Add time:08/18/2019         Source:sciencedirect.com

In this study, we explored the effect of nanosilver, chitosan characteristics, and solution conditions on gelation temperatures of chitosan/2-glycerophosphate thermosensitive hydrogel. The gelation temperatures of hydrogels with or without 12 ppm nanosilver were insignificantly different regardless of the molecular weight (MW) of chitosan (degree of deacetylation, DD, 80% or 88%) and glycerophosphate concentration. The gelation temperature of hydrogel decreased with increasing DD (65–88%) of chitosan, increasing concentration of glycerophosphate (2–8%), and increasing pH value (6.5–6.8). It also decreased with decreasing chitosan's MW (DD88: 113–345 kDa, DD80: 145–900 kDa), but increased with increasing concentrations of NaCl (0–2%). By adjusting above conditions, the hydrogel gelation can be induced with a temperature range from 24.3 to 91.7 °C. Chitosan chains with higher flexibility and/or smaller hydrodynamic volume resulted in lower gelation temperature. Hydrogel became white turbidity in 2% NaCl below 38 °C because of its lower solubility at higher ionic strength.

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