1
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Tong Z, Zhang L, Liao W, Wang Y, Gao Y. Extraction, identification and application of gliadin from gluten: Impact of pH on physicochemical properties of unloaded- and lutein-loaded gliadin nanoparticles. Int J Biol Macromol 2023; 253:126638. [PMID: 37673163 DOI: 10.1016/j.ijbiomac.2023.126638] [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: 06/13/2023] [Revised: 08/24/2023] [Accepted: 08/29/2023] [Indexed: 09/08/2023]
Abstract
In the present study, high purity gliadin was extracted from gluten by the marginally modified Osborne method and the effect of different pHs in the aqueous ethanol on the physicochemical properties of unloaded gliadin nanoparticles (UGNs) and lutein-loaded gliadin nanoparticles (LGNs) was investigated. The results revealed that the formation of UGNs and LGNs at diverse pHs was driven by a conjunction of hydrogen bonding, electrostatic interactions and hydrophobic effects, but their dominant roles varied at different pHs. pH also significantly impacted the surface hydrophobicity, secondary structure and aromatic amino acid microenvironment of UGNs and LGNs. LGNs at pH 5.0 and at pH 9.0 exhibited better loading capacity and could reach 9.7884 ± 0.0006 % and 9.7360 ± 0.0017 %, respectively. These two samples also had greater photostability and thermal stability. Half-lives of LGNs at pH 5.0 were 2.185 h and 54.579 h, respectively. Half-lives of LGNs at pH 9.0 were 2.937 h and 49.159 h, respectively. LGNs at pH 5.0 and LGNs at pH 9.0 also had higher bioaccessibility of lutein, with 15.98 ± 0.04 % and 15.27 ± 0.03 %, respectively. These findings yielded precious inspirations for designing innovative lutein delivery system.
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Affiliation(s)
- Zhen Tong
- Key Laboratory of Healthy Beverages, China National light Industry Council, College of Food Science & Nutritional Engineering, China Agricultural University, Beijing 100083, PR China
| | - Liang Zhang
- Key Laboratory of Healthy Beverages, China National light Industry Council, College of Food Science & Nutritional Engineering, China Agricultural University, Beijing 100083, PR China
| | - Wenyan Liao
- Key Laboratory of Healthy Beverages, China National light Industry Council, College of Food Science & Nutritional Engineering, China Agricultural University, Beijing 100083, PR China
| | - Yuan Wang
- Key Laboratory of Healthy Beverages, China National light Industry Council, College of Food Science & Nutritional Engineering, China Agricultural University, Beijing 100083, PR China
| | - Yanxiang Gao
- Key Laboratory of Healthy Beverages, China National light Industry Council, College of Food Science & Nutritional Engineering, China Agricultural University, Beijing 100083, PR China.
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2
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Wu Y, Hu J, Du Y, Lu G, Li Y, Feng Y, Chen L, Tu Y, Xiang M, Gui Y, Shu T, Yu L. Mechanistic Insights into the Halophilic Xylosidase Xylo-1 and Its Role in Xylose Production. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71:15375-15387. [PMID: 37773011 DOI: 10.1021/acs.jafc.3c05045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/30/2023]
Abstract
The Xylo-1 xylosidase, which belongs to the GH43 family, exhibits a high salt tolerance. The present study demonstrated that the catalytic activity of Xylo-1 increased by 195% in the presence of 5 M NaCl. Additionally, the half-life of Xylo-1 increased 25.9-fold in the presence of 1 M NaCl. Through comprehensive analysis including circular dichroism, fluorescence spectroscopy, and molecular dynamics simulations, we elucidated that the presence of Na+ ions increased the contact frequency between the surface acidic amino acids and the surrounding water molecules. This resulted in the stabilization of the surrounding hydration layer of Xylo-1. Additionally, Na+ ions also stabilized the substrate-binding conformation and the fluctuation of water molecules within the active site, which enhanced the catalytic activity of Xylo-1 by increasing the nucleophilic attack by the water molecules. Ultimately, the optimal reaction conditions for the production of xylose by synergistic catalysis with Xylo-1 and xylanase were determined. The results demonstrated that the conversion yield of the method was high for various sources of xylan, indicating the method could have potential industrial applications. This study explored the structure-activity relationship of catalysis in Xylo-1 under high-salt conditions, provides novel insights into the mechanism of halophilic enzymes, and serves as a reference for the industrial application of Xylo-1.
