1
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Wang J, Lu T, Li Y, Wang J, Spruijt E. Aqueous coordination polymer complexes: From colloidal assemblies to bulk materials. Adv Colloid Interface Sci 2023; 318:102964. [PMID: 37515864 DOI: 10.1016/j.cis.2023.102964] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 06/19/2023] [Accepted: 07/14/2023] [Indexed: 07/31/2023]
Abstract
1-dimensional (1D) coordination polymers refer to the macromolecules that have metal ions incorporated in their pendent groups or main chain through metal-binding ligand groups. They have intrinsic advantages over traditional polymers to regulate the polymer structures and functions owing to the nature of the metal-ligand bond. Consequently, they have great potential for the development of smart and functional structures and materials and therapeutic agents. Water-soluble 1D coordination polymers and assemblies are an important subtype of coordination polymers with distinctive interests for demanding applications in aqueous systems, such as biological and medical applications. This review highlights the recent progress and research achievements in the design and use of water-soluble 1D coordination polymers and assemblies. The overview covers the design and structure control of 1D coordination polymers, their colloidal assemblies, including nanoparticles, nanofibers, micelles and vesicles, and fabricated bulk materials such as membraneless liquid condensates, security ink, hydrogel actuators, and smart fabrics. Finally, we discuss the potential applications of several of these coordination polymeric structures and materials and give an outlook on the field of aqueous coordination polymers.
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Affiliation(s)
- Jiahua Wang
- Department of Radiology, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai 200233, China; Radboud University, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, the Netherlands
| | - Tiemei Lu
- Radboud University, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, the Netherlands
| | - Yuehua Li
- Department of Radiology, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai 200233, China
| | - Junyou Wang
- State Key Laboratory of Chemical Engineering and Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China.
| | - Evan Spruijt
- Radboud University, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, the Netherlands.
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2
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Bayrak M, Mata J, Conn C, Floury J, Logan A. Application of small angle scattering (SAS) in structural characterisation of casein and casein-based products during digestion. Food Res Int 2023; 169:112810. [PMID: 37254386 DOI: 10.1016/j.foodres.2023.112810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 03/01/2023] [Accepted: 04/11/2023] [Indexed: 06/01/2023]
Abstract
In recent years, small and ultra-small angle scattering techniques, collectively known as small angle scattering (SAS) have been used to study various food structures during the digestion process. These techniques play an important role in structural characterisation due to the non-destructive nature (especially when using neutrons), various in situ capabilities and a large length scale (of 1 nm to ∼20 μm) they cover. The application of these techniques in the structural characterisation of dairy products has expanded significantly in recent years. Casein, a major dairy protein, forms the basis of a wide range of gel structures at different length scales. These gel structures have been extensively researched utilising scattering techniques to obtain structural information at the nano and micron scale that complements electron and confocal microscopy. Especially, neutrons have provided opportunity to study these gels in their natural environment by using various in situ options. One such example is understanding changes in casein gel structures during digestion in the gastrointestinal tract, which is essential for designing personalised food structures for a wide range of food-related diseases and improve health outcomes. In this review, we present an overview of casein gels investigated using small angle and ultra-small angle scattering techniques. We also reviewed their digestion using newly built setups recently employed in various research. To gain a greater understanding of micro and nano-scale structural changes during digestion, such as the effect of digestive juices and mechanical breakdown on structure, new setups for semi-solid food materials are needed to be optimised.
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Affiliation(s)
- Meltem Bayrak
- CSIRO Agriculture and Food, 671 Sneydes Road, Werribee, Victoria 3030, Australia; School of Science, College of Science, Engineering and Health, RMIT University, 124 La Trobe Street, Melbourne, VIC 3000, Australia.
| | - Jitendra Mata
- Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia.
| | - Charlotte Conn
- School of Science, College of Science, Engineering and Health, RMIT University, 124 La Trobe Street, Melbourne, VIC 3000, Australia.
| | | | - Amy Logan
- CSIRO Agriculture and Food, 671 Sneydes Road, Werribee, Victoria 3030, Australia.
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Li S, Qiang S, Wang J, Yang T, Jiang L, Zhang Y, Chen Y. Structure, stability, and mechanism of dextran-CPP-Ca 2+ conjugates: A novel high-efficiency calcium ion delivery system. Food Chem 2023; 408:135190. [PMID: 36535187 DOI: 10.1016/j.foodchem.2022.135190] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 12/05/2022] [Accepted: 12/07/2022] [Indexed: 12/14/2022]
Abstract
Calcium has limited bioavailability because of the formation of calcium phosphate deposits in the gastrointestinal tract. In this study, we prepared a dextran-casein phosphopeptide (CPP)-Ca2+ delivery system and evaluated for Ca2+ binding mechanism, structure, stability, and sustained release of Ca2+ and assessed inhibition of calcium phosphate precipitation. The results revealed that Ca2+ binds to dextran-CPP through the phosphate, carboxyl, and amino groups and forms crystal clusters. Furthermore, compared with single polymer CPP-Ca2+ conjugates, copolymer dextran-CPP-Ca2+ conjugates exhibited improved stability at various conditions (pH, temperature, and coexisting food), efficiently reduced the calcium phosphate precipitation, and improved sustained-release of Ca2+. Collectively, dextran-CPP-Ca2+ conjugates can be an efficient Ca2+ delivery system.
