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In order to expand our drug delivery technique by glycosylation of chemical into brain delivery, it was demonstrated that oligosaccharide and monosaccharide modifications of curcumin enhanced its crossing ability of the blood-brain barrier (BBB) in mice. The brain sample prepared by glycosidase-catalyzed hydrolysis of brain tissue homogenates of mice, to which curcumin gluco-oligosaccharides were intraperitoneally injected, contained curcumin at 116 ng/1 g of tissue of brain, indicating that curcumin modified with gluco-oligosaccharides residues can smoothly cross the BBB in mouse brain. The brain samples of mice, which were treated with curcumin monosaccharide or curcumin itself, contained curcumin at 18 ng and 0 ng per 1 g of tissue of brain, respectively. On the other hand, after the administration of curcumin gluco-oligosaccharides to C57BL mouse with a large tumor for 5 days, the tumor disappeared.

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Curcumin Oligosaccharides (Gluco-oligosaccharides) Penetrate the Blood-Brain Barrier in Mouse Brain: Glycoside (Polysaccharide) Modification Approach for Brain Drug Delivery Across the Blood-Brain Barrier and Tumor Drug Delivery