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Affiliation(s)
- Ya Wu
- Institute of Resource Biology and Biotechnology, Department of Biotechnology, College of Life Science and Technology, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China
- Key Laboratory of Molecular Biophysics, Ministry of Education, 1037 Luoyu Road, Wuhan 430074, China
| | - Jiayue Hu
- Institute of Resource Biology and Biotechnology, Department of Biotechnology, College of Life Science and Technology, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China
| | - Yikai Du
- Institute of Resource Biology and Biotechnology, Department of Biotechnology, College of Life Science and Technology, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China
| | - Gen Lu
- Institute of Resource Biology and Biotechnology, Department of Biotechnology, College of Life Science and Technology, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China
- Key Laboratory of Molecular Biophysics, Ministry of Education, 1037 Luoyu Road, Wuhan 430074, China
| | - Yingnan Li
- Ministry of Education Key Laboratory of Industrial Biotechnology, School of Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Yujia Feng
- Institute of Resource Biology and Biotechnology, Department of Biotechnology, College of Life Science and Technology, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China
| | - Liting Chen
- Institute of Resource Biology and Biotechnology, Department of Biotechnology, College of Life Science and Technology, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China
| | - Yuhao Tu
- Institute of Resource Biology and Biotechnology, Department of Biotechnology, College of Life Science and Technology, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China
| | - Mengxiong Xiang
- Hubei Key Laboratory of Industrial Microbiology, Hubei University of Technology, 28 Nanli Road, Wuhan 430068, China
| | - Yifan Gui
- Institute of Resource Biology and Biotechnology, Department of Biotechnology, College of Life Science and Technology, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China
- Key Laboratory of Molecular Biophysics, Ministry of Education, 1037 Luoyu Road, Wuhan 430074, China
| | - Tong Shu
- Institute of Resource Biology and Biotechnology, Department of Biotechnology, College of Life Science and Technology, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China
- Key Laboratory of Molecular Biophysics, Ministry of Education, 1037 Luoyu Road, Wuhan 430074, China
| | - Longjiang Yu
- Institute of Resource Biology and Biotechnology, Department of Biotechnology, College of Life Science and Technology, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China
- Key Laboratory of Molecular Biophysics, Ministry of Education, 1037 Luoyu Road, Wuhan 430074, China
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3
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Chakraborty G. Red emitting fluorogenic dye as an efficient turn-on probe for milk allergen. Int J Biol Macromol 2022; 221:1527-1535. [PMID: 36122782 DOI: 10.1016/j.ijbiomac.2022.09.130] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Revised: 09/14/2022] [Accepted: 09/14/2022] [Indexed: 11/24/2022]
Abstract
Development of simple, fast and non-destructive technique such as fluorescence based method for the quantification of milk allergens in various dairy products is a highly rewarding task. In this contribution, a red emitting fluorogenic dye, quinaldine red (QR) is reported for the detection and quantification of a milk allergen, beta lactoglobulin (β-LG) in milk and whey matrices, utilizing its high selectivity and sensitivity towards β-LG. Detail spectroscopic investigation reveals that binding of QR to the hydrophobic calyx site of β-LG protein substantially reduces the torsional agility and propensity of TICT state formation of QR, rendering the dye highly fluorescent in nature. This enables estimation of β-LG with LOD 52.1(±0.9) nM in buffer solution and 0.21(±0.01) μM in 5 % bovine milk matrix respectively. Additionally, high selectivity and sensitivity, excellent repeatability, quick response, and emission in the biologically favorable red spectral region make QR based fluorometric quantification of β-LG a highly attractive choice. Finally, the estimated β-LG concentrations in milk and whey matrices from fluorometric titration and densitometry methods are found to match excellently with each other, suggesting potential of QR as an efficient turn-on fluorescent probe for the quantification of β-LG (milk allergen) in various dairy products.
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Affiliation(s)
- Goutam Chakraborty
- Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai 400085, India.
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4
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da Rocha L, Baptista AM, Campos SRR. Approach to Study pH-Dependent Protein Association Using Constant-pH Molecular Dynamics: Application to the Dimerization of β-Lactoglobulin. J Chem Theory Comput 2022; 18:1982-2001. [PMID: 35171602 PMCID: PMC9775224 DOI: 10.1021/acs.jctc.1c01187] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Protein-protein association is often mediated by electrostatic interactions and modulated by pH. However, experimental and computational studies have often overlooked the effect of association on the protonation state of the protein. In this work, we present a methodological approach based on constant-pH molecular dynamics (MD), which aims to provide a detailed description of a pH-dependent protein-protein association, and apply it to the dimerization of β-lactoglobulin (BLG). A selection of analyses is performed using the data generated by constant-pH MD simulations of monomeric and dimeric forms of bovine BLG, in the pH range 3-8. First, we estimate free energies of dimerization using a computationally inexpensive approach based on the Wyman-Tanford linkage theory, calculated in a new way through the use of thermodynamically based splines. The individual free energy contribution of each titratable site is also calculated, allowing for identification of relevant residues. Second, the correlations between the proton occupancies of pairs of sites are calculated (using the Pearson coefficient), and extensive networks of correlated sites are observed at acidic pH values, sometimes involving distant pairs. In general, strongly correlated sites are also slow proton exchangers and contribute significantly to the pH-dependency of the dimerization free energy. Third, we use ionic density as a fingerprint of protein charge distribution and observe electrostatic complementarity between the monomer faces that form the dimer interface, more markedly at the isoionic point (where maximum dimerization occurs) than at other pH values, which might contribute to guide the association. Finally, the pH-dependent dimerization modes are inspected using PCA, among other analyses, and two states are identified: a relaxed state at pH 4-8 (with the typical alignment of the crystallographic structure) and a compact state at pH 3-4 (with a tighter association and rotated alignment). This work shows that an approach based on constant-pH MD simulations can produce rich detailed pictures of pH-dependent protein associations, as illustrated for BLG dimerization.
