Search results for: Otto S. Wolfbeis

Items from 1 to 20 out of 180 results

article

A MXene‐Based Wearable Biosensor System for High‐Performance In Vitro Perspiration Analysis

Yongjiu Lei, Wenli Zhao, Yizhou Zhang, Qiu Jiang, more

Small > 15 > 19 > n/a - n/a

Wearable electrochemical biosensors for sweat analysis present a promising means for noninvasive biomarker monitoring. However, sweat‐based sensing still poses several challenges, including easy degradation of enzymes and biomaterials with repeated testing, limited detection range and sensitivity of enzyme‐based biosensors caused by oxygen deficiency in sweat, and poor shelf life of sensors using...

article

Expression of Concern: Magnetic mesoporous polymelamine-formaldehyde resin as an adsorbent for endocrine disrupting chemicals

Otto S. Wolfbeis

Microchimica Acta > 2018 > 185 > 4 > 1-1

The Editor-in-Chief is issuing an editorial expression of concern regarding the article Microchim Acta (2018) 185: 19.

article

Europium-doped GdVO4 nanocrystals as a luminescent probe for hydrogen peroxide and for enzymatic sensing of glucose

Verena Muhr, Markus Buchner, Thomas Hirsch, Dragana J. Jovanović, more

Sensors and Actuators B: Chemical > 2017 > 241 > C > 349-356

The authors describe the preparation of Eu³⁺-doped GdVO₄ nanocrystals (NCs) by precipitation of the Gd³⁺(Eu³⁺)-citrate complex which was then converted to the respective vanadate by dialysis. The fractions of Eu³⁺ ranged from 5 to 100mol%. The NCs were characterized by XRD, TEM, ICP-OES and dynamic light scattering which revealed that they possess superior colloidal stability in aqueous solutions...

chapter

Optical Technology until the Year 2000: An Historical Overview

Otto S. Wolfbeis

Springer Series on Chemical Sensors and Biosensors > Optical Sensors > 1-34

This chapter reviews advances in the area of optical sensor technology using indicator probes and labels. It also presents an account of optical sensors based on the use of biomolecules and molecular receptors including molecular imprints. One may wonder why such progress has been made in the past 20 years. In the author’s opinion, this is due to several factors. These include the following: (a)...

chapter

Sol-gels and chemical sensors

Otto S. Wolfbeis, Renata Reisfeld, Ines Oehme

Structure and Bonding > Optical and Electronic Phenomena in Sol-Gel Glasses and Modern Application > 51-98

We review the principles of optical and electrochemical sensors based on the use of the sol-gel technique, in particular their fabrication, working principles, and various configurations. We also report on potential applications, e.g. to environmental and clinical analysis, to gas sensing, and to bioprocess monitoring. Methods are critically reviewed for making such sensors, how to encapsulate organic,...

chapter

Luminescent Chemical Sensing, Biosensing, and Screening Using Upconverting Nanoparticles

Daniela E. Achatz, Reham Ali, Otto S. Wolfbeis

Topics in Current Chemistry > Luminescence Applied in Sensor Science > 29-50

Upconverting nanoparticles (UCNPs) display the unique property of converting near-infrared light (with wavelengths of typically 800–1,000 nm) into visible luminescence. Following a short introduction into the mechanisms leading to the effect, the main classes of materials used are discussed. We then review the state of the art of using UCNPs: (1) to label biomolecules such as antibodies and (synthetic)...

book

Optical Sensors

Ramaier Narayanaswamy, Otto S. Wolfbeis

Springer Series on Chemical Sensors and Biosensors

Optical sensor technology has reached a level of technological maturity that makes it a promising candidate for applications to specific sensing challenges including those in environmental monitoring, in process control (particularly in biotechnology), in clinical assays were low-cost one-way sensing elements are needed, and in other areas. Optical sensors can be used as fiber optic microsensors,...

article

A Phytic Acid Induced Super‐Amphiphilic Multifunctional 3D Graphene‐Based Foam

Xinhong Song, Yiying Chen, Mingcong Rong, Zhaoxiong Xie, more

Angewandte Chemie International Edition > 55 > 12 > 3936 - 3941

Surfaces with super‐amphiphilicity have attracted tremendous interest for fundamental and applied research owing to their special affinity to both oil and water. It is generally believed that 3D graphenes are monoliths with strongly hydrophobic surfaces. Herein, we demonstrate the preparation of a 3D super‐amphiphilic (that is, highly hydrophilic and oleophilic) graphene‐based assembly in a single‐step...

article

A Phytic Acid Induced Super‐Amphiphilic Multifunctional 3D Graphene‐Based Foam

Xinhong Song, Yiying Chen, Mingcong Rong, Zhaoxiong Xie, more

Angewandte Chemie > 128 > 12 > 4004 - 4009

article

A water-sprayable, thermogelating and biocompatible polymer host for use in fluorescent chemical sensing and imaging of oxygen, pH values and temperature

