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Analytical chemistry

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  1. Oligopeptides as mimic of acetylcholinesterase: from the rational design to the application in solid-phase extraction for pesticides.

    Analytical chemistry 80(23):9150 (2008) PMID 19551938

    Three different peptides (His-Glu-Pro-Ser, His-Gly-Ser-Ala and Glu-Pro-Ser-Ala) were selected and tested to be used as affinity binding receptors for organophosphate and carbamate pesticides. The peptides were rationally designed by mimicking acetylcholinesterase active site. The simulated bindi...
  2. Integration of microdialysis sampling and microchip electrophoresis with electrochemical detection.

    Analytical chemistry 80(23):9257 (2008) PMID 19551945 PMCID PMC2771943

    Here we describe the fabrication, optimization, and application of a microfluidic device that integrates microdialysis (MD) sampling, microchip electrophoresis (ME), and electrochemical detection (EC). The manner in which the chip is produced is reproducible and enables the fixed alignment of th...
  3. Single-cell chemical lysis method for analyses of intracellular molecules using an array of picoliter-scale microwells.

    Analytical chemistry 80(23):9141 (2008) PMID 19551983

    Analyzing the intracellular contents and enzymatic activities of single cells is important for studying the physiological and pathological activities at the cellular level. For this purpose, we developed a simple single-cell lysis method by using a dense array of microwells of 10-30-pL volume fa...
  4. Obtaining Nernstian response of a Ca(2+)-selective electrode in a broad concentration range by tuned galvanostatic polarization.

    Analytical chemistry 80(23):9181 (2008) PMID 19551940

    Linear Nernstian response is obtained for a neutral ionophore-based Ca(2+)-selective electrode down to 10(-10) M CaCl2 by means of galvanostatic polarization. The densities of the applied cathodic current were tuned for particular concentrations of Ca2+. The procedure included recording the pote...
  5. Impedance biosensor for peanut protein Ara h 1.

    Analytical chemistry 80(23):9157 (2008) PMID 19551984

    A reagentless electrochemical impedance biosensor for detection of peanut protein Ara h 1, one of the allergenic proteins found in peanuts, has been demonstrated using an Au substrate onto which an antibody film has been immobilized. Following initial stabilization of the self-assembled monolaye...
  6. Analysis of hybrid silica materials with the aid of conventional NMR and GC/MS.

    Analytical chemistry 80(23):9355 (2008) PMID 19551951

    Two simple and straightforward procedures for determining the organic content of hybrid silica materials by means of conventional NMR and GC/MS techniques are described. The methods involve dissolving the hybrid material either in a concentrated solution of sodium hydroxide in deuterated water c...
  7. Determination of pesticide residues in fruit-based soft drinks.

    Analytical chemistry 80(23):8966 (2008) PMID 19551973

    Here we report the first worldwide reconnaissance study of the presence and occurrence of pesticides in fruit-based soft drinks. While there are strict regulations and exhaustive controls for pesticides in fruits, vegetables, and drinking water, scarce attention has been paid to highly consumed ...
  8. Development of a selective ESI-MS derivatization reagent: synthesis and optimization for the analysis of aldehydes in biological mixtures.

    Analytical chemistry 80(23):9042 (2008) PMID 19551932

    In LC-MS, derivatization is primarily used to improve ionization characteristics, especially for analytes that are not (efficiently) ionized by ESI or APCI such as aldehydes, sugars, and steroids. Derivatization strategies are then directed at the incorporation of a group with a permanent charge...
  9. Effect of sample heterogeneity on the interpretation of QCM(-D) data: comparison of combined quartz crystal microbalance/atomic force microscopy measurements with finite element method modeling.

    Analytical chemistry 80(23):8891 (2008) PMID 18954085

    A quartz crystal microbalance was integrated into an AFM in order to monitor the adsorption of biomolecules to the resonator surface with both atomic force microscopy and microgravimetry. The comparison between the two techniques allows the fractional coverage of the surface, theta, to be correl...
  10. Identification of viruses using microfluidic protein profiling and Bayesian classification.

    Analytical chemistry 80(23):9005 (2008) PMID 19551975

    We present a rapid method for the identification of viruses using microfluidic chip gel electrophoresis (CGE) of high-copy number proteins to generate unique protein profiles. Viral proteins are solubilized by heating at 95 degrees C in borate buffer containing detergent (5 min), then labeled wi...