15 results match your criteria Analytical Letters[Journal]

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Voltammetric Application of Polypyrrole-Modified Microelectrode Array for the Characterization of DNA Methylation in Glutathione S-Transferase Pi 1.

Anal Lett 2018 28;51(16):2612-2625. Epub 2018 Mar 28.

Department of Chemistry and Forensic Science, Albany State University, Albany, Georgia 31705.

Direct and efficient label-free voltammetric detection of Glutathione S-Transferase Pi 1 (GSTP1) hypermethylation is reported using a custom developed 16-channel Microelectrode Array chip. The microelectrode array chip is used in a dipstick configuration allowing detection of DNA hybridization in a solution volume of only 0.35 mL. Read More

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https://www.tandfonline.com/doi/full/10.1080/00032719.2018.1
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http://dx.doi.org/10.1080/00032719.2018.1437623DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6146388PMC
March 2018
1 Read

A Robust Analytical Approach for the Identification of Specific Protein Carbonylation Sites: Metal-Catalyzed Oxidations of Human Serum Albumin.

Anal Lett 2017 24;50(3):567-579. Epub 2016 May 24.

Department of Chemistry, Virginia Commonwealth University, Richmond, VA 23284 USA.

The formation of protein carbonyls in the metal-catalyzed oxidation of human serum albumin (HSA) is characterized using a new analytical approach that involves tagging the modification site with multiple hydrazide reagents. Protein carbonyl formation at lysine and arginine residues was catalyzed with copper and iron ions, and the resulting oxidation patterns in HSA are contrasted. A total of 18 modification sites were identified with iron ion catalysis and 14 with copper ion catalysis. Read More

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https://www.tandfonline.com/doi/full/10.1080/00032719.2016.1
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http://dx.doi.org/10.1080/00032719.2016.1186171DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5347518PMC
May 2016
2 Reads

Novel Imprinted Polymer for the Preconcentration of Cadmium with Determination by Inductively Coupled Plasma Mass Spectrometry.

Anal Lett 2017 24;50(3):482-499. Epub 2016 May 24.

Department of Chemistry and Biochemistry, Jackson State University, Jackson, MS, USA.

A novel Cd(II)-imprinted polymer was prepared with chemical immobilization approach by using N-methacryloyl-L-histidine as a vinylated chelating agent for on-line solid phase extraction of Cd(II) for determination by inductively coupled plasma mass spectrometry. Cd(II)-monomer complex was synthesized and copolymerized via bulk polymerization method in the presence of ethyleneglycoldimethacrylate cross-linker. The resulting polymer was leached with 1. Read More

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http://dx.doi.org/10.1080/00032719.2016.1182544DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5320869PMC
May 2016
11 Reads

Characterization of Zinc Carbonate Basic as a Source of Zinc in a Rodent Study Investigating the Effects of Dietary Deficiency or Excess.

Anal Lett 2017 22;50(15):2447-2464. Epub 2017 Jun 22.

Division of the National Toxicology Program, National Institute of Environmental Health Sciences, MD EC-06, P.O. Box 12233, 111 T.W. Alexander Drive, Research Triangle Park, NC, 27709, USA.

Zinc deficiency and excess can result in adverse health outcomes. There is conflicting evidence regarding whether excess or deficient zinc in the diet can contribute to carcinogenicity. The objective of this study was to characterize zinc carbonate basic for use as a source of dietary zinc in a rodent toxicity and carcinogenicity study investigating the effects of zinc deficiency and excess. Read More

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http://dx.doi.org/10.1080/00032719.2017.1293073DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6440544PMC
June 2017
1 Read

VARIABLE SELECTION AND BIOMARKER CORRELATION IN THE ANALYSIS OF STRAINS BY SURFACE-ENHANCED RAMAN SPECTROSCOPY.

Anal Lett 2017 12;50(15):2412-2425. Epub 2017 Sep 12.

Department of Chemistry, University of Alabama at Birmingham, Birmingham, AL, USA.

is a human respiratory tract pathogen causing chronic bronchitis and atypical or "walking" pneumonia. The major surface protein P1 must form complexes with proteins P30 and P40/P90 in order to function in receptor binding and gliding motility, and variability in P1 and P40/P90 distinguishes the two major genotypes. Strains belonging to each genotype can be differentiated with high sensitivity and specificity by utilizing surface-enhanced Raman spectroscopy on silver nanorod arrays. Read More

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http://dx.doi.org/10.1080/00032719.2017.1287713DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6424499PMC
September 2017
1 Read

Voltammetric Determination of Dinonyl Diphenylamine and Butylated Hydroxytoluene in Mineral and Synthetic Oil.

