scholarly journals Fast and Sensitive Bacteria Detection by Boronic Acid Modified Fluorescent Dendrimer

Sensors ◽  
2021 ◽  
Vol 21 (9) ◽  
pp. 3115
Author(s):  
Ayame Mikagi ◽  
Riho Tsurufusa ◽  
Yuji Tsuchido ◽  
Takeshi Hashimoto ◽  
Takashi Hayashita
Keyword(s):  
Boronic Acid ◽  
Electrostatic Interactions ◽  
Detection Method ◽  
Phenylboronic Acid ◽  
Bacteria Detection ◽  
Gram Negative Bacteria ◽  
Recognition Method ◽  
Dansyl Group ◽  
Colony Forming Units ◽  
Phenylboronic Acids

This study reports a novel, fast, easy, and sensitive detection method for bacteria which is urgently needed to diagnose infections in their early stages. Our work presents a complex of poly(amidoamine) dendrimer modified by phenylboronic acid and labeled by a fluorescent dansyl group (Dan-B8.5-PAMAM). Our system detects bacteria in 20 min with a sensitivity of approximately 104 colony-forming units (CFU)·mL−1. Moreover, it does not require any peculiar technical skills or expensive materials. The driving force for bacteria recognition is the binding between terminal phenylboronic acids on the probe and bacteria’s surface glycolipids, rather than electrostatic interactions. The aggregation caused by such binding reduces fluorescence. Even though our recognition method does not distinguish between live or dead bacteria, it shows selective antibacterial activity towards Gram-negative bacteria. This study may potentially contribute a new method for the convenient detection and killing of bacteria.

Detection of Escherichia coli O157:H7 and Salmonella enterica serotype Typhimurium based on cell elongation induced by beta-lactam antibiotics

The Analyst ◽  
2019 ◽  
Vol 144 (15) ◽  
pp. 4505-4512 ◽  
Author(s):  
Min Jia ◽  
Zhaochen Liu ◽  
Chuanchen Wu ◽  
Zhen Zhang ◽  
Luyao Ma ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Cell Elongation ◽  
Membrane Filtration ◽  
Detection Method ◽  
Bacteria Detection ◽  
Escherichia Coli O157 ◽  
Gram Negative Bacteria ◽  
Beta Lactam ◽  
Gram Negative ◽  
Beta Lactam Antibiotics

A novel Gram-negative bacteria detection method based on cell elongation combined with membrane filtration and magnetic separation was established.

scholarly journals Amination-reduction reaction as simple protocol for potential boronic molecular receptors. Insight in supramolecular structure directed by weak interactions

2011 ◽  
Vol 9 (2) ◽  
pp. 199-205 ◽  
Author(s):  
Agnieszka Adamczyk-Woźniak ◽  
Izabela Madura ◽  
Alicja Pawełko ◽  
Andrzej Sporzyński ◽  
Anna Żubrowska ◽  
...  
Keyword(s):  
Boronic Acid ◽  
Weak Interactions ◽  
Layer Structure ◽  
Phenylboronic Acid ◽  
Reduction Reaction ◽  
Significant Rise ◽  
Molecular Receptors ◽  
Simple Protocol ◽  
Phenylboronic Acids ◽  
Insight Into

AbstractThe synthesis of the potential molecular receptors in the amination-reduction reaction has been investigated within the model system comprising (2-formylphenyl)boronic acid and morpholine. The 3-amine substituted benzoxaborole was identified to be the intermediate of the synthesis and the unsubstituted benzoxaborole as the by-product resulting from reduction of the starting material. The insight into the reactivity of the starting materials as well as the intermediate benzoxaborole enabled significant rise in the yield of 2-(aminomethyl) phenylboronic acids synthesis. The solid state structure of 2-(piperidylmethyl)phenylboronic acid has been re-determined, and the description of the molecule and the crystal is given. The supramolecular layer structure directed by the weak C-H…O and C-H…π interactions was identified and scrutinized based on the geometry and Hirshfeld surface analyses

Using Quenching Kinetics and Thermodynamics of Amino-Fluorophores as Empirical Tools for Predicting Boronic Acid Sensors Suitable for Use in Physiological Conditions

2011 ◽  
Vol 64 (11) ◽  
pp. 1438 ◽  
Author(s):  
Nicholas McGregor ◽  
Christophe Pardin ◽  
W. G. Skene
Keyword(s):  
Electron Transfer ◽  
Fluorescence Quenching ◽  
Boronic Acid ◽  
Sulfonic Acid ◽  
Phenylboronic Acid ◽  
Water Soluble ◽  
Time Resolved ◽  
Diffusion Limited ◽  
Phenylboronic Acids ◽  
Acid Sensors

