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Chemical identification often relies on matching measured chemical properties and/or spectral "fingerprints" of unknowns against their precompiled libraries. Chromatography, absorption spectroscopy, and mass spectrometry are all among analytical approaches that provide chemical measurement databases amenable to library searching. Occasionally, using conventional single-library or single-domain searches can lead to miss-identification of unknowns. To improve chemical identification, we present a tandem gas chromatograph/vacuum ultraviolet-mass spectrometer (GC/VUV-MS) chemical identification approach that utilizes databases from GC chromatography, VUV spectroscopy, and mass spectrometry analyses for a "multi-domain" library search. Using standard chemical mixtures as well as aroma compounds as test cases, we demonstrate that multi-database library searches utilizing GC, VUV, and MS data, results in fully correct identification of chemical mixtures examined here that could only be identified with a 69.2% or an 88.5% success rate with MS or VUV library searches alone, respectively. Additionally, we introduce a library- and data domain-independent metric for evaluating the confidence of library search results. Using multi-domain library searches improves both the chemical assignment accuracy and confidence.
This article was published in the following journal.
Name: Analytical chemistry
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Lists of material available in a library arranged in order with bibliographical METADATA for the purpose of identification and retrieval.
Development of a library collection, including the determination and coordination of selection policy, assessment of needs of users and potential users, collection use studies, collection evaluation, identification of collection needs, selection of materials, planning for resource sharing, collection maintenance and weeding, and budgeting.
Collection and analysis of data pertaining to operations of a particular library, library system, or group of independent libraries, with recommendations for improvement and/or ordered plans for further development.
The use of automatic machines or processing devices in libraries. The automation may be applied to library administrative activities, office procedures, and delivery of library services to users.
A form of GENE LIBRARY containing the complete DNA sequences present in the genome of a given organism. It contrasts with a cDNA library which contains only sequences utilized in protein coding (lacking introns).