Anal Lett 2016 Jul 22;49(10):1526-1536. Epub 2016 Feb 22.

Wuhan Research Institute of Materials Protection, State Key Laboratory of Special Surface Protection Materials and Application Technology , Wuhan , Hubei , China.

A method is reported for the determination of diphenylamine and butylated hydroxytoluene in mineral and synthetic oil. The procedure used differential pulse voltammetry with a glassy carbon electrode. This method was then used for determining these antioxidants in supporting electrolyte consisting of dilute sulfuric acid and sodium dodecyl sulfonate in ethanol. Read More

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http://dx.doi.org/10.1080/00032719.2015.1118484DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4917899PMC
July 2016
12 Reads

Determination of Carboxypeptidase Activity in Clinical Pathogens by Gas Chromatography-Mass Spectrometry.

Anal Lett 2016 May 21;49(8):1272-1277. Epub 2016 Apr 21.

Department of Applied Sciences, Northumbria University , Newcastle upon Tyne , UK.

A novel method for the determination of benzoic acid has been employed to identify carboxypeptidase activities in clinically relevant pathogens. Benzoic acid was determined after chemical derivatization by gas chromatography-mass spectrometry (GC-MS). N-Benzoyl amino acid substrates were evaluated for the detection of carboxypeptidase activities in a number of clinical pathogens. Read More

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http://dx.doi.org/10.1080/00032719.2015.1092153DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4867780PMC
May 2016
6 Reads

DIFFERENTIATION OF AND BY FLOW-INJECTION WITH ULTRAVIOLET SPECTROSCOPIC DETECTION AND PROTON NUCLEAR MAGNETIC RESONANCE USING PARTIAL LEAST-SQUARES DISCRIMINANT ANALYSIS.

Anal Lett 2016 Mar 8;49(5):711-722. Epub 2015 Jun 8.

Food Composition and Methods Development Lab, Beltsville Human Nutrition Research Center, Agricultural Research Service, United States Department of Agriculture, Beltsville, Maryland, 20705-2350, United States.

Two simple fingerprinting methods, flow-injection coupled to ultraviolet spectroscopy and proton nuclear magnetic resonance, were used for discriminating between and . Both methods were combined with partial least-squares discriminant analysis. In the flow-injection method, four data representations were evaluated: total ultraviolet absorbance chromatograms, averaged ultraviolet spectra, absorbance at 193, 205, 225, and 283 nm, and absorbance at 225 and 283 nm. Read More

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http://dx.doi.org/10.1080/00032719.2015.1045588DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4801347PMC
March 2016
4 Reads

RECENT DEVELOPMENTS IN ELECTROCHEMICAL SENSORS FOR THE DETECTION OF NEUROTRANSMITTERS FOR APPLICATIONS IN BIOMEDICINE.

Anal Lett 2015 May 31;48(7):1044-1069. Epub 2014 Dec 31.

Department of Chemistry and Biomolecular Science, Clarkson University, Potsdam, NY, USA. ; Tel: 3152682394.

Neurotransmitters are important biological molecules that are essential to many neurophysiological processes including memory, cognition, and behavioral states. The development of analytical methodologies to accurately detect neurotransmitters is of great importance in neurological and biological research. Specifically designed microelectrodes or microbiosensors have demonstrated potential for rapid, real-time measurements with high spatial resolution. Read More

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http://dx.doi.org/10.1080/00032719.2014.976867DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4787221PMC
May 2015
10 Reads

SPECTROSCOPIC AND ELECTROCHEMICAL CHARACTERIZATION OF IRON(II) AND 2,4-DINITROTOLUENE.

Anal Lett 2015;48(15):2482-2492. Epub 2015 May 5.

Department of Natural and Forensic Sciences, Albany State University, Albany, Georgia, USA.

