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Thill S, Schmidt T, Wöll D, Gebhardt R. Single particle tracking as a new tool to characterise the rennet coagulation process. Int Dairy J 2020. [DOI: 10.1016/j.idairyj.2020.104659] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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2
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Jing Li, Chi H, Xu J, Li T. Composition Gradient, Structure, and Mechanical Properties of Mono Epoxy Terminated Polydimethylsiloxanes Grafted Gelatin Films. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2018. [DOI: 10.1134/s0036024418090108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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3
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Fan Q, Ma J, Xu Q, Wang J, Ma Y. Facile Synthesis of Chitosan-Coated Silica Nanocapsules via Interfacial Condensation Approach for Sustained Release of Vanillin. Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.8b00217] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
| | | | | | - John Wang
- Department of Materials Science & Engineering, National University of Singapore (NUS), Singapore 117456
| | - Yanxiao Ma
- Department of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487, United States
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4
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Ingham B, Smialowska A, Erlangga GD, Matia-Merino L, Kirby NM, Wang C, Haverkamp RG, Carr AJ. Revisiting the interpretation of casein micelle SAXS data. SOFT MATTER 2016; 12:6937-53. [PMID: 27491477 DOI: 10.1039/c6sm01091a] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
An in-depth, critical review of model-dependent fitting of small-angle X-ray scattering (SAXS) data of bovine skim milk has led us to develop a new mathematical model for interpreting these data. Calcium-edge resonant soft X-ray scattering data provides unequivocal evidence as to the shape and location of the scattering due to colloidal calcium phosphate, which is manifested as a correlation peak centred at q = 0.035 Å(-1). In SAXS data this feature is seldom seen, although most literature studies attribute another feature centred at q = 0.08-0.1 Å(-1) to CCP. This work shows that the major SAXS features are due to protein arrangements: the casein micelle itself; internal regions approximately 20 nm in size, separated by water channels; and protein structures which are inhomogeneous on a 1-3 nm length scale. The assignment of these features is consistent with their behaviour under various conditions, including hydration time after reconstitution, addition of EDTA (a Ca-chelating agent), addition of urea, and reduction of pH.
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Affiliation(s)
- B Ingham
- Callaghan Innovation, P.O. Box 31310, Lower Hutt 5040, New Zealand.
| | - A Smialowska
- School of Food and Nutrition, Massey University, Private Bag 11222, Palmerston North 4442, New Zealand
| | - G D Erlangga
- School of Food and Nutrition, Massey University, Private Bag 11222, Palmerston North 4442, New Zealand
| | - L Matia-Merino
- School of Food and Nutrition, Massey University, Private Bag 11222, Palmerston North 4442, New Zealand
| | - N M Kirby
- Australian Synchrotron, 800 Blackburn Road, Clayton, VIC 3168, Australia
| | - C Wang
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - R G Haverkamp
- School of Engineering and Advanced Technology, Massey University, Private Bag 11222, Palmerston North 4442, New Zealand
| | - A J Carr
- School of Food and Nutrition, Massey University, Private Bag 11222, Palmerston North 4442, New Zealand
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5
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Zhang F, Ma J, Xu Q, Zhou J, Simion D, Carmen G, Wang J, Li Y. Hollow Casein-Based Polymeric Nanospheres for Opaque Coatings. ACS APPLIED MATERIALS & INTERFACES 2016; 8:11739-11748. [PMID: 27090208 DOI: 10.1021/acsami.6b00611] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Casein-based hollow polymeric sphere were fabricated through emulsifier-free polymerization coupled with alkali swelling approach. Hollow structure and nanoscale size of casein-based polymeric spheres were verified by TEM, AFM, SEM, and UV-vis spectra. The as-obtained hollow spheres were proved exhibiting superior opaque characteristic. Through adjusting the structural parameters, for example, MAA usages and MAA content in seed to core, sphere film showed tunable visible-light transmittance and antiultraviolet property. The formation mechanism of casein-based hollow sphere has been discussed in depth. Worth mentioning, the resultant hollow polymeric sphere can easily form films itself at room temperature, which would open a new possibility of designing opaque coatings in several fields, such as leather, packaging, paper making, biomedical, and special indoor coating applications.