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Affiliation(s)
- Shuhong Li
- Tianjin Key Laboratory of Food Quality and Health, Tianjin University of Science and Technology, Tianjin 300457, PR China
| | - Siqi Qiang
- Tianjin Key Laboratory of Food Quality and Health, Tianjin University of Science and Technology, Tianjin 300457, PR China
| | - Jiake Wang
- Tianjin Key Laboratory of Food Quality and Health, Tianjin University of Science and Technology, Tianjin 300457, PR China
| | - Tongliang Yang
- Tianjin Key Laboratory of Food Quality and Health, Tianjin University of Science and Technology, Tianjin 300457, PR China
| | - Lan Jiang
- Tianjin Key Laboratory of Food Quality and Health, Tianjin University of Science and Technology, Tianjin 300457, PR China
| | - Yifu Zhang
- Tianjin Key Laboratory of Food Quality and Health, Tianjin University of Science and Technology, Tianjin 300457, PR China
| | - Ye Chen
- Tianjin Key Laboratory of Food Quality and Health, Tianjin University of Science and Technology, Tianjin 300457, PR China.
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4
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Impact of sodium orthophosphate, sodium pyrophosphate or sodium citrate addition via dry-salting on the properties of low-moisture part skim mozzarella. Int Dairy J 2023. [DOI: 10.1016/j.idairyj.2022.105527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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5
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Temperature effects on calcium partition kinetics in pasteurised skim milk during storage. Int Dairy J 2023. [DOI: 10.1016/j.idairyj.2022.105518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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6
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Loria KG, Pilosof AM, Farías ME. Self-association of caseinomacropeptide in presence of CaCl2 at neutral pH: Calcium binding determination. Lebensm Wiss Technol 2022. [DOI: 10.1016/j.lwt.2022.113419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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7
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Csire G, Dupire F, Canabady-Rochelle L, Selmeczi K, Stefan L. Bio-Inspired Casein-Derived Antioxidant Peptides Exhibiting a Dual Direct/Indirect Mode of Action. Inorg Chem 2022; 61:1941-1948. [PMID: 35034436 DOI: 10.1021/acs.inorgchem.1c03085] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Antioxidant compounds are chemicals of primary importance, especially for their applications in nutrition and healthcare, thanks to their abilities to prevent oxidation processes and to limit and/or rebalance the oxidative stress, well-known for its impact on a wide variety of diseases. While several biomolecules are well-known for their antioxidant properties (e.g., ascorbic acid, carotenoids, phenolic derivatives), bio-sourced antioxidants have drawn considerable attention in the last decades, especially bioactive peptides, mainly obtained by the hydrolysis process. Antioxidant peptide sequences are mainly identified a posteriori, thanks to fastidious and time-consuming approaches and techniques, limiting the discovery of new efficient peptides. In this context and taking inspiration from nature, we report herein on a new series of three bio-inspired antioxidant peptides derived from the milk protein casein. These phosphopeptides, designed to chelate the redox-active iron(III) and forming highly soluble complexes up to pH 9, act both as indirect (i.e., inhibition of the metal redox activity) and direct (i.e., radical scavenging) antioxidants.
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Affiliation(s)
- Gizella Csire
- Université de Lorraine, CNRS, LCPM, F-54000 Nancy, France.,Université de Lorraine, CNRS, L2CM, F-54000 Nancy, France
| | | | | | | | - Loic Stefan
- Université de Lorraine, CNRS, LCPM, F-54000 Nancy, France
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Effects of polysaccharide charge density on the structure and stability of carboxymethylcellulose-casein nanocomplexes at pH 4.5 prepared with and without a pH-cycle. Food Hydrocoll 2021. [DOI: 10.1016/j.foodhyd.2021.106718] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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9
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Thybo CD, Lillevang SK, Skibsted LH, Ahrné L. Calcium balance during direct acidification of milk for Mozzarella cheese production. Lebensm Wiss Technol 2020. [DOI: 10.1016/j.lwt.2020.109677] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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10
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Luo M, Xiao J, Sun S, Cui F, Liu G, Li W, Li Y, Cao Y. Deciphering calcium-binding behaviors of casein phosphopeptides by experimental approaches and molecular simulation. Food Funct 2020; 11:5284-5292. [PMID: 32458848 DOI: 10.1039/d0fo00844c] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Casein phosphopeptides (CPPs) as premium additives in functional foods can facilitate the transport and adsorption of calcium. The atomic resolution decipherment of calcium-CPP binding behaviors is critical for understanding the calcium bioavailability enhancement potential of CPPs. In the present study, the experimental methods (UV-vis, FTIR and isothermal titration calorimetry) and molecular dynamics simulation were combined to reveal the calcium-binding behaviors of β-casein phosphopeptides (1-25) (P5) with the best capability in carrying calcium ions. We found that it could carry approximately six calcium ions, and the calcium-binding sites were primarily located at the carbonyl group of Glu-2 and the phosphate group of phosphorylated Ser-15, Ser-18, and Ser-19. An interesting finding was that calcium ions could be bound by three coordinated modes, including unidentate, bidentate and tridentate geometries, resulting in the strong binding abilities. The binding process of calcium ions to P5 was spontaneous with the binding free energies of -5.2 kcal mol-1. Hydrophobic interactions were considered to be the major driving force for the calcium ion binding. The present study provides novel molecular insights into the binding process between Ca2+ and calcium-binding peptides.
