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Fan Y, Gan C, Li Y, Kang L, Yi J. Fabrication of bovine serum albumin nanofibrils: Physicochemical characteristics, emulsifying and foaming activities. Int J Biol Macromol 2024; 271:132549. [PMID: 38782331 DOI: 10.1016/j.ijbiomac.2024.132549] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2023] [Revised: 05/15/2024] [Accepted: 05/20/2024] [Indexed: 05/25/2024]
Abstract
Bovine serum albumin nanofibrils (BSNs) were fabricated under thermal treatment (85 °C) at acidic condition (pH 2.0) and the incubation time on the structural, and physicochemical characteristics were probed. The formation and development of BSNs have been detected and confirmed by Thioflavin T (ThT) fluorescence and circular dichroism (CD) measurements. The structural alterations of bovine serum albumin (BSA) have also been investigated using intrinsic fluorescence and Congo red (CGR) UV-vis spectroscopy. Atomic force microscopy (AFM) outcomes displayed the morphologies of BSNs at varied time, with a diameter of about 3 nm and a contour length of about 200 nm at 24 h. The apparent viscosities of BSNs at three different pH were in the following order: pH 3.0 > pH 5.0 > pH 7.0. Emulsifying and foaming properties of BSA were pronouncedly enhanced through fibrillation, which was highly correlated with the interfacial properties and structural characteristics. Highest EAI 54.2 m2/g was attained at 48 h and no pronounced alterations were observed for EAI at 24 h and 48 h. Maximum value of FC was obtained at 48 h for BSA. This study will provide some useful information in understanding the formation of BSNs and broaden their application in food systems as functional food ingredients.
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Affiliation(s)
- Yuting Fan
- School of Public Health, Shenzhen University Medical School, Shenzhen University, Shenzhen, 518055, China
| | - Chao Gan
- Shenzhen Key Laboratory of Food Macromolecules Science and Processing, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China
| | - Yanmei Li
- Yining Customs Technology Center, Yining, Xinjiang 835000, China
| | - Ling Kang
- Shenzhen Key Laboratory of Food Macromolecules Science and Processing, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China
| | - Jiang Yi
- Shenzhen Key Laboratory of Food Macromolecules Science and Processing, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China.
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2
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Zhang B, Jiang R, Dong K, Li J, Zhang Y, Ghorani B, Emadzadeh B, Nishinari K, Yang N. Controlling Solvent Polarity to Regulate Protein Self-Assembly Morphology and Its Universal Insight for Fibrillation Mechanism. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:7733-7746. [PMID: 38538620 DOI: 10.1021/acs.langmuir.4c00438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/10/2024]
Abstract
The mechanism of ethanol-induced fibrillation of β-lactoglobulin (β-lg) in the acidic aqueous solution upon heating was investigated using various techniques, mainly thioflavin T fluorescence, atomic force microscopy, nonreducing electrophoresis, mass spectrometry, Fourier transform infrared spectroscopy, and circular dichroism spectroscopy. The results showed that fibrillation occurred with a heating time increase, but high ethanol content slowed down the process. At a low ethanol volume fraction, peptides existed after heating for 2 h, with long and straight fibrils formed after 4-6 h, while at a high ethanol volume fraction, the proteins aggregated with very few peptides appeared at the early stage of heating, and short and curved fibrils formed after heating for 8 h. Ethanol weakened the hydrophobic interactions between proteins in the aqueous solution; therefore the latter could not completely balance the electrostatic repulsion, and thus suppressing the fibrillation process. It is believed that the fibrillation of β-lg in the acidic solution upon heating is mainly dominated by the polypeptide model; however, ethanol inhibited the hydrolysis of proteins, and the self-assembly mechanism changed to the monomer model.
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Affiliation(s)
- Bao Zhang
- Glyn O. Phillips Hydrocolloid Research Centre, National "111″ Center for Cellular Regulation and Molecular Pharmaceutics, Key Laboratory of Fermentation Engineering of Ministry of Education, Key Laboratory of Industrial Microbiology in Hubei Province, Department of Bioengineering and Food Science, Hubei University of Technology, Wuhan 430068, China
| | - Ruisheng Jiang
- Glyn O. Phillips Hydrocolloid Research Centre, National "111″ Center for Cellular Regulation and Molecular Pharmaceutics, Key Laboratory of Fermentation Engineering of Ministry of Education, Key Laboratory of Industrial Microbiology in Hubei Province, Department of Bioengineering and Food Science, Hubei University of Technology, Wuhan 430068, China
| | - Kexin Dong
- Glyn O. Phillips Hydrocolloid Research Centre, National "111″ Center for Cellular Regulation and Molecular Pharmaceutics, Key Laboratory of Fermentation Engineering of Ministry of Education, Key Laboratory of Industrial Microbiology in Hubei Province, Department of Bioengineering and Food Science, Hubei University of Technology, Wuhan 430068, China
| | - Jing Li
- Glyn O. Phillips Hydrocolloid Research Centre, National "111″ Center for Cellular Regulation and Molecular Pharmaceutics, Key Laboratory of Fermentation Engineering of Ministry of Education, Key Laboratory of Industrial Microbiology in Hubei Province, Department of Bioengineering and Food Science, Hubei University of Technology, Wuhan 430068, China
| | - Yan Zhang
- Glyn O. Phillips Hydrocolloid Research Centre, National "111″ Center for Cellular Regulation and Molecular Pharmaceutics, Key Laboratory of Fermentation Engineering of Ministry of Education, Key Laboratory of Industrial Microbiology in Hubei Province, Department of Bioengineering and Food Science, Hubei University of Technology, Wuhan 430068, China
- Food Hydrocolloid International Science and Technology Cooperation Base of Hubei Province, Hubei University of Technology, Wuhan 430068, China
| | - Behrouz Ghorani
- Department of Food Nanotechnology, Research Institute of Food Science & Technology (RIFST), Mashhad 91895-157-356, Iran
| | - Bahareh Emadzadeh
- Department of Food Nanotechnology, Research Institute of Food Science & Technology (RIFST), Mashhad 91895-157-356, Iran
| | - Katsuyoshi Nishinari
- Glyn O. Phillips Hydrocolloid Research Centre, National "111″ Center for Cellular Regulation and Molecular Pharmaceutics, Key Laboratory of Fermentation Engineering of Ministry of Education, Key Laboratory of Industrial Microbiology in Hubei Province, Department of Bioengineering and Food Science, Hubei University of Technology, Wuhan 430068, China
- Food Hydrocolloid International Science and Technology Cooperation Base of Hubei Province, Hubei University of Technology, Wuhan 430068, China
| | - Nan Yang
- Glyn O. Phillips Hydrocolloid Research Centre, National "111″ Center for Cellular Regulation and Molecular Pharmaceutics, Key Laboratory of Fermentation Engineering of Ministry of Education, Key Laboratory of Industrial Microbiology in Hubei Province, Department of Bioengineering and Food Science, Hubei University of Technology, Wuhan 430068, China
- Food Hydrocolloid International Science and Technology Cooperation Base of Hubei Province, Hubei University of Technology, Wuhan 430068, China
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Zheng Y, Gao Y, Chang Y, Sun C, Fang Y. Concentration-Regulated Fibrillation of Soy Protein: Structure and In Vitro Digestion. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023. [PMID: 37433090 DOI: 10.1021/acs.jafc.3c02206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/13/2023]
Abstract
The impact of protein types, heating temperatures, and times on protein fibrillation has been widely studied. However, there is little understanding of the influence of protein concentration (PC) on the protein fibril assembly. In this work, the structure and in vitro digestibility of soy protein amyloid fibrils (SAFs) were investigated at pH 2.0 and different PCs. Significant increases in fibril conversion rate and parallel β-sheets proportion were observed in SAFs upon increasing the PC from 2 to 8% (w/v). The AFM images showed that curly fibrils were prone to form at 2-6% PCs, while rigid, straight fibrils developed at higher PCs (≥8%). As evidenced in XRD results, increasing PC led to a more stable structure of SAFs with enhanced thermal stability and lower digestibility. Moreover, positive correlations among PC, β-sheet content, persistence length, enthalpy, and total hydrolysis were established. These findings would provide valuable insights into concentration-regulated protein fibrillation.
