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28 results on '"Wu, Shuanggen"'

26. Assembly Pattern of Supramolecular Hydrogel Induced by Lower Critical Solution Temperature Behavior of Low-Molecular-Weight Gelator

Author

Wu, Shuanggen, Zhang, Qiao, Deng, Yan, Li, Xing, Luo, Zheng, Zheng, Bo, and Dong, Shengyi

Abstract

Although the gelation process and lower critical solution temperature (LCST) behavior are well acknowledged in polymer systems, low-molecular-weight gelators (LMWGs) rarely display LCST behavior during supramolecular gelation. Herein, we report an LMWG system with LCST-type thermoresponsiveness and an LCST-triggered supramolecular gelation process. Temperature plays a crucial role in this system, not only affecting the LCST phase separation but also triggering the gelation process. The backbones (three-dimensional structures) of the resulting hydrogel are the hierarchical assemblies of the LMWG undergoing the LCST phase separation. Hence, the gelation of the LMWG is only realized when the gelation temperature is above the critical transition temperature (Tcloud) of the LCST behavior, which is different from many supramolecular or polymeric hydrogel systems.

Published
2020
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27. Salting‐out extraction of sinomenine from Sinomenium acutum by an alcohol/salt aqueous two‐phase system using ionic liquids as additives.

Author

Li, Fenfang, Li, Qiao, Wu, Shuanggen, Sun, Danyu, and Tan, Zhijian

Subjects
ALKALOIDS, AQUEOUS solutions, SOLVENT extraction, IONIC liquids, ADDITIVES
Abstract

Abstract: BACKGROUND: The aqueous two‐phase extraction (ATPE) based on organic solvent and inorganic salt was considered a promising method in the extraction, enrichment, and purification field. Ionic liquids (ILs) used as additives to the aqueous two‐phase system (ATPS) can improve the extraction yield. RESULTS: In this study, seven ILs were added to the ethanol/ammonium sulfate ATPS and used for the salting‐out extraction (SOE) of sinomenine from Sinomenium acutum. The IL [C2OHmim]FeCl4 was screened as the optimal additive, then the influencing factors IL amount, ethanol concentration, salt concentration, and temperature were investigated. The maximum extraction efficiency of 96.4% was obtained under the following conditions: 23.06 wt% ethanol concentration, 27.28 wt% (NH4)2SO4 concentration, 4.0 wt% [C2OHmim]FeCl4 and 40°C temperature. Moreover, the components in the SOE system can be recycled after extraction. CONCLUSION: Thus, this ATPS had lower cost and higher extraction ability, and it is feasible to scale up using a small amount of ILs. This system can also be used in the extraction of some other important active compounds from natural plant resources. © 2017 Society of Chemical Industry [ABSTRACT FROM AUTHOR]

Published
2018
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