Rapid classification of White Oak (Quercus alba) and Northern Red Oak (Quercus rubra) by using pyrolysis direct analysis in real time (DART™) and time-of-flight mass spectrometry |
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| Institution: | 1. EDF R&D, Département Mécanique des Fluides, Energies et Environnement, 6 quai Watier, 78401 Chatou Cedex, France;2. EDF R&D, Laboratoire National d''Hydraulique et Environnement, 6 quai Watier, 78401 Chatou Cedex, France;3. CEREA, Joint Laboratory École des Ponts ParisTech/EDF R&D, Université Paris Est, 77455 Marne-la-Vallée, France;1. Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes, 748, Cidade Universitária, 05508-000, São Paulo, SP, Brazil;2. Museu de Arte Contemporânea da Universidade de São Paulo, Rua da Reitoria, 160, Cidade Universitária, 05508-050, São Paulo, SP, Brazil |
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| Abstract: | Thirty-four samples of Red Oak (Quercus rubra) and fifty samples of White Oak (Quercus alba) were analyzed by pyrolytic direct analysis in real time (DART) ionization coupled with time-of-flight (TOF) mass spectrometry. Although significant differences were not observed in the positive-ion mass spectra, the negative-ion mass spectra showed clear differences. Principal component analysis (PCA) and linear discriminant analysis (LDA) were calculated for the relative abundances of 11 peaks in the negative-ion mass spectra including peaks tentatively assigned as representing deprotonated acetic, malic, gallic, dimethoxycinnamic, and ellagic acids. Leave one out cross validation (LOOCV) was 100% successful in classifying the samples for both PCA and LDA. |
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