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73 Newest Publications about the topic calibration standards


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Mass spectrometric real‐time monitoring of an enzymatic phosphorylation assay using internal standards and data‐handling freeware

15-Mar-2016 | Michael Krappmann, Arjen R. Boer, Daniël R.W. Kool, Hubertus Irth, Thomas Letzel, Rapid Communications in Mass Spectrometry, 2016

Rationale Continuous‐flow reaction detection systems (monitoring enzymatic reactions with mass spectrometry (MS)) lack quantitative values so far. Therefore, two independent internal standards (IS) are implemented in a way that the online system stability can be observed, quantitative ...


Analysis of small molecule antibody–drug conjugate catabolites in rat liver and tumor tissue by liquid extraction surface analysis micro‐capillary liquid chromatography/tandem mass spectrometry

29-Feb-2016 | Christian Lanshoeft, Gerhard Stutz, Walid Elbast, Thierry Wolf, Markus Walles, Markus Stoeckli, Franck Picard, Olivi ..., Rapid Communications in Mass Spectrometry, 2016

Rationale Antibody–drug conjugates (ADCs) are some of the most promising antibody‐related therapeutics. The fate of the cytotoxic moiety of ADCs in vivo after proteolytic degradation of the antibody needs to be well understood in order to mitigate toxicity risks and design proper first in ...


Molecules, Vol. 21, Pages 94: HPLC Analysis, Optimization of Extraction Conditions and Biological Evaluation of Corylopsis coreana Uyeki Flos

15-Jan-2016 | Seo, Ji-Hye ; Kim, Jung-Eun ; Shim, Jung-Hyun ; Yoon, Goo ; Bang, Mi-Ae ; Bae, Chun-Sik ; Lee, Kyung-Jin ; Park, Dae ..., Molecules, 2016

A method for the separation and quantification of three flavonoids and one isocoumarin by reverse-phase high performance liquid chromatography (HPLC) has been developed and validated. Four constituents present in a crude ethanolic extract of the flowers of Coryloposis coreana Uyeki, were ...


Measurement of extremely 2H‐enriched water samples by laser spectrometry: application to batch electrolytic concentration of environmental tritium samples

05-Jan-2016 | L. I. Wassenaar, B. Kumar, C. Douence, D. L. Belachew, P. K. Aggarwal, Rapid Communications in Mass Spectrometry, 2016

Rationale Natural water samples artificially or experimentally enriched in deuterium (2H) at concentrations up to 10,000 ppm are required for various medical, environmental and hydrological tracer applications, but are difficult to measure using conventional stable isotope ratio mass ...


Laser desorption sample transfer for gas chromatography/mass spectrometry

07-Dec-2015 | Chinthaka A. Seneviratne, Suman Ghorai, Kermit K. Murray, Rapid Communications in Mass Spectrometry, 2015

Rationale Ambient mass spectrometry can detect small molecules directly, but complex mixtures can be a challenge. We have developed a method that incorporates small molecule separation based on laser desorption with capture on a solid‐phase microextraction (SPME) fiber for injection into a gas ...


Polyether polyols as GPC calibration standards for determination of molecular weight distribution of polyether polyols

29-Jul-2015 | Mohd Azmil Mohd Noor, Vahid Sendijarevic, Hazimah Abu Hassan, Ibrahim Sendijarevic, Tuan Noor Maznee Tuan Ismail, Ho ..., Journal of Applied Polymer Science, 2015

ABSTRACT Average molecular weights (Mn, Mw and Mp) are important characteristics of oligomers and polymers, and therefore there is a need to have a precise and reliable determination method. A gel permeation chromatography (GPC) coupled with a single refractive index detector was used to ...


Development of undersized (12.5 mm diameter) low‐dilution glass beads for X‐ray fluorescence determination of 34 components in 200 mg of igneous rock for applications with geochemical and archeological silicic samples

14-Jul-2015 | Shintaro Ichikawa, Hiroaki Onuma, Toshihiro Nakamura, X-Ray Spectrometry, 2015

A low‐dilution, undersized (12.5 mm diameter) glass–bead technique was developed for X‐ray fluorescence determination of 34 components (Na2O, MgO, Al2O3, SiO2, P2O5, K2O, CaO, TiO2, MnO, Fe2O3, V, Cr, Co, Ni, Cu, Zn, Rb, Sr, Y, Zr, Nb, Cs, Ba, La, Pr, Nd, Sm, Gd, Dy, Er, Yb, Hf, W, and Pb) in ...


High‐throughput workflow for identification of phosphorylated peptides by LC‐MALDI‐TOF/TOF‐MS coupled to in situ enrichment on MALDI plates functionalized by ion landing

05-May-2015 | Lukáš Krásný, Petr Pompach, Marcela Strnadová, Radovan Hynek, Karel Vališ, Vladimír Havlíček, Petr Novák, Michael Volný, Journal of Mass Spectrometry, 2015

We report an MS‐based workflow for identification of phosphorylated peptides from trypsinized protein mixtures and cell lysates that is suitable for high‐throughput sample analysis. The workflow is based on an in situ enrichment on matrix‐assisted laser desorption/ionization (MALDI) plates that ...


Universal method for the determination of nonionic surfactant content in the presence of protein

24-Apr-2015 | Ziping Wei, Susanna Bilbulian, Jingning Li, Ratnesh Pandey, Ellen O'Connor, Jose Casas‐Finet, Patricia W. Cash, Journal of Separation Science, 2015

J. Sep. Sci. 2015, 38, 1318–1325 DOI: 10.1002/jssc.201400766 This cover picture illustrates how multiple nonionic surfactants can be quantified using the same method as they share a common hydrolysis product. Protein samples containing nonionic surfactants are hydrolyzed and the ...


Commercial formaldehyde standard for mass calibration in mass spectrometry

17-Feb-2015 | Jadwiga Lyczko, Daniel G. Beach, Wojciech Gabryelski, Journal of Mass Spectrometry, 2015

Common calibration standards for mass spectrometry can be a source of many problems including instrument contamination, ionization suppression and formation of unidentified ions during subsequent analysis. In this article, we present a new approach for the calibration of mass analyzers such as a ...


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