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5
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Kieserling H, Pankow A, Keppler JK, Wagemans AM, Drusch S. Conformational state and charge determine the interfacial film formation and film stability of β-lactoglobulin. Food Hydrocoll 2021. [DOI: 10.1016/j.foodhyd.2020.106561] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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6
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Wu J, Chen H, Zhou L, Liu W, Zhong J, Liu C. An insight into heat-induced gelation of whey protein isolate–lactose mixed and conjugate solutions: rheological behavior, microstructure, and molecular forces. Eur Food Res Technol 2021. [DOI: 10.1007/s00217-021-03741-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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7
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Wang A, Lin J, Zhong Q. Enteric rice protein-shellac composite coating to enhance the viability of probiotic Lactobacillus salivarius NRRL B-30514. Food Hydrocoll 2021. [DOI: 10.1016/j.foodhyd.2020.106469] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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8
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Keppler JK, Heyse A, Scheidler E, Uttinger MJ, Fitzner L, Jandt U, Heyn TR, Lautenbach V, Loch JI, Lohr J, Kieserling H, Günther G, Kempf E, Grosch JH, Lewiński K, Jahn D, Lübbert C, Peukert W, Kulozik U, Drusch S, Krull R, Schwarz K, Biedendieck R. Towards recombinantly produced milk proteins: Physicochemical and emulsifying properties of engineered whey protein beta-lactoglobulin variants. Food Hydrocoll 2021. [DOI: 10.1016/j.foodhyd.2020.106132] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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9
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Heyn TR, Mayer J, Neumann HR, Selhuber-Unkel C, Kwade A, Schwarz K, Keppler JK. The threshold of amyloid aggregation of beta-lactoglobulin: Relevant factor combinations. J FOOD ENG 2020. [DOI: 10.1016/j.jfoodeng.2020.110005] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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10
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Zhu J, Li K, Wu H, Li W, Sun Q. Multi-spectroscopic, conformational, and computational atomic-level insights into the interaction of β-lactoglobulin with apigenin at different pH levels. Food Hydrocoll 2020. [DOI: 10.1016/j.foodhyd.2020.105810] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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11
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Chakraborty P, Bhattacharya B, Shivhare U, Basu S. Investigation of heat‐acid induced coagulation behaviour of whole milk systems employing front‐face fluorescence spectroscopy. INT J DAIRY TECHNOL 2020. [DOI: 10.1111/1471-0307.12726] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Purba Chakraborty
- Dr. SS Bhatnagar University Institute of Chemical Engineering and Technology Panjab University Chandigarh 160014 India
| | - Bhaswati Bhattacharya
- Department of Basic and Applied Sciences National Institute of Food Technology Entrepreneurship and Management Sonepat Haryana 131028 India
| | - Umashanker Shivhare
- Dr. SS Bhatnagar University Institute of Chemical Engineering and Technology Panjab University Chandigarh 160014 India
| | - Santanu Basu
- Department of Molecular Sciences Swedish University of Agricultural Sciences P.O. Box 7015 Uppsala SE‐750 07 Sweden
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12
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de Morais FP, Pessato TB, Rodrigues E, Peixoto Mallmann L, Mariutti LR, Netto FM. Whey protein and phenolic compound complexation: Effects on antioxidant capacity before and after in vitro digestion. Food Res Int 2020; 133:109104. [DOI: 10.1016/j.foodres.2020.109104] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Revised: 02/11/2020] [Accepted: 02/15/2020] [Indexed: 01/30/2023]
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13
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Abdollahi K, Ince C, Condict L, Hung A, Kasapis S. Combined spectroscopic and molecular docking study on the pH dependence of molecular interactions between β-lactoglobulin and ferulic acid. Food Hydrocoll 2020. [DOI: 10.1016/j.foodhyd.2019.105461] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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14
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Hundschell C, Bäther S, Drusch S, Wagemans A. Osmometric and viscometric study of levan, β-lactoglobulin and their mixtures. Food Hydrocoll 2020. [DOI: 10.1016/j.foodhyd.2019.105580] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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15
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Bonarek P, Loch JI, Tworzydło M, Cooper DR, Milto K, Wróbel P, Kurpiewska K, Lewiński K. Structure-based design approach to rational site-directed mutagenesis of β-lactoglobulin. J Struct Biol 2020; 210:107493. [PMID: 32169624 DOI: 10.1016/j.jsb.2020.107493] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 03/06/2020] [Accepted: 03/09/2020] [Indexed: 12/30/2022]
Abstract
Recombinant proteins play an important role in medicine and have diverse applications in industrial biotechnology. Lactoglobulin has shown great potential for use in targeted drug delivery and body fluid detoxification because of its ability to bind a variety of molecules. In order to modify the biophysical properties of β-lactoglobulin, a series of single-site mutations were designed using a structure-based approach. A 3-dimensional structure alignment of homologous molecules led to the design of nine β-lactoglobulin variants with mutations introduced in the binding pocket region. Seven stable and correctly folded variants (L39Y, I56F, L58F, V92F, V92Y, F105L, M107L) were thoroughly characterized by fluorescence, circular dichroism, isothermal titration calorimetry, size-exclusion chromatography, and X-ray structural investigations. The effects of the amino acid substitutions were observed as slight rearrangements of the binding pocket geometry, but they also significantly influenced the global properties of the protein. Most of the mutations increased the thermal/chemical stability without altering the dimerization constant or pH-dependent conformational behavior. The crystal structures reveal that the I56F and F105L mutations reduced the depth of the binding pocket, which is advantageous since it can reduce the affinity to endogenous fatty acids. The F105L mutant created a unique binding mode for a fatty acid, supporting the idea that lactoglobulin can be altered to bind unique molecules. Selected variants possessing a unique combination of their individual properties can be used for further, more advanced mutagenesis, and the presented results support further research using β-lactoglobulin as a therapeutic delivery agent or a blood detoxifying molecule.
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Affiliation(s)
- Piotr Bonarek
- Jagiellonian University, Faculty of Biochemistry, Biophysics and Biotechnology, Gronostajowa 7, 30-387 Kraków, Poland
| | - Joanna I Loch
- Jagiellonian University, Faculty of Chemistry, Gronostajowa 2, 30-387 Kraków, Poland
| | - Magdalena Tworzydło
- Jagiellonian University, Faculty of Biochemistry, Biophysics and Biotechnology, Gronostajowa 7, 30-387 Kraków, Poland
| | - David R Cooper
- University of Virginia, Department of Molecular Physiology and Biological Physics, 1340 Jefferson Park Avenue, Charlottesville, VA 22908, USA
| | - Katažyna Milto
- Jagiellonian University, Faculty of Biochemistry, Biophysics and Biotechnology, Gronostajowa 7, 30-387 Kraków, Poland
| | - Paulina Wróbel
- Jagiellonian University, Faculty of Chemistry, Gronostajowa 2, 30-387 Kraków, Poland
| | - Katarzyna Kurpiewska
- Jagiellonian University, Faculty of Chemistry, Gronostajowa 2, 30-387 Kraków, Poland
| | - Krzysztof Lewiński
- Jagiellonian University, Faculty of Chemistry, Gronostajowa 2, 30-387 Kraków, Poland.
