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Effect of zein nanoparticles (ZNP) at different concentration of on the visual appearance of HPMC films: (a) net HPMC film, (b) HPMC + 0.018 ZNP, (c) HPMC + 0.036 ZNP, (d) HPMC + 0.155 ZNP, and HPMC + 0.268 ZNP (e) (Source: Gilbert et al., 2018)
