Grouping of complex substances using analytical chemistry data: A framework for quantitative evaluation and visualization


Autoři: Melis Onel aff001;  Burcu Beykal aff001;  Kyle Ferguson aff003;  Weihsueh A. Chiu aff003;  Thomas J. McDonald aff004;  Lan Zhou aff005;  John S. House aff006;  Fred A. Wright aff006;  David A. Sheen aff008;  Ivan Rusyn aff003;  Efstratios N. Pistikopoulos aff001
Působiště autorů: Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX, United States of America aff001;  Texas A&M Energy Institute, Texas A&M University, College Station, TX, United States of America aff002;  Department of Veterinary Integrative Biosciences, Texas A&M University, College Station, TX, United States of America aff003;  Department of Environmental and Occupational Health, Texas A&M University, College Station, TX, United States of America aff004;  Department of Statistics, Texas A&M University, College Station, TX, United States of America aff005;  Bioinformatics Research Center, North Carolina State University, Raleigh, NC, United States of America aff006;  Departments of Statistics and Biological Sciences, North Carolina State University, Raleigh, NC, United States of America aff007;  Chemical Sciences Division, National Institute of Standards and Technology, Gaithersburg, MD, United States of America aff008
Vyšlo v časopise: PLoS ONE 14(10)
Kategorie: Research Article
doi: 10.1371/journal.pone.0223517

Souhrn

A detailed characterization of the chemical composition of complex substances, such as products of petroleum refining and environmental mixtures, is greatly needed in exposure assessment and manufacturing. The inherent complexity and variability in the composition of complex substances obfuscate the choices for their detailed analytical characterization. Yet, in lieu of exact chemical composition of complex substances, evaluation of the degree of similarity is a sensible path toward decision-making in environmental health regulations. Grouping of similar complex substances is a challenge that can be addressed via advanced analytical methods and streamlined data analysis and visualization techniques. Here, we propose a framework with unsupervised and supervised analyses to optimally group complex substances based on their analytical features. We test two data sets of complex oil-derived substances. The first data set is from gas chromatography-mass spectrometry (GC-MS) analysis of 20 Standard Reference Materials representing crude oils and oil refining products. The second data set consists of 15 samples of various gas oils analyzed using three analytical techniques: GC-MS, GC×GC-flame ionization detection (FID), and ion mobility spectrometry-mass spectrometry (IM-MS). We use hierarchical clustering using Pearson correlation as a similarity metric for the unsupervised analysis and build classification models using the Random Forest algorithm for the supervised analysis. We present a quantitative comparative assessment of clustering results via Fowlkes–Mallows index, and classification results via model accuracies in predicting the group of an unknown complex substance. We demonstrate the effect of (i) different grouping methodologies, (ii) data set size, and (iii) dimensionality reduction on the grouping quality, and (iv) different analytical techniques on the characterization of the complex substances. While the complexity and variability in chemical composition are an inherent feature of complex substances, we demonstrate how the choices of the data analysis and visualization methods can impact the communication of their characteristics to delineate sufficient similarity.

Klíčová slova:

Analytical chemistry – Crude oil – Data processing – Data visualization – Fuels – Gas chromatography-mass spectrometry – Petroleum – Motor oil


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