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Affiliation(s)
- Minna Luo
- Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, Engineering Research Center for Natural Actives, College of Food Science, South China Agricultural University, Guangzhou 510642, China. and Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, Guangdong, China
| | - Jie Xiao
- Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, Engineering Research Center for Natural Actives, College of Food Science, South China Agricultural University, Guangzhou 510642, China. and Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, Guangdong, China
| | - Shengwei Sun
- Key Laboratory of Food Processing and Quality Control, College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
| | - Fengchao Cui
- Key Laboratory of High-Performance Synthetic Rubber and its Composite Materials, Changchun institute of Applied Chemistry, Chinese Academy of Sciences Changchun, Chinese Academy of Sciences, Changchun 130022, China
| | - Guo Liu
- Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, Engineering Research Center for Natural Actives, College of Food Science, South China Agricultural University, Guangzhou 510642, China.
| | - Wei Li
- Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, Engineering Research Center for Natural Actives, College of Food Science, South China Agricultural University, Guangzhou 510642, China.
| | - Yunqi Li
- Key Laboratory of High-Performance Synthetic Rubber and its Composite Materials, Changchun institute of Applied Chemistry, Chinese Academy of Sciences Changchun, Chinese Academy of Sciences, Changchun 130022, China
| | - Yong Cao
- Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, Engineering Research Center for Natural Actives, College of Food Science, South China Agricultural University, Guangzhou 510642, China. and Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, Guangdong, China
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11
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Wurm F, Rietzler B, Pham T, Bechtold T. Multivalent Ions as Reactive Crosslinkers for Biopolymers-A Review. Molecules 2020; 25:E1840. [PMID: 32316293 PMCID: PMC7221734 DOI: 10.3390/molecules25081840] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 04/08/2020] [Accepted: 04/14/2020] [Indexed: 12/20/2022] Open
Abstract
Many biopolymers exhibit a strong complexing ability for multivalent ions. Often such ions form ionic bridges between the polymer chains. This leads to the formation of ionic cross linked networks and supermolecular structures, thus promoting the modification of the behavior of solid and gel polymer networks. Sorption of biopolymers on fiber surfaces and interfaces increases substantially in the case of multivalent ions, e.g., calcium being available for ionic crosslinking. Through controlled adsorption and ionic crosslinking surface modification of textile fibers with biopolymers can be achieved, thus altering the characteristics at the interface between fiber and surrounding matrices. A brief introduction on the differences deriving from the biopolymers, as their interaction with other compounds, is given. Functional models are presented and specified by several examples from previous and recent studies. The relevance of ionic crosslinks in biopolymers is discussed by means of selected examples of wider use.
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Affiliation(s)
- Florian Wurm
- Research Institute of Textile Chemistry and Textile Physics, University of Innsbruck, Rundfunkplatz 4, 6850 Dornbirn, Vorarlberg, Austria; (T.P.); (T.B.)
| | - Barbara Rietzler
- KTH Royal Institute of Technology, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre and Polymer Technology/WWSC, Teknikringen 56, SE-10044 Stockholm, Sweden;
| | - Tung Pham
- Research Institute of Textile Chemistry and Textile Physics, University of Innsbruck, Rundfunkplatz 4, 6850 Dornbirn, Vorarlberg, Austria; (T.P.); (T.B.)
| | - Thomas Bechtold
- Research Institute of Textile Chemistry and Textile Physics, University of Innsbruck, Rundfunkplatz 4, 6850 Dornbirn, Vorarlberg, Austria; (T.P.); (T.B.)
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12
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Loosli F, Yi Z, Wang J, Baalousha M. Improved extraction efficiency of natural nanomaterials in soils to facilitate their characterization using a multimethod approach. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 677:34-46. [PMID: 31051381 DOI: 10.1016/j.scitotenv.2019.04.301] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2019] [Revised: 04/19/2019] [Accepted: 04/20/2019] [Indexed: 06/09/2023]
Abstract
Characterization of natural nanomaterial (NNM) physicochemical properties - such as size, size distribution, elemental composition and elemental ratios - is often hindered by lack of methods to disperse NNMs from environmental samples. This study evaluates the effect of extractant composition, pH, and ionic strength on soil NNM extraction in term of recovery and release of primary particles/small aggregate sizes (i.e., <200 nm). The extracted NNMs were characterized for hydrodynamic diameter and zeta potential by dynamic light scattering and laser Doppler electrophoresis, natural organic matter desorption by UV-Vis spectroscopy, element composition by inductively coupled plasma-mass spectroscopy (ICP-MS), size based elemental distribution by field flow fractionation coupled to ICP-MS, and morphology by transmission electron microscopy. The extracted NNM concentrations increased following the order of NaOH ≤ Na2CO3 < Na2C2O4 < Na4P2O7. Na4P2O7 was the most efficient extractant and results in 2-12 folds higher NNM extraction than other extractants. The Na4P2O7 extracted NNMs exhibited narrower size distribution with smaller modal size relative to NaOH, Na2CO3, Na2C2O4 extracted NNMs. Thus, Na4P2O7 enhances the extraction of primary NNMs and/or smaller NNM aggregates (i.e., size <200 nm). Na4P2O7 promote soil microaggregates breakup and release of NNMs by reducing free multivalent cation concentration in soil pore water by forming metal-phosphate complexes and by enhancing NNM surface charge via phosphate sorption on NNM surfaces. Additionally, the extracted NNM concentrations increased with the increase in extractant concentration and pH, except at 100 mM where the high ionic strength might have induced NNM aggregation. The improved NNM-extraction will improve the overall understanding of the physicochemical properties of NNMs in environmental systems. This study presents the key properties of NNMs that can be used as background information to differentiate engineered nanomaterials (ENMs) from NNMs in complex environmental media.