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Affiliation(s)
- Fan Zhang
- College of Resource and Environment, Shaanxi University of Science and Technology , Xi'an 710021, Shaanxi Province PR China
| | - Jianzhong Ma
- College of Resource and Environment, Shaanxi University of Science and Technology , Xi'an 710021, Shaanxi Province PR China
- Shaanxi Research Institute of Agricultural Products Processing Technology , Xi'an 710021, Shaanxi Province PR China
| | - Qunna Xu
- College of Resource and Environment, Shaanxi University of Science and Technology , Xi'an 710021, Shaanxi Province PR China
- Shaanxi Research Institute of Agricultural Products Processing Technology , Xi'an 710021, Shaanxi Province PR China
| | - Jianhua Zhou
- College of Resource and Environment, Shaanxi University of Science and Technology , Xi'an 710021, Shaanxi Province PR China
- Shaanxi Research Institute of Agricultural Products Processing Technology , Xi'an 710021, Shaanxi Province PR China
| | - Demetra Simion
- R&D National institute for Textile and Leather-Division Leather and Footwear Research Institute , Bucharest 031215, Romania
| | - Gaidău Carmen
- R&D National institute for Textile and Leather-Division Leather and Footwear Research Institute , Bucharest 031215, Romania
| | - John Wang
- Department of Materials Science and Engineering, National University of Singapore , Singapore 117574, Singapore
| | - Yunqi Li
- Key Laboratory of Synthetic Rubber, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun, 130022, PR China
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6
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Metwalli E, Hermes HE, Calzada E, Kulozik U, Egelhaaf SU, Müller-Buschbaum P. Water ingress into a casein film quantified using time-resolved neutron imaging. Phys Chem Chem Phys 2016; 18:6458-64. [PMID: 26862596 DOI: 10.1039/c5cp07072d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The migration of water into a casein film was probed with neutron radiography. From the neutron transmission images, the evolution of the water saturation profiles was extracted. The results indicate that the water influx is dominated by imbibition but also contains a diffusional component. The time dependence of the water ingress was quantified using a diffusion-like equation previously also applied to imbibition. A water transport coefficient D = 0.9 × 10(-9) m(2) s(-1) was found. This value and direct observation of the images indicate that the time taken for a typical adhesive casein-based layer to become saturated with water is of the order of hours.
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Affiliation(s)
- E Metwalli
- Technische Universität München, Physik-Department, Lehrstuhl für Funktionelle Materialien, James-Franck-Str.1, 85748 Garching, Germany.
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7
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Reinke SK, Roth SV, Santoro G, Vieira J, Heinrich S, Palzer S. Tracking Structural Changes in Lipid-based Multicomponent Food Materials due to Oil Migration by Microfocus Small-Angle X-ray Scattering. ACS APPLIED MATERIALS & INTERFACES 2015; 7:9929-9936. [PMID: 25894460 DOI: 10.1021/acsami.5b02092] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
One of the major problems in the confectionery industry is chocolate fat blooming, that is, the formation of white defects on the chocolate surface due to fat crystals. Nevertheless, the mechanism responsible for the formation of chocolate fat blooming is not fully understood yet. Chocolate blooming is often related to the migration of lipids to the surface followed by subsequent recrystallization. Here, the migration pathway of oil into a cocoa butter matrix with different dispersed particles was investigated by employing microfocus small-angle X-ray scattering and contact angle measurements. Our results showed that the chocolate powders get wet by the oil during the migration process and that the oil is migrating into the pores within seconds. Subsequently, cocoa butter is dissolved by the oil, and thus, its characteristic crystalline structure is lost. The chemical process provoked by the dissolution is also reflected by microscopical changes of the surface morphology of chocolate model samples after several hours from the addition of oil to the sample. Finally, the surface morphology was investigated before and after oil droplet exposure and compared to that of water exposure, whereby water seems to physically migrate through the particles, namely cocoa powder, sucrose, and milk powder, which dissolve in the presence of water.
