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Thursday, May 14, 2020 | History

2 edition of On the interactions and interfacial behaviour of biopolymers found in the catalog.

On the interactions and interfacial behaviour of biopolymers

Arja Paananen

On the interactions and interfacial behaviour of biopolymers

an AFM study

by Arja Paananen

  • 394 Want to read
  • 7 Currently reading

Published by VTT Technical Research Centre of Finland in [Espoo, Finland] .
Written in English

    Subjects:
  • Biopolymers.,
  • Biopolymers -- Surfaces.

  • About the Edition

    Surface forces and interactions are a key issue in colloid and surface science, including biopolymer systems. Covalent and ionic bonds determine the structure and composition of materials, but the weaker non-covalent interactions define their functions. This thesis deals with the surface forces and interactions occurring between biopolymer surfaces and affecting the self-assembly and interfacial behaviour of biopolymers. The research was aimed at deepening the understanding of molecular interactions and the nature and strength of surface forces in the studied biopolymer systems. The main research tool was atomic force microscopy (AFM). This technique allows imaging of the sample topography in either gas or liquid environments at high resolution. Data on intraand intermolecular interactions can also be obtained. Interesting phenomena revealed by AFM were supported and confirmed by other relevant surface analytical techniques. The nanomechanical force measurements focused on interactions relevant in papermaking, i.e. between cellulose and xylan, and food technology, i.e. between gliadins (wheat gluten proteins). In the cellulose-xylan interaction work the colloidal probe technique was exploited by attaching cellulose beads to the tip and to the sample surface. The interaction between these beads was measured in different xylan solutions. The main result of the cellulosic systems provided a new perspective on the role of xylan in papermaking. It has been reported previously that the adsorption of xylan increases paper strength and that this is due to formation of hydrogen bonds. Our results indicate that the increase in paper strength cannot originate from such bonds in wet paper, but must be due to effects of xylan on fibre bonds during drying of paper. The viscous and elastic properties of gliadins and glutenins facilitate the production of bread, pasta and many other food products from wheat flour. Gliadin proteins (alpha- and omega-gliadins) were attached to both the tip and the sample surfaces, and the interaction forces between monomeric gliadins (alpha-alpha, omega-omega, and alpha-omega) were measured. On the basis of the nanomechanical force measurements, different roles of different types of gliadins were proposed: whereas omega-gliadins still have a compact structure and are responsible for the viscous flow, alpha-gliadins have already started to participate in forming the network in dough. This may provide a new viewpoint in understanding the interfacial properties of gliadins in relation to baking. The studies of interfacial behaviour of biopolymers focused on hydrophobins, which are very surface active proteins. Hydrophobins are amphiphilic proteins which self-assemble due to the interplay of various surface forces and interactions in solution and at interfaces. Films of Class II hydrophobins, HFBI and HFBII, at the air-water interface were transferred to solid supports and imaged by AFM. The interfacial films of hydrophobins were imaged at nanometer resolution. The results showed that both HFBI and HFBII form organised structures at the air-water interface. Moreover, the nanostructured films formed spontaneously. The HFBI films were imaged and the organised pattern was seen both on the hydrophobic and the hydrophilic side. The dimensions were similar to those of hydrophobin tetramers in solution obtained by small angle X-ray scattering. Protein engineering enabled assignment of a specific functionality to HFBI. The results confirmed the expected orientation of hydrophobins at the air-water interface, and indicated that the hydrophobin retained its capability to form organised films and the covalently attached molecule its functionality.

    Edition Notes

    StatementArja Paananen.
    SeriesVTT publications -- 637., VTT julkaisuja -- 637.
    ContributionsValtion teknillinen tutkimuskeskus.
    The Physical Object
    Pagination1 v. (various pagings) :
    ID Numbers
    Open LibraryOL16153454M
    ISBN 10951387012X
    ISBN 109789513870126

    Download Material Tissue Interfacial Phenomena ebook PDF and Mobi Format. Click Download or Read Online button to Material Tissue Interfacial Phenomena book pdf for free now. Material Tissue Interfacial Phenomena It contains coverage ranging from fundamentals of bioproduct and solid surface structure to the interactions of. This is a tricky subject partly because at the level of entangled polymer gels, fundamental polymer-polymer interactions do not come up in relevant literature. Past research has instead focused on the collective behavior of these polymer melts, i.e. orientational phase transitions, viscosity and .

    Biopolymers are polymers that are produced by living organisms. They are generally polymers of starch. These are composed of monomeric units. They can be classified based on the three main classes based on the formation of structure, length of the polymers that comprehends more than thirteen nuclei monomers or amino acids which are short lengthened amino acids. The science and technology of hydrocolloids used in food and related systems has seen many new developments and advances over recent years. Gums and Stabilisers for the Food Industry 13 presents the latest research from leading experts in the field including: * Biochemical characterisation, the use of antibodies, immunostaining and enzyme hydrolysis * Chemical and physicochemical.

