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Amplification of Hofmeister effect on poly(n-isopropylacrylamide) by crown ether.

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Title: Amplification of Hofmeister effect on poly(n-isopropylacrylamide) by crown ether.
Authors: Reddy, P. Madhusudhana1, Hsieh, Shih-Rong2, Chang, Chi-Jung1 changcj@fcu.edu.tw, Leong, Yun-Yi1, Chen, Jem-Kun3, Lee, Ming-Ching2
Source: Colloids & Surfaces A: Physicochemical & Engineering Aspects. Sep2017, Vol. 528, p1-9. 9p.
Subjects: Crown ethers, Anions, Ethers, Ions, Permeability
Abstract: Indeed, the relative strength of specific ion effect on macromolecule/biomacromolecules increases with increasing concentration. However, the utilization of high ion concentration may lead to aggregation or precipitation of macromolecule/biomacromolecule. Therefore, in the present study, we provided a potential alternative method to tune the strengths of “salting-in” and “salting-out” effects of Hofmeister series anions on the coil-globule transition of poly( N -isopropylacrylamide) (PNIPAM) by using a crown ether, 18-crown-6 (18-C-6) as a crowding agent. The ionic liquids (ILs) having the same cation, 1-butyl-3-methylimidazolium (Bmim + ) and commonly used anions such as CH 3 COO − , Cl − and I − were selected to explore the strengths of “salting-in” and “salting-out” effects of Hofmeister series anions on a coil-globule transition of PNIPAM in the crowded environment of 18-C-6. Our experimental results (differential scanning calorimetry, hydrodynamic radius, fluoresce intensity, Fourier transform infrared spectroscopy, proton nuclear magnetic resonance spectroscopy) demonstrated that the salting-out effect exerted by a kosmotropic anion, CH 3 COO − , is strengthened, while the salting-in effect exerted by a chaotropic anion, I − , is weakened in the presence of 18-C-6. The results from the present study may certainly provide an alternative method to tune the relative strength of Hofmeister effect without increasing salt concentration. [ABSTRACT FROM AUTHOR]
Copyright of Colloids & Surfaces A: Physicochemical & Engineering Aspects is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 123405032
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  Data: Amplification of Hofmeister effect on poly(n-isopropylacrylamide) by crown ether.
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  Data: <searchLink fieldCode="JN" term="%22Colloids+%26+Surfaces+A%3A+Physicochemical+%26+Engineering+Aspects%22">Colloids & Surfaces A: Physicochemical & Engineering Aspects</searchLink>. Sep2017, Vol. 528, p1-9. 9p.
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  Data: <searchLink fieldCode="DE" term="%22Crown+ethers%22">Crown ethers</searchLink><br /><searchLink fieldCode="DE" term="%22Anions%22">Anions</searchLink><br /><searchLink fieldCode="DE" term="%22Ethers%22">Ethers</searchLink><br /><searchLink fieldCode="DE" term="%22Ions%22">Ions</searchLink><br /><searchLink fieldCode="DE" term="%22Permeability%22">Permeability</searchLink>
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  Data: Indeed, the relative strength of specific ion effect on macromolecule/biomacromolecules increases with increasing concentration. However, the utilization of high ion concentration may lead to aggregation or precipitation of macromolecule/biomacromolecule. Therefore, in the present study, we provided a potential alternative method to tune the strengths of “salting-in” and “salting-out” effects of Hofmeister series anions on the coil-globule transition of poly( N -isopropylacrylamide) (PNIPAM) by using a crown ether, 18-crown-6 (18-C-6) as a crowding agent. The ionic liquids (ILs) having the same cation, 1-butyl-3-methylimidazolium (Bmim + ) and commonly used anions such as CH 3 COO − , Cl − and I − were selected to explore the strengths of “salting-in” and “salting-out” effects of Hofmeister series anions on a coil-globule transition of PNIPAM in the crowded environment of 18-C-6. Our experimental results (differential scanning calorimetry, hydrodynamic radius, fluoresce intensity, Fourier transform infrared spectroscopy, proton nuclear magnetic resonance spectroscopy) demonstrated that the salting-out effect exerted by a kosmotropic anion, CH 3 COO − , is strengthened, while the salting-in effect exerted by a chaotropic anion, I − , is weakened in the presence of 18-C-6. The results from the present study may certainly provide an alternative method to tune the relative strength of Hofmeister effect without increasing salt concentration. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Colloids & Surfaces A: Physicochemical & Engineering Aspects is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/j.colsurfa.2017.05.037
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      – Code: eng
        Text: English
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        Type: general
      – SubjectFull: Anions
        Type: general
      – SubjectFull: Ethers
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      – SubjectFull: Ions
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      – SubjectFull: Permeability
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      – TitleFull: Amplification of Hofmeister effect on poly(n-isopropylacrylamide) by crown ether.
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            NameFull: Reddy, P. Madhusudhana
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            NameFull: Hsieh, Shih-Rong
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            NameFull: Chang, Chi-Jung
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              Text: Sep2017
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              Y: 2017
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              Value: 528
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