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Affiliation(s)
- Yixin Zheng
- Department of Food Science and Technology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Yixin Gao
- Department of Food Science and Technology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Yuyang Chang
- Department of Food Science and Technology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Cuixia Sun
- Department of Food Science and Technology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Yapeng Fang
- Department of Food Science and Technology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China
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4
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Mijin N, Milošević J, Stevanović S, Petrović P, Lolić A, Urbic T, Polović N. Amyloid-like aggregation influenced by lead(II) and cadmium(II) ions in hen egg white ovalbumin. Food Hydrocoll 2022. [DOI: 10.1016/j.foodhyd.2022.108292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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5
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Adsorption of microgel aggregates formed by assembly of gliadin nanoparticles and a β-lactoglobulin fibril-peptide mixture at the air/water interface: Surface morphology and foaming behavior. Food Hydrocoll 2022. [DOI: 10.1016/j.foodhyd.2021.107039] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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6
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Acidic and Heat Processing of Egg Yolk Dispersions. Processes (Basel) 2021. [DOI: 10.3390/pr9101842] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Egg yolk is a multifunctional ingredient widely used in many food products, wherein proteins are the dominant component contributing to this functionality. However, the potential risk of foodborne illness associated with egg use forces us to ensure that foodstuffs based on egg yolk are managed in a safe and sanitary manner. Lowering the pH under a certain value by adding acids could serve this purpose, but it can also greatly modify the rheological and functional properties of egg yolk. This research aims to assess the influence of citric acid on the rheological properties and microstructure of chicken egg yolk dispersions and their heat-set gels. The dispersions were prepared from fresh hen’s eggs yolks by adding water or citric acid to obtain a technical yolk (45 wt.% in solids) at the desired pH value. Viscoelastic measurements were carried out using a control stress rheometer, and microstructure was evaluated by cryo-scanning electronic microscopy (CryoSEM). An evolution of the viscoelastic properties of egg yolk dispersions from fluid to gel behavior was observed as the pH decreased until 2 but showing a predominantly fluid behavior at pH 3. The profile of viscoelastic properties along the thermal cycle applied is modified to a great extent, also showing a strong dependence on pH. Thus, the sol–gel transition can be modulated by the pH value.
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7
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Bagnani M, Azzari P, De Michele C, Arcari M, Mezzenga R. Elastic constants of biological filamentous colloids: estimation and implications on nematic and cholesteric tactoid morphologies. SOFT MATTER 2021; 17:2158-2169. [PMID: 33443281 DOI: 10.1039/d0sm01886d] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Biological liquid crystals, originating from the self-assembly of biological filamentous colloids, such as cellulose and amyloid fibrils, show a complex lyotropic behaviour that is extremely difficult to predict and characterize. Here we analyse the liquid crystalline phases of amyloid fibrils, and sulfated and carboxylated cellulose nanocrystals and measure their Frank-Oseen elastic constants K1, K2 and K3 by four different approaches. The first two approaches are based on the benchmark of the predictions of: (i) a scaling form and (ii) a variational form of the Frank-Oseen energy functional with the experimental critical volumes at order-order liquid crystalline transitions of the tactoids. The third and the fourth methods imply: (iii) the direct scaling equations of elastic constants and (iv) a molecular theory predicting the elastic constants from the experimentally accessible contour length distributions of the filamentous colloids. These three biological systems exhibit diverse liquid crystalline behaviour, governed by the distinct elastic constants characterizing each colloid. Differences and similarities among the three systems are highlighted and interpreted based on the present analysis, providing a general framework to study dispersed liquid crystalline systems.
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Affiliation(s)
- Massimo Bagnani
- ETH Zurich, Department of Health Sciences and Technology, Schmelzbergstrasse 9, LFO E23 Zurich 8092, Switzerland
| | - Paride Azzari
- ETH Zurich, Department of Health Sciences and Technology, Schmelzbergstrasse 9, LFO E23 Zurich 8092, Switzerland
| | - Cristiano De Michele
- "Sapienza" Universita' di Roma, Dipartimento di Fisica, P.le A. Moro 2, 00185 Roma, Italy
| | - Mario Arcari
- ETH Zurich, Department of Health Sciences and Technology, Schmelzbergstrasse 9, LFO E23 Zurich 8092, Switzerland
| | - Raffaele Mezzenga
- ETH Zurich, Department of Health Sciences and Technology, Schmelzbergstrasse 9, LFO E23 Zurich 8092, Switzerland and ETH Zurich, Department of Materials, Wolfgang-Pauli-Strasse 10, Zurich 8093, Switzerland.
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8
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Kang N, Hua J, Gao L, Zhang B, Pang J. The Interplay between Whey Protein Fibrils with Carbon Nanotubes or Carbon Nano-Onions. MATERIALS (BASEL, SWITZERLAND) 2021; 14:608. [PMID: 33525699 PMCID: PMC7865974 DOI: 10.3390/ma14030608] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 01/18/2021] [Accepted: 01/22/2021] [Indexed: 12/30/2022]
Abstract
Whey protein isolate (WPI) fibrils were prepared using an acid hydrolysis induction process. Carbon nanotubes (CNTs) and carbon nano-onions (CNOs) were made via the catalytic chemical vapor deposition (CVD) of methane. WPI fibril-CNTs and WPI fibril-CNOs were prepared via hydrothermal synthesis at 80 °C. The composites were characterized by SEM, TEM, FTIR, XRD, Raman, and TG analyses. The interplay between WPI fibrils and CNTs and CNOs were studied. The WPI fibrils with CNTs and CNOs formed uniform gels and films. CNTs and CNOs were highly dispersed in the gels. Hydrogels of WPI fibrils with CNTs (or CNOs) could be new materials with applications in medicine or other fields. The CNTs and CNOs shortened the WPI fibrils, which might have important research value for curing fibrosis diseases such as Parkinson's and Alzheimer's diseases. The FTIR revealed that CNTs and CNOs both had interactions with WPI fibrils. The XRD analysis suggested that most of the CNTs were wrapped in WPI fibrils, while CNOs were partially wrapped. This helped to increase the biocompatibility and reduce the cytotoxicity of CNTs and CNOs. HR-TEM and Raman spectroscopy studies showed that the graphitization level of CNTs was higher than for CNOs. After hybridization with WPI fibrils, more defects were created in CNTs, but some original defects were dismissed in CNOs. The TG results indicated that a new phase of WPI fibril-CNTs or CNOs was formed.
