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Metabolite Profiling Using Human Hepatocyte Co-cultures and UHPLC-QTOF-MS with Data Independent MS/MS
Ronghua Wang, Ragu Ramanathan, Cornelia Smith, Caroline Lee, Helen Shen, and Zamas Lam

Purpose
To investigate a high throughput workflow for metabolite profiling using a novel human in vitro system and advanced UHPLC-MS/MS techniques to accurately predict human metabolite profile in vivo.

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Mixtures Analysis of Complex Mixtures
Michael Bernstein; Carlos Cobas; Santi Domínguez; Manuel Pérez; Agustín Barba

We describe an NMR method to quantify mixture components in wine, edible oils, etc. The method is fully customizable, and amenable to high throughput operation.

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A Complete Wine Analysis Using Multiplets Detection
Dr Michael Bernstein1; Agustín Barba1; Dr Susanne Klein2; Dr Andrea Dreiseitel2; Daniel Heidger2 and Volker Heidger2

NMR mixtures analysis can be used to determine the concentration of key components in wine. Here we show the analysis using SMA from Mestrelab.

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DPPH scavenging activities of selected flavonoids and their mixtures
Brachos D.(1)

The aim is to identify the ati-oxidant activity of selected flavonoids (quercetin, luteolin and galangin) and their mixtures using DPPH method including their synergistic or antagonistic interactions.

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Correlation between plasma levels of lutein and oxidized low density lipoproteins: a short human intervention study
Tiziana Bacchetti, Gianna Ferretti

The increase of plasma carotenoids, in particular lutein, after dietary treatment for two weeks is associated with a significant protective effect against lipid peroxidation of plasma lipoproteins.

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Analysis of 10 systemic pesticide residues in various baby foods using liquid chromatography-tandem mass spectrometry
Jae-Han Shim, Angel Yang, A. M. Abd El-Aty, Jong-Hyouk Park, Ayman Goudah, Md. Musfiqur Rahman, Jung-Ah Do

The method developed was sensitive and selective, and detected the analytes below the MRL established by the European Commission and the Korea Food and Drug Administration. The combination of QuEChERS sample preparation and LC-MS/MS analysis provided acceptable quantitative and qualitative results in baby food.

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Residue Analysis of Etoxazole in Red Pepper using Gas Chromatography: Application to Dissipation Pattern
Sung-Woo Kim, Jin Jang, Md. Musfiqur Rahman, A. M. Abd El-Aty, Ah-Young Ko, Jong-Heui Choi, Jae-Han Shim

The dSPE of QuEChERS was replaced with an SPE cartridge, which provided a very clean chromatogram, although a small recovery percentage was obtained. The method fulfilled all validation criteria and was useful for monitoring etoxazole residues in red pepper. It can also be used and optimized for other fruit and vegetable matrices.

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Simultaneous multi-determination and transfer of eight pesticide residues from green tea leaves to infusion using gas chromatography
Sung-Woo Kim, Soon-Kil Cho, A. M. Abd El-Aty, Md. Musfiqur Rahman, Jeong-Heui Choi, Jae-Han Shim

Acetonitrile was used as the extraction solvent with sodium chloride to enhance the partitioning of analytes into the organic phase. Recovery indicated good method accuracy and repeatability, and was within the acceptable range for residue determinations. The mere presence of pesticide residues in tea does not necessarily mean that the tea has become toxic and would pose a health hazard. We revealed that only a negligible or small percentage of pesticides in tea is transferred to the infusion.

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Matrix enhancement effect: A blessing or curse for gas chromatography?
Jae-Han Shim, Md. Musfiqur Rahman, A. M. Abd El-Aty

A sharp, narrow, and sensitive peak is a pre-condition for a sensitive GC analysis. Therefore, a protectant is needed to protect the analyte from any type of distortion for integration and to prevent overestimation. Existing solutions do not overcome these problems completely due to limitations. As the matrix enhancement problem originated from matrix components, its solution should come from similar components.

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Showing Results 21 - 30 of 127
Scientific News
Boy or Girl? Lemur Scents Have the Answer
A new study finds that a pregnant lemur’s signature scent depends in part on whether she’s carrying a girl or a boy.
Identification of Fumonisins in Corn
In this study, fumonisin A1, A2, and a3 are identified and quantified by high-resolution liquid chromatography-orbitrap mass spectrometry.
Ground-Breaking Lung Cancer Breath Test In Clinical Trial
University of Leicester and Leicester’s Hospitals to evaluate revolutionary device which detects lung cancer in early stages.
Pittcon Announces Wide Variety of Short Courses
Courses range from beginner and intermediate to advanced levels.
Saliva Test to Diagnose Autism
A spit test may one day be able to diagnose autism according to researchers at Clarkson University and the State University of New York at Plattsburgh.
Improved Accuracy of Pesticide Detection in Food
European Reference Laboratory improves accuracy of pesticide detection in food with AB SCIEX mass spectrometry instrumentation.
A Better Understanding of Earth’s Geological Evolution
New instruments to more precisely measure a uranium element carbon dating ratio of 238U/235U.
Insights Into A Rare Genetic Disease
Study shows mutation in NGLY1 gene is linked to a genetic disorder with severe consequences.
Researchers Study Cultural Heritage Painting Cross-Sections
Study of cultural heritage painting cross-sections using AFM-based nanoscale mass spectrometry technique.
Assessing Tumors During Surgery
A novel biomarker for mutant p53 could help pathologists assessing tumors during surgery.
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