Rapid classification of White Oak (Quercus alba) and Northern Red Oak (Quercus rubra) by using pyrolysis direct analysis in real time (DART鈩? and time-of-flight mass spectrometry

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• 作者：Robert B. Cody^a ; ^{cody@jeol.com} ; A. John Dane^a ; Benjamin Dawson-Andoh^b ; Emmanuel Oluwatosin Adedipe^c ; Kofi Nkansah^b
• 关键词：Ambient ionization ; Direct analysis in real time ; Time-of-flight ; Red oak ; White oak
• 刊名：Journal of Analytical and Applied Pyrolysis
• 出版年：2012
• 期刊代码：46_01652370
• 类别：ch
• 出版时间：May, 2012
• 卷：95
• 期：Complete
• 页码：134-137
• 文件大小：308 K

摘要

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.