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16
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Chen X, Zhang H, Hemar Y, Li N, Zhou P. Glycerol induced stability enhancement and conformational changes of β-lactoglobulin. Food Chem 2020; 308:125596. [DOI: 10.1016/j.foodchem.2019.125596] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2019] [Revised: 09/23/2019] [Accepted: 09/24/2019] [Indexed: 11/26/2022]
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17
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Bielec K, Bubak G, Kalwarczyk T, Holyst R. Analysis of Brightness of a Single Fluorophore for Quantitative Characterization of Biochemical Reactions. J Phys Chem B 2020; 124:1941-1948. [PMID: 32059107 PMCID: PMC7497653 DOI: 10.1021/acs.jpcb.0c00770] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
![]()
Intrinsic
molecular brightness (MB) is a number of emitted photons
per second per molecule. When a substrate labeled by a fluorophore
and a second unlabeled substrate form a complex in solution, the MB
of the fluorophore changes. Here we use this change to determine the equilibrium constant (K) for the formation of the complex at pM concentrations.
To illustrate this method, we used a reaction of DNA hybridization,
where only one of the strands was fluorescently labeled. We determined K at the substrate concentrations from 80 pM to 30 nM. We
validated this method against Förster resonance energy transfer
(FRET). This method is much simpler than FRET as it requires only
one fluorophore in the complex with a very small (a f̃ew percent)
change in MB.
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Affiliation(s)
- Krzysztof Bielec
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Grzegorz Bubak
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Tomasz Kalwarczyk
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Robert Holyst
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
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18
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Schestkowa H, Drusch S, Wagemans AM. FTIR analysis of β-lactoglobulin at the oil/water-interface. Food Chem 2020; 302:125349. [DOI: 10.1016/j.foodchem.2019.125349] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Revised: 08/01/2019] [Accepted: 08/08/2019] [Indexed: 11/29/2022]
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19
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Qie X, Chen Y, Quan W, Wang Z, Zeng M, Qin F, Chen J, He Z. Analysis of β-lactoglobulin–epigallocatechin gallate interactions: the antioxidant capacity and effects of polyphenols under different heating conditions in polyphenolic–protein interactions. Food Funct 2020; 11:3867-3878. [DOI: 10.1039/d0fo00627k] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
A β-Lg-EGCG covalent conjugate is formed by linking the amino group of a lysine residue and EGCG; the antioxidant capacity of EGCG induced by β-Lg–EGCG covalent conjugates causes a significant decrease.
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Affiliation(s)
- Xuejiao Qie
- State Key Laboratory of Food Science and Technology
- Jiangnan University
- Wuxi
- China
- International Joint Laboratory on Food Safety
| | - Yao Chen
- State Key Laboratory of Food Science and Technology
- Jiangnan University
- Wuxi
- China
- International Joint Laboratory on Food Safety
| | - Wei Quan
- State Key Laboratory of Food Science and Technology
- Jiangnan University
- Wuxi
- China
- International Joint Laboratory on Food Safety
| | - Zhaojun Wang
- State Key Laboratory of Food Science and Technology
- Jiangnan University
- Wuxi
- China
| | - Maomao Zeng
- State Key Laboratory of Food Science and Technology
- Jiangnan University
- Wuxi
- China
| | - Fang Qin
- State Key Laboratory of Food Science and Technology
- Jiangnan University
- Wuxi
- China
| | - Jie Chen
- State Key Laboratory of Food Science and Technology
- Jiangnan University
- Wuxi
- China
| | - Zhiyong He
- State Key Laboratory of Food Science and Technology
- Jiangnan University
- Wuxi
- China
- International Joint Laboratory on Food Safety
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20
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Gochev GG, Scoppola E, Campbell RA, Noskov BA, Miller R, Schneck E. β-Lactoglobulin Adsorption Layers at the Water/Air Surface: 3. Neutron Reflectometry Study on the Effect of pH. J Phys Chem B 2019; 123:10877-10889. [PMID: 31725291 DOI: 10.1021/acs.jpcb.9b07733] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Several characteristics of β-lactoglobulin (BLG) layers adsorbed at the air/water interface exhibit a strong pH dependence, but our knowledge on the underlying structure-property relations is still fragmental. Here, we therefore extend our recent studies by neutron reflectometry (NR) and provide a comprehensive overview through direct measurements of the surface excess Γ and the layers' molecular structure. This enables comparison with available literature data to draw general conclusions. The NR experiments were performed at various pH values and within a wide range of protein concentrations, CBLG. Adsorption kinetics measurements in air-contrast-matched-water and over a narrow Qz range enabled direct quantification of the dynamic surface excess Γ(t) and are found to be consistent with ellipsometry data. Near the isoelectric point, pI, the rates of adsorption and Γ are maximal but only at sufficiently high CBLG. NR data collected over a wider Qz range and in two aqueous isotopic contrasts revealed the structure of adsorbed BLG layers at a steady state close to equilibrium. Independent of the pH, BLG was found to form dense monolayers with average thicknesses of 1.1 nm, suggesting flattening of the BLG globules upon adsorption as compared with their bulk dimensions (≈3.5 nm). Near pI and at sufficiently high CBLG, a thick (≈5.5 nm) but looser secondary sublayer is additionally formed adjacent to the dense primary monolayer. The thickness of this sublayer can be interpreted in terms of disordered BLG dimers. The results obtained and notably the specific interfacial structuring of BLG near pI complement previous observations relating the impact of solution pH and CBLG on other interfacial characteristics such as surface pressure and surface dilational viscoelasticity modulus.
