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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. [...]

Acceleration of biofilm formation in start-up of sequencing batch biofilm reactor using carriers immobilized with Pseudomonas stutzeri strain XL-2

Publication year: 2020
Authors: Zhang P., Ding X., Zhao B. ⁎, An Q., Guo J.S.
Published in: Bioresource Technology, 2020, vol. 314
P. stutzeri strain XL-2 initially immobilized on polypropylene carriers accelerated the biofilm formation in startup of sequencing batch biofilm reactor (SBBR) (denoted R1). The biofilm formation in R1 was approximately completed in 36 days, which was shorter than that of 48 days in an identical SBBR (denoted R2) without strain XL-2.P. stutzeri strain XL-2 initially immobilized on polypropylene carriers accelerated the biofilm formation in startup of sequencing batch biofilm reactor (SBBR) (denoted R1). The biofilm formation in R1 was approximately completed in 36 days, which was shorter than that of 48 days in an identical SBBR (denoted R2) without strain XL-2.P. stutzeri strain XL-2 initially immobilized on polypropylene carriers accelerated the biofilm formation in startup of sequencing batch biofilm reactor (SBBR) (denoted R1). The biofilm formation in R1 was approximately completed in 36 days, which was shorter than that of 48 days in an identical SBBR (denoted R2) without strain XL-2.[...]

Generic High-Capacity Electrochemical Capture and Release of Proteins by Polyelectrolyte Brushes

Publication year: 2020
Authors: Ferrand-Drake del Castillo G., Adali Z., L. N. Hailes R., Xiong K., Dahlin A.*
Published in: Preprint in Chem RXIV, 2020
We present a polyelectrolyte brush electrode with high-capacity for protein immobilization that captures and releases proteins by an electrochemical potential. Central to our concept is the use of polyelectrolyte brushes that switch reversibly by electrochemistry.[...]

Matter‐tag: A universal immobilization platform for enzymes on polymers, metals, and silicon‐based materials

Publication year: 2020
Authors: Dedisch S. 12, Wiens A. 2, Davari M.D. 2, Söder D. 1, Rodriguez‐Emmenegger C. 13, Jakob F. 12, Schwaneberg U.*12
Published in: Biotechnology and Bioengineering, 2020, Vol. 117, Issue1, p. 49-61
Enzyme immobilization is extensively studied to improve enzyme properties in catalysis and analytical applications. Here, we introduce a simple and versatile enzyme immobilization platform based on adhesion‐promoting peptides, namely Matter‐tags. Matter‐tags immobilize enzymes in an oriented way as a dense monolayer.[...]

Following in Situ the Degradation of Mesoporous Silica in Biorelevant Conditions: At Last, a Good Comprehension of the Structure Influence

Publication year: 2020
Authors: Bindini E. 1,2, Chehadi Z. 1, Faustini M. 1, Albouy P. 3, Grosso D. 4, Cattoni A. 2, Chanéac C. 1, Azzaroni O. 5, Sanchez C. 1, Boissiè C. 1
Published in: ACS Applied Materials and Interfaces, 2020, Vol.12, p.13598–13612
Mesoporous silica nanoparticles (MSNs) have seen a fast development as drug delivery carriers thanks to their tunable porosity and high loading capacity. The employ of MSNs in biomedical applications requires a good understanding of their degradation behavior both to control drug release and to assess possible toxicity issues on human health.[...]

In situ analysis of liposome hard and soft protein corona structure and composition in a single label-free workflow

Publication year: 2020
Authors: Kari O. *ab, Ndika J. c, Parkkila P. b, Louna A. a, Lajunen T. ǂa, Puustinen A. d, Viitala T. *§b, Alenius H. ce, Urtti A. af
Published in: Nanoscale, 2020, Vol. 12, p. 1728
Methodological constraints have limited our ability to study protein corona formation, slowing nanomedicine development and their successful translation into the clinic. We determined hard and soft corona structural properties along with the corresponding proteomic compositions on liposomes in a label-free workflow: surface plasmon resonance and a custom biosensor for in situ structure determination on liposomes and corona separation, and proteomics using sensitive nanoliquid chromatography tandem mass spectrometry with open-source bioinformatics platforms.[...]