Xu-dong Wang, Robert J. Meier, Carina Schmittlein, Stephan Schreml, more

Sensors and Actuators B: Chemical > 2015 > 221 > C > 37-44

We report on the use of a sprayable and thermogelating biomaterial (Poloxamer™; a.k.a. Pluronic™) in optical imaging of pH values, local oxygen and temperature. The material is highly biocompatible and easy to handle. We also show that the material is well permeable to oxygen (thus making it a good choice for use in oxygen sensors), and is stable in liquid solution and at elevated temperature. We...

article

Luminescent sensing and imaging of oxygen: Fierce competition to the Clark electrode

Otto S. Wolfbeis

BioEssays > 37 > 8 > 921 - 928

Luminescence‐based sensing schemes for oxygen have experienced a fast growth and are in the process of replacing the Clark electrode in many fields. Unlike electrodes, sensing is not limited to point measurements via fiber optic microsensors, but includes additional features such as planar sensing, imaging, and intracellular assays using nanosized sensor particles. In this essay, I review and discuss...

article

Nanomaterial-based electrochemical sensing of neurological drugs and neurotransmitters

Bankim J. Sanghavi, Otto S. Wolfbeis, Thomas Hirsch, Nathan S. Swami

Microchimica Acta > 2015 > 182 > 1-2 > 1-41

Nanomaterial-modified detection systems represent a chief driver towards the adoption of electrochemical methods, since nanomaterials enable functional tunability, ability to self-assemble, and novel electrical, optical and catalytic properties that emerge at this scale. This results in tremendous gains in terms of sensitivity, selectivity and versatility. We review the electrochemical methods and...

article

Targetable Phosphorescent Oxygen Nanosensors for the Assessment of Tumor Mitochondrial Dysfunction By Monitoring the Respiratory Activity

Xiao‐Hui Wang, Hong‐Shang Peng, Lin Yang, Fang‐Tian You, more

Angewandte Chemie > 126 > 46 > 12679 - 12683

Cellular respiration is a worthwhile criterion to evaluate mitochondrial dysfunction by measuring the dissolved oxygen. However, most of the existing sensing strategies merely report extracellular (ec‐) or intracellular (ic‐) O₂ rather than intramitochondrial (im‐) O₂. Herein we present a method to assess tumor mitochondrial dysfunction with three phosphorescent nanosensors, which respond to ec‐,...

article

Targetable Phosphorescent Oxygen Nanosensors for the Assessment of Tumor Mitochondrial Dysfunction By Monitoring the Respiratory Activity

Xiao‐Hui Wang, Hong‐Shang Peng, Lin Yang, Fang‐Tian You, more

Angewandte Chemie International Edition > 53 > 46 > 12471 - 12475

article

Photonische Kristalle für die Chemo‐ und Biosensorik

Christoph Fenzl, Thomas Hirsch, Otto S. Wolfbeis

Angewandte Chemie > 126 > 13 > 3384 - 3402

Dieser Aufsatz beschreibt die Funktionsweise photonischer Kristalle (PhCs) und deren Einsatz in der Sensorik chemischer und biochemischer Analyte. Ein besonderes Augenmerk liegt dabei auf den verwendeten Materialien. Die einzelnen Abschnitte beschreiben a) die Grundlagen natürlicher und synthetischer photonischer Nanoarchitekturen, b) die verschiedenen Arten photonischer Kristallstrukturen, c) Reflexion...

article

Photonic Crystals for Chemical Sensing and Biosensing

Christoph Fenzl, Thomas Hirsch, Otto S. Wolfbeis

Angewandte Chemie International Edition > 53 > 13 > 3318 - 3335

This Review covers photonic crystals (PhCs) and their use for sensing mainly chemical and biochemical parameters, with a particular focus on the materials applied. Specific sections are devoted to a) a lead‐in into natural and synthetic photonic nanoarchitectures, b) the various kinds of structures of PhCs, c) reflection and diffraction in PhCs, d) aspects of sensing based on mechanical, thermal,...

article

Direct formation of mesoporous upconverting core-shell nanoparticles for bioimaging of living cells

Lining Sun, Tao Liu, Yannan Qiu, Jinliang Liu, more

Microchimica Acta > 2014 > 181 > 7-8 > 775-781

We have developed a one-step method for the synthesis of mesoporous upconverting nanoparticles (MUCNs) of the type NaYF₄:Yb,Er@mSiO₂ in ammoniacal ethanol/water solution. The mesoporous silica is directly encapsulating the hydrophobic upconversion nanoparticles (UCNs) due to the presence of the template CTAB. Intense green emission (between 520 and 560 nm) and weaker red emission (between 630 and...

article

Tyrosine specific sequential labeling of proteins

Gergely B. Cserép, András Herner, Otto S. Wolfbeis, Péter Kele

Bioorganic & Medicinal Chemistry Letters > 2013 > 23 > 21 > 5776-5778

We report (a) on the synthesis of a long-wavelength fluorescent coumarin containing an allyloxy acetate moiety, (b) the synthesis of two linkers containing an allyloxy acetate and an alkyne or azide function, respectively, and (c) the selective modification human serum albumin by a sequential method involving Pd(II) catalyzed modification of the phenolic side chain of tyrosine residues with an alkyne...

