PPIB and cancer: These studies showed that, under normoxia and hypoxia conditions, hybrid material 3 shows only marginally increased toxicity for cancer cells with respect to the pristine polysaccharide fibers of β‐d‐glucan, highlighting the fact that the use of such adjuvants can mediate the high cellular toxicity of toxic materials such as CdSe@SWNTs and also allows the complete characterization of the encapsulated materials in water media.