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Transmission electron microscopy (TEM) images and X-ray energy dispersive spectroscopy (XEDS) spectrum of chitosan selenium nanoparticles (CS-SeNPs) (56 ± 5 nm) (a), Ethoxilated-SeNPs (53 ± 6 nm) (b) and hydroxyethyl cellulose (HEC)-SeNPs (60 ± 6 nm) (c) at pH = 5, T = 20 ± 1 °C. Black arrows indicate the Se emission peaks consisting of SeLα, SeKα and SeKβ at 1.4, 11.22 and 12.49 keV, respectively.
