LC*GC

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COLUMNS

• COLUMN WATCH
  New Liquid Chromatography Columns and Accessories for 2019
  David S. Bell
  Our annual review of new liquid chromatography columns and accessories.
  
• LC TROUBLESHOOTING
  Reversed-Phase Liquid Chromatography and Water, Part II: Re-equilibration of the Stationary Phase Following Gradient Elution
  Dwight R. Stoll
  Re-equilibrating a reversed-phase stationary phase following aqueous gradient elution can be achieved much faster than you think.
  
• PERSPECTIVES IN MODERN HPLC
  New HPLC Systems and Related Products Introduced in 2018–2019: A Brief Review
  Michael W. Dong
  New HPLC and MS systems: A review of instrumentation trends and the current market along with new instruments, modules, chromatography data systems, and related software.
  
• FOCUS ON ENVIRONMENTAL ANALYSIS
  Trends in Water Analysis
  Laura Bush
  In this interview, Thomas Letzel of the Technical University of Munich considers the current state of water analysis, looking at recommended techniques, thegrowth of nontargeted screening, and multi-disciplinary collaboration.
  
• THE ESSENTIALS
  Electron Ionization in GC–MS
  We provide a succinct explanation of electron ionization for GC–MS and illustrate the fundamentals of ion formation.
  

FEATURE

• Data Integrity Focus, Part IV: Are Raw Data and Complete Data the Same?
  R.D. McDowall
  The meaning of the terms raw data and complete data are explored. One term is from EU GMPs and the other is from US GMPs. Do they mean the same thing?
  

PEER-REVIEWED ARTICLE

• Chromatography Fundamentals, Part VI: The Gaussian Distribution and Moment Analysis
  Howard G. Barth
  How well do Gaussian-shaped profiles represent injected solute peaks after they are eluted through a chromatographic column? This question is explored along with a discussion of moment analysis for determining retention time, variance, and shapes of peaks.
  

DEPARTMENTS

• Peaks of Interest
• Products & Resources
• Ad Index
• Calendar

RECENT DEVELOPMENTS IN SAMPLE PREPARATION

• Articles
  • Advancing Chromatographic Analysis Using Selective and Robust Sample Preparation
    Jared L. Anderson
    The field of sample preparation is undergoing revolutionary change, largely governed by the need for miniaturization while maintaining high selectivity and high analyte enrichment. How up-to-date are you in the advances of sample preparation for chromatographic analysis?
    
  • Dispersive Miniaturized Solid-Phase Extraction Using the CIM-81 Metal-Organic Framework and Gas Chromatography–Mass Spectrometry to Determine Personal Care Products in Waters
    Providencia González-Hernández, Ana B. Lago, Jorge Pasán, Juan H. Ayala, Ana M. Afonso, and Verónica Pino
    In this study, the analysis of contaminants found in environmental waters and originating from personal care products is addressed using metalorganic frameworks (MOFs) in combination with liquid chromatography (LC). This work expands the use of MOFs from gas chromatography to LC and also meets the requirements of green analytical chemistry.
    
  • Solid-Phase Microextraction Combined with Flow-Modulated Comprehensive Two-Dimensional Gas Chromatography for Screening Leachables in the Pharmaceutical Industry
    Juliana Crucello, Andre Cunha Paiva, and Leandro W. Hantao
    A simple, fully-automated method is proposed to analyze extractables and leachables—compounds that are released from packing materials into drugs during storage—using SPME-GC×GC–MS. This method avoids the use of sample preparation solvents and reduces sample handling, and is ideal for routine use in quality control.
    
  • Nanomaterials Have Come to Stay: An Overview of their Use as Sorbents in Sample Preparation
    Javier González-Sálamo, Diana Angélica Varela-Martínez, Carlos Cairós, Miguel Ángel González-Curbelo, and Javier Hernández-Borges
    Nanomaterials are extremely useful as sorbents for sample preparation, because of their varied morphologies, high surface area, surface-tovolume ratio, porosity, and ability to interact with samples in a variety of ways. Here, we review how nanomaterials are being used in a variety of sample preparation techniques, such as dispersive solid-phase extraction (dSPE), solid-phase microextraction, stir-bar sorptive extraction, and matrix solid-phase dispersion.
    
  • Exploring the Efficiency of Various Extraction Approaches for Determination of Crude (4-methylcyclohexyl)methanol (MCHM) Constituents in Environmental Samples
    Ronald V. Emmons, Amila M. Devasurendra, Nipunika H. Godage, and Emanuela Gionfriddo
    Crude (4-methylcyclohexyl)methanol (MCHM) is a chemical contaminant that must be monitored in fresh water environments, because of significant health risks to surrounding human populations. A new method for MCHM analysis was developed using solid-phase microextraction (SPME) and thin film microextraction (TFME) combined with GC–MS. Both methods achieved limits of quantitation lower than standard methods using SPE.
    
