U.S. flag

An official website of the United States government

PubAg

Main content area

Search

89  Search Results

« Previous | 1 - 20 of 89 |
Number of results to display per page

Search Results

1. A colorimetric immunoassay based on glucose oxidase-induced AuNP aggregation for the detection of fumonisin B1

Author:
Chen, Xirui; Liang, Yi; Zhang, Wenjing; Leng, Yuankui; Xiong, Yonghua
Source:
Talanta 2018 v.186 pp. 29-35
ISSN:
0039-9140
Subject:
antigens; color; colorimetry; corn; diagnostic techniques; enzyme-linked immunosorbent assay; food contamination; fumonisin B1; glucose; glucose oxidase; hydrogen peroxide; nanogold; oxidation; peroxidase; point-of-care systems; screening; ultra-performance liquid chromatography
Abstract:
... Naked-eye readout colorimetric signal-based assays are promising for high-throughput screening detection and point-of-care diagnostics in resource-constrained regions. Here, a novel direct competitive plasmonic enzyme-linked immunosorbent assay (dc-pELISA) based on gold nanoparticle (AuNP) aggregation with highly sensitive and robust naked-eye readout signal was developed and used to detect fumoni ...
DOI:
10.1016/j.talanta.2018.04.018

2. A comparative study of sterically and electro-statically stabilized silver nanoparticles for the determination of muscle relaxant tizanidine: Insights of localized surface plasmon resonance, surface enhanced Raman spectroscopy and electrocatalytic activity

Author:
El-Zahry, Marwa R.
Source:
Talanta 2018 v.186 pp. 229-237
ISSN:
0039-9140
Subject:
Raman spectroscopy; ambient temperature; ascorbic acid; chemistry; dielectric spectroscopy; glassy carbon electrode; guidelines; muscle relaxants; nanosilver; polyethylene glycol; quantitative analysis; reducing agents; stabilizers; surface plasmon resonance; transmission electron microscopes; ultraviolet-visible spectroscopy
Abstract:
... A comparative study of two types of silver nanoparticles was investigated. The effect of the surface chemistry of the studied silver nanoparticles (AgNPs) on their localized surface plasmon resonance was utilized for the quantitative determination of muscle relaxant tizanidine drug. The studied AgNPs are classified according to the type of stabilizing agent used in their synthesis into electrostat ...
DOI:
10.1016/j.talanta.2018.04.039

3. A label-free electrochemiluminescent immunosensor for glutamate decarboxylase antibody detection on AuNPs supporting interface

Author:
Ma, Xuexue; Fang, Chen; Yan, Jilin; Zhao, Qun; Tu, Yifeng
Source:
Talanta 2018 v.186 pp. 206-214
ISSN:
0039-9140
Subject:
adults; antibodies; antibody detection; coatings; electrodes; gels; glass; glutamate decarboxylase; gold; humans; hydrolysis; immunosensors; indium tin oxide; insulin-dependent diabetes mellitus; nanogold; polymers; regression analysis
Abstract:
... In this paper, we will describe a novel lable-free electrochemiluminescent (ECL) immunosensor for the detection of glutamate decarboxylase antibody (GADA) in which Au nanoparticles (AuNPs) had pre-functionalized the indium tin oxide (ITO) glass to support the sensing interface. The preparation of the basal electrode only need a simple two-step drop coating, a thin polymer of hydrolyzed 3-aminoprop ...
DOI:
10.1016/j.talanta.2018.04.052

4. Alpha fetoprotein assessment by using a nano optical sensor thin film binuclear Pt-2-aminobenzimidazole-Bipyridine for early diagnosis of liver cancer

Author:
Attia, M.S.; Youssef, A.O.; Khan, Ziya A.; Abou-Omar, M.N.
Source:
Talanta 2018 v.186 pp. 36-43
ISSN:
0039-9140
Subject:
blood serum; calibration; early diagnosis; gels; liver; neoplasms; patients; viruses
Abstract:
... A simple, precise and sensitive method in which, a nano optical sensor binuclear Pt-2-aminobenzimidazole-bipyridine, Pt(abi)(bpy) complex doped in sol gel is used for the early diagnosis of liver cancer. The idea depends on the assessment of the concentration of alpha fetoprotein (AFP) in the serum samples of different liver patients. The nano binuclear Pt(abi)(bpy) has strong emission spectrum up ...
DOI:
10.1016/j.talanta.2018.04.043

