Search results for: Ashok Mulchandani

Items from 1 to 20 out of 130 results

article

Electrochemical Biosensor for Rapid Detection of Viable Bacteria and Antibiotic Screening

Nuvia Maria Saucedo, Sira Srinives, Ashok Mulchandani

Journal of Analysis and Testing > 2019 > 3 > 1 > 117-122

We have developed a biosensor for the detection of live/viable bacteria based on the response of the conductive polymer 4-(3-pyrrolyl) butyric acid to glucose-induced metabolites. The polymer was electrochemically deposited and then functionalized with lectin through EDC/NHS chemistry to capture cells near the sensor surface and introduce selectivity for analytes. The addition of glucose to a three-electrode...

article

Tuning Coating Thickness of Iron Tetraphenyl Porphyrin on Single Walled Carbon Nanotubes by Annealing: Effect on Benzene Sensing Performance

Arti Rushi, Kunal Datta, Prasanta Ghosh, Ashok Mulchandani, more

physica status solidi (a) > 215 > 18 > n/a - n/a

The influence of post functionalization annealing in tuning the sensing properties of metalloporphyrin functionalized single walled carbon nanotubes (SWCNTs) based benzene sensors has been reported. Aligned SWCNTs framework is non‐covalently functionalized by iron tetraphenyl porphyrin (FeTPP), followed by a systematic investigation of the annealing effect(s) on the functionalized structures. Structural...

article

Single‐walled Carbon Nanotube‐Calixarene Based Chemiresistor for Volatile Organic Compounds

Tapan Sarkar, Sira Srinives, Armando Rodriquez, Ashok Mulchandani

Electroanalysis > 30 > 9 > 2077 - 2084

Calixarenes are exciting class of organic macromolecules and proved to be an excellent sensing material for optical and mass transaction based sensors. The limited conductivity of calixarenes is a major impediment for the development of calixarene‐only chemiresistive sensors. The authors report on a calixarene‐based chemiresistor that is based on a hybrid material obtained by non‐covalent functionalization...

article

Electro‐oxidized Monolayer CVD Graphene Film Transducer for Ultrasensitive Impedimetric DNA Biosensor

Ali Benvidi, Nuvia M. Saucedo, Pankaj Ramnani, Claudia Villarreal, more

Electroanalysis > 30 > 8 > 1791 - 1800

We report the effect of electrochemical anodization on the properties of monolayer graphene as the main aim of this research and consequently using the resulting label‐free impedimetric biosensor for DNA sequences detection. Monolayer graphene was grown by chemical vapor deposition (CVD) with methane as precursor on copper foil, transferred onto a glassy carbon electrode and electrochemically anodized...

article

Highly active spore biocatalyst by self‐assembly of co‐expressed anchoring scaffoldin and multimeric enzyme

Long Chen, Megan Holmes, Elise Schaefer, Ashok Mulchandani, more

Biotechnology and Bioengineering > 115 > 3 > 557 - 564

We report a spore‐based biocatalysis platform capable of producing and self‐assembling active multimeric enzymes on a spore surface with a high loading density. This was achieved by co‐expressing both a spore surface‐anchoring scaffoldin protein containing multiple cohesin domains and a dockerin‐tagged enzyme of interest in the mother cell compartment during Bacillus subtilis sporulation. Using this...

article

Raman spectra of twisted CVD bilayer graphene

Pankaj Ramnani, Mahesh R. Neupane, Supeng Ge, Alexander A. Balandin, more

Carbon > 2017 > 123 > C > 302-306

The Raman spectra of large-size, single-crystal, twisted bilayer graphene (tBLG) grains grown by chemical vapor deposition (CVD) are measured as a function of the rotation angle. The rotation angle between the graphene layers is determined using a combination of transmission electron microscopy (TEM) and selected area electron diffraction (SAED). The 2D and G peaks follow the same trends as found...

article

Cover Image, Volume 73, Issue 10

Jia‐Wei Tay, Mark S Hoddle, Ashok Mulchandani, Dong‐Hwan Choe

Pest Management Science > 73 > 10 > i - i

The cover image, by Jia‐Wei Tay et al., is based on the Research Article Development of an alginate hydrogel to deliver aqueous bait for pest ant management, DOI: 10.1002/ps.4616.