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Affiliation(s)
- Ning Kang
- College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
- Taiyuan Customs District, Taiyuan 030006, China;
| | - Jin Hua
- Taiyuan Customs District, Taiyuan 030006, China;
| | - Lizhen Gao
- College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
| | - Bin Zhang
- Key Laboratory of Coal Science, Technology of the Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
| | - Jiewen Pang
- College of Environment and Safety, Taiyuan University of Science and Technology, Taiyuan 030024, China;
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9
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Kharlamova A, Nicolai T, Chassenieux C. Gelation of whey protein fractal aggregates induced by the interplay between added HCl, CaCl2 and NaCl. Int Dairy J 2020. [DOI: 10.1016/j.idairyj.2020.104824] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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10
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Preparation of a Hybrid Membrane from Whey Protein Fibrils and Activated Carbon to Remove Mercury and Chromium from Water. MEMBRANES 2020; 10:membranes10120386. [PMID: 33266234 PMCID: PMC7760280 DOI: 10.3390/membranes10120386] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Revised: 11/10/2020] [Accepted: 11/25/2020] [Indexed: 12/07/2022]
Abstract
Water contamination by mercury and chromium has a direct effect in human health. A promising technology to remove heavy metals by membrane filtration is the use of hybrid membranes produced with whey protein fibrils (WPF) and activated carbon (AC). In this study, the best conditions to produce WPF by heat treatment were determined to maximize the removal of mercury and chromium from water using a central composed design. The results indicated that the best conditions to prepare WPF were 74 °C, 7 h and 3.8% of whey protein with adsorption capacities of 25 and 18 mg/g and removal efficiencies of 81 and 57% for mercury and chromium, respectively. WPF and AC were used to prepare a hybrid membrane that was characterized using transmission electron microscopy, atomic force microscopy, scanning electron microscopy, Fourier transform infrared spectroscopy and Brunauer-Emmett-Teller surface area measurements. Batch filtration experiments were performed with the hybrid membrane for chromium and mercury removal at 25, 50 and 100 mg/L to determine its adsorption capacities. A high performance of the hybrid membrane was demonstrated removing efficiently mercury and chromium from water, thus supporting more than ten filtration cycles.
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11
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Belwal VK, Chaudhary N. Amyloids and their untapped potential as hydrogelators. SOFT MATTER 2020; 16:10013-10028. [PMID: 33146652 DOI: 10.1039/d0sm01578d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Amyloid fibrils are cross-β-sheet-rich fibrous aggregates. They were originally identified as disease-associated protein/peptide deposits. The cross-β motif was consequently labelled as an alien and pathogenic fold. Subsequent research revealed that the fibrillar aggregates were benign, and the cytotoxicity in the amyloid diseases was attributed to the pre-fibrillar structures. Research in the past two decades has identified the native functional amyloids in organisms ranging from bacteria to human. The amyloid-like fibrils, therefore, are not necessarily pathogenic, and the cross-β motif is very much native. This premise makes way for the amyloids to be used as biocompatible materials. Many naturally occurring amyloidogenic proteins/peptides or their fragments have been reported in the literature to form hydrogels. Hydrogels constitute one of the most interesting classes of soft materials that find application in diverse fields such as environmental, electronic, and biomedical engineering. Applications of hydrogels in medicine are particularly extensive. Among various classes of peptides that form hydrogels, the potential of amyloids is largely untapped. In this review, we have attempted to compile the literature on amyloid hydrogels and discuss their potential applications.
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Affiliation(s)
- Vinay Kumar Belwal
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati - 781 039, India.
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12
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Effect of pH and protein particle shape on the stability of amylopectin–xyloglucan water-in-water emulsions. Food Hydrocoll 2020. [DOI: 10.1016/j.foodhyd.2020.105769] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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13
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Seleno-β-lactoglobulin (Se-β-Lg) induces mitochondria-dependant apoptosis in HepG2 cells. Mol Biol Rep 2019; 46:5025-5031. [PMID: 31364020 DOI: 10.1007/s11033-019-04953-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2019] [Accepted: 06/27/2019] [Indexed: 12/31/2022]
Abstract
Selenium compounds have been widely investigated as novel anticancer agents due to high efficacy and selectivity against cancer cells in recent years. This study aimed to research the potential inhibitory effects of seleno-β-lactoglobulin (Se-β-Lg) on HepG2 cells in vitro. MTT results demonstrated that the synthetized Se-β-Lg exhibited strong antitumor activity on HepG2 cells with few side effects on human normal cells (LO2) and relatively weaker cytotoxic effects compared to inorganic selenium (SeO2). Scanning electron microscope (SEM), hoechst 33342/PI double staining, annexin V-FITC/PI staining and cell cycle detection results showed that Se-β-Lg could induce the apoptosis of HepG2 cells via arresting them in S and G2/M phases and lead to the obvious morphological changes (loss of adhesion, cell shrinkage, and membrane blebbing, membrane permeabilities and DNA fragmentation). Besides, JC-1 staining, western blotting (WB) and polymerase chain reaction (PCR) results showed that Se-β-Lg could gradually destroy the mitochondrial membrane potential of HepG2 cells, and finally resulting in the mitochondria-dependant apoptosis via up-regulation of Bax, Cytochrome c, Caspase-3 and down-regulation of Bcl-2. Our data could provide a theoretical basis for practical application of Se-β-Lg in food and drug industries.
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14
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Cao Y, Mezzenga R. Food protein amyloid fibrils: Origin, structure, formation, characterization, applications and health implications. Adv Colloid Interface Sci 2019; 269:334-356. [PMID: 31128463 DOI: 10.1016/j.cis.2019.05.002] [Citation(s) in RCA: 244] [Impact Index Per Article: 48.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Revised: 04/30/2019] [Accepted: 05/01/2019] [Indexed: 01/27/2023]
Abstract
Amyloid fibrils have traditionally been considered only as pathological aggregates in human neurodegenerative diseases, but it is increasingly becoming clear that the propensity to form amyloid fibrils is a generic property for all proteins, including food proteins. Differently from the pathological amyloid fibrils, those derived from food proteins can be used as advanced materials in biomedicine, tissue engineering, environmental science, nanotechnology, material science as well as in food science, owing to a combination of highly desirable feature such as extreme aspect ratios, outstanding stiffness and a broad availability of functional groups on their surfaces. In food science, protein fibrillization is progressively recognized as an appealing strategy to broaden and improve food protein functionality. This review article discusses the various classes of reported food protein amyloid fibrils and their formation conditions. It furthermore considers amyloid fibrils in a broad context, from their structural characterization to their forming mechanisms and ensued physical properties, emphasizing their applications in food-related fields. Finally, the biological fate and the potential toxicity mechanisms of food amyloid fibrils are discussed, and an experimental protocol for their health safety validation is proposed in the concluding part of the review.