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Affiliation(s)
- Frédéric Loosli
- Center for Environmental Nanoscience and Risk, Department of Environmental Health Sciences, Arnold School of Public Health, University of South Carolina, SC 29208, USA; Centre for Microbiology and Environmental Systems Science, University of Vienna, 1090 Vienna, Austria.
| | - Zebang Yi
- Center for Environmental Nanoscience and Risk, Department of Environmental Health Sciences, Arnold School of Public Health, University of South Carolina, SC 29208, USA; College of Earth Science, Guilin University of Technology, Guilin 541004, China
| | - Jingjing Wang
- Center for Environmental Nanoscience and Risk, Department of Environmental Health Sciences, Arnold School of Public Health, University of South Carolina, SC 29208, USA
| | - Mohammed Baalousha
- Center for Environmental Nanoscience and Risk, Department of Environmental Health Sciences, Arnold School of Public Health, University of South Carolina, SC 29208, USA.
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13
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Kern L, Fabre O, Scher J, Petit J. Chemical fractionation of caseins by differential precipitation: influence of pH, calcium addition, protein concentration and temperature on the depletion in α‐ and β‐caseins. Int J Food Sci Technol 2019. [DOI: 10.1111/ijfs.14283] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Loïc Kern
- LIBio (Laboratoire d'Ingénierie des Biomolécules) Université de Lorraine F‐54000 Nancy France
| | - Olivier Fabre
- Agria Grand Est 2 rue du Doyen Marcel Roubault, Bâtiment Géologie54505 Vandoeuvre‐lès‐Nancy France
| | - Joël Scher
- LIBio (Laboratoire d'Ingénierie des Biomolécules) Université de Lorraine F‐54000 Nancy France
| | - Jeremy Petit
- LIBio (Laboratoire d'Ingénierie des Biomolécules) Université de Lorraine F‐54000 Nancy France
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14
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Greenfield TJ, Julve M, Doyle RP. Exploring the biological, catalytic, and magnetic properties of transition metal coordination complexes incorporating pyrophosphate. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2018.12.011] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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15
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Hebishy E, Joubran Y, Murphy E, O'Mahony JA. Influence of calcium-binding salts on heat stability and fouling of whey protein isolate dispersions. Int Dairy J 2019. [DOI: 10.1016/j.idairyj.2018.12.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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16
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Recio RT, Guerra NP, Torrado A, Skibsted LH. Interaction between calcium and casein hydrolysates: Stoichiometry, binding constant, binding sites and thermal stability of casein phosphopeptide complexes. Int Dairy J 2019. [DOI: 10.1016/j.idairyj.2018.08.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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17
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A quantitative model of the bovine casein micelle: ion equilibria and calcium phosphate sequestration by individual caseins in bovine milk. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2018; 48:45-59. [PMID: 30128695 DOI: 10.1007/s00249-018-1330-2] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Revised: 08/02/2018] [Accepted: 08/13/2018] [Indexed: 10/28/2022]
Abstract
The white appearance of skim milk is due to strong light scattering by colloidal particles called casein micelles. Bovine casein micelles comprise expressed proteins from four casein genes together with significant fractions of the total calcium, inorganic phosphate, magnesium and citrate ions in the milk. Thus, the milk salts are partitioned between the casein micelles, where they are mostly in the form of nanoclusters of an amorphous calcium phosphate sequestered by caseins through their phosphorylated residues, with the remainder in the continuous phase. Previously, a salt partition calculation was made assuming that the nanoclusters are sequestered only by short, highly phosphorylated casein sequences, sometimes called phosphate centres. Three of the four caseins have a proportion of their phosphorylated residues in either one or two phosphate centres and these were proposed to react with the nanoclusters equally and independently. An improved model of the partition of caseins and salts in milk is described in which all the phosphorylated residues in competent caseins act together to bind to and sequester the nanoclusters. The new model has been applied to results from a recent study of variation in salt and casein composition in the milk of individual cows. Compared to the previous model, it provides better agreement with experiment of the partition of caseins between free and bound states and equally good results for the partition of milk salts. In addition, new calculations are presented for the charge on individual caseins in their bound and free states.
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18
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Hindmarsh JP, Watkinson P. Experimental evidence for previously unclassified calcium phosphate structures in the casein micelle. J Dairy Sci 2017; 100:6938-6948. [PMID: 28690066 DOI: 10.3168/jds.2017-12623] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Accepted: 05/17/2017] [Indexed: 11/19/2022]
Abstract
1H-31P Cross-polarization magic angle spinning (CP-MAS) measurements of 40-d-old Mozzarella cheese and 20 mM EDTA-treated casein micelles revealed that each sample had immobile phosphorus with the same spectral pattern, which did not match that of native casein micelles. To identify the immobile phosphorus bodies, 1H-31P CP-MAS spectra and cross-polarization kinetics measurements were undertaken on native casein micelles, EDTA-chelated casein micelles, and reference samples of β-casein and hydroxyapatite. The results showed that the immobile phosphorus bodies in the mature Mozzarella cheese had the following characteristics: they are immobile phosphoserine residues (not colloidal calcium phosphate); they are not the product of phosphoserine to colloidal calcium phosphate bridging; the phosphate is complexed to calcium; their rigidity is localized to a phosphorus site; their rigidity and bond coupling is unaffected by protein hydration; and the immobile bodies share a narrow range of bond orientations. Combining these observations, the best explanation of the immobile phosphorus bodies is that bonding structures of phosphorus-containing groups and calcium exist within the casein micelle that are not yet clearly classified in the literature. The best candidate is a calcium-bridged phosphoserine-to-phosphoserine linkage, either intra- or inter-protein.