article

Development of an alginate hydrogel to deliver aqueous bait for pest ant management

Jia‐Wei Tay, Mark S Hoddle, Ashok Mulchandani, Dong‐Hwan Choe

Pest Management Science > 73 > 10 > 2028 - 2038

BACKGROUND Insecticide sprays used for ant control cause environmental contamination. Liquid bait is a safe and effective alternative, but it requires bait stations to dispense the toxicant. We developed a biodegradable hydrogel to deliver liquid bait obviating the need for bait stations. RESULTS Alginate hydrogel beads with preferred rigidity and maximum hydration in 25% sucrose solution were engineered...

article

Highly sensitive detection of Cr(VI) by reduced graphene oxide chemiresistor and 1,4-dithiothreitol functionalized Au nanoparticles

Feng Tan, Longchao Cong, Xiao Jiang, Yi Wang, more

Sensors and Actuators B: Chemical > 2017 > 247 > C > 265-272

Detection of highly toxic Cr(VI) is greatly desired. In the present study, a highly sensitive method for Cr(VI) detection by reduced graphene oxide (rGO) chemiresistor and 1,4-dithiothreitol (DTT) functionalized Au nanoparticles (AuNPs) is reported. The detection strategy is based on the selective binding between DTT functionalized AuNPs1 located in rGO conductive channels and DTT functionalized AuNPs2...

article

A heparin-functionalized carbon nanotube-based affinity biosensor for dengue virus

Daniel Wasik, Ashok Mulchandani, Marylynn V. Yates

Biosensors and Bioelectronics > 2017 > 91 > C > 811-816

Dengue virus is an arthropod-borne virus transmitted primarily by Aedes mosquitos and is major cause of disease in tropical and subtropical regions. Colloquially known as Dengue Fever, infection can cause hemorrhagic disorders and death in humans and non-human primates. We report a novel electronic biosensor based on a single-walled carbon nanotube network chemiresistive transducer that is functionalized...

article

Monitoring of microbial cell viability using nanostructured electrodes modified with Graphene/Alumina nanocomposite

Rabeay Y.A. Hassan, Moataz M. Mekawy, Pankaj Ramnani, Ashok Mulchandani

Biosensors and Bioelectronics > 2017 > 91 > C > 857-862

Microbial infections are rapidly increasing; however most of the existing microbiological and molecular detection methods are time consuming and/or cannot differentiate between the viable and dead cells which may overestimate the risk of infections. Therefore, a bioelectrochemical sensing platform with a high potential to the microbial-electrode interactions was designed based on decorated graphene...

article

Spore‐displayed enzyme cascade with tunable stoichiometry

Long Chen, Ashok Mulchandani, Xin Ge

Biotechnology Progress > 33 > 2 > 383 - 389

Taking the advantages of inert and stable nature of endospores, we developed a biocatalysis platform for multiple enzyme immobilization on Bacillus subtilis spore surface. Among B. subtilis outer coat proteins, CotG mediated a high expression level of Clostridium thermocellum cohesin (CtCoh) with a functional display capability of ∼10⁴ molecules per spore of xylose reductase‐C. thermocellum dockerin...

article

An electrochemically reduced graphene oxide chemiresistive sensor for sensitive detection of Hg2+ ion in water samples

Feng Tan, Longchao Cong, Nuvia Maria Saucedo, Jinsuo Gao, more

Journal of Hazardous Materials > 2016 > 320 > C > 226-233

Divalent mercuric (Hg²⁺) ion is one of the most prevalent forms of mercury species in waters with high toxicity and bioaccumulation in the human body, for which sensitive and selective detection methods are highly necessary to carry out its recognition and quantification. Here an electrochemically reduced graphene oxide (RGO) based chemiresistive sensor was constructed and used for the detection of...

article

Electrochemical properties of seamless three-dimensional carbon nanotubes-grown graphene modified with horseradish peroxidase