5. A novel bioassay based on aptamer-functionalized magnetic nanoparticle for the detection of zearalenone using time resolved-fluorescence NaYF4: Ce/Tb nanoparticles as signal probe

Author:
Niazi, Sobia; Wang, Xiaole; Pasha, Imran; Khan, Imran Mahmood; Zhao, Sen; Shoaib, Muhammad; Wu, Shijia; Wang, Zhouping
Source:
Talanta 2018 v.186 pp. 97-103
ISSN:
0039-9140
Subject:
aflatoxin B2; antibodies; bioassays; complementary DNA; corn; detection limit; equipment; fluorescence; fungi; magnetism; nanoparticles; oligonucleotides; patulin; stored grain; temperature; wheat; zearalenone
Abstract:
... Zearalenone (ZEN) is a non-steroidal estrogenic mycotoxin produced by fungi on stored grains. The earlier detection methods used for ZEN rely on expensive equipment, time-consuming sample preparation and temperature sensitive antibodies. The current work, proposed a novel strategy based on ZEN aptamer labeled with amine-functionalized magnetic nanoparticle (MNPs) as a capture probe and time-resolv ...
DOI:
10.1016/j.talanta.2018.04.013

6. A novel sample preparation procedure for effect-directed analysis of micro-contaminants of emerging concern in surface waters

Author:
Osorio, Victoria; Schriks, Merijn; Vughs, Dennis; de Voogt, Pim; Kolkman, Annemieke
Source:
Talanta 2018 v.186 pp. 527-537
ISSN:
0039-9140
Subject:
bioassays; detection limit; hazard characterization; hormone antagonists; liquid chromatography; mutagens; oxidative stress; quantitative analysis; solid phase extraction; sorbents; surface water; tandem mass spectrometry; toxicity testing; water supply
Abstract:
... A novel sample preparation procedure relying on Solid Phase Extraction (SPE) combining different sorbent materials on a sequential-based cartridge was optimized and validated for the enrichment of 117 widely diverse contaminants of emerging concern (CECs) from surface waters (SW) and further combined chemical and biological analysis on subsequent extracts. A liquid chromatography coupled to high r ...
DOI:
10.1016/j.talanta.2018.04.058

7. An ultrasensitive electrochemiluminescence immunosensor based on platinum nickel nanocubes-L-cysteine-luminol nanocomposite

Author:
Wang, Yinfang; Sha, Haifeng; Ke, Hong; Jia, Nengqin
Source:
Talanta 2018 v.186 pp. 322-329
ISSN:
0039-9140
Subject:
antibodies; antigens; blood serum; chitosan; electrochemiluminescence; free radicals; glassy carbon electrode; hydrogen peroxide; immunosensors; nanocomposites; nickel; platinum
Abstract:
... An ultrasensitive electrochemiluminescence (ECL) immunosensor was initially developed for quantitative detection of carbohydrate antigen 15-3 (CA15-3) using platinum nickel nanocubes-L-cysteine-luminol nanocomposite (PtNi NCs-L-Cys-luminol) as signal probe. Herein, the PtNi NCs-L-Cys-luminol nanocomposite was modified on the glassy carbon electrode (GCE) surface via the film-forming properties of ...
DOI:
10.1016/j.talanta.2018.04.069

8. An ultrasensitive label-free colorimetric assay for glutathione based on Ag+ regulated autocatalytic oxidation of o-phenylenediamine

Author:
Li, Fang; Liu, Jiachang; Hu, Yuting; Deng, Ning; He, Jianbo
Source:
Talanta 2018 v.186 pp. 330-336
ISSN:
0039-9140
Subject:
absorbance; bioassays; color; colorimetry; cost effectiveness; cysteine; detection limit; glutathione; homocysteine; ions; moieties; nanosilver; oxidation; silver; urine
Abstract:
... The discriminative determination of glutathione (GSH) over cysteine (Cys) and homocysteine (Hcy) is still challenging in bioassays due to their similar functional groups. Herein, a novel, simple, rapid, sensitive and cost-effective label-free colorimetric method for the selective determination of GSH over Cys and Hcy was proposed. In this assay, firstly, o-phenylenediamine (OPD) could be oxidized ...
DOI:
10.1016/j.talanta.2018.04.078

