To our knowledge this is the first approach to measure similarity between two multivariate entities based on joint probability density masses in selected points giving emphasis on both linear and probabilistic relations.
Knowledge of the exact mass shift is applicable for setting very narrow mass windows in selected reaction monitoring (SRM) experiments, yielding significantly increased selectivity of the determination [ 113], or for the verification of proposed biotransformation pathways [ 113].
The limits of quantification for the investigated compounds, using the presented extraction method followed by liquid chromatography/electrospray ionization mass spectrometry in selected ion monitoring mode, ranged from 0.05 to 0.1 μg mL−1 plasma.
Spectrometric detection was performed using a triple quadrupole mass spectrometer in selected reaction monitoring mode, monitoring for the individual m/ z transitions for each of the 10 PFCs and the C-PFOA surrogate.
Detection was performed using a triple quadrupole mass spectrometer in selected reaction monitoring mode, monitoring for the M/Z transitions of 10 individual perfluorocarbon compounds and an internal C-PFC standard corresponding to each target compound analyzed.
Spectrometric detection was performed using a triple quadrupole mass spectrometer in selected reaction monitoring mode, monitoring individual m/ z transitions for each of the target PFCs, the C-PFOA, C-PFOS, and C-PFDA surrogates and the C-PFOA and FOUEA (C-2H-perfluoro-2-decenoic acid) instrument internal standards.
We analyzed the extracts using GC-MS with a mass selective detector in selected ion monitoring mode (Agilent 6890N; Agilent Technologies Inc., Santa Clara, CA, USA).
The structure of the resulting 'hyperbranched' polyesters were characterized by 1H NMR spectroscopy, MALDI-TOF mass spectroscopy and in selected cases by SEC.
For diazinon and malathion, UCD used a gas chromatograph with a DB-17 capillary column and a quadrapole mass spectrometer operated in selected ion mode (CARB 1998b, 1999).
The di-ester derivative of BPA was extracted with isooctane followed by methyl t-butyl ether and analysed using an Agilent 6890 gas Chromatograph (GC) coupled to a 5975 mass selective detector (MSD) in selected ion-monitoring mode (ions m/z 213, 228, 270, 312, for BPA and 224 for BPA-d16).