Kikuo Komori, Trupti Terse-Thakoor, Ashok Mulchandani

Bioelectrochemistry > 2016 > 111 > C > 57-61

Horseradish peroxidase (HRP) was immobilized through sodium dodecyl sulfate (SDS) on the surface of a seamless three-dimensional hybrid of carbon nanotubes grown at the graphene surface (HRP-SDS/CNTs/G) and its electrochemical properties were investigated. Compared with graphene alone electrode modified with HRP via SDS (HRP-SDS/G electrode), the surface coverage of electroactive HRP at the CNTs/G...

chapter

Engineering of Improved Biocatalysts in Bioremediation

Wilfred Chen, Ashok Mulchandani

Soil Biology > Biodegradation and Bioremediation > 235-250

Over the past few decades enormous quantities of industrial pollutants have been released into the environment. A large number of them, particularly those structurally related to natural compounds, are readily degraded or removed by microorganisms found in soil and water. However, superimposed on the rich variety of pollutants present in the environment are an increasing number of novel industrial...

article

Carbon nanotubes and graphene nano field-effect transistor-based biosensors

Thien-Toan Tran, Ashok Mulchandani

TrAC Trends in Analytical Chemistry > 2016 > 79 > C > 222-232

Graphene and carbon nanotubes (CNTs) have gained major research interests as signal transducing elements in electrical biosensors for applications in biosensing of a wide range of analytes. This is mostly due to the unique physical, chemical, and electrical properties of the carbon nanomaterials. This review discusses the integration and applications of these carbon allotropes into field-effect transistor-type...

article

Carbon nanomaterial-based electrochemical biosensors for label-free sensing of environmental pollutants

Pankaj Ramnani, Nuvia M. Saucedo, Ashok Mulchandani

Chemosphere > 2016 > 143 > C > 85-98

Carbon allotropes such as graphene and carbon nanotubes, have been incorporated in electrochemical biosensors for highly sensitive and selective detection of various analytes. The superior physical and electrical properties like high carrier mobility, ambipolar electric field effect, high surface area, flexibility and their compatibility with microfabrication techniques makes these carbon nanomaterials...

article

A miniature chemiresistor sensor for carbon dioxide

Sira Srinives, Tapan Sarkar, Raul Hernandez, Ashok Mulchandani

Analytica Chimica Acta > 2015 > 874 > Complete > 54-58

A carpet-like nanostructure of polyaniline (PANI) nanothin film functionalized with poly(ethyleneimine), PEI, was used as a miniature chemiresistor sensor for detection of CO ₂ at room temperature. Good sensing performance was observed upon exposing the PEI–PANI device to 50–5000ppm CO ₂ in presence of humidity with negligible interference from ammonia, carbon monoxide, methane and...

article

Pt nanoparticles-chemical vapor deposited graphene composite based immunosensor for the detection of human cardiac troponin I

Shobhita Singal, Avanish K. Srivastava, Ashok M. Biradar, Ashok Mulchandani, more

Sensors & Actuators: B. Chemical > 2014 > 205 > Complete > 363-370

We report a sensitive and stable electrochemical impedance immunosensor prepared with functionalized Pt nanoparticles decorated graphene monolayer deposited on a glassy carbon electrode (GCE). Graphene monolayer was grown on a copper foil by chemical vapor deposition (CVD) method using acetylene as a precursor source and transferred it on GCE and electrochemically oxidized to electroactive graphene...

article

Affinity chemiresistor sensor for sugars

Chaker Tlili, Sushmee Badhulika, Thien-Toan Tran, Ilkeun Lee, more

Talanta > 2014 > 128 > Complete > 473-479

In this work, a non-enzymatic chemiresistive sugar sensor has been developed by combining a synthetic receptor with aligned single-walled carbon nanotubes (SWNTs) device. Briefly, boronic acid as a multivalent sugar receptor was immobilized on carbon nanotubes through amide bond formation. The interaction between three common sugars (d-glucose, d-fructose and sucrose) and boronic acid modified SWNTs...