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Affiliation(s)
- Georgi G Gochev
- Max Planck Institute of Colloids and Interfaces , 14476 Potsdam , Germany.,Institute of Physical Chemistry , Bulgarian Academy of Sciences , 1113 Sofia , Bulgaria
| | - Ernesto Scoppola
- Max Planck Institute of Colloids and Interfaces , 14476 Potsdam , Germany
| | - Richard A Campbell
- Institut Laue-Langevin , 71 Avenue des Martyrs, CS20156 , 38042 Grenoble , France.,Division of Pharmacy and Optometry , University of Manchester , M13 9PT Manchester , U.K
| | - Boris A Noskov
- Institute of Chemistry , St. Petersburg State University , 198504 Saint-Petersburg , Russia
| | - Reinhard Miller
- Max Planck Institute of Colloids and Interfaces , 14476 Potsdam , Germany
| | - Emanuel Schneck
- Max Planck Institute of Colloids and Interfaces , 14476 Potsdam , Germany
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21
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Huang L, Xu Y, Zhou Y. Improvement of nutritional quality of soybean meal by Fe(II)-assisted acetic acid treatment. Food Chem 2019; 283:475-480. [PMID: 30722901 DOI: 10.1016/j.foodchem.2019.01.085] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Revised: 11/29/2018] [Accepted: 01/07/2019] [Indexed: 11/23/2022]
Abstract
We investigated the effect of Fe(II)-assisted acetic acid treatment on improvement of nutrition quality of soybean meal (SBM) by degrading antinutritional factors (ANFs) and maintaining initial nutrition quality. Fe(II)-assistance reduced trypsin inhibitor (TI) content significantly from 5.20 to 0.86 mg/g, and allergenic proteins were completely degraded at 55 °C, due to changes in the conformation of soybean protein isolate (SPI) that renders proteins more prone to acetic acid-mediated degradation. The red-shift of maximum emission wavelength indicated that Fe(II)-assisted acid induced molecular unfolding of SPI and increased surface hydrophobicity. Investigation of protein secondary structure revealed that Fe(II)-assisted acid treatment decreased the β-sheet structure by 4.65% and increased the α-helical content by 7.37%. This demonstrated that Fe(II) and acetic acid synergistically degrade ANFs by altering protein conformations in SBM.
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Affiliation(s)
- Lu Huang
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, People's Republic of China; College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, People's Republic of China; Jiangsu Province Key Laboratory of Green Biomass-based Fuels and Chemicals, Nanjing 210037, People's Republic of China
| | - Yong Xu
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, People's Republic of China; College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, People's Republic of China; Jiangsu Province Key Laboratory of Green Biomass-based Fuels and Chemicals, Nanjing 210037, People's Republic of China.
| | - Yanmin Zhou
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, People's Republic of China
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Allahdad Z, Varidi M, Zadmard R, Saboury AA, Haertlé T. Binding of β-carotene to whey proteins: Multi-spectroscopic techniques and docking studies. Food Chem 2019; 277:96-106. [DOI: 10.1016/j.foodchem.2018.10.057] [Citation(s) in RCA: 52] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Revised: 10/10/2018] [Accepted: 10/10/2018] [Indexed: 01/22/2023]
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Singh G, Singh G, Kancharla S, Kang TS. Complexation Behavior of β-Lactoglobulin with Surface Active Ionic Liquids in Aqueous Solutions: An Experimental and Computational Approach. J Phys Chem B 2019; 123:2169-2181. [DOI: 10.1021/acs.jpcb.8b11610] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Gagandeep Singh
- Department of Chemistry, UGC-Centre for Advance Studies—II, Guru Nanak Dev University, Amritsar 143005, India
| | - Gurbir Singh
- Department of Chemistry, UGC-Centre for Advance Studies—II, Guru Nanak Dev University, Amritsar 143005, India
| | - Srinivasarao Kancharla
- Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan
| | - Tejwant Singh Kang
- Department of Chemistry, UGC-Centre for Advance Studies—II, Guru Nanak Dev University, Amritsar 143005, India
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25
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Conformational state and charge determine the interfacial stabilization process of beta-lactoglobulin at preoccupied interfaces. J Colloid Interface Sci 2019; 536:300-309. [DOI: 10.1016/j.jcis.2018.10.043] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Revised: 10/16/2018] [Accepted: 10/17/2018] [Indexed: 01/19/2023]
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26
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Zhong L, Ma N, Wu Y, Zhao L, Ma G, Pei F, Hu Q. Characterization and functional evaluation of oat protein isolate-Pleurotus ostreatus β-glucan conjugates formed via Maillard reaction. Food Hydrocoll 2019. [DOI: 10.1016/j.foodhyd.2018.08.034] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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27
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Protection effect of sodium alginate against heat-induced structural changes of lactoferrin molecules at neutral pH. Lebensm Wiss Technol 2019. [DOI: 10.1016/j.lwt.2018.10.019] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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28
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Bonarek P, Polit A. Systematic calorimetric studies of proton exchange associated with binding of beta-lactoglobulin with ligand. Int J Biol Macromol 2018; 120:128-134. [DOI: 10.1016/j.ijbiomac.2018.08.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Revised: 08/03/2018] [Accepted: 08/04/2018] [Indexed: 01/05/2023]
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29
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Wei Y, Vriesekoop F, Yuan Q, Liang H. β-Lactoglobulin as a Nanotransporter for Glabridin: Exploring the Binding Properties and Bioactivity Influences. ACS OMEGA 2018; 3:12246-12252. [PMID: 31459299 PMCID: PMC6645583 DOI: 10.1021/acsomega.8b01576] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Accepted: 09/13/2018] [Indexed: 06/10/2023]
Abstract
Based on the fact that β-lactoglobulin (β-lg) can solubilize readily in water and bind many small hydrophobic molecules, a novel nanocomplexed glabridin with β-lg was developed by an antisolvent precipitation method. After binding to β-lg, the solubility of glabridin in aqueous solution was enhanced 21 times. Fluorescence spectroscopy of β-lg revealed that the interaction of glabridin with β-lg made the environment of Trp and Tyr residues on β-lg more hydrophilic. The morphology and crystal form of the nanocomplexed glabridin with β-lg was characterized and the changes in β-lg conformation was also been investigated. In combination with molecular docking modeling, the results revealed that glabridin was bound to β-lg by hydrophobic forces and hydrogen-bond interactions. Furthermore, the nanocomplexed glabridin with β-lg had a better 2,2-diphenyl-1-picrylhydrazyl radical-scavenging capacity and 2,2'-azino-bis-3-ethylbenzthiazoline-6-sulfonic acid radical-scavenging capacity compared to free glabridin at the same concentration during in vitro tests. Thus, nanocomplexing with β-lg, by virtue of its ability to enhance the solubility of glabridin in aqueous systems, provides a suitable opportunity as a nanocarrier molecule.
