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Valenti LE, Martins VL, Herrera E, Torresi RM, Giacomelli CE. Ni(ii)-modified solid substrates as a platform to adsorb His-tag proteins. J Mater Chem B 2013; 1:4921-4931. [DOI: 10.1039/c3tb20769b] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Robertson JWF, Kasianowicz JJ, Banerjee S. Analytical Approaches for Studying Transporters, Channels and Porins. Chem Rev 2012; 112:6227-49. [DOI: 10.1021/cr300317z] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Joseph W. F. Robertson
- Physical Measurement Laboratory,
National Institute of Standards and Technology, Gaithersburg, Maryland
20899, United States
| | - John J. Kasianowicz
- Physical Measurement Laboratory,
National Institute of Standards and Technology, Gaithersburg, Maryland
20899, United States
| | - Soojay Banerjee
- National
Institute of Neurological
Disorders and Stroke, Bethesda, Maryland 20824, United States
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Speight RE, Cooper MA. A Survey of the 2010 Quartz Crystal Microbalance Literature. J Mol Recognit 2012; 25:451-73. [DOI: 10.1002/jmr.2209] [Citation(s) in RCA: 104] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Robert E. Speight
- Institute for Molecular Bioscience; The University of Queensland; St. Lucia; Brisbane; 4072; Australia
| | - Matthew A. Cooper
- Institute for Molecular Bioscience; The University of Queensland; St. Lucia; Brisbane; 4072; Australia
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Engelhardt K, Rumpel A, Walter J, Dombrowski J, Kulozik U, Braunschweig B, Peukert W. Protein adsorption at the electrified air-water interface: implications on foam stability. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:7780-7787. [PMID: 22530646 DOI: 10.1021/la301368v] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The surface chemistry of ions, water molecules, and proteins as well as their ability to form stable networks in foams can influence and control macroscopic properties such as taste and texture of dairy products considerably. Despite the significant relevance of protein adsorption at liquid interfaces, a molecular level understanding on the arrangement of proteins at interfaces and their interactions has been elusive. Therefore, we have addressed the adsorption of the model protein bovine serum albumin (BSA) at the air-water interface with vibrational sum-frequency generation (SFG) and ellipsometry. SFG provides specific information on the composition and average orientation of molecules at interfaces, while complementary information on the thickness of the adsorbed layer can be obtained with ellipsometry. Adsorption of charged BSA proteins at the water surface leads to an electrified interface, pH dependent charging, and electric field-induced polar ordering of interfacial H(2)O and BSA. Varying the bulk pH of protein solutions changes the intensities of the protein related vibrational bands substantially, while dramatic changes in vibrational bands of interfacial H(2)O are simultaneously observed. These observations have allowed us to determine the isoelectric point of BSA directly at the electrolyte-air interface for the first time. BSA covered air-water interfaces with a pH near the isoelectric point form an amorphous network of possibly agglomerated BSA proteins. Finally, we provide a direct correlation of the molecular structure of BSA interfaces with foam stability and new information on the link between microscopic properties of BSA at water surfaces and macroscopic properties such as the stability of protein foams.
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Affiliation(s)
- Kathrin Engelhardt
- Institute of Particle Technology (LFG), University of Erlangen-Nuremberg, Cauerstrasse 4, 91058 Erlangen, Germany
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Holinga GJ, York RL, Onorato RM, Thompson CM, Webb NE, Yoon AP, Somorjai GA. An SFG Study of Interfacial Amino Acids at the Hydrophilic SiO2 and Hydrophobic Deuterated Polystyrene Surfaces. J Am Chem Soc 2011; 133:6243-53. [DOI: 10.1021/ja1101954] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- George J. Holinga
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States, and Materials Science Division, Lawrence Berkeley National Laboratories, Berkeley, California 94720, United States
| | - Roger L. York
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States, and Materials Science Division, Lawrence Berkeley National Laboratories, Berkeley, California 94720, United States
| | - Robert M. Onorato
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States, and Materials Science Division, Lawrence Berkeley National Laboratories, Berkeley, California 94720, United States
| | - Christopher M. Thompson
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States, and Materials Science Division, Lawrence Berkeley National Laboratories, Berkeley, California 94720, United States
| | - Nic E. Webb
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States, and Materials Science Division, Lawrence Berkeley National Laboratories, Berkeley, California 94720, United States
| | - Alfred P. Yoon
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States, and Materials Science Division, Lawrence Berkeley National Laboratories, Berkeley, California 94720, United States
| | - Gabor A. Somorjai
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States, and Materials Science Division, Lawrence Berkeley National Laboratories, Berkeley, California 94720, United States
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