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Affiliation(s)
- Yiping Cao
- Food and Soft Materials, Institute of Food, Nutrition and Health, ETH Zurich, Schmelzbergstrasse 9, Zurich 8092, Switzerland
| | - Raffaele Mezzenga
- Food and Soft Materials, Institute of Food, Nutrition and Health, ETH Zurich, Schmelzbergstrasse 9, Zurich 8092, Switzerland.
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15
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Lambrecht MA, Jansens KJ, Rombouts I, Brijs K, Rousseau F, Schymkowitz J, Delcour JA. Conditions Governing Food Protein Amyloid Fibril Formation. Part II: Milk and Legume Proteins. Compr Rev Food Sci Food Saf 2019; 18:1277-1291. [DOI: 10.1111/1541-4337.12465] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 04/26/2019] [Accepted: 05/16/2019] [Indexed: 02/06/2023]
Affiliation(s)
- Marlies A. Lambrecht
- Laboratory of Food Chemistry and Biochemistry and Leuven Food Science and Nutrition Research Centre (LFoRCe)KU Leuven Kasteelpark Arenberg 20 B‐3001 Leuven Belgium
| | - Koen J.A. Jansens
- Laboratory of Food Chemistry and Biochemistry and Leuven Food Science and Nutrition Research Centre (LFoRCe)KU Leuven Kasteelpark Arenberg 20 B‐3001 Leuven Belgium
| | - Ine Rombouts
- Laboratory of Food Chemistry and Biochemistry and Leuven Food Science and Nutrition Research Centre (LFoRCe)KU Leuven Kasteelpark Arenberg 20 B‐3001 Leuven Belgium
| | - Kristof Brijs
- Laboratory of Food Chemistry and Biochemistry and Leuven Food Science and Nutrition Research Centre (LFoRCe)KU Leuven Kasteelpark Arenberg 20 B‐3001 Leuven Belgium
| | - Frederic Rousseau
- Switch LaboratoryVIB B‐3000 Leuven Belgium
- Dept. of Cellular and Molecular MedicineKU Leuven B‐3000 Leuven Belgium
| | - Joost Schymkowitz
- Switch LaboratoryVIB B‐3000 Leuven Belgium
- Dept. of Cellular and Molecular MedicineKU Leuven B‐3000 Leuven Belgium
| | - Jan A. Delcour
- Laboratory of Food Chemistry and Biochemistry and Leuven Food Science and Nutrition Research Centre (LFoRCe)KU Leuven Kasteelpark Arenberg 20 B‐3001 Leuven Belgium
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16
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Peng J, Calabrese V, Geurtz J, Velikov KP, Venema P, van der Linden E. Composite Gels Containing Whey Protein Fibrils and Bacterial Cellulose Microfibrils. J Food Sci 2019; 84:1094-1103. [PMID: 31038744 PMCID: PMC6593742 DOI: 10.1111/1750-3841.14509] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Revised: 12/18/2018] [Accepted: 02/18/2019] [Indexed: 11/29/2022]
Abstract
In this study, we investigated the gelation of WPI fibrils in the presence of bacterial cellulose (BC) microfibrils at pH 2 upon prolonged heating. Rheology and microstructure were investigated as a function of BC microfibril concentration. The presence of BC microfibrils did not influence the gelation dynamics and resulting overall structure of the WPI fibrillar gel. The storage modulus and loss modulus of the mixed WPI‐BC microfibril gels increased with increasing BC microfibril concentration, whereas the ratio between loss modulus and storage modulus remained constant. The WPI fibrils and BC microfibrils independently form two coexisting gel networks. Interestingly, near to the BC microfibrils more aligned WPI fibrils seemed to be formed, with individual WPI fibrils clearly distinguishable. The level of alignment of the WPI fibrils seemed to be dependent on the distance between BC microfibrils and WPI fibrils. This also is in line with our observation that with more BC microfibrils present, WPI fibrils are more aligned than in a WPI fibrillar gel without BC microfibrils. The large deformation response of the gels at different BC microfibril concentration and NaCl concentration is mainly influenced by the concentration of NaCl, which affects the WPI fibrillar gel structures, changing form linear fibrillar to a particulate gel. The WPI fibrillar gel yields the dominant contribution to the gel strength.
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Affiliation(s)
- Jinfeng Peng
- Physics and Physical Chemistry of Foods, Dept. of Agrotechnology and Food Sciences, Wageningen Univ., P.O. Box 17, 6700 AA, Wageningen, The Netherlands
| | - Vincenzo Calabrese
- Physics and Physical Chemistry of Foods, Dept. of Agrotechnology and Food Sciences, Wageningen Univ., P.O. Box 17, 6700 AA, Wageningen, The Netherlands
| | - Julia Geurtz
- Physics and Physical Chemistry of Foods, Dept. of Agrotechnology and Food Sciences, Wageningen Univ., P.O. Box 17, 6700 AA, Wageningen, The Netherlands
| | - Krassimir P Velikov
- Unilever R&D Vlaardingen, Olivier van Noortlaan, 120, 3133 AT, Vlaardingen, The Netherlands.,Inst. of Physics, Univ. of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands.,Soft Condensed Matter, Debye Institute for NanoMaterials Science, Utrecht Univ., Princetonplein 5, 3584 CC, Utrecht, The Netherlands
| | - Paul Venema
- Physics and Physical Chemistry of Foods, Dept. of Agrotechnology and Food Sciences, Wageningen Univ., P.O. Box 17, 6700 AA, Wageningen, The Netherlands
| | - Erik van der Linden
- Physics and Physical Chemistry of Foods, Dept. of Agrotechnology and Food Sciences, Wageningen Univ., P.O. Box 17, 6700 AA, Wageningen, The Netherlands
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Amyloid fibril-directed synthesis of silica core-shell nanofilaments, gels, and aerogels. Proc Natl Acad Sci U S A 2019; 116:4012-4017. [PMID: 30782823 DOI: 10.1073/pnas.1819640116] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Amyloid fibrils have evolved from purely pathological materials implicated in neurodegenerative diseases to efficient templates for last-generation functional materials and nanotechnologies. Due to their high intrinsic stiffness and extreme aspect ratio, amyloid fibril hydrogels can serve as ideal building blocks for material design and synthesis. Yet, in these gels, stiffness is generally not paired by toughness, and their fragile nature hinders significantly their widespread application. Here we introduce an amyloid-assisted biosilicification process, which leads to the formation of silicified nanofibrils (fibril-silica core-shell nanofilaments) with stiffness up to and beyond ∼20 GPa, approaching the Young's moduli of many metal alloys and inorganic materials. The silica shell endows the silicified fibrils with large bending rigidity, reflected in hydrogels with elasticity three orders of magnitude beyond conventional amyloid fibril hydrogels. A constitutive theoretical model is proposed that, despite its simplicity, quantitatively interprets the nonmonotonic dependence of the gel elasticity upon the filaments bundling promoted by shear stresses. The application of these hybrid silica-amyloid hydrogels is demonstrated on the fabrication of mechanically stable aerogels generated via sequential solvent exchange, supercritical [Formula: see text] removal, and calcination of the amyloid core, leading to aerogels of specific surface area as high as 993 [Formula: see text]/g, among the highest values ever reported for aerogels. We finally show that the scope of amyloid hydrogels can be expanded considerably by generating double networks of amyloid and hydrophilic polymers, which combine excellent stiffness and toughness beyond those of each of the constitutive individual networks.