CVD-grown Graphene-on-Au characterization and sensing using Kretschmann-based SPR

Publication year: 2020
Authors: Jamil N.A.1, Mei G.S.1, Zain A.R. 1,2, Hewak D. 3, Huang C-C. 3, Mohamed M.A. 1, Majlis B.Y. 1, Menon P.S.1,*
Published in: Electron Devices Technology and Manufacturing Conference (EDTM), IEEE
A Kretschmann-based surface plasmon resonance (SPR) sensing method was used to determine the refractive index and thickness of graphene thin films. The measured complex refractive index (n,k) values of graphene on Au at 670 nm and 785 nm wavelength are 2.85, 0.74 and 3.1, 1.19 respectively. In further analysis, the analysis of sensing performance of graphene on Au SPR sensor for ethanol detection was obtained using Finite Difference Time Domain (FDTD) method.[...]

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).[...]

Enzyme Immobilization in Polyelectrolyte Brushes: High Loading and Enhanced Activity Compared to Monolayers

Publication year: 2019
Authors: del Castillo G.F-D. a, Koenig M. b, Mueller M. b, d, Eichhorn K.-J. b, Stamm M. b,d, Uhlmann P. b,c, Dahlin A. a
Published in: Langmuir, 2019, Vol. 35, p. 3479-3489
Catalysis by enzymes on surfaces has many applications. However, strategies for efficient enzyme immobilization with preserved activity are still in need of further development. [...]

Trypanosoma cruzi Virulence Factors for the Diagnosis of Chagas’ Disease

Publication year: 2019
Authors: Cecilia Yamil Chain,*,† Dênio Emanuel Pires Souto,*,‡ María Laura Sbaraglini,§ Carlos A. Labriola,∥ María Antonieta Daza Millone,† Eduardo Alejandro Ramirez,† José Sebastián Cisneros,† Constanza Lopez-Albizu,⊥ Karenina Scollo,⊥ Lauro T. Kubota,# Andrés Mariano Ruiz,⊥ and María Elena Vela†
Published in: ACS Infectious Diseases
trans-Sialidase and cruzipain are important virulence factors from Trypanosoma cruzi, the etiological agent of Chagas disease, that have highly antigenic domains in their structure and were reported as potential tools for diagnosis of the illness. [...]

Maleic anhydride and acetylene plasma copolymer surfaces for SPR immunosensing

Publication year: 2019
Authors: Makhneva E. 1,2, Farka Z. 3, Pastucha M. 4,5, Obrusník A. 1,2, Horáčková V. 4, Skládal P. 4,5, Zajíčková L. 1,2
Published in: Analytical and Bioanalytical Chemisry, 2019
We report on the successful application of carboxyl-rich plasma polymerized (PP) films as a matrix layer for bioreceptor immobilization in surface plasmon resonance (SPR) immunosensing. Composition and [...]

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. [...]

Layer‐by‐Layer Formation of Polyamine‐Salt Aggregate/Polyelectrolyte Multilayers. Loading and Controlled Release of Probe Molecules from Self‐Assembled Supramolecular Networks

Publication year: 2019
Authors: Herrera S.E. 1, Agazzi M.L. 1, Cortez M.L. 1, Marmisollé W.A. 1, von Bildering C. 1,2, Azzaroni O. 1
Published in: Macromolecular Chemistry and Physics, 2019
The use of soft materials as building blocks in layer‐by‐layer (LbL) assemblies represent a very appealing and useful approach to enhance the loading capacity of thin films. Here, the capacity of positively charged polyamine‐salt aggregates (PSAs) [...]

