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A novel method for coupling capillary columns
Wil van Egmond, Daniela Peroni,

Using a proprietary, low-melting, deactivated glass we have developed a novel instant Meltfit™ connection. Reliable connectors are made in-situ in less than a minute.

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Single stage reversed-phase liquid chromatography-mass spectrometry for the characterization of triglyceride positional isomers.
Haslina Hasan, Brendan J Keely and Julie Wilson

The high level of selectivity afforded by RP-HPLC in combination with CID allowed recognition of eight groups of TAG positional isomers. Development of UPLC approach has reduced the run time by half while maintaining separation. The improved method combined with principal components analysis was used to assess the extent of variation of major TAGs in subcutaneous and intermuscular pork fat from four different locations of adipose tissues.

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Five noncovalent peptidic ligands show different affinity rankings in solution and gas phase
Andrey Dyachenko , Michael Goldflam , Marta Vilaseca , Ernest Giralt

Stability of noncovalent complexes of VEGF protein with 5 peptidic ligands is studied. Experiments were conducted in solution (NMR CSP, ITC) and in gas phase (CID TOF MS). Each ligand differs from others in chirality of one amino acid. It was shown, that trend of stability of the studied noncovalent complexes is reversed in the gas phase relatively to the solution. An explanation of this behavior is presented.

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Mass-Spectrometric Analysis with Sequenom EpiTYPER of GNAS Methylation in Pseudohypoparathyroydism Type Ib Patients Reveals Overall Methylation Defects also for the Familial Cases
Benedetta Izzi1, Bart Claes2, Diether Lambrechts2, Chris Van Geet1,3, Kathleen Freson1

Sequenom EpiTYPER analysis of GNAS methylation in Pseudohypoparathyroidism type Ib patients reveals overall GNAS methylation defects also for the familial cases. Such abnormalities are not detectable via old methodologies such as PCR followed by methylation specific restriction digestion and are here for the first time described.

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Force Spectroscopy of the Iron Atom in Heme Proteins
J. T. Sage, B M. Leu, T. H. Ching, Y. Zhang, J. E. Straub, J. Zhao, W. Sturhahn, E. E. Alp

Nuclear resonance vibrational spectroscopy (NRVS) selectively reveals the complete vibrational density of states (VDOS) of a Mössbauer probe nucleus within a protein. Frequency moments of the VDOS determine effective force constants for 57Fe at the active sites of cytochrome c (cyt c) and deoxymyoglobin (Mb).

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No Impact of Dietary Iodine Restriction in Short Term Development of Hypothyroidism Following Fixed Dose Radioactive Iodine Therapy for Graves Disease
Jubbin J Jacob*, Charles Stephen§, Nihal Thomas*, Regi Oommen¶ and M.S.Seshadri*

To study the outcomes at 6 months after fixed dose 131I therapy for Graves’ disease (GD) with an iodine restricted diet.

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SOME BIOLOGICAL PROPERTIES OF TRITERPENOID ACIDS
S.N. Morozkina, O.I. Antimonova, E.M. Eremenko*, A.G. Shavva

Ursolic and betulinic acids acids induce the processes of apoptosis. We tested the risk of osteoporosis induction under influence of triterpenoids, since they can interact with glucocorticoid receptors. In experiments on oviriectomized rats we found that acids do not show any negative influence on percentage of mineral components in the femur and have cholesterol-lowering action under experimental conditions.

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the packing of preparative liquid chromatography columns
f;dardoize

a new type of preparative liquid chromatography columns is described with applications of the efficiency

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Achieving Great Science : Bringing Together Physical Measurements and Chemical Analysis
Michael Boruta, Michel Hachey

Many problems in analytical spectroscopy require insight from several different techniques to adequately resolve the problem. A common difficulty with using several techniques is often the ability to manage the various data types and making the data available for review, analysis and reporting.

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Showing Results 61 - 70 of 100
Scientific News
Mass Spectrometry in Your Hand
Electrospray arrays can dramatically downsize systems and costs for onsite chemical analysis and many other applications.
Study Aims to Develop Breath Test for COPD
A new clinical iniative, lead by NYU Langone Medical Center, aims to determine a breath test’s effectiveness to identify volatile organic compounds (VOCs) in human breath that are biomarkers of chronic obstructive pulmonary disease (COPD).
Comparison of Caffeinated and Decaffeinated Coffee - Implications for Alzheimer's Disease
Researchers from the National University of Singapore successfully demonstrated the viability of GC-TOF-MS as an analytical platform for metabolomics analysis of coffee samples.
Repressing the Repressors May Drive Tissue-Specific Cancers
Stowers scientists establish Drosophila and mammalian models to study mutations found in pediatric brain tumors.
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.
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