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The XRD diffractograms: (a) curcumin, (b) 2-hydroxypropyl-β-cyclodextrin, (c) inclusion complex of curcumin: 2-hydroxypropyl-β-cyclodextrin, (d) p(NiPMAm/NiPAm) hydrogel containing 2 mol% of crosslinker, and (e) p(NiPMAm/NiPAm) hydrogel with incorporated curcumin: 2-hydroxypropyl-β-cyclodextrin complex.
