Abstract
Polyglycerol intermediates have been characterized by liquid chromatography-mass spectrometry (LC-MS) with electrospray ionization (ESI). Linear and cyclic components from n=2–23 in a sample of decaglycerol, for example, have been resolved in the second dimension or mass axis. Molecular weight (MW) distributions for tri-, hexa-, and decaglycerol products have been analyzed as a function of cone voltage and adduct ion (H+, Li+, Na+, K+, Rb+, Cs+, and NH4 +). A different combination is required to obtain a reliable MW distribution for each polyglycerol intermediate. The best distribution obtained by ESI/MS is determined by comparing the calculated hydroxyl number and cyclic content to that obtained by wet chemistry and gas chromatography, respectively. Once ESI/MS conditions are established, the distribution can be used, for the first time in polyglycerol analysis, to calculate important parameters such as number average MW, weight average MW, polydispersity, % cyclics, hydroxyl number, wt% above n=6, etc.
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Crowther, M.W., O’Connell, T.R. & Carter, S.P. Electrospray mass spectrometry for characterizing polyglycerols and the effects of adduct ion and cone voltage. J Amer Oil Chem Soc 75, 1867–1876 (1998). https://doi.org/10.1007/s11746-998-0343-x
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DOI: https://doi.org/10.1007/s11746-998-0343-x