9. Application of gradient ratio flow-injection technique to implementation of the Chemical H-point Standard Addition Method

Author:
Wieczorek, Marcin; Dębosz, Marek; Świt, Paweł; Woźniakiewicz, Aneta; Kościelniak, Paweł
Source:
Talanta 2018 v.186 pp. 215-220
ISSN:
0039-9140
Subject:
absorbance; acetaminophen; ascorbic acid; capillary electrophoresis; confidence interval; flow injection analysis; iron; juices; sodium hydroxide; sodium nitrite; soft drinks
Abstract:
... A new gradient ratio approach to Chemical H-point Standard Addition Method (C-HPSAM) was developed in flow injection analysis with spectrophotometric detection. C-HPSAM is based on an idea to use SAM for calibration in several different chemical conditions in order to correct unspecific (additive) interferences in samples with unknown matrix. The approach proposed in this paper employs the gradien ...
DOI:
10.1016/j.talanta.2018.03.096

10. A ricin forensic profiling approach based on a complex set of biomarkers

Author:
Fredriksson, Sten-Åke; Wunschel, David S.; Lindström, Susanne Wiklund; Nilsson, Calle; Wahl, Karen; Åstot, Crister
Source:
Talanta 2018 v.186 pp. 628-635
ISSN:
0039-9140
Subject:
Ricinus communis; agglutinins; analytical methods; biomarkers; carbohydrates; castor beans; cultivars; decision support systems; fatty acids; forensic sciences; models; prediction; ricin; seed storage proteins; statistics
Abstract:
... A forensic method for the retrospective determination of preparation methods used for illicit ricin toxin production was developed. The method was based on a complex set of biomarkers, including carbohydrates, fatty acids, seed storage proteins, in combination with data on ricin and Ricinus communis agglutinin. The analyses were performed on samples prepared from four castor bean plant (R. communi ...
DOI:
10.1016/j.talanta.2018.03.070

11. A sensitive, colorimetric immunosensor based on Cu-MOFs and HRP for detection of dibutyl phthalate in environmental and food samples

Author:
Zhu, Nuanfei; Zou, Yanmin; Huang, Menglu; Dong, Shuaibing; Wu, Xiangyang; Liang, Guoxi; Han, Zhixiang; Zhang, Zhen
Source:
Talanta 2018 v.186 pp. 104-109
ISSN:
0039-9140
Subject:
antibodies; ascorbic acid; colorimetry; coordination polymers; copper; detection limit; dibutyl phthalate; enzyme-linked immunosorbent assay; immunosensors; nitric acid; oxidation; peroxidase
Abstract:
... A sensitive and artful colorimetric immunosensor based on horseradish peroxidase (HRP) was designed by labelling metal–organic frameworks (Cu-MOFs) on the second antibody (Cu-MOFs@Ab₂) as signal amplification for the detection of trace dibutyl phthalate (DBP). In this system, when Cu-MOFs@Ab₂ was captured by antigen- primary antibody (Ab₁) complex, tremendous Cu(II) will be released from Cu-MOFs i ...
DOI:
10.1016/j.talanta.2018.04.023

12. A sensitively non-enzymatic amperometric sensor and its application in living cell superoxide anion radical detection

Author:
Liu, Xinhe; Ran, Miaomiao; Liu, Guoan; Liu, Xiuhui; Xue, Zhonghua; Lu, Xiaoquan
Source:
Talanta 2018 v.186 pp. 248-255
ISSN:
0039-9140
Subject:
X-ray diffraction; carbon nanotubes; chemical reduction; electrochemistry; energy-dispersive X-ray analysis; glassy carbon electrode; glucose; nanocomposites; nanosilver; oxidative stress; scanning electron microscopy; sensors (equipment); silver nitrate; spectrometers; stabilizers; superoxide anion
Abstract:
... Here, we report a nanocomposite composed of silver nanoparticles and multi-walled carbon nanotubes (AgNPs/MWNTs) utilized as an efficient electrode material for sensitive detection superoxide anion (O₂•⁻). The procedure to synthesize AgNPs/MWNTs nanocomposites was green and facile. In the presence of functionalized multi-wall carbon nanotubes (MWNTs), silver nanoparticles (AgNPs) were in situ gene ...
DOI:
10.1016/j.talanta.2018.04.067