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18
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Loveday SM, Gunning AP. Nanomechanics of Pectin-Linked β-Lactoglobulin Nanofibril Bundles. Biomacromolecules 2018; 19:2834-2840. [DOI: 10.1021/acs.biomac.8b00408] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Simon M. Loveday
- Food and Bio-based
Products Group, AgResearch Limited, Private Bag 11008, Palmerston North, 4442, New Zealand
- Riddet Institute Centre of Research Excellence, Massey University, Palmerston North 4442, New Zealand
| | - A. Patrick Gunning
- Quadram Institute Bioscience, Norwich Research
Park, Norwich, Norfolk NR4 7UA, U.K
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19
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Cao Y, Bolisetty S, Adamcik J, Mezzenga R. Elasticity in Physically Cross-Linked Amyloid Fibril Networks. PHYSICAL REVIEW LETTERS 2018; 120:158103. [PMID: 29756901 DOI: 10.1103/physrevlett.120.158103] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Revised: 02/02/2018] [Indexed: 05/25/2023]
Abstract
We provide a constitutive model of semiflexible and rigid amyloid fibril networks by combining the affine thermal model of network elasticity with the Derjaguin-Landau-Vervey-Overbeek (DLVO) theory of electrostatically charged colloids. When compared to rheological experiments on β-lactoglobulin and lysozyme amyloid networks, this approach provides the correct scaling of elasticity versus both concentration (G∼c^{2.2} and G∼c^{2.5} for semiflexible and rigid fibrils, respectively) and ionic strength (G∼I^{4.4} and G∼I^{3.8} for β-lactoglobulin and lysozyme, independent from fibril flexibility). The pivotal role played by the screening salt is to reduce the electrostatic barrier among amyloid fibrils, converting labile physical entanglements into long-lived cross-links. This gives a power-law behavior of G with I having exponents significantly larger than in other semiflexible polymer networks (e.g., actin) and carrying DLVO traits specific to the individual amyloid fibrils.
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Affiliation(s)
- Yiping Cao
- Department of Health Sciences and Technology, ETH Zurich, Schmelzbergstrasse 9, Zurich 8092, Switzerland
| | - Sreenath Bolisetty
- Department of Health Sciences and Technology, ETH Zurich, Schmelzbergstrasse 9, Zurich 8092, Switzerland
| | - Jozef Adamcik
- Department of Health Sciences and Technology, ETH Zurich, Schmelzbergstrasse 9, Zurich 8092, Switzerland
| | - Raffaele Mezzenga
- Department of Health Sciences and Technology, ETH Zurich, Schmelzbergstrasse 9, Zurich 8092, Switzerland
- Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, Zurich 8093, Switzerland
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20
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Revealing the structure of high-water content biopolymer networks: Diminishing freezing artefacts in cryo-SEM images. Food Hydrocoll 2017. [DOI: 10.1016/j.foodhyd.2017.06.040] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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21
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22
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Ng SK, Nyam KL, Lai OM, Nehdi IA, Chong GH, Tan CP. Development of a palm olein oil-in-water (o/w) emulsion stabilized by a whey protein isolate nanofibrils-alginate complex. Lebensm Wiss Technol 2017. [DOI: 10.1016/j.lwt.2017.04.050] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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23
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24
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Lam CWY, Ikeda S. Physical Properties of Heat-induced Whey Protein Aggregates Formed at pH 5.5 and 7.0. FOOD SCIENCE AND TECHNOLOGY RESEARCH 2017. [DOI: 10.3136/fstr.23.595] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
| | - Shinya Ikeda
- Department of Food Science, University of Wisconsin-Madison
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25
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Park JH, Sut TN, Jackman JA, Ferhan AR, Yoon BK, Cho NJ. Controlling adsorption and passivation properties of bovine serum albumin on silica surfaces by ionic strength modulation and cross-linking. Phys Chem Chem Phys 2017; 19:8854-8865. [DOI: 10.1039/c7cp01310h] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Understanding the physicochemical factors that influence protein adsorption onto solid supports holds wide relevance for fundamental insights into protein structure and function as well as for applications such as surface passivation.
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Affiliation(s)
- Jae Hyeon Park
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore
- Centre for Biomimetic Sensor Science
- Nanyang Technological University
| | - Tun Naw Sut
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore
- Centre for Biomimetic Sensor Science
- Nanyang Technological University
| | - Joshua A. Jackman
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore
- Centre for Biomimetic Sensor Science
- Nanyang Technological University
| | - Abdul Rahim Ferhan
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore
- Centre for Biomimetic Sensor Science
- Nanyang Technological University
| | - Bo Kyeong Yoon
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore
- Centre for Biomimetic Sensor Science
- Nanyang Technological University
| | - Nam-Joon Cho
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore
- Centre for Biomimetic Sensor Science
- Nanyang Technological University
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26
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27
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Mortensen DN, Williams ER. Surface-Induced Protein Unfolding in Submicron Electrospray Emitters. Anal Chem 2016; 88:9662-9668. [PMID: 27615434 DOI: 10.1021/acs.analchem.6b02499] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The charging of protein ions formed by nanoelectrospray ionization (nanoESI) with tips that are between 1.5 μm and 250 nm in outer diameter is compared. More charging is obtained with the smaller tip sizes for proteins that have a net positive charge in solution, and additional high-charge-state distributions are often observed. A single charge-state distribution of holo-myoglobin ions is produced by nanoESI from a slightly acidified aqueous solution with the micron outer diameter tips, but some apo-myoglobin ions are produced with the submicron tips. In contrast, the charge-state distributions for proteins with a net negative charge in solution do not depend on tip size. Both the formation of high charge states and the appearance of higher-charge-state distributions, as well as the loss of the heme group from myoglobin, indicate that a fraction of the protein population is unfolding with the smaller tips. The increased charging with the smaller tip sizes for proteins with a net positive charge but not for proteins with a net negative charge indicates that the unfolding occurs prior to nanoelectrospray ionization as a result of Coulombic attraction between positively charged protein molecules in solution and the glass surfaces of the emitter tips that are negatively charged. These results demonstrate a novel method for producing highly charged protein ions that does not require exposing the proteins to additional chemicals either in solution or in the gas phase.
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Affiliation(s)
- Daniel N Mortensen
- Department of Chemistry, University of California , Berkeley, California 94720-1460, United States
| | - Evan R Williams
- Department of Chemistry, University of California , Berkeley, California 94720-1460, United States
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28
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Cai B, Ikeda S. Effects of the conjugation of whey proteins with gellan polysaccharides on surfactant-induced competitive displacement from the air-water interface. J Dairy Sci 2016; 99:6026-6035. [DOI: 10.3168/jds.2015-10765] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Accepted: 05/01/2016] [Indexed: 11/19/2022]
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29
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Knowles TPJ, Mezzenga R. Amyloid Fibrils as Building Blocks for Natural and Artificial Functional Materials. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2016; 28:6546-61. [PMID: 27165397 DOI: 10.1002/adma.201505961] [Citation(s) in RCA: 341] [Impact Index Per Article: 42.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Revised: 03/15/2016] [Indexed: 05/20/2023]
Abstract
Proteinaceous materials based on the amyloid core structure have recently been discovered at the origin of biological functionality in a remarkably diverse set of roles, and attention is increasingly turning towards such structures as the basis of artificial self-assembling materials. These roles contrast markedly with the original picture of amyloid fibrils as inherently pathological structures. Here we outline the salient features of this class of functional materials, both in the context of the functional roles that have been revealed for amyloid fibrils in nature, as well as in relation to their potential as artificial materials. We discuss how amyloid materials exemplify the emergence of function from protein self-assembly at multiple length scales. We focus on the connections between mesoscale structure and material function, and demonstrate how the natural examples of functional amyloids illuminate the potential applications for future artificial protein based materials.
