The interaction of poly(ethylene glycol) with bovine serum albumin studied with low-field nuclear magnetic resonance

In this study, poplar and Masson pine trees were used as raw materials to examine the structural characteristics of lignin that had been isolated with a phase separation system. Following phase separation, the structure of lignocresol (LC) was characterized with Fourier transform infrared (FTIR) spectroscopy, high-performance gel permeation chromatography (GPC), proton nuclear magnetic resonance (1H-NMR) spectroscopy, and two-dimensional heteronuclear single quantum coherence nuclear magnetic resonance (2D HSQC NMR) spectroscopy. Phase separation made it possible to analyze the proportions and the differences between various structural units in the isolated lignin, as well as the types of linkages between them. In-situ and real-time monitoring of the adsorption and desorption properties of the LC membranes were conducted with a bovine serum albumin (BSA) assay and a quartz crystal microbalance (QCM-D). Our findings revealed that the LC membrane of Masson pine adsorbed more BSA than that of poplar, indicating Masson pine LC molecules were more hydrophobic due to a higher proportion of guaiacyl (G)-type lignin units.

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Interaction of Bovine Serum Albumin (BSA) with Novel Gemini Surfactants Studied by Synchrotron Radiation Scattering (SR-SAXS), Circular Dichroism (CD), and Nuclear Magnetic Resonance (NMR)

The Journal of Physical Chemistry B ◽

10.1021/jp5047485 ◽

2014 ◽

Vol 118 (29) ◽

pp. 8652-8661 ◽

Cited By ~ 29

Author(s):

W. Gospodarczyk ◽

K. Szutkowski ◽

M. Kozak

Keyword(s):

Nuclear Magnetic Resonance ◽

Magnetic Resonance ◽

Synchrotron Radiation ◽

Bovine Serum Albumin ◽

Serum Albumin ◽

Bovine Serum ◽

Gemini Surfactants ◽

Radiation Scattering ◽

Circular Dichroïsm ◽

Nuclear Magnetic

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13C/7Li Solid-State Nuclear Magnetic Resonance Study on Poly(Ethylene Glycol)-Poly(Propylene Glycol)-Poly(Ethylene Glycol)/LiCF3SO3 Copolymer Electrolytes

Materials Science Forum ◽

10.4028/www.scientific.net/msf.982.26 ◽

2020 ◽

Vol 982 ◽

pp. 26-33

Author(s):

Ling Wei ◽

Da Wei Li

Keyword(s):

Nuclear Magnetic Resonance ◽

Solid State ◽

Magnetic Resonance ◽

High Resolution ◽

Ethylene Glycol ◽

Phase Structure ◽

Poly Ethylene Glycol ◽

Chain Dynamics ◽

Poly Ethylene ◽

Nuclear Magnetic

Solid-state high-resolution 13C/7Li nuclear magnetic resonance (NMR) study was performed on the phase structure and chain dynamics of PEG-PPG-PEGn/LiCF3SO3 (n=3, 6, 12) copolymer electrolytes. PEG repeating units and Li+ form PEG3:LiCF3SO3 crystalline complex and PE3/Li+ amorphous complex in all the samples. PPG repeating units and Li+ form different complexes with respect to O:Li+ feed ratio (denoted as PP/Li+-3/6/12). The 13C chemical shifts and half widths of the signals from PP/Li+-3/6/12 remain unchanged, which implies the structures of PP/Li+-3/6/12 are similar at least in a very short range. The half width of the 7Li signals from PP/Li+-3/6/12 becomes narrower and narrower as the Li+ concentration decreases. This indicates the chain mobility of the amorphous phase increases with the decrease of ionic concentration. Moreover, neat crystalline PEG, neat amorphous PEG and neat amorphous PPG start to appear when O:Li+ is greater than 3:1 and their contents increase with the increase of O:Li+. Overall, solid-state high-resolution NMR is a powerful and unique method for understanding the phase structure and chain dynamics of solid polymer electrolytes (SPEs), more applications of this technique to studies on SPEs is expecting.

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