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Chitosan-Based Nanocomposites for Glyphosate Detection Using Surface Plasmon Resonance Sensor

Publication year: 2020
Authors: M.Huy Do 1,2, B.Dubreil 1, J.Peydecastaing 1, G.Vaca-Medina 1,3, T.-T.Nhu-Trang 4, N.Jaffrezic-Renault 5, P.Behra 1,2
Published in: Sensors 2020, Vol. 20(20), 5942
This article describes an optical method based on the association of surface plasmon resonance (SPR) with chitosan (CS) film and its nanocomposites, including zinc oxide (ZnO) or graphene oxide (GO) [...]

Structures and Antifouling Properties of Self-Assembled Zwitterionic Peptide Monolayers: Effects of Peptide Charge Distributions and Divalent Cations

Publication year: 2020
Authors: Chuanxi Li 1,2,3, Chunjiang Liu 1, Minglun Li 2, Xin Xu 2, Shuzhou Li 2, Wei Qi 1,3, Rongxin Su 1,3, Jing Yu 2
Published in: Biomacromolecules, 2020, Vol. 21 (6), p. 2087–2095
Zwitterionic peptides are great candidates as antifouling coating materials in many biomedical applications. We investigated the structure and antifouling properties f surface-tethered zwitterionic peptide monolayers [...]

Label-free characterization and real-time monitoring of cell uptake of extracellular vesicles

Publication year: 2020
Authors: Koponen A.ab, Kerkelä E. a, Rojalin T. b, Lázaro-Ibáñez E. b, Suutari T. b, Saari H.b, Siljander P.c, Yliperttula M. b, Laitinen S. a, Viitala T. b
Published in: Biosensors and Bioelectronics, 2020, Vol. 168, p. 112510
Extracellular vesicles (EVs) have the ability to function as molecular vehicles and could therefore be harnessed to deliver drugs to target cells in diseases such as cancer. The composition of EVs determines their function as well as their interactions with cells, which consequently affects the cell uptake efficacy of EVs.[...]

Personalized immunoglobulin aptamers for detection of multiple myeloma minimal residual disease in serum

Publication year: 2020
Authors: Claudia Tapia-Alveal, Timothy R. Olsen, Tilla S. Worgall
Published in: Communications Biology, Vol. 3 (2020), 781
Multiple myeloma (MM) is a neoplasm of plasma cells that secrete patient specific monoclonal immunoglobulins. A recognized problem in MM treatment is the early recognition of minimal residual disease (MRD), the major cause of relapse. [...]

Multi-response optimization of chromium/gold-based nanofilm Kretschmann-based surface plasmon resonance glucose sensor using finite-difference time-domain and Taguchi method

Publication year: 2020
Authors: Najmiah Radiah Mohamad 1,2, Mohd Farhanulhakim Mohd Razip Wee 1, Mohd Ambri Mohamed 1, Azrul Azlan Hamzah 1, P Susthitha Menon 1
Published in: Nanomaterials and Nanotechnology, 2020, Vol. 10
Kretschmann-based surface plasmon resonance sensor utilizing chromium and gold nanofilms is ideal for label-free biomedical sensing. In this work, Taguchi’s L9 orthogonal array method was used [...]

Heparin/Collagen Surface Coatings Modulate the Growth, Secretome and Morphology of Human Mesenchymal Stromal Cell Response to Interferon‐Gamma

Publication year: 2020
Authors: Cifuentes S. 1, Priyadarshani P. 23,Castilla‐Casadiego D. 4, Mortensen L. 23,Almodóvar J. 4, Domenech M. 15
Published in: Journal of Biomedical Materials Research, 2020
The therapeutic potential of human mesenchymal stromal cells (h‐MSC) is dependent on the viability and secretory capacity of cells both modulated by the culture environment. Our previous studies introduced heparin and collagen I (HEP/COL) alternating stacked layers as a potential substrate to enhance the secretion of immunosuppressive factors of h‐MSCs. [...]

Mild reduction-promoted sandwich aptasensing for simple and versatile detection of protein biomarkers

Publication year: 2020
Authors: Bing Han, Langjian Dong, Lingling Li, Lingjun Sha, Ya Cao*, Jing Zhao*
Published in: Sensors and Actuators B: Chemical, 2020, Vol. 325, p. 128762
Sandwich format has drawn considerable attention in aptasensing in view of simple design, convenient and stable application, and easy coupling with signal amplification strategies; however, developing [...]