13. Calcium-selective electrodes based on photo-cured polyurethane-acrylate membranes covalently attached to methacrylate functionalized poly(3,4-ethylenedioxythiophene) as solid-contact

Author:
Ocaña, Cristina; Abramova, Natalia; Bratov, Andrey; Lindfors, Tom; Bobacka, Johan
Source:
Talanta 2018 v.186 pp. 279-285
ISSN:
0039-9140
Subject:
carbon dioxide; carbon nanotubes; carboxylation; chemical bonding; dielectric spectroscopy; electrodes; oxygen; photochemical reactions; polymerization; polyurethanes; transducers (equipment)
Abstract:
... We report here the fabrication of solid-contact calcium-selective electrodes (Ca²⁺-SCISEs) made of a polyurethane acrylate ion-selective membrane (ISM) that was covalently attached to the underlying ion-to-electron transducer (solid-contact). Methacrylate-functionalized poly(3,4-ethylenedioxythiophene) (Meth-PEDOT) and Meth-PEDOT films containing either multiwalled carbon nanotubes (MWCNT) or carb ...
DOI:
10.1016/j.talanta.2018.04.056

14. Comparison of Chelex based resins in diffusive gradients in thin-film for high resolution assessment of metals

Author:
Zhou, Chunyang; van de Velde, Sebastiaan; Baeyens, Willy; Gao, Yue
Source:
Talanta 2018 v.186 pp. 397-405
ISSN:
0039-9140
Subject:
adsorption; binding capacity; cadmium; copper; gels; grinding; image analysis; iron; manganese; marine sediments; resins; sampling; soil
Abstract:
... The passive sampling technique of diffusive gradients in thin-film (DGT) is widely used to determine 1D profiles (using Chelex-100 resin) and 2D images (using suspended particulate reagent-iminodiacetate resin, abbreviated as SPR-IDA resin) of metals in sediment pore waters and in oxic/anoxic soils. However, when deployed in anoxic sediments with high metal concentrations, Fe and Mn concentrations ...
DOI:
10.1016/j.talanta.2018.04.085

15. Determination of cadmium in sediments by diluted HCI extraction and isotope dilution ICP-MS

Author:
Terán-Baamonde, Javier; Soto-Ferreiro, Rosa-María; Carlosena, Alatzne; Andrade, José-Manuel; Prada, Darío
Source:
Talanta 2018 v.186 pp. 272-278
ISSN:
0039-9140
Subject:
agitation; cadmium; computer software; estuaries; hydrochloric acid; isotope dilution technique; isotopes; marine sediments; solubilization; ultrasonics; uncertainty; Spain
Abstract:
... Isotope dilution ICP-MS is proposed to measure the mass fraction of Cd extracted by diluted HCl in marine sediments, using a fast and simple extraction procedure based on ultrasonic probe agitation. The ¹¹¹Cd isotope was added before the extraction to achieve isotope equilibration with native Cd solubilized from the sample. The parameters affecting trueness and precision of isotope ratio measureme ...
DOI:
10.1016/j.talanta.2018.04.054

16. Determination of C-reactive protein by PAMAM decorated ITO based disposable biosensing system: A new immunosensor design from an old molecule

Author:
Sonuç Karaboğa, Münteha Nur; Sezgintürk, Mustafa Kemal
Source:
Talanta 2018 v.186 pp. 162-168
ISSN:
0039-9140
Subject:
C-reactive protein; antibodies; blood serum; chemical bonding; dendrimers; detection limit; dielectric spectroscopy; electrochemistry; humans; immunosensors; indium tin oxide; inflammation; storage quality
Abstract:
... This paper demonstrates a new and sensitive electrochemical immunosensor for the analysis of C-reactive protein, an important marker of inflammation. Indium Tin Oxide (ITO) disposable sheets were modified by using 11-cyanoundecyltrimethoxysilane (CUTMS) and PAMAM dendrimers (G:1 amino surfaces) for the first time to immobilize the anti-CRP antibody via covalent interactions. Cyclic voltammetry (CV ...
DOI:
10.1016/j.talanta.2018.04.051

17. Development a hydrazide-functionalized thermosensitive polymer based homogeneous system for highly efficient N-glycoprotein/glycopeptide enrichment from human plasma exosome