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Affiliation(s)
- Svenja K Reinke
- †Institute of Solids Process Engineering and Particle Technology, Denickestr. 15, 21075 Hamburg, Germany
| | - Stephan V Roth
- ‡Photon Science, DESY, Notkestr. 85, 22607 Hamburg, Germany
| | | | - Josélio Vieira
- §Nestlé Product Technology Centre York, P.O. Box 204, Haxby Road, York YO91 1XY, England, United Kingdom
| | - Stefan Heinrich
- †Institute of Solids Process Engineering and Particle Technology, Denickestr. 15, 21075 Hamburg, Germany
| | - Stefan Palzer
- ∥Nestlé SA, Avenue Nestlé 55, 1800 Vevey, Switzerland
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8
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Structure of milk protein deposits formed by casein micelles and β-lactoglobulin during frontal microfiltration. J Memb Sci 2014. [DOI: 10.1016/j.memsci.2014.05.027] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Gebhardt R, Steinhauer T, Meyer P, Sterr J, Perlich J, Kulozik U. Structural changes of deposited casein micelles induced by membrane filtration. Faraday Discuss 2012; 158:77-88; discussion 105-24. [DOI: 10.1039/c2fd20022h] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Gebhardt R, Vendrely C, Kulozik U. Structural characterization of casein micelles: shape changes during film formation. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2011; 23:444201. [PMID: 22012684 DOI: 10.1088/0953-8984/23/44/444201] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The objective of this study was to determine the effect of size-fractionation by centrifugation on the film structure of casein micelles. Fractionated casein micelles in solution were asymmetrically distributed with a small distribution width as measured by dynamic light scattering. Films prepared from the size-fractionated samples showed a smooth surface in optical microscopy images and a homogeneous microstructure in atomic force micrographs. The nano- and microstructure of casein films was probed by micro-beam grazing incidence small angle x-ray scattering (μGISAXS). Compared to the solution measurements, the sizes determined in the film were larger and broadly distributed. The measured GISAXS patterns clearly deviate from those simulated for a sphere and suggest a deformation of the casein micelles in the film.
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Affiliation(s)
- R Gebhardt
- Technische Universität München, Chair for Food Process Engineering and Dairy Technology, Weihenstephaner Berg 1, 85354 Freising-Weihenstephan, Germany.
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Gebhardt R, Holzmüller W, Zhong Q, Müller-Buschbaum P, Kulozik U. Structural ordering of casein micelles on silicon nitride micro-sieves during filtration. Colloids Surf B Biointerfaces 2011; 88:240-5. [DOI: 10.1016/j.colsurfb.2011.06.038] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2011] [Revised: 06/27/2011] [Accepted: 06/27/2011] [Indexed: 11/17/2022]
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12
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Bouchoux A, Gésan-Guiziou G, Pérez J, Cabane B. How to squeeze a sponge: casein micelles under osmotic stress, a SAXS study. Biophys J 2011; 99:3754-62. [PMID: 21112300 DOI: 10.1016/j.bpj.2010.10.019] [Citation(s) in RCA: 126] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2010] [Revised: 09/24/2010] [Accepted: 10/08/2010] [Indexed: 11/18/2022] Open
Abstract
By combining the osmotic stress technique with small-angle x-ray scattering measurements, we followed the structural response of the casein micelle to an overall increase in concentration. When the aqueous phase that separates the micelles is extracted, they behave as polydisperse repelling spheres and their internal structure is not affected. When they are compressed, the micelles lose water and shrink to a smaller volume. Our results indicate that this compression is nonaffine, i.e., some parts of the micelle collapse, whereas other parts resist deformation. We suggest that this behavior is consistent with a spongelike casein micelle having a triple hierarchical structure. The lowest level of the structure consists of the CaP nanoclusters that serve as anchors for the casein molecules. The intermediate level consists of 10- to 40-nm hard regions that resist compression and contain the nanoclusters. Those regions are connected and/or partially merged with each other, thus forming a continuous and porous material. The third level of structure is the casein micelle itself, with an average size of 100 nm. In our view, such a structure is consistent with the observation of 10- to 20-nm casein particles in the Golgi vesicles of lactating cells: upon aggregation, those particles would rearrange, fuse, and/or swell to form the spongelike micelle.
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Affiliation(s)
- Antoine Bouchoux
- INRA, UMR1253 Science et Technologie du Lait et de l'Œuf, F-35042 Rennes, France.
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