Partitioning of Catechol Derivatives in Lipid Membranes: Implications for Substrate Specificity to Catechol-O-methyltransferase

Publication year: 2020
Authors: Parkkila P., Viitala T.
Published in: ACS Chemical Neuroscience, 2020, Vol.11, 6, p. 969–978
We have utilized multiparametric surface plasmon resonance and impendance-based quartz crystal microbalance instruments to study the distribution coefficients of catechol derivatives in cell model membranes. Our findings verify that the octanol–water partitioning coefficient is a poor descriptor of the total lipid affinity for small molecules which show limited lipophilicity in the octanol–water system.[...]

Monitoring biomolecular interaction between folic acid and bovine serum albumin

Publication year: 2020
Authors: Chilom C.G. a, David M. b, Florescu M. b
Published in: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2020, Vol. 230, p.118074
Folic acid is a bioactive food component whose deficiency can lead to a variety of health problems, while a high intake of folic acid can reduce the cytotoxicity of natural killer cells. The binding mechanism of folic acid to free bovine serum albumin (BSA) was studied using fluorescence, while the biomolecular interaction between confined-BSA and free folic acid was assessed by electrochemical methods and surface plasmon resonance. [...]

A label-free lead(II) ion sensor based on surface plasmon resonance and DNAzyme-gold nanoparticle conjugates

Publication year: 2020
Authors: Huanan Wu 1, Shuokang Wang 1, Sam Fong Yau Li 2, Qi Bao 1, Qiyong Xu 1
Published in: Analytical and Bioanalytical Chemistry, 2020, Vol. 412, p.7525–7533
Detection of lead(II) (Pb2+) ions in water is important for the protection of human health and environment. The growing demand for onsite detection still faces challenges for sensitive and easy-to-use methods. [...]

Diffusion and Protein Corona Formation of Lipid-Based Nanoparticles in the Vitreous Humor: Profiling and Pharmacokinetic Considerations

Publication year: 2020
Authors: Tavakoli S 1., Kari O.K. 1, Turunen T. 1, Lajunen T. 1, Schmitt M. 1, Lehtinen J. 1, Tasaka F. 2, Parkkila P. 1, Ndika J. 3, Viitala T. 1, Alenius H. 3,5, Urtti, A. 1,6,7 Subriz A. *7
Published in: Molecular Pharmaceutics, 2020
The vitreous humor is the first barrier encountered by intravitreally injected nanoparticles. Lipid-based nanoparticles in the vitreous are studied by evaluating their diffusion with single-particle tracking technology and by characterizing their protein coronae with surface plasmon resonance and high-resolution proteomics. Single-particle tracking results indicate that the vitreal mobility of the formulations is dependent on their charge.[...]

Competitive upconversion-linked immunoassay using peptide mimetics for the detection of the mycotoxin zearalenone

Publication year: 2020
Authors: Riikka Peltomaa a,b,1, Zdeněk Farka a,c, Matthias J. Mickert a,2, Julian C. Brandmeier a, Matěj Pastucha c, Antonín Hlaváček d, Mónica Martínez-Orts e, Ángeles Canales e, Petr Skládal c, Elena Benito-Peña b, María C. Moreno-Bondi b, Hans H. Gorris a
Published in: Biosensors and Bioelectronics, Vol. 170, p. 112683
Due to increasing food safety standards, the analysis of mycotoxins has become essential in the food industry. In this work, we have developed a competitive upconversion-linked immunosorbent assay (ULISA) [...]

Mechanism of lysozyme adsorption onto gold surface determined by quartz crystal microbalance and surface plasmon resonance

Publication year: 2020
Authors: Komorek P., Wałek M., Jachimska B.
Published in: Bioelectrochemistry, 2020, Vol. 135, p. 107582
In this study, the physicochemical characterization of lysozyme adsorbed on gold was investigated. Through the use of MP-SPR it was possible to establish that the orientation of molecules changes from side-on to between or end-on with increasing surface coverage.[...]

Comparative Characterization of Plasmodium falciparum Hsp70-1 Relative to E. coli DnaK Reveals the Functional Specificity of the Parasite Chaperone

Publication year: 2020
Authors: Lebepe C. 1, Matambanadzo P. 1, Makhoba X. 2, Achilonu I. 3, Zininga T. 1,4, Shonhai A. 1,*
Published in: Biomolecules 2020, Vol. 10(6), p. 856
Hsp70 is a conserved molecular chaperone. How Hsp70 exhibits specialized functions across species remains to be understood. Plasmodium falciparum Hsp70-1 (PfHsp70-1) and Escherichia coli DnaK are cytosol localized molecular chaperones that are important for the survival of these two organisms. [...]