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CARBON NANOTUBES (10)
BIOSENSOR (9)
NERVE AGENTS (9)
ORGANOPHOSPHORUS HYDROLASE (9)
GRAPHENE (8)
CHEMIRESISTOR (7)
GAS SENSOR (6)
CONDUCTING POLYMER (4)
FIELD-EFFECT TRANSISTOR (4)
NANOPARTICLES (4)
ORGANOPHOSPHATE (4)
PESTICIDES (4)
AMPEROMETRIC (3)
BIOSENSORS (3)
CHEMICAL VAPOR DEPOSITION (3)
ELECTRODEPOSITION (3)
ENZYME ELECTRODE (3)
HYDROGEN SULFIDE (3)
IMMUNOSENSOR (3)
MICROBIAL BIOSENSOR (3)
MORAXELLA SP. (3)
PATHOGEN (3)
SENSORS (3)
PSEUDOMONAS PUTIDA (2)
AMMONIA (2)
AQUACULTURE (2)
BIOREMEDIATION (2)
CARBON NANOTUBE (2)
CHEMIRESISTIVE SENSOR (2)
CONDUCTING POLYMERS (2)
ELASTIN (2)
ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY (2)
ESCHERICHIA COLI (2)
EXPLOSIVES (2)
FIELD EFFECT TRANSISTOR (2)
GAS SENSORS (2)
GRAPHENE OXIDE (2)
HEAVY METALS (2)
LABEL-FREE (2)
LABEL-FREE BIOSENSOR (2)
MERCURY (2)
NANOBIOSENSOR (2)
NANOCOMPOSITE (2)
OPH (2)
ORGANOPHOSPHATES (2)
ORGANOPHOSPHOROUS HYDROLASE (2)
P-NITROPHENOL (2)
PHYTOCHELATINS (2)
POLYANILINE (2)
POLYPYRROLE (2)
POTENTIOMETRIC (2)
REDUCED GRAPHENE OXIDE (2)
SPORE SURFACE DISPLAY (2)
SWCNTS (2)
VIRAL DETECTION (2)
SPHINGOBIUM JAPONICUM UT26 (1)
1-D NANOSTRUCTURES (1)
ACETYLCHOLINE ESTERASE (1)
ADC (1)
ADSORPTION (1)
ALIGNMENT (1)
ALUMINUM OXIDE (1)
AMELOGENIN GENE (1)
AMINES (1)
AMPEROMETRIC BIOSENSOR (1)
ANALOG FRONT END (1)
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ANODIZATION (1)
ANT CONTROL (1)
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APTAMERS (1)
ARGENTINE ANT (1)
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ARSENIC, LEAD (1)
AS(V) (1)
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AU NANOPARTICLES (1)
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BACTERIOPHAGE (1)
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INFONA - science communication portal

Search results for: Ashok Mulchandani

Electrochemical Biosensor for Rapid Detection of Viable Bacteria and Antibiotic Screening

Tuning Coating Thickness of Iron Tetraphenyl Porphyrin on Single Walled Carbon Nanotubes by Annealing: Effect on Benzene Sensing Performance

Single‐walled Carbon Nanotube‐Calixarene Based Chemiresistor for Volatile Organic Compounds

Electro‐oxidized Monolayer CVD Graphene Film Transducer for Ultrasensitive Impedimetric DNA Biosensor

Highly active spore biocatalyst by self‐assembly of co‐expressed anchoring scaffoldin and multimeric enzyme

Raman spectra of twisted CVD bilayer graphene

Cover Image, Volume 73, Issue 10

Development of an alginate hydrogel to deliver aqueous bait for pest ant management

Highly sensitive detection of Cr(VI) by reduced graphene oxide chemiresistor and 1,4-dithiothreitol functionalized Au nanoparticles

A heparin-functionalized carbon nanotube-based affinity biosensor for dengue virus

Monitoring of microbial cell viability using nanostructured electrodes modified with Graphene/Alumina nanocomposite

Spore‐displayed enzyme cascade with tunable stoichiometry

An electrochemically reduced graphene oxide chemiresistive sensor for sensitive detection of Hg2+ ion in water samples

Electrochemical properties of seamless three-dimensional carbon nanotubes-grown graphene modified with horseradish peroxidase

Engineering of Improved Biocatalysts in Bioremediation

Carbon nanotubes and graphene nano field-effect transistor-based biosensors

Carbon nanomaterial-based electrochemical biosensors for label-free sensing of environmental pollutants

A miniature chemiresistor sensor for carbon dioxide

Pt nanoparticles-chemical vapor deposited graphene composite based immunosensor for the detection of human cardiac troponin I

Affinity chemiresistor sensor for sugars

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