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Hyphenated Techniques as Modern Detection Systems in Ion Chromatography
K.M. Ruth, A. Wille, S. Czyborra and J. Kleimann

Historically ion chromatography (IC) using conductivity detection has been successfully used for the analysis of ionic (e.g., anions and cations) and polar substances (e.g., organic acids or sugars). However, due to current toxicity concerns, analyses in complex matrices require improved sensitivities and selectivities.

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Sequence-Specific Ni(II)-Dependent Peptide Bond Hydrolysis for Protein Engineering. Combinatorial Library Determination of Optimal Sequences

The sequence-specific cleavage of the peptide bond is a crucial procedure in protein engineering and purification. The extreme stability of this bond, with half-life for spontaneous hydrolysis estimated as 350-600 years at neutral pH and room temperature, limits the range of appropriate cleavage reagents.

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An improved data processing pipe-line for comprehensive H-NMR and X/MS -omics data
R. J. O. Torgrip, K. M. Åberg, E. Alm

In the post acqusition analysis of comprehensive -omics data the pre-processing pipe-line is crucial to extract the maximum possible amount of information from the data. Here we show a processing pipe-line for (1D)H-NMR and (2D)X/MS data comprising; feature detection, inter-sample feature alignment and internal-standard free normalization that outperforms today’s state-of-the-art processing schemes.

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LC-MS Approaches to Profiling of Non-Radiolabelled Metabolites in Response to Recent Regulatory Changes
Richard Clayton, Caroline Anderson, Brian Morrison and Lindsay Corfield

Following publication of the FDA MIST guidelines and revision of ICH M3, there is increasing interest in obtaining metabolic profiling data at an early stage in the development of a drug. This has led to a requirement to estimate the relative abundance of metabolites in samples prior to the synthesis of the radiolabelled compound and from a wider range of studies.

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Basic amino acids profiling during hepatic tumorigenesis by hydrophilic interaction liquid chromatography tandem mass spectrometry (HILIC-MS/MS)
O. D’Apolito (1), D. Garofalo (1), D. Paris (2), D. Melck (2), R. Calemma (3), F. Izzo (3), G. Palmieri (2), A. Motta (2) and G. Corso (1)

This study is aimed to characterize basic aminoacids profiles from liver tissues of primary hepatocarcinoma (HCC) and metastases from colorectalcarcinomas (MET), and from adjacent cirrhotic related hepatitis-C-virus (CIRR) and non-cirrhotic normal liver (NT). Arginine levels in MET are significantly higher (P<0.05) compared to NT, CIRR and HCC. Although our preliminary data should be validated, profiling of basic aminoacids could allow a better classification of liver malignancies in humans.

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A method for the quantification of sterols for a rapid screening of Smith-Lemli-Opitz Syndrome by Atmospheric Pressure Thermal Desorption Chemical Ionization -Mass Spectrometry (APTDCI -MS)
G. Paglia (1), O. D'Apolito (1), M. Gelzo (2), D. Garofalo (1), A. Dello Russo (2), and G. Corso (1,2)

An atmospheric pressure thermal desorption chemical ionization MS/MS method to quantify cholesterol and 7- and 8-dehydrocholesterols directly in dried blood/plasma spots, is reported. Cholesterol levels from dried plasma spots of 23 unaffected subjects and 9 Smith-Lemli-Opitz patients by APTDCI-MS/MS method and by enzymatic method were correlated (y=0.9166x + 0.3811; r= 0.8831) as well as dehydrocholesterol levels obtained by APTDCI-MS/MS method and by GC-FID method (y=0.8214x + 0.7388; r= 0.828

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Alteration of urinary metabolic profile in rats treated with methylmercury
Pierre Ayotte, Dinesh Kumar, Pierre-Yves Tremblay, Xiaolei Jin, Sevini Shahbaz, Rekha Mehta, Hing Man Chan, and Oliver Fiehn

A metabolomic approach was used to detect changes in urinary metabolic profile of rats treated orally with methylmercury (MeHg), a ubiquitous fish contaminant with well known neurotoxic properties. An aliquot of urine was collected on day 14, extracted and the extract successively methoxymated and trimethylsilylated prior to analysis by GC/TOF-MS. Results indicate that several metabolic pathways were altered by MeHg treatment, including urea cycle, glutathione metabolism and amino acid degradati

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Minor change in the structure major change in the mass spectrum in the example of an N-toluene-pyrrolidine derivative
József Pánczél

MS2 and further MSn spectra of SAR cannot provide sufficient information for metabolite structure elucidation because the masses of fragments in MSn correspond only to separate moieties of SAR. Nevertheless almost the exact structure of a dehydrogenated compound - has a poor MS2 spectrum - could be determined by further fragmentation in an LTQ-Orbitrap instrument and using the MSn mass spectra of an impurity of SAR.

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Capture Compounds towards a targeted reduction of proteome complexity
Erik Duelsner, Aysel Alici, Christian Jurinke, Hubert Koester

Capture Compound Mass Spectrometry (CCMS) enables the enrichment of proteins based on their functionality. CCMS is commercialized as kits for research applications and in collaborations with pharmaceutical companies. The focus is on investigating mechanisms of drug action and avoidance of toxic effects of small molecule drugs.

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Scientific News
Embalming Study ‘Rewrites’ Key Chapter in Egyptian History
New evidence to suggest that the origins of mummification started in ancient Egypt 1,500 years earlier than previously thought.
Identification of Psoriatic Arthritis Mediators in Synovial Fluid
This study represents the most comprehensive proteomic analysis of psoriatic arthritis synovial fluid, to date.
Mass Spec-Based Metabolomics Workflows to Evaluate Plant Immunity
This article reviews metabolomics studies used to evaluate plant immunity with an emphasis on mass spectrometry in its many forms.
Using LC-MS to Analyse Sulfonamides in Food Grade Honey
Sulfonamides are one of a number of groups of chemicals whose presence in honey is limited by international regulations.
Reimagining UHPLC
To learn more about the new Vanquish UHPLC system from Thermo Fisher Scientific we spoke to Wulff Niedner, Director of HPLC Product Marketing.
Mass Spec Predicts Improved Response to Anti-HER2 Therapy in Breast Cancer
Immunohistochemistry is the standard technique for detecting HER2 protein expression, it does not provide absolute quantification of this receptor and is prone to false-positives.
Mass Spectrometry Tool Helps Guide Brain Cancer Surgery
A tool to help brain surgeons test and more precisely remove cancerous tissue was successfully used during surgery, according to a Purdue University and Brigham and Women's Hospital study.
Evaluating Acute Hydrogen Sulfide Poisoning in Rats through Serum Metabolomics
Through the use of GC/MS-based metabolomics, researchers have evaluated the effect of acute hydrogen sulfide poisoning on the metabolic profiles of rats.
Simultaneous Determination of Free Urinary Steroids
Researchers have described an LC–MS/MS method that accurate, precise and is in accordance with FDA guidelines.
Human Proteome Project Uncovers 193 Proteins Not Known to Exist
The team of international researchers reports the identification of 193 novel proteins that came from regions of the genome not predicted to code for proteins.
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