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Inhibiting Ice Recrystallization by Nanocelluloses

Published on Apr 8, 2019in Biomacromolecules 5.74
· DOI :10.1021/acs.biomac.9b00027
Teng Li (University of Tennessee), Ying Zhao (University of Tennessee)+ 1 AuthorsTao Wu (University of Tennessee)
Abstract
Biocompatible materials with ice recrystallization inhibition (IRI) activity have potential applications in several fields. Emerging studies have associated the IRI activity of antifreeze proteins/glycoproteins and several mimics of synthetic materials with a facially amphipathic structure. Nanocelluloses are a new family of renewable materials that demonstrate amphiphilicity. Herein the IRI activity of cellulose nanocrystals (CNCs) and 2, 2, 6, 6-tetramethylpiperidine-1-oxyl oxidized cellulose nanofibrils (TEMPO-CNFs) is reported. In 0.01 M NaCl, ice recrystallization was effectively inhibited by 5.0 mg/mL CNCs or 2.0 mg/mL TEMPO-CNFs. In phosphate-buffered saline, appreciable IRI activity was still observed with 30.0 mg/mL CNCs. IRI assays in sucrose solutions showed that the decreased IRI activity of nanocelluloses in saline was caused by the aggregation of nanocelluloses due to charge screening. Neither thermal hysteresis nor dynamic ice shaping activity was observed in nanocelluloses. These findings ...
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