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Affiliation(s)
- J P Hindmarsh
- Massey Institute of Food Science and Technology, Massey University, Riddet Road, Palmerston North, New Zealand 4474.
| | - P Watkinson
- Fonterra Research and Development Centre (FRDC), Fitzherbert Dairy Farm Road, Palmerston North, New Zealand 4442
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Kezia K, Lee J, Zisu B, Chen GQ, Gras SL, Kentish SE. Solubility of Calcium Phosphate in Concentrated Dairy Effluent Brines. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2017; 65:4027-4034. [PMID: 28457125 DOI: 10.1021/acs.jafc.6b05792] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The solubility of calcium phosphate in concentrated dairy brine streams is important in understanding mineral scaling on equipment, such as membrane modules, evaporators, and heat exchangers, and in brine pond operation. In this study, the solubility of calcium phosphate has been assessed in the presence of up to 300 g/L sodium chloride as well as lactose, organic acids, and anions at 10, 30, and 50 °C. As a neutral molecule, lactose has a marginal but still detectable effect upon calcium solubility. However, additions of sodium chloride up to 100 g/L result in a much greater increase in calcium solubility. Beyond this point, the concentrations of ions in the solution decrease significantly. These changes in calcium solubility can readily be explained through changes in the activity coefficients. There is little difference in calcium phosphate speciation between 10 and 30 °C. However, at 50 °C, the ratio of calcium to phosphate in the solution is lower than at the other temperatures and varies less with ionic strength. While the addition of sodium lactate has less effect upon calcium solubility than sodium citrate, it still has a greater effect than sodium chloride at an equivalent ionic strength. Conversely, when these organic anions are present in the solution in the acid form, the effect of pH dominates and results in much higher solubility and a calcium/phosphate ratio close to one, indicative of dicalcium phosphate dihydrate as the dominant solid phase.
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Affiliation(s)
| | - J Lee
- Department of Chemical and Process Engineering, University of Surrey Guildford , Surrey GU27XH, United Kingdom
| | - B Zisu
- School of Applied Science, College of Science, Engineering and Health, RMIT University Melbourne , Melbourne, Victoria 3000, Australia
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21
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Zinc bioavailability from whey. Enthalpy-entropy compensation in protein binding. Food Res Int 2016; 89:749-755. [DOI: 10.1016/j.foodres.2016.10.002] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2016] [Revised: 09/29/2016] [Accepted: 10/02/2016] [Indexed: 01/05/2023]
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22
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Lu Y, Hu F, Miyakawa T, Tanokura M. Complex Mixture Analysis of Organic Compounds in Yogurt by NMR Spectroscopy. Metabolites 2016; 6:metabo6020019. [PMID: 27322339 PMCID: PMC4931550 DOI: 10.3390/metabo6020019] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Revised: 06/08/2016] [Accepted: 06/13/2016] [Indexed: 11/16/2022] Open
Abstract
NMR measurements do not require separation and chemical modification of samples and therefore rapidly and directly provide non-targeted information on chemical components in complex mixtures. In this study, one-dimensional (¹H, (13)C, and (31)P) and two-dimensional (¹H-(13)C and ¹H-(31)P) NMR spectroscopy were conducted to analyze yogurt without any pretreatment. ¹H, (13)C, and (31)P NMR signals were assigned to 10 types of compounds. The signals of α/β-lactose and α/β-galactose were separately observed in the ¹H NMR spectra. In addition, the signals from the acyl chains of milk fats were also successfully identified but overlapped with many other signals. Quantitative difference spectra were obtained by subtracting the diffusion ordered spectroscopy (DOSY) spectra from the quantitative ¹H NMR spectra. This method allowed us to eliminate interference on the overlaps; therefore, the correct intensities of signals overlapped with those from the acyl chains of milk fat could be determined directly without separation. Moreover, the ¹H-(31)P HMBC spectra revealed for the first time that N-acetyl-d-glucosamine-1-phosphate is contained in yogurt.
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Affiliation(s)
- Yi Lu
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan.
| | - Fangyu Hu
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan.
| | - Takuya Miyakawa
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan.
| | - Masaru Tanokura
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan.
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23
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Vavrusova M, Skibsted LH. Aqueous solubility of calcium citrate and interconversion between the tetrahydrate and the hexahydrate as a balance between endothermic dissolution and exothermic complex formation. Int Dairy J 2016. [DOI: 10.1016/j.idairyj.2016.02.033] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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24
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Johansson S, Diehl B, Christakopoulos P, Austin S, Vafiadi C. Oligosaccharide Synthesis in Fruit Juice Concentrates Using a Glucansucrase From Lactobacillus reuteri 180. FOOD AND BIOPRODUCTS PROCESSING 2016. [DOI: 10.1016/j.fbp.2016.01.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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25
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Al Omari MMH, Rashid IS, Qinna NA, Jaber AM, Badwan AA. Calcium Carbonate. PROFILES OF DRUG SUBSTANCES, EXCIPIENTS, AND RELATED METHODOLOGY 2016; 41:31-132. [PMID: 26940168 DOI: 10.1016/bs.podrm.2015.11.003] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Calcium carbonate is a chemical compound with the formula CaCO3 formed by three main elements: carbon, oxygen, and calcium. It is a common substance found in rocks in all parts of the world (most notably as limestone), and is the main component of shells of marine organisms, snails, coal balls, pearls, and eggshells. CaCO3 exists in different polymorphs, each with specific stability that depends on a diversity of variables.