  • “Truly Natural”: Fully Automated Stir-Bar Sorptive Extraction with Enantioselective GC–MS Quantitation of Chiral Markers of Peach Aroma
    Cecilia Cagliero, Alessandro Guglielmetti, Chiara Cordero, Erica Liberto, Arianna Marengo, Barbara Sgorbini, Patrizia Rubiolo, and Carlo Bicchi
    A simple, automated, and fast method to quantify complex odorants in foods is described using stir-bar sorptive extraction (SBSE) combined with fast enantioselective GC–MS analysis. The total analytical method takes only 30 minutes and does not require any sample pretreatment.
    

COLUMNS

• COLUMN WATCH
  Perspectives on the Adoption and Utility of 1.0-mm Internal Diameter Liquid Chromatography Columns
  David S. Bell
  We assess the advantages and disadvantages of 1.0-mm diameter columns.
  
• LC TROUBLESHOOTING
  Looking for New Selectivity in Reversed-Phase Liquid Chromatography? A View of the Selectivity Landscape Over the Past Two Years
  Dwight R. Stoll
  How many new columns truly offer new selectivity?
  
• SAMPLE PREP PERSPECTIVES
  Recent Advances in Solid-Phase Microextraction, Part II: Bio-SPME
  Douglas E. Raynie
  Bioanalysis with SPME has advanced greatly over the past decade.
  

PEER-REVIEWED ARTICLES

• Data Integrity Focus, Part III: What Is the Problem with Hybrid Systems?
  R.D. McDowall
  A hybrid system is the worst possible choice for managing your regulated data.
  
• Instrument Considerations in the Transfer of Chromatographic Methods, Part III: Aligning Performance of Modules
  Thomas E. Wheat
  In method transfer, carefully aligning the modules of the two systems is essential.
  
• Determination of Diclofenac in Water Samples from Wastewater Treatment Plants by Large Volume Injection-Gas Chromatography–Mass Spectrometry
  Álvaro Aragón, Rosa M. Toledano, Ana Vázquez, Jesús Villén, and José M. Cortés
  A new method to analyze low concentrations of the drug diclofenac in wastewater.
  
• Pressure Tuning: Increasing the Flexibility of Comprehensive Two-Dimensional Gas Chromatography
  Mohammed Sharif Khan and Philip John Marriott
  Pressure tuning makes it easy to change the orthogonality in the 2D space.
  

THE LCGC AWARDS: INTERVIEWS

• The 2019 Lifetime Achievement in Chromatography Award: Professor Milos V. Novotny on His Chromatographic Journey
  Jerome Workman, Jr.
  Prof. Novotny discusses the joys of mentoring and the future of separation science.
  
• The 2019 Emerging Leader in Chromatography Award: Ken Broeckhoven on Investigating the Performance Limits of HPLC Separations
  Jerome Workman, Jr.
  Ken Broeckhoven explains his pursuit of ever higher performance in HPLC.
  

DEPARTMENTS

• Peaks of Interest
• ISCC and GCxGC Preview: Honey I Shrunk the HPLC.
• Calendar
• Short Courses
• Products & Resources
• Ad Index
• The Essentials

Current Trends in MASS Spectrometry

• Articles
  • Plant Metabolomic Workflows Using Reversed-Phase LC and HILIC with ESI-TOF-MS
    Rofida Wahman, Johanna Grassmann, Peter Schröder, and Thomas Letzel
    In plant metabolomics, molecular fingerprints and additional molecular descriptors can be identified using recent developments in polarity-extended separations with serial coupling of reversed-phase LC and HILIC combined with ESI-TOF-MS.
    
  • A Robust and Sensitive Method for Detecting Glyphosate and Other Polar Pesticides in Food and Water: Multiple Analytes in a Single Injection without Derivatization
    Wim Broer, Ugo Chiuminato, Jianru Stahl-Zeng, Daniel McMillan, and Phil Taylor
    A new high-throughput LC–MS/MS method meets the challenge of eliminating matrix effects for monitoring, with high specificity, polar organic pesticides such as glyphosate in food and water, while meeting targeted limits of detection.
    
  • GC×GC–MS for Forensic Analysis
    Candice M. Bridge, Mark Maric, and Kaitlin Jones
    Forensic scientists often encounter highly complex analytical problems related to crime scenes that would benefit from the capabilities of GC×GC–MS. However, this technique has not been fully explored to help benefit forensic laboratories.
    
