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Li M, Zhou D, Li Y, Li Q, Song Y, Geng F, Wu D. Aggregation studies of alpha-lactalbumin induced by edible azo dyes with different sulfonyl group numbers: A comparative study. Int J Biol Macromol 2023; 253:127374. [PMID: 37839609 DOI: 10.1016/j.ijbiomac.2023.127374] [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: 04/19/2023] [Revised: 09/14/2023] [Accepted: 10/09/2023] [Indexed: 10/17/2023]
Abstract
As an opaque and complex colloidal mixture, milk is usually present as a positively charged colloid under acidic conditions. Adding negatively charged colloids can lead to protein aggregation in milk. Alpha-lactalbumin (α-La) is an essential component of whey protein and has good physicochemical properties for functional food development. We combined spectroscopy, computer simulations, and other techniques to comparative analyze the mechanisms and characteristics of isolated α-La aggregation induced by CI Acid Red 27 (C27)/CI Acid Red 14 (FB) containing different sulfonyl groups in vitro. The results showed that C27/FB (5.25 × 10-5 mol·L-1 to 3.15 × 10-4 mol·L-1) induced the formation of fibril-like aggregates under acidic conditions (pH 2.0 and 4.0) mainly benefit from hydrophobic and electrostatic forces. Weakening and redshift of α-La's characteristics negative peak were observed (208 nm to 218 nm) on circular dichroism. β-Crosslinks self-assembly and reorganization of disulfide bonds occurred during protein fibrillation. Moreover, the different redshift intensity of Congo red binding to amyloid fibrils was observed to be induced by C27 (>551 nm) and FB (>536 nm), and the direct observation by TEM demonstrated the ability to induce protein fibrillation is C27 > FB. Edible azo dyes with more sulfonyl groups would possess a stronger ability to induce protein fibrillation.
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Affiliation(s)
- Mohan Li
- Meat Processing Key Laboratory of Sichuan Province, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, China
| | - Dian Zhou
- Meat Processing Key Laboratory of Sichuan Province, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, China
| | - Yuanqiao Li
- Meat Processing Key Laboratory of Sichuan Province, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, China
| | - Qinhong Li
- Meat Processing Key Laboratory of Sichuan Province, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, China
| | - Yali Song
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu 610100, China.
| | - Fang Geng
- Meat Processing Key Laboratory of Sichuan Province, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, China
| | - Di Wu
- Meat Processing Key Laboratory of Sichuan Province, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, China.
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Equy E, Hirtzel J, Hellé S, Heurtault B, Mathieu E, Rabineau M, Ball V, Ploux L. Fluorescent bioinspired albumin/polydopamine nanoparticles and their interactions with Escherichia coli cells. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2023; 14:1208-1224. [PMID: 38169939 PMCID: PMC10760463 DOI: 10.3762/bjnano.14.100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Accepted: 11/29/2023] [Indexed: 01/05/2024]
Abstract
Inspired by the eumelanin aggregates in human skin, polydopamine nanoparticles (PDA NPs) are promising nanovectors for biomedical applications, especially because of their biocompatibility. We synthesized and characterized fluorescent PDA NPs of 10-25 nm diameter based on a protein containing a lysine-glutamate diad (bovine serum albumin, BSA) and determined whether they can penetrate and accumulate in bacterial cells to serve as a marker or drug nanocarrier. Three fluorescent PDA NPs were designed to allow for tracking in three different wavelength ranges by oxidizing BSA/PDA NPs (Ox-BSA/PDA NPs) or labelling with fluorescein 5-isothiocyanate (FITC-BSA/PDA NPs) or rhodamine B isothiocyanate (RhBITC-BSA/PDA NPs). FITC-BSA/PDA NPs and RhBITC-BSA/PDA NPs penetrated and accumulated in both cell wall and inner compartments of Escherichia coli (E. coli) cells. The fluorescence signals were diffuse or displayed aggregate-like patterns with both labelled NPs and free dyes. RhBITC-BSA/PDA NPs led to the most intense fluorescence in cells. Penetration and accumulation of NPs was not accompanied by a bactericidal or inhibitory effect of growth as demonstrated with the Gram-negative E. coli species and confirmed with a Gram-positive bacterial species (Staphylococcus aureus). Altogether, these results allow us to envisage the use of labelled BSA/PDA NPs to track bacteria and carry drugs in the core of bacterial cells.
