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Fig. 4 | Stem Cell Research & Therapy

Fig. 4

From: A nanocomposite hydrogel delivery system for mesenchymal stromal cell secretome

Fig. 4

Chemical characterization of hydrogel and morphology of nanoparticle-hydrogel composite. a Fourier transform infrared (FTIR) spectra of gelatin (Gel), hyaluronic acid (HA), and gelatin-hyaluronic acid (Gel/HA) hydrogel composite. The characteristic peaks in the Gel/HA hydrogel spectrum centered at 1690, 1564, and 1279 assigned as amide bands I, II, and III. b Scanning electron microscope (SEM) images of the surface of Gel/HA hydrogel composite (G1), ScCM-NP-H composite (G2), and SfCM-NP-H composite (G3). Scale: G1, G2, G3 (left), 500 μm; G1, G2, G3 (right), 10 μm (× 1000 magnification); and G2, G3 (lower right corner), 10 μm (× 2000 magnification). Abbreviations: ScCM-NP-H, serum-containing conditioned medium encapsulated in nanoparticles—embedded in hydrogel composite; SfCM-NP-H, serum-free conditioned medium encapsulated in nanoparticles—embedded in hydrogel composite

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