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EAS Abstracts 2016.Indd eas.org Analytical ABSTRACT BOOK Chemistry Opens Doors 2016 EASTERN ANALYTICAL SYMPOSIUM & EXPOSITION Garden State Exhibit Center Somerset, NJ November 14–16, 2016 CALL FOR PAPERS ORAL abstract submission POSTER March 1 - May 15 abstracts 2017 submission March 1 - Sept 12 2017 Building Your Analytical Future 2017 Eastern Analytical Symposium & Exposition Crowne Plaza Princeton – Conference Center Plainsboro, NJ November 13 15, 2017 We invite YOU to be a part of the technical program by contributing a paper for oral or poster consideration. Visit www.eas.org for more details eas.org eas.org 10/11/16 1:18 PM 10/11/16 1:18 PM 2016 EAS Abstracts November 2016 2016 EAS Abstracts This volume contains the final abstracts for the oral and poster presentations which take place Monday, November 14, through Wednesday, November 16, 2016. If an abstract is not provided in this volume or the Addendum, then the presenting author did not supply an abstract. For each abstract provided, a complete mailing address for the presenting author is shown. Additional authors are indicated, however, their mailing addresses are not provided. Schedule and meeting room information for the technical sessions, as well as information concerning short courses, exhibitor workshops, and the exposition, are contained in the Final Program Book. More Information To obtain answers to EAS-related questions after the meeting: EAS Hotline 732-449-2280 EAS E-mail [email protected] EAS Web Site www.EAS.org Eastern Analytical Symposium & Exposition, Inc. P.O. Box 185 Spring Lake, NJ 07762 N N A ALY ER T T IC S A A L E S Y N M O P I T O I SI S U PO M & EX Save the Date The 2017 EAS November 13 - 15, 2017 Crowne Plaza Princeton – Conference Center Plainsboro, NJ We want you to be a part of the 56th Eastern Analytical Symposium! 2017 Call for Papers March 1 – May 16, 2017 1 2016 EAS Abstracts November 2016 ABSTRACTS OF TECHNICAL PAPERS 1 Multidimensional Gas Chromatography: Do More Acronyms Really mirrors on each side of a measurement cell, was proposed in 1987. This leads Give Better Analysis? to greatly increased effective pathlengths at low absorbance levels. Interferometric Nicholas H. Snow, Seton Hall University, 400 South Orange Ave., South principles were originally applied incorrectly to derive the transmission behavior. Orange, NJ 07079 In 1988 O’Keefe introduced Cavity Ring Down and in 1998 extended it to contin- Today’s gas chromatographic methods often include multiple dimensions of sep- uous wave (CW) measurements using the same arrangement proposed in 1987. aration that can both help and hinder the separation and analysis. New detection O’Keefe’s derivations of transmission behavior are also approximate. We show that technologies, such as tandem mass spectrometry (MS-MS) and VUV, which com- the limiting gain is ~1/(1-R), R being mirror reflectance. We further show how to bined with new column technologies such as gas chromatography (GC)xGC and attain substantial gain in detection limits by this technique in a very simply and inex- IL columns and selective sample preparation can generate up to six dimensions. pensively. Broadband cavity enhanced absorption spectroscopy is only now coming While this adds considerably to the achievable separation power, it adds similarly into being although the feasibility was shown 25 years ago. to the chemistry that must be understood and applied by the analyst. For example, an solid-phase microextraction (SPME)-GCxGC- time-of-flight (ToF)MS analysis 5 Utilizing NIRS When the Analyte is Obscure includes the full six dimensions; each has the potential to either aid or disrupt the Samuel Coleman, ColeSpec Solutions, 138 Deer Chase Ct., Azle, TX separation: sampling, extraction, injection, two dimensions of GC and MS detec- 76020 tion. Examples from pharmaceutical and organic contaminant analysis are used to Since near-infrared spectroscopy (NIRS) is the measurement of absorbed energy examine multi-dimensional separations in terms of the selectivity that can both be from specific vibrating bonds, the more specific and precise the chemical analyte obtained and lost as dimensions are added or if any, such as the injection technique determined in the reference laboratory, the greater the relationship between labo- are not fully understood or optimized. In gas chromatography, additional dimensions ratory values and spectral measurements. In the agricultural field we notice this by of separation provide both more capability and more challenge: more dimensions comparison of the relationship of nitrogen (or crude protein) content as compare may not always be better. to fibrous analytes such as acid-detergent or neutral-detergent fiber, both of which are much less chemically defined than nitrogen. Yet successful