    A. Interactions Between Protein-Coated Surfaces The scf calculations show that reducing pH toward the protein isoelectric point reduces the strength and range of the interlayer repulsion. This implies a substantial electrostatic contribution to the calculated interaction energy, but the energy remains positive at all : Martin Malmsten. The interactions between proteins and surfactants at solid surfaces are of notable importance in our daily life. The first thing that comes to mind is probably the use of detergents in removal of protein-rich soil, both in industry and at home. Surfactants are used for cleaning dishes, clothes, process equipment, teeth, contact lenses, etc.


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On the interactions and interfacial behaviour of biopolymers by Arja Paananen Download PDF EPUB FB2

Biopolymers Online with Editor in Chief Alexander Steinbüchel provides a comprehensive overview of the occurrence, metabolism, and applications of all important biopolymer classes. This reference work treats processes for biotechnological production, isolation from organisms and modification, material properties and technical uses in areas such as chemical and food industries.

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Recognizing emerging developments in biopolymer systems research with fully updated and expanded chapters, the second edition discusses the biopolymer-based multilayer structures and t.

Presents the first molecular models for interactions between xanthan and galactomannans. The models are based on X-ray diffraction patterns obained from oriented fibres prepared from xanthan-guar are Interactions of food biopolymers Morris and Wilde the first atomic resolution models for intermolecular by: This book comprehensively reviews and compiles information on biopolymers in 30 chapters which cover occurrence, synthesis, isolation and production, properties and applications, modifi cation Author: Magdy Elnashar.

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The fabrication of nanoscale. These areas have not been covered in a single book before and they include biopolymers for chemical and biotechnological modifications, material structures, characterization, processing, properties, and applications. After the introduction which summarizes the importance of biopolymer in the market, the book covers almost all the topics related.

This book brings together a number of key biopolymer and biodegradable plastics topics in one place for a broad audience of engineers and scientists, especially those designing with biopolymers and biodegradable plastics, or evaluating the options for switching from traditional plastics to biopolymers.

Book Description. This new edition features research from nearly 60 of the profession's most distinguished international authorities. Recognizing emerging developments in biopolymer systems research with fully updated and expanded chapters, the second edition discusses the biopolymer-based multilayer structures and their application in biosensors, the progress made in the understanding of.

Biopolymers in Food Colloids: Thermodynamics and Molecular Interactions - CRC Press Book The theme and contents of this book have assumed a new significance in the light of recent ideas on nanoscience and nanotechnology, which are now beginning to influence developments in food research and food processing.

Food Colloids: Interactions, Microstructure and Processing describes the principles and practice underlying the formulation of food emulsions, dispersions, gels, and foams. Emphasis is on understanding how the functional properties of biopolymers and surfactants determine the texture and shelf-life of multiphase food materials.

This book provides essential new findings by experts in the. Egg yolk, due to its emulsifying properties has a long – term tradition in food technology applications.

Additionally, egg yolk extracts obtained through simple procedures were proved to be an attractive alternative to highly purified phospholipids. The aim of this work was to analyse the interfacial behaviour of previously described extracts in relation to liposomes by: 1. Interfacial tension and dilatational rheology were linked to adsorption/desorption kinetics measured under static in vitro conditions.

The interfacial tension and rheology of the multilayers was rather similar to those found for single whey protein layers, as well as their resistance to duodenal conditions and lipolytic components, which is. Get this from a library.

Biopolymers at interfaces. [Martin Malmsten;] -- This revised and expanded second edition builds on the success of its predecessor with fully updated and expanded chapters, gathering material surrounding novel techniques for harnessing and applying. Continue to access RSC content when you are not at your institution.

Follow our step-by-step guide. Biopolymers in Food Colloids: Thermodynamics and Molecular Interactions - Kindle edition by Semenova, Maria Germanovna, Dickinson, Eric. Download it once and read it on your Kindle device, PC, phones or tablets.

Use features like bookmarks, note taking and highlighting while reading Biopolymers in Food Colloids: Thermodynamics and Molecular cturer: CRC Press. COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.

cial interactions play a crucial role in the determination of composite properties, affect-ing structure and micromechanical deformation processes to a great extent, thus investi-gation and modification of these is in the focus of scientific interest.

Biopolymers can also be modified by blending which allows considerable. Purchase Molecular Interfacial Phenomena of Polymers and Biopolymers - 1st Edition.

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Biopolymers in Food Colloids: Thermodynamics and Molecular InteractionsCited by:   The interfacial interaction and effect of biopolymer on crystal structure of hydroxyapatite in biomimetically synthesized nanocomposites, chitosan/hydroxyapatite (ChiHAP50), polygalacturonic acid/hydroxyapatite (PgAHAP50), and chitosan/polygalacturonic acid/hydroxyapatite (ChiPgAHAP50) have been investigated using atomic force microscopy (AFM), Fourier transform infrared (FTIR) Cited by: Maria G.

Semenova, DrSci () in Chemistry, Institute of Biochemical Physics of RAS, is head of the laboratory. She has published extensively on thermodynamic analysis of the impact of biopolymer interactions on structure formation in food colloids (Food Hydrocolloids,21, ) Eric Dickinson, Ph.D.

() in Physical Chemistry, University of Sheffield, is Professor of Food Colloids.