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Affiliation(s)
- Tuomas P J Knowles
- Department of Chemistry, University of Cambridge, Lensfield Road, CB2 1EW, Cambridge, United Kingdom
| | - Raffaele Mezzenga
- Department of Health Sciences and Technology, ETH Zurich, Switzerland
- Department of Materials Science, ETH Zurich, Switzerland
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30
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Xu HH, Wang J, Dong SR, Cheng W, Kong BH, Tan JY. Acid-responsive properties of fibrils from heat-induced whey protein concentrate. J Dairy Sci 2016; 99:6052-6060. [PMID: 27265171 DOI: 10.3168/jds.2015-10823] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2015] [Accepted: 04/28/2016] [Indexed: 11/19/2022]
Abstract
The heat-induced fibrils of whey protein concentrate (WPC) have demonstrated an acid-responsive property; that is, the fibrils went through formation-depolymerization-reformation as pH was adjusted to 1.8, 6.5, and back to 1.8. We investigated the microstructure, driving force, and thermal stability of 3.0% (wt) WPC nanofibrils adjusted between pH 6.5 and 1.8 twice. The results showed that the nanofibrils had acid-responsive properties and good thermal stability after reheating for 10h at 90°C and adjusting pH from 1.8 to 6.5 to 1.8. The content of WPC fibril aggregates was not much different with the prolongation of heating times during pH variation. Although the nanofibrils' structure could be destroyed only by changing the pH, the essence of this destruction might only form fiber fragments, polymers that would restore a fibrous structure upon returning to pH 1.8. A described model for the acid-responsive assembly of fibrils of WPC was proposed. The fibrils went through formation-depolymerization-reformation by weaker noncovalent interactions (surface hydrophobicity) as pH changed from 1.8 to 6.5 back to 1.8. However, the fibrils lost the acid-responsive properties because much more S-S (disulfide) formation occurred when the solution was adjusted to pH 6.5 and reheated. Meanwhile, fibrils still possessed acid-responsive properties when reheated at pH 1.8, and the content of fibrils slightly increased with a further reduction of α-helix structure.
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Affiliation(s)
- Hong-Hua Xu
- Key Laboratory of Dairy Science, Ministry of Education, Northeast Agricultural University, 150030 Harbin, People's Republic of China.
| | - Jing Wang
- Key Laboratory of Dairy Science, Ministry of Education, Northeast Agricultural University, 150030 Harbin, People's Republic of China
| | - Shi-Rong Dong
- Key Laboratory of Dairy Science, Ministry of Education, Northeast Agricultural University, 150030 Harbin, People's Republic of China
| | - Wen Cheng
- Key Laboratory of Dairy Science, Ministry of Education, Northeast Agricultural University, 150030 Harbin, People's Republic of China
| | - Bao-Hua Kong
- Key Laboratory of Dairy Science, Ministry of Education, Northeast Agricultural University, 150030 Harbin, People's Republic of China
| | - Jun-Yan Tan
- Key Laboratory of Dairy Science, Ministry of Education, Northeast Agricultural University, 150030 Harbin, People's Republic of China
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31
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Dave AC, Loveday SM, Anema SG, Singh H. β-Casein will chaperone β-lactoglobulin during nanofibril assembly, but prefers familiar company at high concentrations. Int Dairy J 2016. [DOI: 10.1016/j.idairyj.2016.02.035] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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32
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Peng J, Kroes-Nijboer A, Venema P, van der Linden E. Stability of colloidal dispersions in the presence of protein fibrils. SOFT MATTER 2016; 12:3514-3526. [PMID: 26961754 DOI: 10.1039/c5sm03101j] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We studied the stability of monodispersed polystyrene latex dispersions with protein fibrils at different concentrations at pH 2 using microscopy and diffusing wave spectroscopy. At low fibril concentrations, fibrils induced bridging flocculation due to the opposite charges between fibrils and the latex particles. At higher fibril concentration the dispersions were stabilized due to steric and/or electrostatic repulsion. Upon further increasing fibril concentration, we find that the dispersion is destabilized again by depletion interaction. At even higher fibril concentration, the dispersions are stabilized again. These dispersions have a higher stability compared to the dispersions without fibrils. Interestingly, these dispersions contain single particles and small clusters of particles that do not grow beyond a certain size. Although the stabilization mechanism is not clear yet, the results from microscopy and diffusing wave spectroscopy point in the direction of a kinetic barrier that depends on fibril concentration.
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Affiliation(s)
- Jinfeng Peng
- Laboratory of Physics and Physical Chemistry of Foods, Department of Agrotechnology and Food Sciences, Wageningen University, P.O. Box 17, 6700 AA, Wageningen, The Netherlands.
| | - Ardy Kroes-Nijboer
- Laboratory of Physics and Physical Chemistry of Foods, Department of Agrotechnology and Food Sciences, Wageningen University, P.O. Box 17, 6700 AA, Wageningen, The Netherlands.
| | - Paul Venema
- Laboratory of Physics and Physical Chemistry of Foods, Department of Agrotechnology and Food Sciences, Wageningen University, P.O. Box 17, 6700 AA, Wageningen, The Netherlands.
| | - Erik van der Linden
- Laboratory of Physics and Physical Chemistry of Foods, Department of Agrotechnology and Food Sciences, Wageningen University, P.O. Box 17, 6700 AA, Wageningen, The Netherlands.
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33
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Impact of stirring speed on β-lactoglobulin fibril formation. Food Sci Biotechnol 2016; 25:15-21. [PMID: 30263481 DOI: 10.1007/s10068-016-0093-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Revised: 01/04/2016] [Accepted: 01/04/2016] [Indexed: 10/21/2022] Open
Abstract
β-Lactoglobulin (β-lg) can produce fibrils that have multi-functional properties. Impacts of different stirring speeds on characteristics of β-lg fibrils as a stable form in β-lg fibril solutions were investigated. Fibril concentration, fibril morphology, turbidity, particle size distribution, zeta potential, and rheological behavior of solutions were studied. Stirring enhanced fibril formation and stability of a fibril solution, in comparison with unstirred solutions. Increasing the stirring speed produced more turbidity and a greater distribution of particle sizes, higher viscosity values, but no differences in zeta potential values of β-lg fibril solutions. However, a high stirring speed is not feasible due to reduction of the fibril yield and changes in fibril morphology.
