Document Detail

Competitive adsorption of proteins and low-molecular-weight surfactants: computer simulation and microscopic imaging.
MedLine Citation:
PMID:  14962406     Owner:  NLM     Status:  MEDLINE    
Proteins and low-molecular-weight (LMW) surfactants are used in the food industry as emulsifying (and foaming) ingredients and as stabilizers. These attributes are related to their ability to adsorb at fluid-fluid (and gas-fluid) interfaces lowering the interfacial (and surface) tension of liquids. Hence, the study of the properties of adsorbed layers of these molecules can be expected to lead to a better understanding of their effect on food products. Direct proof of the validity of mesoscopic models of systems of proteins and LMW surfactants can only be achieved by quantitative theoretical predictions being tested against both macroscopic and mesoscopic experiments. Computer simulation constitutes one of the few available tools to predict mathematically the behaviour of models of realistic complexity. Furthermore, experimental techniques such as atomic force microscopy (AFM) now allow high resolution imaging of these systems, providing the mesoscopic scale measurements to compare with the simulations. In this review, we bring together a number of related findings that have been generated at this mesoscopic level over the past few years. A useful simple model consisting of spherical particles interacting via bonded and unbonded forces is described, and the derived computer simulation results are compared against those from the imaging experiments. Special attention is paid to the adsorption of binary mixtures of proteins, mixtures of LMW surfactants, and also protein+surfactant mixed systems. We believe that further development of these mathematically well-defined physical models is necessary in order to achieve a proper understanding of the key physico-chemical processes involved.
Luis A Pugnaloni; Eric Dickinson; Rammile Ettelaie; Alan R Mackie; Peter J Wilde
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Advances in colloid and interface science     Volume:  107     ISSN:  0001-8686     ISO Abbreviation:  Adv Colloid Interface Sci     Publication Date:  2004 Jan 
Date Detail:
Created Date:  2004-02-13     Completed Date:  2004-05-06     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8706645     Medline TA:  Adv Colloid Interface Sci     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  27-49     Citation Subset:  IM    
Procter Department of Food Science, University of Leeds, Leeds LS2 9JT, UK.
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MeSH Terms
Computer Simulation*
Microscopy, Atomic Force
Microscopy, Fluorescence
Molecular Weight
Proteins / chemistry*
Surface Properties
Surface-Active Agents / chemistry*
Reg. No./Substance:
0/Proteins; 0/Surface-Active Agents

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