Journal
CARBOHYDRATE POLYMERS
Volume 157, Issue -, Pages 858-865Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2016.10.057
Keywords
Multiple antioxidants delivery; Oral delivery system; Konjac glucomannan microspheres; TEMPO-oxidation; pH-responsive microspheres
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Funding
- National Natural Science Foundation of China [NSFC 31201334, 31471577]
- Ministry of Science and Technology of China [2016YFD0400804]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry [LXJJ201304]
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In this study, pH-responsive microspheres loaded with multiple antioxidants were developed for intestine-specific delivery and exhibited synergistic activity. They consist of chitosan (CS)-coated micro spheres made of TEMPO-oxidized Konjac glucomannan (OKGM) polymers, of which the carboxyl (COO-) groups are cross-linked via ferric ions (Fe3+), allowing the hydrophobic (beta-carotene) and hydrophilic (anthocyanins) antioxidants to be simultaneously incorporated. CLSM images showed successful co-encapsulation of beta-carotene and anthocyanins. The in vitro release kinetics of co-loaded CS-OKGM microspheres in simulated GI fluids indicated that the microspheres retain the dual antioxidants in an acidic gastric environment and release them at intestinal pH. Free radical scavenging experiments demonstrated that multiple antioxidants loaded into OKGM system had synergistic activity with enhanced stability against heat. The multi-functional CS-OKGM microspheres showed great potential for multiple antioxidants and intestine-specific delivery with enhanced stability. (C) 2016 Elsevier Ltd. All rights reserved.
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