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Kuesel AC , Stoyanova R , Aiken NR , Li CW , Szwergold BS , Shaller C , Brown TR
Quantitation of resonances in biological P-31 NMR spectra via principal component analysis: Potential and limitations
Nmr in Biomedicine. 1996 May;9(3) :93-104
AbstractThis paper examines the potential and limitations of peak area quantitation of biological NMR spectra using principal component analysis (PCA), including its requirement for prior knowledge, The principles of the method are presented without in-depth mathematical treatment, PCA is illustrated for simulated data, P-31 NMR spectra obtained consecutively over 1- 2.5 days from perfused Rat-2 cells metabolizing the choline analogue phosphoniumcholine (Cho(p)) and in vivo proton- decoupled, NOE-enhanced, three-dimensional CSI localized P-31 NMR spectra of the liver of healthy volunteers, The results show that PCA can be used to quantitate strongly overlapping peaks without prior knowledge of the peak shapes or positions and to reconstruct spectra with significantly reduced noise variance, Two major limitations of PCA are presented: (1) PCA cannot separate peaks whose intensities are well correlated; (2) PCA is sensitive to differences in chemical shift and line- width of peaks between spectra, The discussion focusses on what knowledge of the biological and spectroscopic features of the samples and the principles of PCA is necessary for peak area quantitation via PCA.
NotesTimes Cited: 10 English Article VK944 NMR BIOMED