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Affiliation(s)
- Yongqin Wei
- State
Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing100029, P. R. China
| | - Frank Vriesekoop
- Department
of Food Science, Harper Adams University, Newport TF10 8NB, Shropshire, England
| | - Qipeng Yuan
- State
Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing100029, P. R. China
| | - Hao Liang
- State
Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing100029, P. R. China
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Sengupta B, Das N, Sen P. Monomerization and aggregation of β-lactoglobulin under adverse condition: A fluorescence correlation spectroscopic investigation. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2018; 1866:316-326. [DOI: 10.1016/j.bbapap.2017.11.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2017] [Revised: 11/01/2017] [Accepted: 11/12/2017] [Indexed: 12/26/2022]
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31
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Li Q, Zhao Z. Characterization of the Structural and Colloidal Properties of α-Lactalbumin/Chitosan Complexes as a Function of Heating. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:972-978. [PMID: 29301069 DOI: 10.1021/acs.jafc.7b04628] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
This research investigated the interaction between α-lactalbumin (α-la) and chitosan at different temperatures. Chitosan was added to α-la solution (5 g L-1) to achieve different α-la/chitosan ratios (8:1, 5:1, and 2:1), which were then subjected to different heating temperatures (20, 70, and 90 °C). The results indicated that a low amount of chitosan (8:1) precipitated α-la molecules. Increasing chitosan to a ratio of 5:1 resulted in exposure of the internal structure of α-la, and those formed complexes had high turbidity and average size, which were decreased by an increasing temperature. A further increase of chitosan to a ratio of 2:1 protected the internal structure of α-la molecules. All samples exhibited a similar adsorption behavior at the air/water interface, but the presence of chitosan significantly increased film elasticity. The produced complexes can be regarded as functional ingredients, which can be used as an emulsifying agent and a delivery material to control the release of bioactive compounds.
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Affiliation(s)
- Quanyang Li
- College of Light Industry and Food Engineering, Guangxi University , Nanning, Guangxi 530004, People's Republic of China
| | - Zhengtao Zhao
- College of Light Industry and Food Engineering, Guangxi University , Nanning, Guangxi 530004, People's Republic of China
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32
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Zhao Z, Li H, Zhao M, Li Q. Structural and surface properties of whey protein from buffalo milk as influenced by exopolysaccharide. INTERNATIONAL JOURNAL OF FOOD PROPERTIES 2018. [DOI: 10.1080/10942912.2017.1347673] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Zhengtao Zhao
- College of Light Industry and Food Engineering, Guangxi University, Nanning, P. R. China
| | - Hong Li
- College of Light Industry and Food Engineering, Guangxi University, Nanning, P. R. China
| | - Mouming Zhao
- Bright Dairy and Food Co. Ltd., Shanghai, State Key Laboratory of Dairy Biotechnology, Shanghai, P. R. China
| | - Quanyang Li
- College of Light Industry and Food Engineering, Guangxi University, Nanning, P. R. China
- Bright Dairy and Food Co. Ltd., Shanghai, State Key Laboratory of Dairy Biotechnology, Shanghai, P. R. China
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Estimating Extrinsic Dyes for Fluorometric Online Monitoring of Antibody Aggregation in CHO Fed-Batch Cultivations. Bioengineering (Basel) 2017; 4:bioengineering4030065. [PMID: 28952544 PMCID: PMC5615311 DOI: 10.3390/bioengineering4030065] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2017] [Revised: 07/15/2017] [Accepted: 07/17/2017] [Indexed: 12/13/2022] Open
Abstract
Multi-wavelength fluorescence spectroscopy was evaluated in this work as tool for real-time monitoring of antibody aggregation in CHO fed-batch cultivations via partial least square (PLS) modeling. Therefore, we used the extrinsic fluorescence dyes 1-anilinonaphthalene-8-sulfonate (ANS), 4,4′-bis-1-anilinonaphthalene-8-sulfonate (Bis-ANS), or Thioflavin T (ThT) as medium additives. This is a new application area, since these dyes are commonly used for aggregate detection during formulation development. We determined the half maximum inhibitory concentrations of ANS (203 ± 11 µmol·L−1), Bis-ANS (5 ± 0.5 µmol·L−1), and ThT (3 ± 0.2 µmol·L−1), and selected suitable concentrations for this application. The results showed that the emission signals of non-covalent dye antibody aggregate interaction superimposed the fluorescence signals originating from feed medium and cell culture. The fluorescence datasets were subsequently used to build PLS models, and the dye-related elevated fluorescence signals dominated the model calibration. The soft sensors based on ANS and Bis-ANS signals showed high predictability with a low error of prediction (1.7 and 2.3 mg·mL−1 aggregates). In general, the combination of extrinsic dye and used concentration influenced the predictability. Furthermore, the ThT soft sensor indicated that the intrinsic fluorescence of the culture might be sufficient to predict antibody aggregation online.