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Affiliation(s)
- M M H Al Omari
- The Jordanian Pharmaceutical Manufacturing Co., Amman, Jordan
| | - I S Rashid
- The Jordanian Pharmaceutical Manufacturing Co., Amman, Jordan
| | | | - A M Jaber
- Philadelphia University, Amman, Jordan
| | - A A Badwan
- The Jordanian Pharmaceutical Manufacturing Co., Amman, Jordan
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26
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Arranz E, Corredig M, Guri A. Designing food delivery systems: challenges related to the in vitro methods employed to determine the fate of bioactives in the gut. Food Funct 2016; 7:3319-36. [DOI: 10.1039/c6fo00230g] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
This review discussesin vitroavailable approaches to study delivery and uptake of bioactive compounds and the associated challenges.
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Affiliation(s)
- Elena Arranz
- Food Science Department
- University of Guelph
- Guelph
- Canada
| | | | - Anilda Guri
- Food Science Department
- University of Guelph
- Guelph
- Canada
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27
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Johns PW, Dimler SR, Watson JJ, Tigner M, Caskey PF. Determination of Soluble Calcium and Phosphorus in Commercial Milled Hydroxyapatite. FOOD ANAL METHOD 2015. [DOI: 10.1007/s12161-015-0363-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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28
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Schwartz JM, Solé V, Guéguen J, Ropers MH, Riaublanc A, Anton M. Partial replacement of β-casein by napin, a rapeseed protein, as ingredient for processed foods: Thermoreversible aggregation. Lebensm Wiss Technol 2015. [DOI: 10.1016/j.lwt.2015.03.084] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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29
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Baigts Allende D, de Jongh HHJ. Calcium Binding Restores Gel Formation of Succinylated Gelatin and Reduces Brittleness with Preservation of the Elastically Stored Energy. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2015; 63:7058-7065. [PMID: 26154824 DOI: 10.1021/acs.jafc.5b01962] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
To better tailor gelatins for textural characteristics in (food) gels, their interactions are destabilized by introduction of electrostatic repulsions and creation of affinity sites for calcium to "lock" intermolecular interactions. For that purpose gelatins with various degrees of succinylation are obtained. Extensive succinylation hampers helix formation and gel strength is slightly reduced. At high degrees of succinylation the helix propensity, gelling/melting temperatures, concomitant transition enthalpy, and gel strength become calcium-sensitive, and relatively low calcium concentrations largely restore these properties. Although succinylation has a major impact on the brittleness of the gels formed and the addition of calcium makes the material less brittle compared to nonmodified gelatin, the modification has no impact on the energy balance in the gel, where all energy applied is elastically stored in the material. This is explained by the unaffected stress relaxation by the network and high water-holding capacity related to the small mesh sizes in the gels.
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Affiliation(s)
| | - Harmen H J de Jongh
- †TI Food and Nutrition, P.O. Box 557, 6700 AN Wageningen, The Netherlands
- §ProtIn Consultancy, Rozenstraat 19E, 3702 VL Zeist, The Netherlands
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30
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Romero MJRH, Nakashima S, Nikaido T, Ichinose S, Sadr A, Tagami J. Inhibition of hydroxyapatite growth by casein, a potential salivary phosphoprotein homologue. Eur J Oral Sci 2015; 123:288-96. [PMID: 26083784 DOI: 10.1111/eos.12196] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/29/2015] [Indexed: 11/30/2022]
Abstract
Salivary phosphoproteins are essential in tooth mineral regulation but are often overlooked in vitro. This study aimed to evaluate the effect of casein, as a salivary phosphoprotein homologue, on the deposition and growth of hydroxyapatite (HA) on tooth surfaces. Hydroxyapatite growth was quantified using seeded crystal systems. Artificial saliva (AS) containing HA powder and 0, 10, 20, 50, or 100 μg ml(-1) of casein, or 100 μg ml(-1) of dephosphorylated casein (Dcasein), was incubated for 0-8 h at 37°C, pH 7.2. Calcium concentrations were measured using atomic absorption spectroscopy (AAS). Surface precipitation of HA on bovine enamel and dentine blocks, incubated in similar conditions for 7 d, was examined using field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) with selected area electron diffraction (SAED). Casein adsorption was assessed using modified Lowry assays and zeta-potential measurements. The AAS results revealed a concentration-dependent inhibition of calcium consumption. Hydroxyapatite precipitation occurred when no casein was present, whereas precipitation of HA was apparently completely inhibited in casein-containing groups. Adsorption data demonstrated increasingly negative zeta-potential with increased casein concentration and an affinity constant similar to proline-rich proteins with Langmuir modelling. Casein inhibited the deposition and growth of HA primarily through the binding of esterized phosphate to HA active sites, indicating its potential as a mineral-regulating salivary phosphoprotein homologue in vitro.