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34
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Peng J, Simon JR, Venema P, van der Linden E. Protein Fibrils Induce Emulsion Stabilization. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:2164-74. [PMID: 26882086 DOI: 10.1021/acs.langmuir.5b04341] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The behavior of an oil-in-water emulsion was studied in the presence of protein fibrils for a wide range of fibril concentrations by using rheology, diffusing wave spectroscopy, and confocal laser scanning microscopy. Results showed that above a minimum fibril concentration depletion flocculation occurred, leading to oil droplet aggregation and enhanced creaming of the emulsion. Upon further increasing the concentration of the protein fibrils, the emulsions were stabilized. In this stable regime both aggregates of droplets and single droplets are present, and these aggregates are smaller than the aggregates in the flocculated emulsion samples at the lower fibril concentrations. The size of the droplet aggregates in the stabilized emulsions is independent of fibril concentration. In addition, the droplet aggregation was reversible upon dilution both by a pH 2 HCl solution and by a fibril solution at the same concentration. The viscosity of the emulsions containing fibrils was comparable to that of the pure fibril solution. Neither fibril networks nor droplet gel networks were observed in our study. The stabilization mechanism of emulsions containing long protein fibrils at high protein fibril concentrations points toward the mechanism of a kinetic stabilization.
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Affiliation(s)
- Jinfeng Peng
- Laboratory of Physics and Physical Chemistry of Foods, Department of Agrotechnology and Food Sciences, Wageningen University , P.O. Box 17, 6700 AA, Wageningen, The Netherlands
| | - Joana Ralfas Simon
- Laboratory of Physics and Physical Chemistry of Foods, Department of Agrotechnology and Food Sciences, Wageningen University , P.O. Box 17, 6700 AA, Wageningen, The Netherlands
| | - Paul Venema
- Laboratory of Physics and Physical Chemistry of Foods, Department of Agrotechnology and Food Sciences, Wageningen University , P.O. Box 17, 6700 AA, Wageningen, The Netherlands
| | - Erik van der Linden
- Laboratory of Physics and Physical Chemistry of Foods, Department of Agrotechnology and Food Sciences, Wageningen University , P.O. Box 17, 6700 AA, Wageningen, The Netherlands
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35
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Hettiarachchi CA, Melton LD, McGillivray DJ, Loveday SM, Gerrard JA, Williams MAK. β-Lactoglobulin nanofibrils can be assembled into nanotapes via site-specific interactions with pectin. SOFT MATTER 2016; 12:756-768. [PMID: 26517088 DOI: 10.1039/c5sm01530h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Controlling the self-assembly of individual supramolecular entities, such as amyloid fibrils, into hierarchical architectures enables the 'bottom-up' fabrication of useful bionanomaterials. Here, we present the hierarchical assembly of β-lactoglobulin nanofibrils into the form of 'nanotapes' in the presence of a specific pectin with a high degree of methylesterification. The nanotapes produced were highly ordered, and had an average width of 180 nm at pH 3. Increasing the ionic strength or the pH of the medium led to the disassembly of nanotapes, indicating that electrostatic interactions stabilised the nanotape architecture. Small-angle X-ray scattering experiments conducted on the nanotapes showed that adequate space is available between adjacent nanofibrils to accommodate pectin molecules. To locate the interaction sites on the pectin molecule, it was subjected to endopolygalacturonase digestion, and the resulting products were analysed using capillary electrophoresis and size-exclusion chromatography for their charge and molecular weight, respectively. Results suggested that the functional pectin molecules carry short (<10 residues) enzyme-susceptible blocks of negatively charged, non-methylesterified galacturonic acid residues in the middle of their homogalacturonan backbones (and possibly near their ends), that specifically bind to sites on the nanofibrils. Blocking the interaction sites on the nanofibril surface using small oligomers of non-methylesterified galacturonic acid residues similar in size to the interaction sites of the pectin molecule decreased the nanotape formation, indicating that site-specific electrostatic interactions are vital for the cross-linking of nanofibrils. We propose a structural model for the pectin-cross-linked β-lactoglobulin nanotapes, the elements of which will inform the future design of bionanomaterials.
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36
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Nieuwland M, Bouwman WG, Pouvreau L, Martin AH, de Jongh HH. Relating water holding of ovalbumin gels to aggregate structure. Food Hydrocoll 2016. [DOI: 10.1016/j.foodhyd.2015.06.018] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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37
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Eggers S, Fischer B, Abetz V. Aqueous Solutions of Poly[2-(N
-morpholino)ethyl methacrylate]: Learning about Macromolecular Aggregation Processes from a Peculiar Three-Step Thermoresponsive Behavior. MACROMOL CHEM PHYS 2015. [DOI: 10.1002/macp.201500339] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Steffen Eggers
- Institute of Physical Chemistry; University of Hamburg; Martin-Luther-King-Platz 6 20146 Hamburg Germany
| | - Birgit Fischer
- Institute of Physical Chemistry; University of Hamburg; Martin-Luther-King-Platz 6 20146 Hamburg Germany
| | - Volker Abetz
- Institute of Physical Chemistry; University of Hamburg; Martin-Luther-King-Platz 6 20146 Hamburg Germany
- Helmholtz-Zentrum Geesthacht; Institute of Polymer Research; Max-Planck-Straße 1 21502 Geesthacht Germany
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38
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Textural and waterbinding behaviors of β-lactoglobulin-xanthan gum electrostatic hydrogels in relation to their microstructure. Food Hydrocoll 2015. [DOI: 10.1016/j.foodhyd.2015.03.007] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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39
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Rodrigues RM, Martins AJ, Ramos OL, Malcata FX, Teixeira JA, Vicente AA, Pereira RN. Influence of moderate electric fields on gelation of whey protein isolate. Food Hydrocoll 2015. [DOI: 10.1016/j.foodhyd.2014.06.002] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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40
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Sharma R, Furusawa K, Fukui A, Sasaki N. Effects of a flow field on amyloid fibrillogenesis in a β-lactoglobulin solution. Int J Biol Macromol 2014; 70:490-7. [DOI: 10.1016/j.ijbiomac.2014.06.034] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Revised: 06/21/2014] [Accepted: 06/22/2014] [Indexed: 10/25/2022]
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41
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Gilbert J, Campanella O, Jones OG. Electrostatic Stabilization of β-lactoglobulin Fibrils at Increased pH with Cationic Polymers. Biomacromolecules 2014; 15:3119-27. [PMID: 25019592 DOI: 10.1021/bm500762u] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Jay Gilbert
- Purdue University, Department of Food Science, 745 Agriculture Mall Drive, West Lafayette, Indiana 47907, United States
| | - Osvaldo Campanella
- Purdue University, Department of Agricultural and
Biological Engineering, 225 South University Street, West Lafayette, Indiana 47907, United States
| | - Owen G. Jones
- Purdue University, Department of Food Science, 745 Agriculture Mall Drive, West Lafayette, Indiana 47907, United States
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42
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Carpineti L, Martinez MJ, Pilosof AM, Pérez OE. β-Lactoglobulin–carboxymethylcellulose core–shell microparticles: Construction, characterization and isolation. J FOOD ENG 2014. [DOI: 10.1016/j.jfoodeng.2014.01.018] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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43
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Cornacchia L, Forquenot de la Fortelle C, Venema P. Heat-induced aggregation of whey proteins in aqueous solutions below their isoelectric point. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2014; 62:733-741. [PMID: 24364622 DOI: 10.1021/jf404456q] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Processing beverages containing high concentrations of globular proteins represents a technological challenge due to their instability during heating caused by protein aggregation and gelation. Aggregation of whey protein mixtures was investigated in aqueous model systems at pH 3.5, 4.0, and 4.5 at heating conditions resembling conventional industrial treatment (90 °C for 30 s). The extent of aggregation progressively decreased moving away from the pI. Protein aggregates became smaller and had a more open structure compared to higher pH values. Significant loss of protein dispersibility occurred at pH 4.0 and 4.5 above the denaturation T of whey protein (∼70 °C), at which aggregation was caused by intermolecular hydrophobic interactions. Accessible thiol groups were detected in the heat-treated systems, with a higher intensity at higher pH and increasing extent of aggregation. Intermolecular -S-S- bonding played only a minor role in the aggregation at all conditions studied.