A series of water-soluble 1-amino-naphthalenes and 2-amino-fluorenes are prepared. These serve as model fluorophores for measuring the thermodynamics and kinetics of fluorescence quenching with phenylboronic acids and aliphatic amines. Steady-state and time-resolved fluorescence quenching kinetics are investigated using the Stern–Volmer method. Diffusion limited quenching constants and exergonic thermodynamics of electron transfer are derived for the 5-amino-1-napthol and 2-aminofluorene derivatives with phenylboronic acid and/or an aliphatic imine. No quenching and endergonic thermodynamics or electron transfer are observed for 5-sulfonamide, 5-sulfonic acid, or 5-hydroxy-7-sulfonic acid aminonaphthalene derivatives. Boronic acid sensors synthesized from these aminofluorophores by reductive amination with 2-formylphenylboronic acid undergo fluorescence revival in the presence of saccharides only when the fluorophore demonstrates diffusion limited quenching kinetics and exergonic thermodynamics of electron transfer with the boronic acid or imine quenchers. Thus, these two properties are suitable empirical tools for predicting saccharide-induced fluorescence revival of boronic acid sensors.

scholarly journals Recognition of Bimolecular Logic Operation Pattern Based on a Solid-State Nanopore

Sensors ◽  
2020 ◽  
Vol 21 (1) ◽  
pp. 33
Author(s):  
Han Yan ◽  
Zhen Zhang ◽  
Ting Weng ◽  
Libo Zhu ◽  
Pang Zhang ◽  
...  
Keyword(s):  
Self Assembly ◽  
Detection Method ◽  
Logic Gate ◽  
Detection Methods ◽  
Label Free ◽  
Recognition Method ◽  
Operation Pattern ◽  
Simple Detection ◽  
Dna Tetrahedron ◽  
Marker Molecule

Nanopores have a unique advantage for detecting biomolecules in a label-free fashion, such as DNA that can be synthesized into specific structures to perform computations. This method has been considered for the detection of diseased molecules. Here, we propose a novel marker molecule detection method based on DNA logic gate by deciphering a variable DNA tetrahedron structure using a nanopore. We designed two types of probes containing a tetrahedron and a single-strand DNA tail which paired with different parts of the target molecule. In the presence of the target, the two probes formed a double tetrahedron structure. As translocation of the single and the double tetrahedron structures under bias voltage produced different blockage signals, the events could be assigned into four different operations, i.e., (0, 0), (0, 1), (1, 0), (1, 1), according to the predefined structure by logic gate. The pattern signal produced by the AND operation is obviously different from the signal of the other three operations. This pattern recognition method has been differentiated from simple detection methods based on DNA self-assembly and nanopore technologies.

scholarly journals Antibacterial Activity of Prismatomeris tetrandra K. Schum Root Extract against Antibiotic Resistance Bacteria

2018 ◽  
Vol 16 (5) ◽  
pp. 341-348
Author(s):  
On-Anong SOMSAP
Keyword(s):  
Antibacterial Activity ◽  
Antibiotic Resistance ◽  
Culture Broth ◽  
Diffusion Method ◽  
Resistant Bacteria ◽  
Root Extract ◽  
Gram Negative Bacteria ◽  
Antibiotic Resistant ◽  
Gram Positive Bacteria ◽  
Colony Forming Units

Antibiotic resistance bacteria has become an increasing problem now today due to many factors. This study investigates the efficacy of Prismatomeris tetrandra K. Schum root extract as a new source of antibacterial activity for antibiotic resistant bacteria using agar well diffusion method. The results showed that S. aureus TISTR517 exhibited more sensitivity to P. tetrandra K. Schum root extract than other Gram-positive bacteria indicator strains. On the other hand, Gram-negative bacteria exhibited resistance to P. tetrandra K. Schum root extract. The study further showed the activity between P. tetrandra K. Schum root extract and gentamycin (10 µg), it revealed that MRSA142 was resistant to gentamycin (10µg) but sensitive to P. tetrandra K. Schum root extract. Minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) was evaluated by using S. aureus TISTR517 and MRSA142 as indicator strains. The MIC value was 0.59 mg/mL and 1.17 mg/mL for S. aureus TISTR517 and MRSA142, respectively. MBC assay demonstrated that the MBC value was 9.75 mg/mL and 150 mg/mL for S. aureus TISTR517 and MRSA142 respectively. The mode of action was investigated with the presence of P. tetrandra K. Schum root extract in the culture broth. The action of P. tetrandra K. Schum root extract was revealed of bacteriostatic activity due to the Optical density (OD) at 600 nm and Colony-Forming Units (CFU) of indicator strains were continuously decreased.

scholarly journals Binding From both sides: TolR and full-length OmpA bind and maintain the local structure of the E. coli cell wall

2018 ◽  
Author(s):  
Alister T. Boags ◽  
Firdaus Samsudin ◽  
Syma Khalid
Keyword(s):  
Cell Wall ◽  
Electrostatic Interactions ◽  
Cell Envelope ◽  
Binding Domain ◽  
Gram Negative Bacteria ◽  
Inner Membrane ◽  
E Coli ◽  
Non Covalent Interactions ◽  
Covalent Interactions