NIRS equations 2 Advances in the Application of Vacuum Ultraviolet Spectroscopic have been developed for the fibrous analytes as well as other ill-defined, chemically Detection for Gas Chromatography speaking, constituents. When it comes to bioassays, which comprise the more inter- Kevin A. Schug, The University of Texas-Arlington, Box 19065, 700 esting and useful assays for feeds and forages, the chemical representation is even Planetarium Pl., Arlington, TX 76019, Changling Qiu, Ling Bai, Jamie more obscure. The determinant is often an interaction of feed chemistry and the Schenk, Jonathan Smuts, Phillip Walsh, Harold M. McNair, Jack Cochran animal that eats and digests it. For ruminant animals, such as a cow or sheep, the Vacuum ultraviolet (VUV) absorption spectroscopy is a new tool for gas chroma- situation is more complex because microflora contained in the gastrointestinal tract, tography (GC) detection. It provides means for qualitative speciation, as well as particularly the rumen, are the primary processors, and their interaction with the quantitation, of volatile and semi-volatile organic compounds. The VUV detector host animal influences digestion and absorption of nutrients. For voluntary intake, measures gas phase absorption in the 120 – 240 nm wavelength region, where all one of the more important entities for determining growth and efficiency, the animal molecules absorb and have unique spectral signatures. GC- VUV complementary exerts a significant role the amount eaten, and the feedstuff and its chemistry largely to mass spectrometry and provides improved means for detecting low molecular function as constraints. We examine some of these obscure analytes and present weight, isomeric, and labile species. Because of the well characterizable VUV ab- a case for a functional NIRS relationship, even though the goodness of fit statistics sorption signature of molecules, some interesting qualitative and quantitative treat- may suggest otherwise. ments are possible. Co-eluting compounds for which VUV reference library spectra are available can be easily deconvoluted into individual response signals. In fact, 6 Routine and Non-Routine Use of NIR Spectroscopy in Forage Crop a more comprehensive time interval deconvolution (TID) procedure for automated Analysis speciation and classification of compounds eluted during a chromatographic run is Craig Roberts, University of Missouri, 108 Waters Hall, Columbia, MO now possible. TID has been applied to both gasoline PIONA and Aroclor polychlo- 65211 rinated biphenyl classification analyses. Further, the potential for pseudo-absolute Forage crops, sometimes called “forages,” are plants that support livestock produc- quantitation will be discussed. Because the absorption cross-section is a physical tion. Analysis of forages by near-infrared (NIR) spectroscopy can be daunting. As property for a given molecule, it is possible to delineate exactly how many molecules this presentation explains, forage samples present an extremely diverse matrix and give rise to an absorption event for that molecule in the flow cell, if all other variables are subjected to a wide array of direct and indirect measurements. The diverse ma- are known. This provides some interesting possibilities for system diagnostics and trix is the result of multiple species that include annuals and perennials, warm-sea- calibrationless quantitation, which is also demonstrated. son and cool-season plants, as well as grasses and legumes. The diverse matrix is also affected by these species being planted in mixtures, harvested several times 3 Designing Flow-Based Unit Operations for Sample Prep during the year, and grown in different environments. The wide array of measure- Graham D. Marshall, Global FIA, Inc., 684 Sixth Ave., Fox Island, WA ments includes routine analysis for nutritive value, known as “quality components,” 98333, David J. Holdych, Don C. Olson such as fiber, protein, and digestibility. Measurements also include “antiquality com- A review of flow-based analysis literature will quickly reveal that most papers are ponents,” such as tannins, toxins, and molds. In addition, forage measurements focused on the actual measurement: chemistry, hardware, optimization studies, etc. include physiological, morphological, taxonomic, and genetic traits. To address the Few papers have been devoted to the use of flow-based sample manipulation for difficulties of using NIR technology in forage crop analysis, American scientists sample preparation. In many instances these steps are manual. A notable exception formed various collaborative organizations. As discussed in another presentation, is the work of Prof. Purnendu Dasgupta who has pioneered several novel pieces of United States Department of Agriculture researchers
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