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44
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Dave AC, Loveday SM, Anema SG, Jameson GB, Singh H. Modulating β-Lactoglobulin Nanofibril Self-Assembly at pH 2 Using Glycerol and Sorbitol. Biomacromolecules 2013; 15:95-103. [DOI: 10.1021/bm401315s] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Anant C. Dave
- Riddet
Institute, Massey University, Private Bag 11 222, Palmerston North, New Zealand
| | - Simon M. Loveday
- Riddet
Institute, Massey University, Private Bag 11 222, Palmerston North, New Zealand
| | - Skelte G. Anema
- Riddet
Institute, Massey University, Private Bag 11 222, Palmerston North, New Zealand
- Fonterra
Research and Development Centre, Private Bag 11 029, Palmerston North, New Zealand
| | - Geoffrey B. Jameson
- Riddet
Institute, Massey University, Private Bag 11 222, Palmerston North, New Zealand
- Institute
of Fundamental Sciences, Massey University, Private Bag 11 222, Palmerston North, New Zealand
| | - Harjinder Singh
- Riddet
Institute, Massey University, Private Bag 11 222, Palmerston North, New Zealand
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45
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Dave AC, Loveday SM, Anema SG, Loo TS, Norris GE, Jameson GB, Singh H. Β-lactoglobulin self-assembly: structural changes in early stages and disulfide bonding in fibrils. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2013; 61:7817-7828. [PMID: 23848407 DOI: 10.1021/jf401084f] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Bovine β-lactoglobulin (β-Lg) self-assembles into long amyloid-like fibrils when heated at 80 °C, pH 2, and low ionic strength (<0.015 mM). Heating β-Lg under fibril-forming conditions shows a lag phase before fibrils start forming. We have investigated the structural characteristics of β-Lg during the lag phase and the composition of β-Lg fibrils after their separation using ultracentrifugation. During the lag phase, the circular dichroism spectra of heated β-Lg showed rapid unfolding, and sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) of samples showed increasing hydrolysis of β-Lg. The SDS-PAGE profiles of fibrils separated by ultra centrifugation showed that after six hours, the fibrils consisted of a few preferentially accumulated peptides. Two-dimensional SDS-PAGE under reducing and nonreducing conditions showed the presence of disulfide-bonded fragments in the fibrils. The sequences in these peptide bands were characterized by in-gel digestion electrospray ionization (ESI)-MS/MS. The composition of solubilized fibrils was also characterized by matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) MS/MS. Both MS analyses showed that peptides in fibrils were primarily from the N-terminal region, although there was some evidence of peptides from the C-terminal part of the molecule present in the higher molecular weight gel bands. We suggest that although the N-terminal region of β-Lg is almost certainly involved in the formation of the fibrils, other peptide fragments linked through disulfide bonds may also be present in the fibrils during self-assembly.
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Affiliation(s)
- Anant C Dave
- Riddet Institute, Massey University, Private Bag 11 222, Palmerston North, New Zealand
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46
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Nicolai T, Durand D. Controlled food protein aggregation for new functionality. Curr Opin Colloid Interface Sci 2013. [DOI: 10.1016/j.cocis.2013.03.001] [Citation(s) in RCA: 217] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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47
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Phan-Xuan T, Durand D, Nicolai T, Donato L, Schmitt C, Bovetto L. Tuning the Structure of Protein Particles and Gels with Calcium or Sodium Ions. Biomacromolecules 2013; 14:1980-9. [DOI: 10.1021/bm400347d] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tuan Phan-Xuan
- LUNAM Université du Maine, IMMM UMR-CNRS, Polymers, Colloids, Interfaces,
72085 Le Mans Cedex
9, France
| | - Dominique Durand
- LUNAM Université du Maine, IMMM UMR-CNRS, Polymers, Colloids, Interfaces,
72085 Le Mans Cedex
9, France
| | - Taco Nicolai
- LUNAM Université du Maine, IMMM UMR-CNRS, Polymers, Colloids, Interfaces,
72085 Le Mans Cedex
9, France
| | - Laurence Donato
- Food Science
and Technology Department, Nestec, Ltd., Nestlé Research Center, P.O. Box
44, CH-1000 Lausanne 26, Switzerland
| | - Christophe Schmitt
- Food Science
and Technology Department, Nestec, Ltd., Nestlé Research Center, P.O. Box
44, CH-1000 Lausanne 26, Switzerland
| | - Lionel Bovetto
- Food Science
and Technology Department, Nestec, Ltd., Nestlé Research Center, P.O. Box
44, CH-1000 Lausanne 26, Switzerland
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48
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49
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Wang W, Zhong Q, Hu Z. Nanoscale understanding of thermal aggregation of whey protein pretreated by transglutaminase. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2013; 61:435-46. [PMID: 23252670 DOI: 10.1021/jf304506n] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Nanoscale structures of whey protein isolate (WPI) pretreated by microbial transglutaminase (mTGase) and subsequent heating were studied in this work and were correlated to zeta-potential, surface hydrophobicity, thermal denaturation properties, and macroscopic turbidity and viscosity. Dispersions of 5% w/v WPI were pretreated by individual or sequential steps of preheating at 80 °C for 15 min and mTGase, used at 2.0-10.2 U/g WPI for 1-15 h, before adjustment of the pH to 7.0 and to 0-100 mM NaCl for heating at 80 °C for 15 and 90 min. The zeta potential and surface hydrophobicity of WPI increased after all pretreatment steps. Preheating increased cross-linking reactivity of WPI by mTGase, corresponding to significantly increased denaturation temperature. Particle size analysis and atomic force microscopy revealed that structures of sequentially pretreated WPI remained stable after heating at 100 mM NaCl, corresponding to transparent dispersions. Conversely, WPI pretreated by one step aggregated at only 100 mM NaCl and resulted in turbid dispersions. Besides reporting a practical approach to produce transparent beverages, nanoscale phenomena in the present study are important for understanding whey protein structures in relevant applications.
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Affiliation(s)
- Wan Wang
- Department of Food Science and Technology, The University of Tennessee, Knoxville, Tennessee 37996, USA
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50
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Hussain R, Gaiani C, Scher J. From high milk protein powders to the rehydrated dispersions in variable ionic environments: A review. J FOOD ENG 2012. [DOI: 10.1016/j.jfoodeng.2012.06.011] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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