The objective of this work was the development of reliable methods to determine 2,4-dinitrotoluene, a precursor to explosives. A complex between Fe(II) ion and 2,4-dinitrotoluene was formed in solution and characterized by ultraviolet-visible absorption spectroscopy using Job's plots and attenuated total reflection-Fourier transform infrared spectroscopy. Surface modification of glassy carbon electrodes were performed with iron nanoparticles via electrochemical reduction of iron(II). Read More

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http://dx.doi.org/10.1080/00032719.2015.1030675DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4880374PMC
May 2015
1 Read

RECENT ADVANCES IN ULTRA-HIGH PERFORMANCE LIQUID CHROMATOGRAPHY FOR THE ANALYSIS OF TRADITIONAL CHINESE MEDICINE.

Anal Lett 2014 ;47(11):1835-1851

Food Composition and Methods Development Laboratory, Beltsville Human Nutrition Research Center, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, MD, US.

Traditional Chinese medicine has been widely used for the prevention and treatment of various diseases for thousands of years in China. Ultra-high performance liquid chromatography (UHPLC) is a relatively new technique offering new possibilities. This paper reviews recent developments in UHPLC in the separation and identification, fingerprinting, quantification, and metabolism of traditional Chinese medicine. Read More

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http://dx.doi.org/10.1080/00032719.2014.888727DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4100713PMC
January 2014
2 Reads

MULTIELEMENT SOLID PHASE PRECONCENTRATION USING A CHELATING RESIN OF STYRENE DIVINYLBENZENE COPOLYMER AND APPLICATION TO ANALYSIS OF SEAWATER AND FISH OTOLITHS BY INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY (ICP�MS).

Anal Lett 2014 ;47(1):58-76

Department of Chemistry & Biochemistry, Jackson State University, PO Box 17910, Jackson, MS 39217 USA.

A new chelating resin has been synthesized by immobilizing 4-(2-thiazolylazo) resorcinol (TAR) onto styrene divinlybenzene copolymer and examined for on-line solid phase extraction/preconcentration of Cd, Co, Cu, Ni, Pb and Zn in seawater and fish otoliths for determination by inductively plasma mass spectrometry (ICP-MS). A volume of 5.0 mL sample solution was loaded onto the mini column of TAR immobilized resin at 2. Read More

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http://dx.doi.org/10.1080/00032719.2013.831428DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4068351PMC
January 2014
3 Reads

Preparation of PbS Nanoparticles by Phase-Transfer Method and Application to Pb-Selective Electrode Based on PVC Membrane.

Anal Lett 2008 Oct 2;41(15):2844-2859. Epub 2008 Dec 2.

College of Chemistry and Material Science, Shandong Agricultural University, Shandong, P. R. China.

A novel approach to prepare homogeneous PbS nanoparticles by phase-transfer method was developed. The preparatory conditions were studied in detail, and the nanoparticles were characterized by transmission electron microscopy (TEM) and UV-vis spectroscopy. Then a novel lead ion-selective electrode of polyvinyl chloride (PVC) membrane based on these lead sulfide nanoparticles was prepared, and the optimum ratio of components in the membrane was determined. Read More

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http://dx.doi.org/10.1080/00032710802421780DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2607136PMC
October 2008
4 Reads

Quantum Dots as Reporters in Multiplexed Immunoassays for Biomarkers of Exposure to Agrochemicals.

Anal Lett 2007 Jan;40(7):1423-1433

University of California, Davis, California.

The application of quantum dots (QDs) as labels in immunoassay microarrays for the multiplex detection of 3-phenoxybenzoic acid (PBA) and atrazine-mercapturate (AM) has been demonstrated. PBA and AM are biomarkers of exposure to the pyrethroid insecticides and to the herbicide atrazine, respectively. Microarrays were fabricated by microcontact printing of the coating antigens in line patterns onto glass substrates. Read More

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http://dx.doi.org/10.1080/00032710701327088DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2600528PMC
January 2007

A piezoelectric immunosensor for the detection of cortisol.

Anal Lett 1995 ;28(12):2149-59

Department of Chemistry, Southern University and A&M College, Baton Rouge, LA 70813, USA.

A piezoelectric crystal immunosensor has been developed for the detection and determination of cortisol. Cortisol antibody was layered onto the gold electrodes of a 10 MHz piezoelectric crystal which was pre-coated with either protein A or gluteraldehyde. Crystals pre-coated with protein A showed the best results with respect to stability and sensitivity. Read More

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February 1998
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