Surfactant Interactions with Protein-Coated Surfaces: Comparison between Colloidal and Macroscopically Flat Surfaces

Publication year: 2020
Authors: Mateos H. 1,*, Valentini A. 2, Lopez F. 3, Palazzo G. 4
Published in: Biomimetics 2020, Vol. 5(3), p. 31
Surface interactions with polymers or proteins are extensively studied in a range of industrial and biomedical applications to control surface modification, cleaning, or biofilm formation. In this study we compare surfactant interactions with protein-coated silica surfaces differing in the degree of curvature (macroscopically flat and colloidal nanometric spheres). The interaction with a flat surface was probed by means of surface plasmon resonance (SPR) while dynamic light scattering (DLS) was used to study the interaction with colloidal SiO2 (radius 15 nm).Surface interactions with polymers or proteins are extensively studied in a range of industrial and biomedical applications to control surface modification, cleaning, or biofilm formation. In this study we compare surfactant interactions with protein-coated silica surfaces differing in the degree of curvature (macroscopically flat and colloidal nanometric spheres). The interaction with a flat surface was probed by means of surface plasmon resonance (SPR) while dynamic light scattering (DLS) was used to study the interaction with colloidal SiO2 (radius 15 nm).[...]

It takes two to tango - The case of thebaine 6-O-demethylase

Publication year: 2020
Authors: Kachhap S. a*, Wojdyla Z. a*, Komorek P. a, Kluza A. a, Kurpiewska K. ab, Jachimska B. a,Borowski T.a
Published in: nternational Journal of Biological Macromolecules, 2020, Vol. 163, p. 718-729
Thebaine 6-O-demethylase (T6ODM) is an Fe(II)/2-oxoglutarate-dependent dioxygenase catalysing two oxidative O-demethylation reactions in morphine biosynthesis. Its crystal structure revealed a large active site pocket which is at least two times larger than necessary to accommodate a substrate (thebaine or oripavine) molecule.[...]

Tunable layer-by-layer films containing hyaluronic acid and their interactions with CD44

Publication year: 2020
Authors: Amorim S.abc, Pashkuleva I. ab, Reis C. defg, Reis R.abc, Pires R. abc
Published in: Journal of Materilals Chemistry, 2020, issue 17
We report on the development of layer-by-layer (LbL) constructs whose viscoelastic properties and bioactivity can be finely tuned by using polyanions of different size and/or crosslinking. As a polyanion we used hyaluronic acid (HA) – a multi-signaling biomolecule whose bioactivity depends on its molecular weight.

Kinetic and thermodynamic insights into interaction of albumin with piperacillin: Spectroscopic and molecular modeling approaches

Publication year: 2019
Authors: Farzaneh Fathi a, Maryam Sharifi b, c, d, Amir Jafari e, Naser Kakavandi f, Soheila Kashanian g, h, Jafar Ezzati Nazhad Dolatabadi c, *, Mohammad-Reza Rashidi c, i, **
Published in: Journal of Molecular Liquids
The current study investigated the binding of BSA and piperacillin at multifarious concentrations (1 e128 mM) along with four different temperatures. To do this, three sensitive methods were employed including surface plasmon resonance (SPR), fluorescence spectroscopy and molecular docking (MD). [...]

Label-free lateral flow assay for Listeria monocytogenes by aptamer-gated release of signal molecules

Publication year: 2019
Authors: Tasbasi BB 1, Guner BC 1, Sudagidan M 1, Ucak S 2, Kavruk M3, Ozalp VC 4.
Published in: Analytical Biochemistry
Lateral flow assay (LFA) type of biosensors have been popular due to cost-effectiveness and easy-interpretation for instant results, most common examples of applications being pregnancy tests, food safety or medical diagnostics. There are several examples of reports with high sensitivity, including pre-concentration of the sample by magnetic pull-down. However, sensitivity and direct detection designs with aptamers has been a limiting factor for developing aptamers-based LFA assays. [...]

Extracellular nicotinate phosphoribosyltransferase binds Toll like receptor 4 and mediates inflammation

Publication year: 2019
Authors: Antonella Managò1,12, Valentina Audrito1,12, Francesca Mazzola2, Leonardo Sorci 3, Federica Gaudino1, Katiuscia Gizzi4, Nicoletta Vitale5, Danny Incarnato6, Gabriele Minazzato7, Alice Ianniello8, Antonio Varriale9, Sabato D’Auria9, Giulio Mengozzi8, Gianfranco Politano 10, Salvatore Oliviero 4,11, Nadia Raffaelli7,13 & Silvia Deaglio 1,13
Published in: Nature communications
Damage-associated molecular patterns (DAMPs) are molecules that can be actively or passively released by injured tissues and that activate the immune system. Here we show that nicotinate phosphoribosyltransferase (NAPRT), detected by antibody-mediated assays and mass spectrometry, is an extracellular ligand for Toll-like receptor 4 (TLR4) and a critical mediator of inflammation, acting as a DAMP. Exposure of human and mouse macrophages to NAPRT activates the inflammasome and NF-κB for secretion of inflammatory cytokines. [...]