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METHOD DEVELOPMENT FOR THE SIMULTANEOUS DETERMINATION OF METHYLMERCURY AND INORGANIC MERCURY IN SEAFOOD
Sergio Carneado, Ariane V. Zmozinski, Carmen Ibáñez-Palomino, Àngels Sahuquillo, José Fermín López-Sánchez, Márcia M. da Silva

This work reports the method development for the simultaneous determination of methylmercury (MeHg+) and inorganic mercury (iHg) species in seafood. The study focused on the extraction and quantification of MeHg+ by liquid chromatography coupled to on-line UV irradiation and cold vapour atomic fluorescence spectroscopy (LC-UV-HG-AFS), using HCl 4 mol L-1 as extractant agent.

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Application of Central Composite Design (CCD) for the Optimization of Ultrasound-assisted Extraction (UAE) of Phenolics from Corn (Zea mays)
Widiastuti Setyaningsih, 1,2 Erwan Duros, 3 Ceferino Carrera, 4 Miguel Palma, 2 Carmelo G. Barroso 2

A new Ultrasound-assisted Extraction (UAE) of phenolic compounds from corn (Zea mays) has been optimized by means of chemometrics tool. The proposed method was validated and successfully applied to the analysis of phenolics content in several corn cultivars.

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The Longest Way Round is the Shortest Way Home: HTS Assay Development for Complex Multi-domain Protein Kinases
Doris Hafenbrandl, Vanessa Nardese, Maria Cristina Sidoli, Valeria Wanke, Mariantonietta Rubino and Daniele Carettoni

This study strongly supports the possibility to overcome the major bottlenecks in the production of long kinase recombinant forms, in order to perform drug discovery programmes with proteins more closely preserving the structural and functional properties of the native enzymes.

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Amino-Coated Metallofullerene Nanoparticles for Glioblastoma Mutiforme Tumor Detection
Tinghui Li , Susan. Murphy, Kanwarpal Bakshi, Steven LaConte, Zhi Sheng, and Harry Dorn

We report the preparation of a new functionalized trimetallic nitride endohedral metallofullerene, with a cage surface consisting of positively charged amino groups, which is expected to bind more efficiently to negatively charged cell phospholipid bi-layer cellular surfaces and will more readily undergo endocytosis. We now report that this Gd-nanoplatform when subsequently conjugated with an IL-13 peptide, (IL-13-Gd3N@C80(OH)x(NH2)y) exhibits enhanced targeting of U-251 GBM cell lines.

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Significant Increase of Sensitivity on Rapid Influenza Antigen Assays Using Silver Amplification Immunochromatography.
Satoshi KIMURA1), Hideyoshi OHTO2), Hayato YAMAGUCHI1), Seiji FUKUOKA1), Emiko NAKAMA1), Akiko TERADA3), and Yoh UMEDA2)

We have developed a new rapid bed-side assay system for in vitro diagnosis of infectious diseases, using “silver amplification method”, an application of photography-developing technology. The automatic analyzer brings results in fifteen minutes, enhancing sensitivity up to 1000 times compared to the conventional immunochromatography. We applied the technology for diagnosis of hospitalized children. The analyzer was useful for rapid and precise diagnosis of influenza A and B.

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MsCompare: An Untargeted LC & GC/MS Metabolomics Platform for Quality Control, Precise Deconvolution and Data Analysis
Marco Ruijken

A GC/MS or LC/MS workflow for Metabolomics applications includes a number of distinct steps: experimental design, sampling, sample preparation, data acquisition, data processing, deconvolution, identification and data interpretation.

The MsXelerator software includes Quality Control procedures and Analysis of Variance (ANOVA) to properly control each step in this workflow and to obtain reliable results for both quantitation and identification.

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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 1 - 10 of 63
Scientific News
Proteomics for Systems Toxicology
MS-based proteomics is maturing into a robust technology for the measurement of proteome-wide exposure effects.
Photodynamic Therapy as a Novel Treatment for Halitosis in Adolescents
Researchers evaluated the use of photodynamic therapy for halitosis by analysing volatile sulfur compounds using gas chromatography.
Mass Spec Sample Prep Cut From Days to Minutes
The method, developed by Livermore scientists, accommodates liquid samples and bypasses the graphitization process, enabling sample preparation and analysis in minutes.
Device Could Detect Vapors In Room, Environment or a Person’s Breath
Researchers have received an NSF grant to build a handheld device to analyze a person’s breath and reveal whether certain dangerous gases are present that need more immediate medical attention.
Cracking the Mysteries of Walnut Research
Researchers with North Carolina State University’s Plants for Human Health Institute have developed a unique methodology for exploring walnut phytochemicals.
Single-Step Isolation of Extracellular Vesicles by SEC
Researchers from the University of Amsterdam have developed a single-step protocol to isolate vesicles from human body fluids.
Detecting Pharmaceutical and Personal Care Products in Water
A simple, more convenient method than conventional guidelines.
A Novel Method for Portable Detection of Potent Drugs Known as ‘Bath Salts’
Researchers developed a low-cost, disposable and rapid platform for detecting bath salts.
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).
Salamander Skin Peptide Promotes Wound Healing in Mice
New research suggests that the peptide tylotoin exerts the promotion of wound healing with epidermal growth factor in a murine model of a full thickness dermal wound.
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