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Affiliation(s)
- Maria J R H Romero
- Department of Cariology and Operative Dentistry, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Syozi Nakashima
- Department of Cariology and Operative Dentistry, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Toru Nikaido
- Department of Cariology and Operative Dentistry, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Shizuko Ichinose
- Instrumental Analysis Research Center, Tokyo Medical and Dental University, Tokyo, Japan
| | - Alireza Sadr
- International Exchange Center, Tokyo Medical and Dental University, Tokyo, Japan.,Department of Restorative Dentistry, University of Washington School of Dentistry, Seattle, WA, USA
| | - Junji Tagami
- Department of Cariology and Operative Dentistry, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
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Rahimi N, Doroodmand MM, Ghahremani A. Fabrication of a novel casein phosphopeptides/multi-walled carbon nanotubes/micro hybrid resin as mixed matrix membrane-junction reference electrode. J Electroanal Chem (Lausanne) 2015. [DOI: 10.1016/j.jelechem.2015.02.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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32
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Tsikritzi R, Wang J, Collins VJ, Allen VJ, Mavrommatis Y, Moynihan PJ, Gosney MA, Kennedy OB, Methven L. The Effect of Nutrient Fortification of Sauces on Product Stability, Sensory Properties, and Subsequent Liking by Older Adults. J Food Sci 2015; 80:S1100-10. [DOI: 10.1111/1750-3841.12850] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2014] [Accepted: 02/22/2015] [Indexed: 11/29/2022]
Affiliation(s)
- Roussa Tsikritzi
- Dept. of Food and Nutritional Sciences; Univ. of Reading; Whiteknights Reading RG6 6AP U.K
| | - Jianqiu Wang
- Dept. of Food and Nutritional Sciences; Univ. of Reading; Whiteknights Reading RG6 6AP U.K
| | - Vanessa J. Collins
- Dept. of Food and Nutritional Sciences; Univ. of Reading; Whiteknights Reading RG6 6AP U.K
| | - Victoria J. Allen
- Clinical Health Sciences; Univ. of Reading; London Rd. Reading Berkshire RG1 5AQ U.K
| | - Yiannis Mavrommatis
- School of Sport, Health and Applied Science; St Mary's Univ. College; Waldegrave Rd. Twickenham London TW1 4SX U.K
| | - Paula J. Moynihan
- Inst. for Ageing and Health; Newcastle Univ; Framlington Place Newcastle upon Tyne NE2 4BW U.K
| | - Margot A. Gosney
- Clinical Health Sciences; Univ. of Reading; London Rd. Reading Berkshire RG1 5AQ U.K
| | - Orla B. Kennedy
- Dept. of Food and Nutritional Sciences; Univ. of Reading; Whiteknights Reading RG6 6AP U.K
| | - Lisa Methven
- Dept. of Food and Nutritional Sciences; Univ. of Reading; Whiteknights Reading RG6 6AP U.K
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33
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Padovano JD, Ravindran S, Snee PT, Ramachandran A, Bedran-Russo AK, George A. DMP1-derived peptides promote remineralization of human dentin. J Dent Res 2015; 94:608-14. [PMID: 25694469 DOI: 10.1177/0022034515572441] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Remineralization of dentin during dental caries is of considerable clinical interest. Dentin matrix protein 1 (DMP1) is a non-collagenous calcium-binding protein that plays a critical role in biomineralization. In the present study, we tested if peptides derived from DMP1 can be used for dentin remineralization. Peptide pA (pA, MW = 1.726 kDa) and peptide pB (pB, MW = 2.185), containing common collagen-binding domains and unique calcium-binding domains, were synthesized by solid-phase chemistry. An extreme caries lesion scenario was created by collagenase digestion, and the biomineral-nucleating potential of these peptides was ascertained when coated on collagenase-treated dentin matrix and control, native human dentin matrix under physiological levels of calcium and phosphate. Scanning electron microscopy analysis suggests that peptide pB was an effective nucleator when compared with pA. However, a 1:4 ratio of pA to pB was determined to be ideal for dentin remineralization, based on hydroxyapatite (HA) morphology and calcium/phosphorus ratios. Interestingly, HA was nucleated on collagenase-challenged dentin with as little as 20 min of 1:4 peptide incubation. Electron diffraction confirmed the presence of large HA crystals that produced a diffraction pattern indicative of a rod-like crystal structure. These findings suggest that DMP1-derived peptides may be useful to modulate mineral deposition and subsequent formation of HA when exposed to physiological concentrations of calcium and phosphate.
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Affiliation(s)
- J D Padovano
- Brodie Tooth Development Genetics & Regenerative Medicine Research Laboratory, Department of Oral Biology, University of Illinois at Chicago, Chicago, IL, USA
| | - S Ravindran
- Brodie Tooth Development Genetics & Regenerative Medicine Research Laboratory, Department of Oral Biology, University of Illinois at Chicago, Chicago, IL, USA
| | - P T Snee
- Department of Chemistry, College of Liberal Arts and Sciences, University of Illinois at Chicago, Chicago, IL, USA
| | - A Ramachandran
- Brodie Tooth Development Genetics & Regenerative Medicine Research Laboratory, Department of Oral Biology, University of Illinois at Chicago, Chicago, IL, USA
| | - A K Bedran-Russo
- Department of Restorative Dentistry, College of Dentistry, University of Illinois at Chicago, Chicago, IL, USA
| | - A George
- Brodie Tooth Development Genetics & Regenerative Medicine Research Laboratory, Department of Oral Biology, University of Illinois at Chicago, Chicago, IL, USA
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34
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Wintgens V, Dalmas F, Sébille B, Amiel C. Novel phosphorus-containing cyclodextrin polymers and their affinity for calcium cations and hydroxyapatite. Carbohydr Polym 2013; 98:896-904. [DOI: 10.1016/j.carbpol.2013.06.073] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2013] [Revised: 06/27/2013] [Accepted: 06/28/2013] [Indexed: 12/20/2022]
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35
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Holt C, Carver JA, Ecroyd H, Thorn DC. Invited review: Caseins and the casein micelle: their biological functions, structures, and behavior in foods. J Dairy Sci 2013; 96:6127-46. [PMID: 23958008 DOI: 10.3168/jds.2013-6831] [Citation(s) in RCA: 282] [Impact Index Per Article: 25.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2013] [Accepted: 06/09/2013] [Indexed: 12/27/2022]
Abstract
A typical casein micelle contains thousands of casein molecules, most of which form thermodynamically stable complexes with nanoclusters of amorphous calcium phosphate. Like many other unfolded proteins, caseins have an actual or potential tendency to assemble into toxic amyloid fibrils, particularly at the high concentrations found in milk. Fibrils do not form in milk because an alternative aggregation pathway is followed that results in formation of the casein micelle. As a result of forming micelles, nutritious milk can be secreted and stored without causing either pathological calcification or amyloidosis of the mother's mammary tissue. The ability to sequester nanoclusters of amorphous calcium phosphate in a stable complex is not unique to caseins. It has been demonstrated using a number of noncasein secreted phosphoproteins and may be of general physiological importance in preventing calcification of other biofluids and soft tissues. Thus, competent noncasein phosphoproteins have similar patterns of phosphorylation and the same type of flexible, unfolded conformation as caseins. The ability to suppress amyloid fibril formation by forming an alternative amorphous aggregate is also not unique to caseins and underlies the action of molecular chaperones such as the small heat-shock proteins. The open structure of the protein matrix of casein micelles is fragile and easily perturbed by changes in its environment. Perturbations can cause the polypeptide chains to segregate into regions of greater and lesser density. As a result, the reliable determination of the native structure of casein micelles continues to be extremely challenging. The biological functions of caseins, such as their chaperone activity, are determined by their composition and flexible conformation and by how the casein polypeptide chains interact with each other. These same properties determine how caseins behave in the manufacture of many dairy products and how they can be used as functional ingredients in other foods.
