Colon cancer is one of the most common internal malignancies, and conventional chemotherapy is not effective in its treatment. Nanoparticles hold tremendous potential as an effective drug delivery system. The physicochemical properties of β-lactoglobulin, the main whey protein of cow's milk, such as its stability at low pH, its resistance to gastric protease, and its ability to bind hydrophobic ligands, give it potential for transporting drugs specifically for colon cancer. In the present research, β-lactoglobulin-pectin nanoparticles were designed to transfer a newly synthesized, anticancer platinum complex (bipyridine ethyl dithiocarbamate Pt(II) nitrate), to the colon. The effects of multiple factors on the size and the colloidal stability of the nanoparticles were studied using dynamic light scattering and scanning electron microscopy techniques. Results showed that the best particle size and highest colloidal stability were obtained in phosphate buffer, pH 4.5, with 0.5 mg/mL β-lactoglobulin and 0.025-0.05wt% pectin. The drug release profile in simulated gastrointestinal conditions demonstrated that β-lactoglobulin with a secondary coating is stable in acidic conditions but is able to release its cargo at pH 7. Hence, these nanoparticles have potential to serve as novel and effective vehicles for oral drug delivery preparations.

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