Abstract
Precise morphologies of pH responsive bioactive lead sulfide nanoparticles (PbS NPs) were synthesized by using industrially and environmentally important proteins like zein and lysozyme (Lys), and a bioactive polymer diethylaminoethyl dextran chloride (DEAE). Though, proteins are not known morphology control agents, zein demonstrated a fine crystal growth control of PbS NPs better than Lys as well as DEAE, and even better than conventional surfactants known for their shape control behavior. Proteins and DEAE coated NPs thus obtained were highly pH responsive in terms of a color change from light gray (at low pH) to dark brown (at high pH). Bioapplicability of coated NPs was done by subjecting them to hemolysis. Both Lys and DEAE coated NPs did not induce any significant hemolysis and demonstrated their good compatibility and usability in systemic circulation. For their industrial scale uses, different extraction methods were proposed by using other industrially important biomolecules and ionic liquids. Alginic acid and xanthan gum were excellent complexing agents for an instant extraction of Lys and DEAE coated NPs from aqueous phase. Ionic liquid exhibited excellent extraction ability in both organic as well as aqueous phases.
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