  • The Benefits of Data-Independent Acquisition in Metabolomics
    Alasdair Matheson
    Data-independent acquisition (DIA) makes it possible to re-interrogate data from earlier analyses to determine if new compounds have appeared in a sample previously analyzed. In this interview, Craig Wheelock of the Karolinska Institute discusses the use of DIA in metabolomics.
    
• Departments
  • Products
  • Ad Index

COLUMNS

• LC TROUBLESHOOTING
  Reversed-Phase Liquid Chromatography and Water, Part I: How Much is Too Much?
  Dwight R. Stoll
  In reversed-phase separations, retention generally increases as the fraction of water in the eluent increases. When we encounter situations where retention is too low for an analyte of interest, we tend to use eluents with higher and higher levels of water. But how much water is too much?
  
• GC CONNECTIONS
  GCxGC: From Research to Routine
  Nicholas H. Snow
  Two-dimensional gas chromatography (GCxGC) is becoming the technique of choice for analysis of highly complex samples such as petroleum, pharmaceuticals, biological materials, food, flavors, and fragrances. Here, we explain how GCxGC works and provide examples that illustrate its advantages.
  
• THE ESSENTIALS
  Optimizing Sensitivity in GC–FID Analysis
  It is often possible to achieve better sensitivity and lower limits of detection and quantitation using standard gas chromatography instrumentation. Paying attention to fundamental variables—like sample solvent, initial oven temperature hold, carrier gas operating mode, and thermal gradients— can lead to much improved method performance.
  

FEATURE ARTICLES

• The 2019 LCGC Awards
  Jerome Workman Jr.
  The contributions of Milos V. Novotny and Ken Broeckhoven, the winners of the 2019 LCGC Lifetime Achievement and Emerging Leader in Chromatography Awards, are presented.
  
• Data Integrity Focus, Part II: Using Data Process Mapping to Identify Integrity Gaps
  R.D. McDowall
  Data integrity is paramount when working in a regulated environment. Data process mapping is an excellent way to identify and mitigate data gaps and record vulnerabilities in a chromatographic process. This approach is simple and practical.
  

THE APPLICATION NOTEBOOK

DEPARTMENTS

• Peaks of Interest
• Products & Resources
• Ad Index

COLUMNS

• SAMPLE PREP PERSPECTIVES
  Is Headspace Sampling Quantitative?
  Douglas E. Raynie
  Whether or not headspace sampling is quantitative depends on the information gleaned from the analysis.
  
• LC TROUBLESHOOTING
  What’s Trending in LC Troubleshooting?
  Dwight R. Stoll
  We look at problems in LC that can be traced to contaminated solvents or reagents, and how sample solvent effects can lead to poor performance in HILIC.
  
• GC CONNECTIONS
  Stopping GC and GC–MS Problems Before They Start
  Nicholas H. Snow
  By taking simple proactive troubleshooting steps, GC users can ensure that instruments will operate correctly over time, thus avoiding workflow disruptions.
  
• FOCUS ON BIOPHARMACEUTICAL ANALYSIS
  Methods and Purposes for Determining Higher Order Structures of Biopharmaceuticals
  J. Auclair, A. Rathore, and Ira S. Krull
  Determining the higher order structure of a protein pharmaceutical is important. Here, we review the approaches for HOS determination that are currently receiving the most attention in the literature and at scientific meetings.
  
• THE ESSENTIALS
  Essential Theory of HPLC
  The elution mechanisms for gradient and isocratic HPLC are fundamentally different from each other. Here is what you should understand about both.
  

FEATURE ARTICLE

• Data Integrity Focus, Part 1: Understanding the Scope of Data Integrity
  R.D. McDowall
  There are many factors to consider in a data integrity and governance program. Fortunately, a simple diagram can help us understand what needs to be covered.
  

PEER-REVIEWED ARTICLE

• Suspect Screening of Chemicals in Food Packaging Plastic Film by Comprehensive Two-Dimensional Gas Chromatography Coupled to Time-of-Flight Mass Spectrometry
  Yelena Sapozhnikova and Eunha Hoh
  The occurrence of additives like plasticizers in plastic food packaging has been documented, but information on their potential migration into foods is limited. In this pilot study, 2D GC–MS was used to identify chemicals extracted from a common stretch plastic film with a series of organic solvents. In total, 91 compounds were tentatively identified, including five PCBs.
  

DEPARTMENTS

• Peaks of Interest
• Products & Resources
• Calendar
• Short Courses
• Ad Index