Author:
Bai, Haihong; Pan, Yiting; Qi, Lu; Liu, Long; Zhao, Xinyuan; Dong, Hangyan; Cheng, Xiaoqiang; Qin, Weijie; Wang, Xinghe
Source:
Talanta 2018 v.186 pp. 513-520
ISSN:
0039-9140
Subject:
biomarkers; disease diagnosis; exosomes; glioma; glycoproteins; glycosylation; humans; hydrazides; mass spectrometry; mass transfer; moieties; patients; polymers; temperature; thermosensitivity
Abstract:
... As one of the most common post-translational modifications, protein N-glycosylation precipitates in many important biological processes and has closely correlations with the occurrence and progression of multiple diseases. Plasma exosomes secreted by cells contain various bioactive N-glycoproteins which may serve as potential biomarkers for early disease diagnosis and treatment. However, the prote ...
DOI:
10.1016/j.talanta.2018.04.098

18. Development of a method for the elemental analysis of milk powders using laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) and its potential use in geographic sourcing

Author:
Hoffman, Tricia; Jaćimović, Radojko; Bay, Lian Jie; Griboff, Julieta; Jagodic, Marta; Monferrán, Magdalena; Ogrinc, Nives; Podkolzin, Ivan; Wunderlin, Daniel; Almirall, Jose
Source:
Talanta 2018 v.186 pp. 670-677
ISSN:
0039-9140
Subject:
adulterated products; calcium; confidence interval; detection limit; dried milk; geographical distribution; magnesium; milk; neutron activation analysis; principal component analysis; rubidium; sodium; spectroscopy; strontium; Argentina; Russia; Singapore; Slovenia; United States
Abstract:
... Milk has been reported as one of the most adulterated foodstuffs in the developed and developing world. One way to detect adulteration is to determine whether the country of origin on the label could be the actual country of origin. Such profiling may be accomplished through the use of elemental analysis techniques, however this is a preliminary study and this goal is not yet met. In this study, a ...
DOI:
10.1016/j.talanta.2018.04.040

19. Development of a SERS strategy to overcome the nanoparticle stabilisation effect in serum-containing samples: Application to the quantification of dopamine in the culture medium of PC-12 cells

Author:
Dumont, E.; De Bleye, C.; Cailletaud, J.; Sacré, P.-Y.; Van Lerberghe, P.-B.; Rogister, B.; Rance, G.A.; Aylott, J.W.; Hubert, Ph.; Ziemons, E.
Source:
Talanta 2018 v.186 pp. 8-16
ISSN:
0039-9140
Subject:
Raman spectroscopy; antibodies; biosynthesis; blood serum; calcium; colloids; culture media; dexamethasone; dopamine; exocytosis; models; nanogold; nanoparticles; neurotransmitters; oligonucleotides; potassium; proteins
Abstract:
... The analysis of serum samples by surface-enhanced Raman spectroscopy (SERS) has gained ground over the last few years. However, the stabilisation of colloids by the proteins contained in these samples has restricted their use in common practice, unless antibodies or aptamers are used. Therefore, this work was dedicated to the development of a SERS methodology allowing the analysis of serum samples ...
DOI:
10.1016/j.talanta.2018.04.038

20. Development of dried serum spot sampling techniques for the assessment of trace elements in serum samples by LA-ICP-MS

Author:
Chantada-Vázquez, María Pilar; Moreda–Piñeiro, Jorge; Cantarero–Roldán, Alicia; Bermejo-Barrera, Pilar; Moreda-Piñeiro, Antonio
Source:
Talanta 2018 v.186 pp. 169-175
ISSN:
0039-9140
Subject:
acetic acid; adults; aluminum; blood chemistry; blood serum; calcium; carbon; chemical analysis; copper; formic acid; iron; lithium; magnesium; manganese; mass spectrometry; molybdenum; oxidants; potassium; reference standards; rubidium; sampling; sodium; sodium azide; sodium chlorate; stable isotopes; vanadium; wavelengths; zinc
Abstract:
... A novel approach for serum analysis by dried matrix spot (DMS) technique is proposed. The methodology consists of sampling filter paper discs (2.7 mm in diameter) containing the large amount of serum retained after a single spotting. Several oxidizers (sodium chlorate, sodium azide, acetic acid, formic acid, 1-butyl-3-methylimidazoliumm chloride/bromide) were tested (oxidizers premixed with the sa ...
DOI:
10.1016/j.talanta.2018.04.049