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EDX and LIBS Studies on Gallstones Using Partial Least Squares Discriminant Analysis (PLS-DA)

Understanding gallstone formation requires examining their elemental composition. Here, EDS and LIBS were used with PLS-DA to quantify elements found in human gallstones.

Durgesh K. Tripathi

The enhanced resolution of comprehensive two-dimensional gas chromatography (GCxGC) was combined with the increased resolving power, speed, and mass accuracy of the Pegasus® HRT's mass analyzer to confidently characterize molecules in light cycle oil (LCO) and vacuum gas oil (VGO). Optimized chromatographic and mass spectrometry parameters were implemented to improve data acquisition, processing, and heteroatomic speciation of these light to midlevel petroleum fractions. Software tools were utilized to process the data and facilitate robust compound identifications. GCxGC-HRT data was processed using comprehensive Peak Find and resulted in comprehensive characterization of molecules in LCO and VGO samples. Compound classes consisted of, but were not limited to alkanes, cycloalkanes, aromatics, benzothiophenes, and carbazoles. Selective processing of alkylbenzothiophenes and dibenzothiophenes was conducted by retrospectively processing data using rapid two-dimensional, accurate mass Target Analyte Finding (TAF).

Christopher Utzat

Steven Lowry

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Tracking Microplastics in the Environment via FT-IR Microscopy

Microplastics from clothing, abrasive action on plastics, or engineered microbeads as found in some exfoliating cosmetics are showing up in many environmental systems. FT-IR microscopy is a useful tool in the analysis of microplastics, providing visual information, particle counts, and particle identification.

Suja Sukumaran

Latest:

Tracking Microplastics in the Environment via FT-IR Microscopy

Microplastics from clothing, abrasive action on plastics, or engineered microbeads as found in some exfoliating cosmetics are showing up in many environmental systems. FT-IR microscopy is a useful tool in the analysis of microplastics, providing visual information, particle counts, and particle identification.

M.C. Ortiz

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Assessing False Noncompliance and False Compliance with Limits Stated for Physicochemical Parameters in Red Wines Using a MIR-PLS Model

When analytical techniques that depend on multivariate calibration models are used to analyze commercial products, the risks of false compliance and noncompliance must be assessed. This study presents an example from the application of a mid-IR partial least squares model to the analysis of seven parameters in red wine.

M.E. Meléndez

Latest:

Assessing False Noncompliance and False Compliance with Limits Stated for Physicochemical Parameters in Red Wines Using a MIR-PLS Model

When analytical techniques that depend on multivariate calibration models are used to analyze commercial products, the risks of false compliance and noncompliance must be assessed. This study presents an example from the application of a mid-IR partial least squares model to the analysis of seven parameters in red wine.

M.S. Sánchez

Latest:

Assessing False Noncompliance and False Compliance with Limits Stated for Physicochemical Parameters in Red Wines Using a MIR-PLS Model

When analytical techniques that depend on multivariate calibration models are used to analyze commercial products, the risks of false compliance and noncompliance must be assessed. This study presents an example from the application of a mid-IR partial least squares model to the analysis of seven parameters in red wine.

L.A. Sarabia

Latest:

Assessing False Noncompliance and False Compliance with Limits Stated for Physicochemical Parameters in Red Wines Using a MIR-PLS Model

When analytical techniques that depend on multivariate calibration models are used to analyze commercial products, the risks of false compliance and noncompliance must be assessed. This study presents an example from the application of a mid-IR partial least squares model to the analysis of seven parameters in red wine.

D.J. Fyfe

Tory Woolf

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Fast Quality Evaluation of Bulk Polymers and Products Using FT-NIR Spectroscopy

FT-NIR spectroscopy for the quantitative determination of key physical parameters in bulk polymers and products, including density and melt index (MI). These measurements can often be made with little or no sample preparation.

Nara de Matos Granja

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Looking Below the Surface of Breast Tissue During Surgery

In this article, we present a method that provides prompt detection of the presence of cancer cells inside the 2-mm margin of tissue surrounding the tumor after excision using spatially offset Raman spectroscopy (SORS). SORS was developed to detect subtle changes in soft tissue spectra in the 100–2000 ?m range and tested on excised breast tissues. The results display a very high specificity and sensitivity (100% and 95%, respectively) of classification between positive and negative tumor margins. SORS is a clinically feasible method, suitable for the real-time, intraoperative assessment of tumor margins at the micrometer level.

Frank Higgins

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Agilent Cary 630 Laboratory FTIR and Agilent 4500 Portable FTIR Systems for Detection of Counterfeit Pharmaceuticals

This application note demonstrates the effectiveness of Agilent compact and portable FTIR systems for detecting counterfeit pharmaceuticals with three examples: ethambutol hydrochloride, cephuroxime axetil, and atorvastatin calcium.

Horiba Scientific

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2D Fluorescence for Bioprocess Measurement/Control Analysis

Read about the potential of 2D fluorescence excitation-emission matrix (EEM) spectroscopy as a tool being used to characterize bio-process samples.

Syft Technologies Inc

Wei Hong