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Affiliation(s)
- Eloïse Equy
- UMR_S1121, INSERM/University of Strasbourg, 1 rue Eugène Boeckel, 67084 Strasbourg, France
- Faculty of Dentistry, University of Strasbourg, 8 Rue Ste Elisabeth, 67000 Strasbourg, France
| | - Jordana Hirtzel
- Faculty of Dentistry, University of Strasbourg, 8 Rue Ste Elisabeth, 67000 Strasbourg, France
- UMR 7199, CNRS/University of Strasbourg, 74 route du Rhin, 67401 Illkirch, France
| | - Sophie Hellé
- UMR_S1121, INSERM/University of Strasbourg, 1 rue Eugène Boeckel, 67084 Strasbourg, France
- Faculty of Dentistry, University of Strasbourg, 8 Rue Ste Elisabeth, 67000 Strasbourg, France
| | - Béatrice Heurtault
- UMR 7199, CNRS/University of Strasbourg, 74 route du Rhin, 67401 Illkirch, France
| | - Eric Mathieu
- UMR_S1121, INSERM/University of Strasbourg, 1 rue Eugène Boeckel, 67084 Strasbourg, France
- Faculty of Dentistry, University of Strasbourg, 8 Rue Ste Elisabeth, 67000 Strasbourg, France
| | - Morgane Rabineau
- UMR_S1121, INSERM/University of Strasbourg, 1 rue Eugène Boeckel, 67084 Strasbourg, France
- Faculty of Dentistry, University of Strasbourg, 8 Rue Ste Elisabeth, 67000 Strasbourg, France
| | - Vincent Ball
- UMR_S1121, INSERM/University of Strasbourg, 1 rue Eugène Boeckel, 67084 Strasbourg, France
- Faculty of Dentistry, University of Strasbourg, 8 Rue Ste Elisabeth, 67000 Strasbourg, France
| | - Lydie Ploux
- UMR_S1121, INSERM/University of Strasbourg, 1 rue Eugène Boeckel, 67084 Strasbourg, France
- Faculty of Dentistry, University of Strasbourg, 8 Rue Ste Elisabeth, 67000 Strasbourg, France
- CNRS, 23 rue du Loess, 67200 Strasbourg, France
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Behrendt V, Blättermann A, Brandenburg A. A fiber-optical fluorescence sensor for in-line determination of cleanliness during cip processes. FOOD AND BIOPRODUCTS PROCESSING 2023. [DOI: 10.1016/j.fbp.2022.10.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Maiti P, Saren U, Chakraborty U, Singha T, Paul S, Paul PK. Comparative and Selective Interaction of Amino Acid d-Cysteine with Colloidal Gold Nanoparticles in the Presence of a Fluorescent Probe in Aqueous Medium. ACS OMEGA 2022; 7:29013-29026. [PMID: 36033694 PMCID: PMC9404198 DOI: 10.1021/acsomega.2c02725] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Accepted: 08/01/2022] [Indexed: 05/20/2023]
Abstract
In this communication, we report the comparative and selective interaction of amino acid d-cysteine (d-Cys) with citrate caped gold nanoparticles (Au NPs) in the presence of a fluorescent dye, rhodamine B (RhB), in aqueous solution. Au NPs of size 27.5 nm could almost fully quench the steady-state fluorescence emission of RhB at their optimum concentrations in the mixed solution. The interactions of d-Cys, l-Cys, all other relevant d- and l-amino acids, neurotransmitters, and other relevant biological compounds with the Au NPs/RhB mixed solution have been explored by monitoring the fluorescence recovery efficiencies from the almost fully quenched state of RhB fluorescence via a simple steady-state spectrofluorometric method. The higher fluorescence recovery for the interaction of d-Cys with the Au NPs/RhB mixed system is accompanied by a distinct color change (red-wine to bluish-black) of the assay medium after the reaction compared to that of all other interfering compounds considered in this work. The sensitivity of this fluorometric response lies in a broad linear range of concentrations of d-Cys and the limit of detection (LOD) is found to be 4.2 nM, which is low compared to many other methods available in the literature. The different degrees of interaction of d-Cys and l-Cys with the Au NPs/RhB mixed sample have been further explored by circular dichroism (CD) spectroscopy and Fourier transform infrared (FTIR) spectroscopy. The selective interaction of d-Cys with the proposed Au NPs/RhB mixed system is also found to be correlated with interparticle cross-linking and aggregations of nanoparticles by the analysis of ζ potential and dynamic light scattering (DLS) study, transmission electron microscopy (TEM), atomic force microscopy (AFM), UV-vis absorption spectroscopy etc. The proposed interaction mechanism is further studied with a normal human urine sample to elucidate that the optimized combination of Au NPs and RhB may be realized as an efficient platform for detection of the amino acid d-Cys in a real biosample via a simple fluorometric approach.
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Affiliation(s)
- Pradip Maiti
- Department
of Physics, Jadavpur University, Jadavpur, Kolkata 700032, India
| | - Ujjal Saren
- Department
of Physics, Jadavpur University, Jadavpur, Kolkata 700032, India
| | - Utsav Chakraborty
- Department
of Physics, Jadavpur University, Jadavpur, Kolkata 700032, India
| | - Tanmoy Singha
- Department
of Physics, Jadavpur University, Jadavpur, Kolkata 700032, India
| | - Sharmistha Paul
- West
Bengal State Council of Science and Technology, Department of Science and Technology and Biotechnology, Vigyan Chetana Bhavan, Sector-I, Salt Lake, Kolkata 700064, India
| | - Pabitra Kumar Paul
- Department
of Physics, Jadavpur University, Jadavpur, Kolkata 700032, India
- , . Phone: +91-9477631142 (M), +91-33-24138917 (O). Fax:
+91-33-24138917 (O)
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TLR2-mediated mucosal immune priming boosts anti-rhabdoviral immunity in early vertebrates. Antiviral Res 2022; 203:105346. [DOI: 10.1016/j.antiviral.2022.105346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Revised: 04/19/2022] [Accepted: 05/17/2022] [Indexed: 11/19/2022]
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