1H NMR spectrum of the curcumin released from Gel-H.P.Cur with specific peaks of pure curcumin (I, II, III). Traces of hyaluronic acid (1: CH3 of N-acetyl glucosamine and 2, 3: protons around the sugar ring) and PDMS (a: Si-CH3: and g, h: CH2) were detected in the spectrum. The red numbers in the chemical structure represented the chemical groups detected by NMR. c NMR characteristic peaks of pure curcumin and the curcumin released from Gel-H.P.Cur. d FTIR spectra of Gel-H.P, Gel-H.P.Cur, and Curcumin. Characteristic peaks of HA (~ 1400 cm−1 related to carboxylic acid: O–H bend), PDMS-DG (~ 1260 cm−1 related to Si–C) and curcumin (1231 cm−1: phenolic C–O group and 1498 cm−1: aromatic C=O band stretching vibration) were detected. e–h SEM micrographs of the hydrogels: e and f are micrographs for Gel-H.P, and g and h are for Gel-H.P.Cur. Imaging was performed after coating the lyophilized hydrogels with gold. The detail of magnification and scale bars are demonstrated under each image. i Assessment of the swelling rate of the Gel-H.P.Cur in distilled water at 37 °C. Gel-H.P.Cur showed a high level of water absorption

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