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Estévez N, Fuciños P, Bargiela V, Picó G, Valetti NW, Tovar CA, Rúa ML. Influence of pH on viscoelastic properties of heat-induced gels obtained with a β-Lactoglobulin fraction isolated from bovine milk whey hydrolysates. Food Chem 2017; 219:169-178. [DOI: 10.1016/j.foodchem.2016.09.137] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Revised: 09/15/2016] [Accepted: 09/21/2016] [Indexed: 11/29/2022]
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36
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Isolation of β-lactoglobulin from buffalo milk and characterization of its structure changes as a function of pH and ionic strength. JOURNAL OF FOOD MEASUREMENT AND CHARACTERIZATION 2017. [DOI: 10.1007/s11694-017-9468-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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37
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Aprodu I, Ursache FM, Turturică M, Râpeanu G, Stănciuc N. Thermal stability of the complex formed between carotenoids from sea buckthorn (Hippophae rhamnoides L.) and bovine β-lactoglobulin. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 173:562-571. [PMID: 27776310 DOI: 10.1016/j.saa.2016.10.010] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Revised: 09/28/2016] [Accepted: 10/15/2016] [Indexed: 06/06/2023]
Abstract
Sea buckthorn has gained importance as a versatile nutraceutical, due to its high nutritive value in terms of carotenoids content. β-Lactoglobulin (β-LG) is a natural carrier for various bioactive compounds. In this study, the effect of thermal treatment in the temperature range of 25 to 100°C for 15min on the complex formed by β-LG and carotenoids from sea buckthorn was reported, based on fluorescence spectroscopy, molecular docking and molecular dynamics simulation results. Also, the berries extracts were analyzed for their carotenoids content. The chromatographic profile of the sea buckthorn extracts revealed the presence of zeaxanthin and β-carotene, as major compounds. The Stern-Volmer constants and binding parameters between β-LG and β-carotene were estimated based on quenching experiments. When thermally treating the β-LG-carotenoids mixtures, an increase in intrinsic and extrinsic fluorescence intensity up to 90°C was observed, together with blue-shifts in maximum emission in the lower temperature range and red-shifts at higher temperature. Based on fluorescence spectroscopy results, the unfolding of the protein molecules at high temperature was suggested. Detailed information obtained at atomic level revealed that events taking place in the complex heated at high temperature caused important changes in the β-carotene binding site, therefore leading to a more thermodynamically stable assembly. This study can be used to understand the changes occurring at molecular level that could help food operators to design new ingredients and functional foods, and to optimize the processing methods in order to obtain healthier food products.
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Affiliation(s)
- Iuliana Aprodu
- Dunarea de Jos University of Galati, Faculty of Food Science and Engineering, Domneasca Street 111, 800201 Galati, Romania
| | - Florentina-Mihaela Ursache
- Dunarea de Jos University of Galati, Faculty of Food Science and Engineering, Domneasca Street 111, 800201 Galati, Romania
| | - Mihaela Turturică
- Dunarea de Jos University of Galati, Faculty of Food Science and Engineering, Domneasca Street 111, 800201 Galati, Romania
| | - Gabriela Râpeanu
- Dunarea de Jos University of Galati, Faculty of Food Science and Engineering, Domneasca Street 111, 800201 Galati, Romania
| | - Nicoleta Stănciuc
- Dunarea de Jos University of Galati, Faculty of Food Science and Engineering, Domneasca Street 111, 800201 Galati, Romania.
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38
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Visible light neutralizes the effect produced by ultraviolet radiation in proteins. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2017; 167:15-19. [DOI: 10.1016/j.jphotobiol.2016.11.023] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Revised: 11/15/2016] [Accepted: 11/17/2016] [Indexed: 12/24/2022]
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39
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Bøgh KL, Madsen CB. Food Allergens: Is There a Correlation between Stability to Digestion and Allergenicity? Crit Rev Food Sci Nutr 2017; 56:1545-67. [PMID: 25607526 DOI: 10.1080/10408398.2013.779569] [Citation(s) in RCA: 89] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Food allergy is a major health problem in the Western countries, affecting 3-8% of the population. It has not yet been established what makes a dietary protein a food allergen. Several characteristics have been proposed to be shared by food allergens. One of these is resistance to digestion. This paper reviews data from digestibility studies on purified food allergens and evaluates the predictive value of digestibility tests on the allergenic potential. We point out that food allergens do not necessarily resist digestion. We discuss how the choice of in vitro digestibility assay condition and the method used for detection of residual intact protein as well as fragments hereof may greatly influence the outcome as well as the interpretation of results. The finding that digests from food allergens may retain allergenicity, stresses the importance of using immunological assays for evaluating the allergenic potential of food allergen digestion products. Studies assessing the allergenicity of digestion products, by either IgE-binding, elicitation or sensitizing capacity, shows that digestion may abolish, decrease, have no effect, or even increase the allergenicity of food allergens. Therefore, the predictive value of the pepsin resistance test for assessing the allergenic potential of novel proteins can be questioned.
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Affiliation(s)
- Katrine Lindholm Bøgh
- a National Food Institute , Division for Diet, Disease Prevention and Toxicology, Technical University of Denmark , Søborg , Denmark
| | - Charlotte Bernhard Madsen
- a National Food Institute , Division for Diet, Disease Prevention and Toxicology, Technical University of Denmark , Søborg , Denmark
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40
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He Z, Tong C, Sheng L, Ma M, Cai Z. Monitoring glycation-induced structural and biofunctional changes in chicken immunoglobulin Y by different monosaccharides. Poult Sci 2016; 95:2715-2723. [DOI: 10.3382/ps/pew223] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/05/2016] [Indexed: 11/20/2022] Open
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41
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Lei Z, Chen XD, Mercadé-Prieto R. Effect of N-Ethylmaleimide as a Blocker of Disulfide Crosslinks Formation on the Alkali-Cold Gelation of Whey Proteins. PLoS One 2016; 11:e0164496. [PMID: 27732644 PMCID: PMC5061392 DOI: 10.1371/journal.pone.0164496] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Accepted: 09/26/2016] [Indexed: 11/18/2022] Open
Abstract
N-ethylmaleimide (NEM) was used to verify that no new disulfide crosslinks were formed during the fascinating rheology of the alkali cold-gelation of whey proteins, which show Sol-Gel-Sol transitions with time at pH > 11.5. These dynamic transitions involve the formation and subsequent destruction of non-covalent interactions between soluble whey aggregates. Therefore, incubation of aggregates with NEM was expected not to affect much the rheology. Experiments show that very little additions of NEM, such as 0.5 mol per mol of protein, delayed and significantly strengthened the metastable gels formed. Interactions between whey protein aggregates were surprisingly enhanced during incubation with NEM as inferred from oscillatory rheometry at different protein concentrations, dynamic swelling, Trp fluorescence and SDS-PAGE measurements.