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Affiliation(s)
- C Holt
- Institute of Molecular, Cell and Systems Biology, School of Life Sciences, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
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36
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Vavrusova M, Skibsted LH. Calcium binding to dipeptides of aspartate and glutamate in comparison with orthophosphoserine. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2013; 61:5380-4. [PMID: 23682986 DOI: 10.1021/jf400741e] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Aspartate binds calcium(II) better than glutamate with Ka = 7.0 ± 0.9 L mol⁻¹ for Asp and Ka = 3.0 ± 0.8 L mol⁻¹ for Glu, respectively, as determined using calcium-selective electrodes for aqueous solutions of ionic strength 0.20 at 25 °C at pH of relevance for milk products. For the mixed peptides, the affinity seems additive with Ka = 27 ± 3 L mol⁻¹ for Asp-Glu and 22.7 ± 0.1 for Glu-Asp as compared to the expected 21 L mol⁻¹. In contrast, for Asp-Asp, the affinity is less than additive with Ka = 23 ± 5 L mol⁻¹ as compared to the expected 49 L mol⁻¹, whereas for Glu-Glu, the affinity is more than additive with Ka = 26 ± 4 L mol⁻¹ as compared to the expected 9.0 L mol⁻¹, indicating specific structural effects for Glu-Glu. Ionic strength effects, 1.0 versus 0.20 studied, are similar for Asp and Glu with decreasing affinity for higher ionic strength, whereas the dipeptides with Glu as C-terminus are more sensitive to increasing ionic strength than with Asp as C-terminus. Despite little affinity of calcium to serine with Ka = 0.9 ± 0.2 L mol⁻¹, Glu has increasing affinity for calcium in the serine dipeptide Ser-Glu with Ka = 10 ± 3 L mol⁻¹, which becomes comparable to phosphorylated serine with Ka = 22 ± 5 L mol⁻¹.
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Affiliation(s)
- Martina Vavrusova
- Food Chemistry, Department of Food Science, University of Copenhagen , Rolighedsvej 30, DK-1958 Frederiksberg C, Denmark
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37
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38
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Studies of polyphosphate composition and their interaction with dairy matrices by ion chromatography and 31P NMR spectroscopy. Int Dairy J 2013. [DOI: 10.1016/j.idairyj.2012.09.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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39
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Heat treatment effect on polyphosphate chain length in aqueous and calcium solutions. Food Chem 2012; 134:712-6. [DOI: 10.1016/j.foodchem.2012.02.164] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2011] [Revised: 01/10/2012] [Accepted: 02/20/2012] [Indexed: 11/16/2022]
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40
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Nongonierma AB, Fitzgerald RJ. Biofunctional properties of caseinophosphopeptides in the oral cavity. Caries Res 2012; 46:234-67. [PMID: 22572605 DOI: 10.1159/000338381] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2011] [Accepted: 03/14/2012] [Indexed: 11/19/2022] Open
Abstract
Caseinophosphopeptides (CPPs), bioactive peptides released from caseins, have the ability to enhance bivalent mineral solubility. This is relevant to numerous biological functions in the oral cavity (promotion of tooth enamel remineralisation, prevention of demineralisation and buffering of plaque pH). Therefore, CPPs may play a positive role as prophylactic agents for caries, enamel erosion and regression of white spot lesions. Most in vitro and in situ studies demonstrate strong evidence for the bioactivity of CPPs in the oral cavity. Nevertheless, relatively little is known concerning their use as adjuvants for oral health and more particularly regarding their long-term effects on oral health.
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Affiliation(s)
- A B Nongonierma
- Department of Life Sciences and Food for Health Ireland (FHI), University of Limerick, Limerick, Ireland
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41
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Zidane F, Matéos A, Cakir-Kiefer C, Miclo L, Rahuel-Clermont S, Girardet JM, Corbier C. Binding of divalent metal ions to 1–25 β-caseinophosphopeptide: An isothermal titration calorimetry study. Food Chem 2012; 132:391-8. [DOI: 10.1016/j.foodchem.2011.11.006] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2011] [Revised: 09/20/2011] [Accepted: 11/01/2011] [Indexed: 11/15/2022]
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