SUMMARYWe present a molecular modeling and simulation study of the of the E. coli cell envelope, with a particular focus on the role of TolR, a native protein of the E. coli inner membrane in interactions with the cell wall. TolR has been proposed to bind to peptidoglycan, but the only structure of this protein thus far is in a conformation in which the putative peptidoglycan binding domain is not accessible. We show that a model of the extended conformation of the protein in which this domain is exposed, binds peptidoglycan largely through electrostatic interactions. We show that non-covalent interactions of TolR and OmpA with the cell wall, from the inner membrane and outer membrane sides respectively, maintain the position of the cell wall even in the absence of Braun’s lipoprotein. When OmpA is truncated to remove the peptidoglycan binding domain, TolR is able to pull the cell wall down towards the inner membrane. The charged residues that mediate the cell-wall interactions of TolR in our simulations, are conserved across a number of species of Gram-negative bacteria.

scholarly journals Adsorption and Release of Rose Bengal on Layer-by-Layer Films of Poly(Vinyl Alcohol) and Poly(Amidoamine) Dendrimers Bearing 4-Carboxyphenylboronic Acid

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1854 ◽  
Author(s):  
Kentaro Yoshida ◽  
Akane Yamaguchi ◽  
Hiroki Midorikawa ◽  
Toshio Kamijo ◽  
Tetsuya Ono ◽  
...  
Keyword(s):  
Rose Bengal ◽  
Boronic Acid ◽  
Vinyl Alcohol ◽  
Acidic Solution ◽  
Phenylboronic Acid ◽  
Poly Vinyl Alcohol ◽  
Basic Solution ◽  
Layer By Layer ◽  
Lbl Films ◽  
H2o2 Solution

Phenylboronic acid-bearing polyamidoamine dendrimer (PBA-PAMAM)/poly(vinyl alcohol) (PVA) multilayer films were prepared through the layer-by-layer (LbL) deposition of PBA-PAMAM solution and PVA solution. PBA-PAMAM/PVA films were constructed successfully through the formation of boronate ester bonds between the boronic acid moiety in PBA and 1,3-diol units in PVA. When the (PBA-PAMAM/PVA)5 films were immersed in rose bengal (RB) solution, RB was adsorbed onto the LbL films. The amount of RB adsorbed was higher in the LbL films immersed in acidic solution than in basic solution. The release of RB from the LbL films was also promoted in the basic solution, while it was suppressed in the acidic solution. The boronic acid ester is oxidized to phenol by hydrogen peroxide (H2O2) and the carbon-boron bond is cleaved, so that the (PBA-PAMAM/PVA)5 films can be decomposed by immersion in H2O2 solution. Therefore, when RB-adsorbed (PBA-PAMAM/PVA)5 films were immersed in H2O2 solution, the release of RB was moderately promoted when the solution was weakly acidic.

scholarly journals Discovery of 2-[5-(4-Fluorophenylcarbamoyl)pyridin-2-ylsulfanylmethyl]phenylboronic Acid (SX-517): Noncompetitive Boronic Acid Antagonist of CXCR1 and CXCR2

2014 ◽  
Vol 57 (20) ◽  
pp. 8378-8397 ◽  
Author(s):  
Dean Y. Maeda ◽  
Angela M. Peck ◽  
Aaron D. Schuler ◽  
Mark T. Quinn ◽  
Liliya N. Kirpotina ◽  
...  
Keyword(s):  
Boronic Acid ◽  
Phenylboronic Acid ◽  
Acid Antagonist

scholarly journals Recent Advances in Phenylboronic Acid-Based Gels with Potential for Self-Regulated Drug Delivery

Molecules ◽  
2019 ◽  
Vol 24 (6) ◽  
pp. 1089 ◽  
Author(s):  
Chenyu Wang ◽  
Bozhong Lin ◽  
Haopeng Zhu ◽  
Fei Bi ◽  
Shanshan Xiao ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Physicochemical Properties ◽  
Boronic Acid ◽  
Drug Delivery Systems ◽  
Phenylboronic Acid ◽  
3D Structure ◽  
Three Dimensional ◽  
Drug Carriers ◽  
Delivery Systems ◽  
Diabetes Therapy

Glucose-sensitive drug platforms are highly attractive in the field of self-regulated drug delivery. Drug carriers based on boronic acid (BA), especially phenylboronic acid (PBA), have been designed for glucose-sensitive self-regulated insulin delivery. The PBA-functionalized gels have attracted more interest in recent years. The cross-linked three-dimensional (3D) structure endows the glucose-sensitive gels with great physicochemical properties. The PBA-based platforms with cross-linked structures have found promising applications in self-regulated drug delivery systems. This article summarizes some recent attempts at the developments of PBA-mediated glucose-sensitive gels for self-regulated drug delivery. The PBA-based glucose-sensitive gels, including hydrogels, microgels, and nanogels, are expected to significantly promote the development of smart self-regulated drug delivery systems for diabetes therapy.

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