article

Imaging of cellular oxygen via two-photon excitation of fluorescent sensor nanoparticles

Xu-dong Wang, Daniela E. Achatz, Christina Hupf, Michaela Sperber, more

Sensors & Actuators: B. Chemical > 2013 > 188 > Complete > 257-262

Polystyrene nanoparticles (PSNPs) with an average size of 85nm and loaded with an oxygen-quenchable luminescent ruthenium complex were used to sense and image oxygen inside cells following 2-photon excitation (2-PE). The ruthenium probe possesses a large two-photon absorption cross-section, and 2-PE is achieved by irradiation in the near infrared with commercially available fs-pulsed laser systems...

article

A Highly K⁺‐Selective Phenylaza‐[18]crown‐6‐Lariat‐Ether‐Based Fluoroionophore and Its Application in the Sensing of K⁺ Ions with an Optical Sensor Film and in Cells

Sandra Ast, Thomas Schwarze, Holger Müller, Aleksey Sukhanov, more

Chemistry – A European Journal > 19 > 44 > 14911 - 14917

Herein, we report the synthesis of two phenylaza‐[18]crown‐6 lariat ethers with a coumarin fluorophore (1 and 2) and we reveal that compound 1 is an excellent probe for K⁺ ions under simulated physiological conditions. The presence of a 2‐methoxyethoxy lariat group at the ortho position of the anilino moiety is crucial to the substantially increased stability of compounds 1 and 2 over their lariat‐free...

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SENSORS (15)
LUMINESCENCE (14)
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OXYGEN (8)
HYDROGEN PEROXIDE (6)
IMAGING (6)
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BIOTIN (4)
CLICK CHEMISTRY (4)
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FLUORESZENZ (4)
OXYGEN SENSOR (4)
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ION PAIRS (3)
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LUMINESCENT PROBES (3)
LUMINESZENZ (3)
NANOPARTICLE (3)
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TEMPERATURE SENSING (3)
TETRACYCLINE (3)
AFFINITY ASSAY (2)
BILDGEBUNGSVERFAHREN (2)
BIOCONJUGATION (2)
CALCIUM (2)
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DATING (2)
DNA (2)
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FLUORIMETRY (2)
GAS SENSOR (2)
GLUCOSE OXIDASE (2)
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IVORY (2)
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MICROSENSOR (2)
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NIR DYES (2)
OPTICAL OXYGEN SENSOR (2)
OPTICAL SENSING (2)
OPTODE (2)
OPTRODES (2)
PH (2)
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POLYANILINE FILM (2)
PORPHYRINS (2)
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14C (1)
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90SR (1)
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ADDRESSABLE IMMOBILIZATION (BIO)SENSOR ARRAY. (1)
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INFONA - science communication portal

Search results for: Otto S. Wolfbeis

A MXene‐Based Wearable Biosensor System for High‐Performance In Vitro Perspiration Analysis

Expression of Concern: Magnetic mesoporous polymelamine-formaldehyde resin as an adsorbent for endocrine disrupting chemicals

Europium-doped GdVO4 nanocrystals as a luminescent probe for hydrogen peroxide and for enzymatic sensing of glucose

Optical Technology until the Year 2000: An Historical Overview

Sol-gels and chemical sensors

Luminescent Chemical Sensing, Biosensing, and Screening Using Upconverting Nanoparticles

Optical Sensors

A Phytic Acid Induced Super‐Amphiphilic Multifunctional 3D Graphene‐Based Foam

A Phytic Acid Induced Super‐Amphiphilic Multifunctional 3D Graphene‐Based Foam

A water-sprayable, thermogelating and biocompatible polymer host for use in fluorescent chemical sensing and imaging of oxygen, pH values and temperature

Luminescent sensing and imaging of oxygen: Fierce competition to the Clark electrode

Nanomaterial-based electrochemical sensing of neurological drugs and neurotransmitters

Targetable Phosphorescent Oxygen Nanosensors for the Assessment of Tumor Mitochondrial Dysfunction By Monitoring the Respiratory Activity

Targetable Phosphorescent Oxygen Nanosensors for the Assessment of Tumor Mitochondrial Dysfunction By Monitoring the Respiratory Activity

Photonische Kristalle für die Chemo‐ und Biosensorik

Photonic Crystals for Chemical Sensing and Biosensing

Direct formation of mesoporous upconverting core-shell nanoparticles for bioimaging of living cells

Tyrosine specific sequential labeling of proteins

Imaging of cellular oxygen via two-photon excitation of fluorescent sensor nanoparticles

A Highly K⁺‐Selective Phenylaza‐[18]crown‐6‐Lariat‐Ether‐Based Fluoroionophore and Its Application in the Sensing of K⁺ Ions with an Optical Sensor Film and in Cells

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