- Selective sensing of guanidinium and tetraalkylammonium ions using lipophilic cyclodextrins
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A range of lipophilic cyclodextrin derivatives, including 2,6-didodecyl-α and -β-cyclodextrins, and 2,3,6-tri-O-ethyl-β-cyclodextrin, has been examined as ionophores in electrode response studies of the detection of guanidine, alkylated guanidines, creatinine and several tetraalkylammonium ions including choline, acetylcholine and the long chain cationic surfactants CnH(2n+1)NMe3+ (n = 8 -> 16).Interference from Group Ia and IIa cations is minimal for alkylammonium ions (-log kpot > 4 typically) and in certain cases binding of the ion has been further defined by electrospray mass spectrometric and NMR methods.
- Kelly, Patricia M.,Kataky, Ritu,Parker, David,Patti, Antonio F.
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p. 1955 - 1964
(2007/10/03)
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- SYNTHESIS AND MASS SPECTRA OF 4-O-ACETYL-1,5-ANHYDRO-2,3,6-TRI-O-ETHYL-D-GLUCITOL AND THE POSITIONAL ISOMER OF 4-O-ACETYL-1,5-ANHYDRO-DI-O-ETHYL-O-METHYL-D-GLUCITOL AND 4-O-ACETYL-1,5-ANHYDRO-O-ETHYL-DI-O-METHYL-D-GLUCITOL
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Reductive cleavage of fully methylated, partially O-ethylated cellulose or fully ethylated, partially O-methylated cellulose and subsequent acetylation had previously been shown to produce 4-O-acetyl-1,5-anhydro-2,3,6-tri-O-methyl-, -6-Oethyl-2,3-di-O-methyl-, -3-O-ethyl-2,6-di-O-methyl-, -2-O-ethyl-3,6-di-O-methyl-, -2,3,di-O-ethyl-6-O-methyl-, -2,6-di-O-ethyl-3-O-methyl-, -3,6-di-O-ethyl-2-O-methyl-, and -2,3,6-tri-O-ethyl-D-glucitol.Described herein is the independent synthesis of these derivatives, except for the first (which had been reported); and their (1)H-n.m.r. spectra, chemical-ionization (NH3) mass spectra, and electron-impact mass spectra are tabulated.
- Zeller, Samuel G.,D'Ambra, Anello J.,Rice, Michael J.,Gray, Gary R.
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