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Zhang J, Jiao Y, Zhang Y, Wang K, Sui X, Song D, Drioli E, Cheng X. Development of Hydrophilic Polylactic Acid Hollow-Fiber Membranes for Water Remediation. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c03100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Jinghao Zhang
- State Key Laboratory of Urban Water Resource and Environment, School of Marine Science and Technology, Harbin Institute of Technology, Weihai264209, P.R. China
| | - Yang Jiao
- State Key Laboratory of Urban Water Resource and Environment, School of Marine Science and Technology, Harbin Institute of Technology, Weihai264209, P.R. China
| | - Yingjie Zhang
- State Key Laboratory of Urban Water Resource and Environment, School of Marine Science and Technology, Harbin Institute of Technology, Weihai264209, P.R. China
- Shandong Sino-European Membrane Technology Research Institute Co., Ltd., Weihai Key Laboratory of Water Treatment and Membrane Technology, Weihai264209, P.R. China
| | - Kai Wang
- State Key Laboratory of Urban Water Resource and Environment, School of Marine Science and Technology, Harbin Institute of Technology, Weihai264209, P.R. China
- Shandong Sino-European Membrane Technology Research Institute Co., Ltd., Weihai Key Laboratory of Water Treatment and Membrane Technology, Weihai264209, P.R. China
| | - Xiao Sui
- State Key Laboratory of Urban Water Resource and Environment, School of Marine Science and Technology, Harbin Institute of Technology, Weihai264209, P.R. China
- Shandong Sino-European Membrane Technology Research Institute Co., Ltd., Weihai Key Laboratory of Water Treatment and Membrane Technology, Weihai264209, P.R. China
| | - Dan Song
- State Key Laboratory of Urban Water Resource and Environment, School of Marine Science and Technology, Harbin Institute of Technology, Weihai264209, P.R. China
- Shandong Sino-European Membrane Technology Research Institute Co., Ltd., Weihai Key Laboratory of Water Treatment and Membrane Technology, Weihai264209, P.R. China
| | - Enrico Drioli
- Institute on Membrane Technology (ITM-CNR), Via P. Bucci 17c, 87036Rende, Cosenza, Italy
| | - Xiquan Cheng
- State Key Laboratory of Urban Water Resource and Environment, School of Marine Science and Technology, Harbin Institute of Technology, Weihai264209, P.R. China
- Shandong Sino-European Membrane Technology Research Institute Co., Ltd., Weihai Key Laboratory of Water Treatment and Membrane Technology, Weihai264209, P.R. China
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Thimmappa R, Fawaz M, Devendrachari MC, Gautam M, Kottaichamy AR, Shafi SP, Thotiyl MO. Anisotropic amplification of proton transport in proton exchange membrane fuel cells. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2017.04.080] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Phillips LR, Cole CD, Hendershot RJ, Cotten M, Cross TA, Busath DD. Noncontact dipole effects on channel permeation. III. Anomalous proton conductance effects in gramicidin. Biophys J 2008; 77:2492-501. [PMID: 20540928 DOI: 10.1016/s0006-3495(99)77085-2] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/1998] [Accepted: 08/04/1999] [Indexed: 11/25/2022] Open
Abstract
Proton transport on water wires, of interest for many problems in membrane biology, is analyzed in side-chain analogs of gramicidin A channels. In symmetrical 0.1N HCl solutions, fluorination of channel Trp(11), Trp-(13), or Trp(15) side chains is found to inhibit proton transport, and replacement of one or more Trps with Phe enhances proton transport, the opposite of the effects on K(+) transport in lecithin bilayers. The current-voltage relations are superlinear, indicating that some membrane field-dependent process is rate limiting. The interfacial dipole effects are usually assumed to affect the rate of cation translocation across the channel. For proton conductance, however, water reorientation after proton translocation is anticipated to be rate limiting. We propose that the findings reported here are most readily interpreted as the result of dipole-dipole interactions between channel waters and polar side chains or lipid headgroups. In particular, if reorientation of the water column begins with the water nearest the channel exit, this hypothesis explains the negative impact of fluorination and the positive impact of headgroup dipole on proton conductance.
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Affiliation(s)
- L R Phillips
- Zoology Department, Brigham Young University, Provo, Utah 84062, USA
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