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Fig. 7 a SEM images of bulk curcumin.

Fig. 4 PXRD patterns of bulk curcumin and curcumin-DPIs milled with different times.

Fig. 3 DSC curves of bulk curcumin and curcumin-DPIs milled with different times.

Surface morphologies of bulk curcumin and curcumin-DPIs were investigated by SEM (JSM-7500 F, Japan).

Fig. 5 FTIR spectra of bulk curcumin and curcumin-DPIs milled with different times.

Figure 6 showed the dissolution behavior of bulk curcumin and curcumin-DPIs.

Fig. 1 Particle sizes of unmilled bulk curcumin (0 min) and nanocrystals milled with different times.

Fig. 6 Dissolution profiles of curcumin-DPIs and bulk curcumin in different media.

As seen from the PXRD results in Fig. 4, there were some differences of the polymorphic forms between bulk curcumin and curcumin-DPIs.

In Fig. 3, the bulk curcumin exhibited a sharp endotherm peak with melting point at 186.2 °C, while the melting point of curcumin-DPIs was between 183.2 and 183.7 °C.

Curcumin-DPIs showed a higher dissolution of about 98%% at 4 h with 1 % SDS, 87 % with 0.5 % SDS, and 74 % with 0.3 % SDS, while the dissolution from bulk curcumin was about 90 % with 1 % SDS, 81 % with 0.5 % SDS, and 62 % with 0.3 % SDS.