Analysis of Degraded Polymethyl Methacrylate by UV Irradiation - MSTips 324 Polymers can be degraded by the effects of light, oxygen, heat, etc. so it is important to understand how the polymer structures change during degradation. Pyrolysis gas chromatograph quadrupole mass spectrometer (Py-GC-QMS) and matrix-assisted laser desorption/ionization time-of-flight mass spectrometer (MALDI-TOFMS) are powerful tools for analyzing polymeric materials. Py-GC-QMS is a method that instantaneously heats a sample with a pyrolyzer and then analyzes the pyrolysis products by GC-MS. Since most of the pyrolysis products are related to monomers and dimers, this technique allows for easy identification of the polymer substructures which is useful for identifying changes to the polymer when degradation occurs. MALDI-TOFMS involves a soft ionization technique that can directly ionize and analyze the intact polymer molecules and often produces singly-charged ions even for high molecular weight compounds. As a result, the m/z axis of the mass spectrum is equal to the mass of the ions, thus making it easy to interpret polymer distributions. Additionally, when MALDI is used with a high-resolution TOFMS, the accurate mass of each ion in the polymer series can be used to calculate their elemental compositions. Moreover, the molecular weight distribution of polymers can be calculated from the ion intensity distribution. In this work, we used Py-GC-QMS and high-resolution MALDI-TOFMS to evaluate the effects of UV irradiation on polymethyl methacrylate (PMMA). December 13, 2021 Application Note, GC Single-Quad MS, MALDI SpiralTOF™, Mass Spectrometry (MS) 0 Comment Read More >>
Insights into Dodecenes Produced from Olefin Oligomerization Based on Two-Dimensional Gas Chromatography–Photoionization–Time of Flight Mass Spectrometry and Multivariate Statistics Catalyzed light olefin oligomerization is widely used in petrochemical industries to produce fuels and chemicals. Light olefins such as propene and butenes are commonly selected as feedstocks. Solid phosphoric acid (SPA) and zeolite are representative acidic catalysts. Both the feedstocks and catalysts have an impact on the product composition. In this study, state-of-the-art instrumentation two-dimensional gas chromatography (GC × GC) coupled photoionization─time of flight mass spectrometry was employed to investigate the composition of dodecene products produced from olefin oligomerization. Information such as the olefin congener distribution, dodecene structural subgroup distribution, and individual dodecene isomers was obtained and utilized in the statistical analyses. By using specific data sets of the product composition, the distinguishment between SPA and zeolite catalysts as well as among the feedstocks was achieved by applying the unsupervised screening approaches (principal component analysis and hierarchical clustering analysis). The potential indicators of catalysts and feedstocks were selected by the feature selection methods (univariate analysis: analysis of variance and multivariate analysis: partial least squares-discriminant analysis). November 12, 2021 AccuTOF™ GC, Application Note, Mass Spectrometry (MS), MS Peer-Reviewed Articles 0 Comment Read More >>
Material Evaluation using msFineAnalysis - MSTips 330 As polymer materials have become more complex and diverse, the details of their chemical composition have become more critical for the end users. This knowledge allows manufacturers and users to understand the effects of incorporating these polymer materials into their products. Additionally, it is critical to also have tools that can quickly compare two-samples to each other like conventional materials versus alternative materials, new products versus old products, and good products versus defective products. September 3, 2021 AccuTOF™ GC, Application Note, Mass Spectrometry (MS), Materials, msFineAnalysis 0 Comment Read More >>
