Starch hydrogels as targeted colonic drug delivery vehicles

Todor T. Koev, Hannah C. Harris, Sara Kiamehr, Yaroslav Z. Khimyak, Frederick J. Warren

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Abstract

Targeted colonic drug delivery systems are needed for the treatment of endemic colorectal pathologies, such as Crohn's disease, ulcerative colitis, and colorectal cancer. These drug delivery vehicles are difficult to formulate, as they need to remain structurally intact whilst navigating a wide range of physiological conditions across the upper gastrointestinal tract. In this work we show how starch hydrogel bulk structural and molecular level parameters influence their properties as drug delivery platforms. The in vitro protocols mimic in vivo conditions, accounting for physiological concentrations of gastrointestinal hydrolytic enzymes and salts. The structural changes starch gels undergo along the entire length of the human gastrointestinal tract have been quantified, and related to the materials' drug release kinetics for three different drug molecules, and interactions with the large intestinal microbiota. It has been demonstrated how one can modify their choice of starch in order to fine tune its corresponding hydrogel's pharmacokinetic profile.
Original languageEnglish
Article number119413
JournalCarbohydrate Polymers
Volume289
Early online date26 Mar 2022
DOIs
Publication statusE-pub ahead of print - 26 Mar 2022

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