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Affiliation(s)
- Zhao Lei
- Suzhou Key Laboratory of Green Chemical Engineering, School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou City, Jiangsu, 215123, P.R. China
| | - Xiao Dong Chen
- Suzhou Key Laboratory of Green Chemical Engineering, School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou City, Jiangsu, 215123, P.R. China
| | - Ruben Mercadé-Prieto
- Suzhou Key Laboratory of Green Chemical Engineering, School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou City, Jiangsu, 215123, P.R. China
- * E-mail:
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42
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Wilde SC, Treitz C, Keppler JK, Koudelka T, Palani K, Tholey A, Rawel HM, Schwarz K. β-Lactoglobulin as nanotransporter – Part II: Characterization of the covalent protein modification by allicin and diallyl disulfide. Food Chem 2016; 197:1022-9. [DOI: 10.1016/j.foodchem.2015.11.011] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Revised: 10/10/2015] [Accepted: 11/03/2015] [Indexed: 10/22/2022]
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43
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Dekkers BL, Kolodziejczyk E, Acquistapace S, Engmann J, Wooster TJ. Impact of gastric pH profiles on the proteolytic digestion of mixed βlg-Xanthan biopolymer gels. Food Funct 2016; 7:58-68. [DOI: 10.1039/c5fo01085c] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Gastric pH profile duringin vitrogastric digestion is critical for proper assessment of mixed biopolymer gel proteolysis.
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Affiliation(s)
| | | | | | - J. Engmann
- Nestec S.A
- Nestlé Research Centre
- CH 1000 Switzerland
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44
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Ersch C, Meijvogel LL, van der Linden E, Martin A, Venema P. Interactions in protein mixtures. Part I: Second virial coefficients from osmometry. Food Hydrocoll 2016. [DOI: 10.1016/j.foodhyd.2015.07.020] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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45
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Effect of temperature, calcium and protein concentration on aggregation of whey protein isolate: Formation of gel-like micro-particles. Int Dairy J 2015. [DOI: 10.1016/j.idairyj.2015.07.003] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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46
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The Folding process of Human Profilin-1, a novel protein associated with familial amyotrophic lateral sclerosis. Sci Rep 2015; 5:12332. [PMID: 26227615 PMCID: PMC4521207 DOI: 10.1038/srep12332] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Accepted: 06/17/2015] [Indexed: 12/11/2022] Open
Abstract
Human profilin-1 is a novel protein associated with a recently discovered form of familial amyotrophic lateral sclerosis. This urges the characterization of possible conformational states, different from the fully folded state, potentially able to initiate self-assembly. Under native conditions, profilin-1 is monomeric and possesses a well-defined secondary and tertiary structure. When incubated at low pH or with high urea concentrations, profilin-1 remains monomeric but populates unfolded states exhibiting larger hydrodynamic radius and disordered structure, as assessed by dynamic light scattering, far-UV circular dichroism and intrinsic fluorescence. Refolding from the urea-unfolded state was studied at equilibrium and in real-time using a stopped-flow apparatus. The results obtained with intrinsic fluorescence and circular dichroism indicate a single phase without significant changes of the corresponding signals before the major refolding transition. However, such a transition is preceded by a burst phase with an observed increase of ANS fluorescence, which indicates the conversion into a transiently populated collapsed state possessing solvent-exposed hydrophobic clusters. Kinetic analysis reveals that such state has a conformational stability comparable to that of the fully unfolded state. To our knowledge, profilin-1 is the first example of an amyloid-related protein where folding occurs in the absence of thermodynamically stable partially folded states.
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47
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Keppler JK, Martin D, Garamus VM, Schwarz K. Differences in binding behavior of (−)-epigallocatechin gallate to β-lactoglobulin heterodimers (AB) compared to homodimers (A) and (B). J Mol Recognit 2015; 28:656-66. [DOI: 10.1002/jmr.2480] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2014] [Revised: 04/27/2015] [Accepted: 04/28/2015] [Indexed: 01/10/2023]
Affiliation(s)
- Julia K. Keppler
- Christian-Albrechts-University of Kiel; Institute of Human Nutrition and Food Science, Division of Food Technology; Kiel Germany
| | - Dierk Martin
- Max Rubner-Institut (MRI); Department of Safety and Quality of Milk and Fish Products; Kiel Germany
| | - Vasil M. Garamus
- Helmholtz-Zentrum Geesthacht; Zentrum für Material- und Küstenforschung GmbH; Geesthacht Germany
| | - Karin Schwarz
- Christian-Albrechts-University of Kiel; Institute of Human Nutrition and Food Science, Division of Food Technology; Kiel Germany
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48
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Interaction of β-lactoglobulin with (−)-epigallocatechin-3-gallate under different processing conditions of pH and temperature by the fluorescence quenching method. Eur Food Res Technol 2015. [DOI: 10.1007/s00217-015-2466-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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49
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Loch JI, Bonarek P, Polit A, Świątek S, Czub M, Ludwikowska M, Lewiński K. Conformational variability of goat β-lactoglobulin: Crystallographic and thermodynamic studies. Int J Biol Macromol 2015; 72:1283-91. [DOI: 10.1016/j.ijbiomac.2014.10.031] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2014] [Revised: 10/14/2014] [Accepted: 10/15/2014] [Indexed: 10/24/2022]
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Chen B, Zhang H, Xi W, Zhao L, Liang L, Chen Y. Unfolding mechanism of lysozyme in various urea solutions: Insights from fluorescence spectroscopy. J Mol Struct 2014. [DOI: 10.1016/j.molstruc.2014.08.023] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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