Dioxins analysis using GC-MS/MS and software "TQ-DioK" - MSTips38 Dioxins are a general term for polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs). Their structures consist of two chlorinated rings. Many congeners differ in terms of number of chlorine atoms and binding sites (Fig. 1). These substances are considered as persistent organic pollutants (POPS) due to their presence in the environment and the health risks associated. A World Health Organization (WHO) study has demonstrated the health risks (carcinogenic and immunotoxic) when population are exposed to them. In addition, dioxins have been regulated by the Stockholm convention on POPs in May 2001. In particular, 17 substances have to be monitored because they are regulated (7 PCDDs and 10 PCDFs). The highest toxic compound is the 2378-TeCDD. Currently, dioxins analysis can be done not only using GC-HRMS but also with GC-MS/MS according to European commission regulation (EU644/2017). Especially, GC-triple quadrupole MS is interesting in terms of handling, instrument size and operating costs. Recently, JEOL has developed a new GC-triple quadrupole MS (JMS-TQ4000GC) and a new dedicated dioxins analysis software called TQ-DioK. In this study, we evaluated JMS-TQ4000GC with TQ-DioK using dioxins standard samples. August 4, 2021 Application Note, GC Triple-Quad MS, Mass Spectrometry (MS) 0 Comment Read More >>
Analysis of Pesticides in Spinach using Triple-Quadrupole GC-MSMS Analysis of Pesticides in Spinach Purchased from Local Grocers Using Triple-Quadrupole GC-MS/MS Analysis June 22, 2021 Application Note, GC Triple-Quad MS, Mass Spectrometry (MS) 0 Comment Read More >>
Analysis of Pesticides in Kale using Triple-Quadrupole GC-MSMS Analysis of Pesticides in Kale Purchased from Local Grocers Using Triple-Quadrupole GC-MS/MS Analysis June 22, 2021 Application Note, GC Triple-Quad MS, Mass Spectrometry (MS) 0 Comment Read More >>
Analysis of Pesticides in Honey using Triple-Quadrupole GC-MSMS Analysis of Pesticides in Honey Using QuEChERS Extraction and Triple-Quadrupole GC-MS/MS Analysis June 22, 2021 Application Note, GC Triple-Quad MS, Mass Spectrometry (MS) 0 Comment Read More >>
MALDI-TOFMS imaging system JEOL×SCiLS Advanced statistical analysis of MALDI MS imaging data acquired by SpiralTOF™-plus while taking full advantage of its high mass-resolving power June 10, 2021 Application Note, MALDI Imaging, Mass Spectrometry (MS), Product Brochures (MS) 0 Comment Read More >>
Robust Terpene Analysis in Cannabis by Using Liquid Injection Terpenes are a classification of aromatic compounds that are nearly ubiquitous throughout nature. Terpenes are primarily found in plants, but can also be observed in marine organisms, insects, and, to a lesser extent, higher-order animals. They are present in cannabis in significant concentrations and are one of the most interesting and diverse aspects of cannabis. They provide the unique aroma of the plant and are critical to the cannabis experience; however, understanding the role that they play in the psychoactive experience of cannabis consumption is still not well understood. Terpenes themselves are built from repeating five-carbon units called isoprene. Their classification as a monoterpene, diterpene, etc., is dependent on the number of isoprene units in their structure. Terpene content in cannabis is typically not regulated, but can provide unique insights into the “flavor profile” of the cannabis flower. Demand for terpene testing has increased significantly in the past few years as consumers become increasingly interested in the terpene profiles of the cannabis strains they consume. Cannabis has a high abundance of mono- and sesquiterpenes, and the majority of terpenes present in the flower fall into these classifications. This study presents a comprehensive gas chromatography- mass spectrometry (GC-MS) method for the analysis of 22 terpenes in cannabis flower, with a focus on developing a rapid and robust method for the analysis of terpenes in a commercial laboratory. May 28, 2021 Application Note, GC Triple-Quad MS, Mass Spectrometry (MS) 0 Comment Read More >>
Identification of Impurities in an Expired Standard Drug Mixture by Using Multiple Ionization Methods and msFineAnalysis Gas chromatography combined with high-resolution time-of-flight mass spectrometry (GC-HRTOFMS) is a powerful tool for the analysis of complex mixtures. The AccuTOF GC-Alpha (JMS-T2000GC) mass spectrom-eter is fast, accurate and sensitive with high mass-resolving power and high mass accuracy. May 18, 2021 AccuTOF™ GC, Application Note, Environmental / Food, Mass Spectrometry (MS), msFineAnalysis 0 Comment Read More >>