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  • Sensitive quantitative analysis of C-peptide in human plasma by 2-dimensional liquid chromatography-mass spectrometry isotope-dilution assay. 16556683

    BACKGROUND: Isotope-dilution assays (IDAs) are well established for quantification of metabolites or small drug molecules in biological fluids. Because of their increased specificity, IDAs are an alternative to immunoassays for measuring C-peptide. METHODS: We evaluated a 2-dimensional liquid chromatography-mass spectrometry (2D...
    Document Type:
    Reference
    Product Catalog Number:
    HCP-20K
    Product Catalog Name:
    Human C-Peptide RIA

  • Impact of purified water quality on molecular biology experiments. 12747591

    Purified water is a reagent used in a variety of molecular biology experiments, for sample and media preparation, in mobile phases of liquid chromatography techniques, and in rinsing steps. The combination of several technologies in water purification systems allows delivering high-purity water adapted to each application and te...
    Document Type:
    Reference
    Product Catalog Number:
    Multiple
    Product Catalog Name:
    Multiple

  • Using ultrapure water in ion chromatography to run analyses at the ng/L level 15250398

    Thanks to enhanced capabilities, ion chromatography (IC) occupies an increasing position in many types of applications. Achieving ideal performances for an extended life-time can only be reached, however, if the IC system is operated in optimum experimental conditions. Among the various parameters that need to be controlled, wat...
    Document Type:
    Reference
    Product Catalog Number:
    Multiple
    Product Catalog Name:
    Multiple

  • Using ultrapure water in ion chromatography to run analyses at the ng/L level 15250398

    Thanks to enhanced capabilities, ion chromatography (IC) occupies an increasing position in many types of applications. Achieving ideal performances for an extended life-time can only be reached, however, if the IC system is operated in optimum experimental conditions. Among the various parameters that need to be controlled, wat...
    Document Type:
    Reference
    Product Catalog Number:
    Multiple

  • Plasma and urinary oxalate and glycolate in healthy subjects. 8419038

    High-performance ion chromatography (HPIC) has been widely used for oxalate analysis and, more recently, for glycolate analysis. We describe a procedure for sample preparation in which the plasma ultrafiltrate is acidified during harvesting with a cation-exchange resin, and the chloride is removed before the ion chromatography,...
    Document Type:
    Reference
    Product Catalog Number:
    20-176
    Product Catalog Name:
    100X GTPγS, 10mM

  • Use of benchtop exactive high resolution and high mass accuracy orbitrap mass spectrometer for screening in horse doping control. 21742125

    Liquid chromatography-mass spectrometry (LC-MS) has been widely used in doping control laboratories over the last two decades. Currently, simple quadrupole, triple quadrupole and ion trap are the most commonly employed analyzers in toxicological analysis. Nevertheless, the main lack of these technologies is the restricted number...
    Document Type:
    Reference
    Product Catalog Number:
    14-278
    Product Catalog Name:
    Ras Assay Reagent (Raf-1 RBD, agarose)

  • Urinary metanephrine and normetanephrine determined without extraction by using liquid chromatography and coulometric array detection. 8375055

    We describe a procedure for the direct measurement of metanephrine (MN) and normetanephrine (NMN) in hydrolyzed urine, using HPLC with coulometric array detection. Acid-hydrolyzed samples were diluted and filtered before separation by isocratic reversed-phase ion-pair chromatography. Eight serial coulometric sensors, set at incr...
    Document Type:
    Reference
    Product Catalog Number:
    20-176
    Product Catalog Name:
    100X GTPγS, 10mM

  • Homocysteine and other thiols determined in plasma by HPLC and thiol-specific postcolumn derivatization. 8353942

    We describe a versatile high-performance liquid-chromatographic method for determining homocysteine and other plasma sulfhydryls. Using three different procedures for preparation of plasma, we determined total, free (non-protein-bound), and reduced forms of homocysteine, cysteine, glutathione, cysteinylglycine, and gamma-glutamy...
    Document Type:
    Reference
    Product Catalog Number:
    20-176
    Product Catalog Name:
    100X GTPγS, 10mM

  • A total water purification system A total water purification system

    Many of the analytical and molecular biology applications that require the use of water include high-performance liquid chromatography (HPLC), total organic carbon (TOC) analysis, sample and media preparation, rinse steps in assays, and gel electrophoresis. Different types of laboratories run experiments that require varying lev...
    Document Type:
    Reference
    Product Catalog Number:
    Multiple
    Product Catalog Name:
    Multiple