Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2014-08-08

Journal: CARBOHYDRATE POLYMERS

Included Journals: Scopus、EI、SCIE、PubMed

Volume: 108

Issue: 1

Page Number: 307-312

ISSN: 0144-8617

Key Words: Starch ethers; Thermoresponsivity; Oligo(ethylene glycol)

Abstract: Water soluble, thermoresponsive 3-[2-butoxy(ethoxy)(m)]-2-hydroxypropyl starch ethers (BEmS) (m = 0, 1, or 2) were prepared by reacting degraded waxy maize starch with n-butyl glycidyl ether, 3-(2-n-butoxyethyl) glycidyl ether, and 3-[2-(2-n-butoxyethoxy)ethyl] glycidyl ether, respectively. The lower critical solution temperatures (LCSTs) of BEmS could be tuned to a wide range from 17.5 degrees C to 55.0 degrees C by changing the side chain lengths of oligo(ethylene glycol) groups and their average molar substitution (MS). The LCSTs of BEmS increase with increasing side chain length of oligo(ethylene glycol) groups when BS, BES, and BE2S have similar MS values. By contrast, an increase in BEmS concentration and addition of NaCl to the BEmS solutions could lead to a decrease in the LCSTs of BEmS. In addition, the effects of NaCl and BEmS concentrations on the LCSTs become weaker when the side chain length of oligo(ethylene glycol) groups increase. (C) 2014 Elsevier Ltd. All rights reserved.