A highly specific and sensitive nanoimmunosensor for the diagnosis of neuromyelitis optica spectrum disorders

Publication year: 2019
Authors: Ariana de Souza Moraes 1,2,3, Doralina Guimarães Brum3,4, Jéssica Cristiane Magalhães Ierich 1,2,3, Akemi Martins Higa1,2,3, Amanda Stefanie Jabur Assis2,3, Celina Massumi Miyazaki2, Flávio Makoto Shimizu5, Luís Antonio Peroni 6, M. Teresa Machini7, Amilton Antunes Barreira8,9, Marystela Ferreira 2, Osvaldo N. Oliveira Jr.5 & Fabio Lima Leite2,3
Published in: Scientific Reports
A precise diagnosis for neuromyelitis optica spectrum disorders (NMOSD) is crucial to improve patients’ prognostic, which requires highly specific and sensitive tests. The cell-based assay with a sensitivity of 76% and specificity of 100% is the most recommended test to detect anti-aquaporin-4 antibodies (AQP4-Ab). [...]

Self-assembled hybrid nanocomposite films of carbon dots and hydrolyzed collagen

Publication year: 2019
Authors: Tarciane da S. Pinto a, Priscilla N.S. Rodrigues a, Luiz E.S. Marinho a, Rodrigo M. Verly a, J.P. Bretas Roa a, Luiz C.A. de Oliveira b, Fabiano V. Pereira b, Mariana T.Q. de Magalhães c,d, João P. de Mesquita a
Published in: Materials Chemistry and Physics, 2019, Vol. 230, p. 44-53
In the present work, hydrophilic carbon dots (CD) prepared by cotton cellulose were used in the building of self-assembled films with hydrolyzed collagen (CL) to verify their properties, especially molecular interactions and morphology. [...]

Synergy between Zwitterionic Polymers and Hyaluronic Acid Enhances Antifouling Performance

Publication year: 2019
Authors: Yinqiang Xia,† Vahid Adibnia,‡ Cancan Shan,† Renliang Huang,§ Wei Qi,†,# Zhimin He,† Guojun Xie,∥ Mateusz Olszewski,∥ Gregory De Crescenzo,⊥ Krzysztof Matyjaszewski,*,∥ Xavier Banquy,*,‡ and Rongxin Su*,†,#
Published in: Langmuir
Challenges associated with nonspecific adsorption of proteins on sensor surfaces have steered the development of novel antifouling materials and strategies. Inspired by human synovial fluid composition and structure, we designed synergistic antifouling coatings with mixtures of hyaluronic acid (HA) and a zwitterionic bottlebrush polymer (BB). [...]

Real-Time Label-Free Targeting Assessment and in Vitro Characterization of Curcumin-Loaded Poly-lactic-co-glycolic Acid Nanoparticles for Oral Colon Targeting

Publication year: 2019
Authors: Mohamed A. Akl,†,‡ Alma Kartal-Hodzic,† Teemu Suutari,† Timo Oksanen,† Isabella Monia Montagner,§ Antonio Rosato,§,∥ Hatem R. Ismael,‡ Mohsen I. Afouna,‡ Paolo Caliceti,⊥ Marjo Yliperttula,†,⊥ Ahmed M. Samy,‡ Francesca Mastrotto,⊥ Stefano Salmaso,⊥ and Tapani Viitala*,†,#
Published in: ASC Omega
The exploitation of curcumin for oral disease treatment is limited by its low solubility, poor bioavailability, and low stability. Surface-functionalized poly-lactic-co-glycolic acid (PLGA) nanoparticles (NPs) have shown promising results to ameliorate selective delivery of drugs to the gastrointestinal tract. [...]

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). [...]

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. [...]

ORP2 interacts with phosphoinositides and controls the subcellular distribution of cholesterol

Publication year: 2019
Authors: Koponen A. a, Arora A. a, Takahashi K. b, Kentala H. a, Kivelä A.M. a, Jääskeläinen E. a, Peränen J. b, Somerharju P. c, Ikonen E. b, Viitala T. d, Olkkonen V.M. a,b
Published in: Biochimie, 2019, Vol. 158, p. 90-101
ORP2 is a sterol-binding protein with documented functions in lipid and glucose metabolism, Akt signaling, steroidogenesis, cell adhesion, migration and proliferation. [...]