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Near-infrared light-responsive alginate hydrogels based on diselenide-containing cross-linkage for on demand degradation and drug release.

Carbohydrate polymers (2019-08-21)
Daru Seto Bagus Anugrah, Kaylan Ramesh, Mingeun Kim, Kyu Hyun, Kwon Taek Lim
ABSTRACT

A biodegradable, near-infrared (NIR) - responsive hydrogel is one of the most promising strategies as a remotely triggered drug carrier. In this study, novel NIR-responsive hydrogels based on alginate structures were prepared for controllable drug release. The hydrogels were formed rapidly by reacting norbornene-functionalized alginates and tetrazine cross-linkers containing diselenide bonds via inverse electron demand Diels-Alder click chemistry. In order to manipulate their properties, we prepared hydrogels with various cross-linking densities. NIR sensitive indocyanine green (ICG) and a drug, doxorubicin (DOX) were incorporated in the hydrogel matrix during gelation. The hydrogels showed a suppressed release profile under physiological conditions, while NIR light triggered a rapid release of DOX. Under NIR-light irradiation, ICG generated reactive oxygen species which could decompose diselenide bonds in the hydrogel matrix, inducing the gel-sol transition and release of entrapped DOX. The degradation of hydrogels could be also controlled by the ratio of the precursors.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
MES, low moisture content, ≥99% (titration)
Sigma-Aldrich
Hydrazine, anhydrous, 98%
Sigma-Aldrich
Formamidine acetate salt, 99%
Sigma-Aldrich
3-Bromopropionic acid, 97%
Sigma-Aldrich
4-(Aminomethyl)benzonitrile hydrochloride, 97%