Publications by authors named "Nicholas Schramek"

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Determination and quantitation of sildenafil and its major metabolite in the breast milk of a lactating woman.
Uwe Wollein, Bernd Schech, Jochen Hardt, Nicholas Schramek

J Pharm Biomed Anal· February 2016

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Pyrazolopyrimidines in 'all-natural' products for erectile dysfunction treatment: the unreliable quality of dietary supplements.
Nicholas Schramek, Uwe Wollein, Wolfgang Eisenreich

Food Addit Contam Part A Chem Anal Control Expo Risk Assess· December 2015

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Potential metal impurities in active pharmaceutical substances and finished medicinal products - A market surveillance study.
Uwe Wollein, Bettina Bauer, Renate Habernegg, Nicholas Schramek

Eur J Pharm Sci· September 2015

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Identification of new synthetic PDE-5 inhibitors analogues found as minor components in a dietary supplement.
Nicholas Schramek, Uwe Wollein, Wolfgang Eisenreich

J Pharm Biomed Anal· August 2014

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Isotopologue profiling of triterpene formation under physiological conditions. Biosynthesis of lupeol-3-(3'-R-hydroxy)-stearate in Pentalinon andrieuxii.
Luis M Peña-Rodríguez, Alejandro Yam-Puc, Nihat Knispel, Nicholas Schramek, Claudia Huber

J Org Chem· April 2014

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Biosynthesis of panaxynol and panaxydol in Panax ginseng.
Nihat Knispel, Elena Ostrozhenkova, Nicholas Schramek, Claudia Huber, Luis M Peña-Rodríguez

Molecules· July 2013

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Simultaneous determination of alkyl mesilates and alkyl besilates in finished drug products by direct injection GC/MS.
Uwe Wollein, Nicholas Schramek

Eur J Pharm Sci· January 2012

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Identification of novel sildenafil-analogues in an adulterated herbal food supplement.
Uwe Wollein, Wolfgang Eisenreich, Nicholas Schramek

J Pharm Biomed Anal· December 2011

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Artemisinin biosynthesis in growing plants of Artemisia annua. A 13CO2 study.
Nicholas Schramek, Huahong Wang, Werner Römisch-Margl, Birgit Keil, Tanja Radykewicz

Phytochemistry· February 2010

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Biosynthesis of riboflavin. Screening for an improved GTP cyclohydrolase II mutant.
Martin Lehmann, Simone Degen, Hans-Peter Hohmann, Markus Wyss, Adelbert Bacher, Nicholas Schramek

FEBS J· August 2009

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Biosynthesis of the chromogen hermidin from Mercurialis annua L.
Elena Ostrozhenkova, Eva Eylert, Nicholas Schramek, Avi Golan-Goldhirsh, Adelbert Bacher

Phytochemistry· February 2008

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13CO2 as a universal metabolic tracer in isotopologue perturbation experiments.
Werner Römisch-Margl, Nicholas Schramek, Tanja Radykewicz, Christian Ettenhuber, Eva Eylert

Phytochemistry· November 2007

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Biosynthesis of isoprenoids. purification and properties of IspG protein from Escherichia coli.
Ferdinand Zepeck, Tobias Gräwert, Johannes Kaiser, Nicholas Schramek, Wolfgang Eisenreich

J Org Chem· November 2005

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Biosynthesis of vitamin B2: diastereomeric reaction intermediates of archaeal and non-archaeal riboflavin synthases.
Boris Illarionov, Wolfgang Eisenreich, Nicholas Schramek, Adelbert Bacher, Markus Fischer

J Biol Chem· August 2005

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Evolution of vitamin B2 biosynthesis: riboflavin synthase of Arabidopsis thaliana and its inhibition by riboflavin.
Markus Fischer, Ilka Haase, Richard Feicht, Nicholas Schramek, Peter Köhler

Biol Chem· May 2005

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Pre-steady-state kinetic analysis of riboflavin synthase using a pentacyclic reaction intermediate as substrate.
Boris Illarionov, Ilka Haase, Markus Fischer, Adelbert Bacher, Nicholas Schramek

Biol Chem· February 2005

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IspH protein of Escherichia coli: studies on iron-sulfur cluster implementation and catalysis.
Tobias Gräwert, Johannes Kaiser, Ferdinand Zepeck, Ralf Laupitz, Stefan Hecht, Nicholas Schramek

J Am Chem Soc· October 2004

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Biochemical characterization of Bacillus subtilis type II isopentenyl diphosphate isomerase, and phylogenetic distribution of isoprenoid biosynthesis pathways.
Ralf Laupitz, Stefan Hecht, Sabine Amslinger, Ferdinand Zepeck, Johannes Kaiser, Nicholas Schramek

Eur J Biochem· July 2004

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Presteady state kinetic analysis of riboflavin synthase.
Boris Illarionov, Ilka Haase, Adelbert Bacher, Markus Fischer, Nicholas Schramek

J Biol Chem· November 2003

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Temperature-dependent presteady state kinetics of lumazine synthase from the hyperthermophilic eubacterium Aquifex aeolicus.
Ilka Haase, Markus Fischer, Adelbert Bacher, Nicholas Schramek

J Biol Chem· September 2003

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Biosynthesis of riboflavin. Single turnover kinetic analysis of 6,7-dimethyl-8-ribityllumazine synthase.
Nicholas Schramek, Ilka Haase, Markus Fischer, Adelbert Bacher

J Am Chem Soc· April 2003

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Biosynthesis of pteridines. Reaction mechanism of GTP cyclohydrolase I.
Jorge Rebelo, Günter Auerbach, Gerd Bader, Andreas Bracher, Herbert Nar, Nicholas Schramek

J Mol Biol· February 2003

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Enzyme catalysis via control of activation entropy: site-directed mutagenesis of 6,7-dimethyl-8-ribityllumazine synthase.
Markus Fischer, Ilka Haase, Klaus Kis, Winfried Meining, Rudolf Ladenstein, Nicholas Schramek

J Mol Biol· February 2003

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Biosynthesis of vitamin B2.
Johannes Kaiser, Nicholas Schramek, Sabine Eberhardt, Stefanie Püttmer, Michael Schuster

Eur J Biochem· November 2002

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Reaction mechanism of GTP cyclohydrolase I: single turnover experiments using a kinetically competent reaction intermediate.
Nicholas Schramek, Andreas Bracher, Markus Fischer, Günter Auerbach, Herbert Nar

J Mol Biol· February 2002

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