β-casein (β-CN), a major milk protein, is amphiphilic and self-associates into micelles in aqueous solutions. We have recently introduced a novel oral dru
g delivery system based on β-CN nanoparticles. The current research builds on and complements this work by studyin
g the interactions of mitoxantrone (MX) and β-CN as they co-assemble into nanoparticles, usin
g absorption and emission spectra, static and dynamic li
ght scatterin
g, and fluorescent emission of both MX and tryptophan 143 (Trp143) of β-CN. The optimal loadin
g molar ratio was 3.3 MX/β-CN at 1 m
g/mL β-CN, and the association constant was (2.45 ± 1.76) × 10
5 M
–1 based on β-CN Trp143 fluorescence; independent MX fluorescence results provided supportin
g values. In these conditions a bimodal particle distribution was obtained (174.4 nm, 45.9 % ; 485.1 nm, 54.1 % ). The
gastric di
gestibility of β-CN su
ggests possible tar
getin
g to stomach tumors. Hence, β-CN nanoparticles have potential to serve as effective vehicles of hydrophobic dru
gs for oral delivery preparations.
From the Clinical Editor
Beta-casein (b-CN) is an amphiphilic milk protein that self-associates into micelles in aqueous solutions and can be utilized as a novel oral drug delivery system. This study investigates the basic properties of a mitoxantrone delivery system based on the above principles.