Acetal-/3,/3-diglucosides

A rapid technique for the identification of surfactants in consumer products by ESI-MS was proposed by Ogura and co-workers [6], After a simple preparation procedure, infusion of the sample, which was prepared in a water/methanol mixture (50 50) containing 10 mM ammonium acetate, allowed assignment of the [M + NH4]+ ions of Cio- and Ci2-mono- and -diglucoside in the mass spectrum (ion masses as in Table 2.7.1). The approach even permitted quantitative analysis when deuterated internal standards were used. 

Acetal-fi, fi-diglucosides.1 In the presence of trimethylsilyl triflatc, trimcthylsilyl-2,3,4,6-tetra-Oacetyl-/ -l)-glucopyranosidc (1) reacts with aldehydes at —78° to form acetal-/, /3-diglucosides 2 in 30-85% yield. At higher temperatures, mixtures of acctal-/, / -, a,)3-, and a, a-diglucosides arc obtained. The yields arc dependent on the reactivity and steric bulk of the aldehyde. Ketones do not undergo this reaction. 

Alkyl mono- and diglucosides separation from each other and from butylmonoglucoside determination in formulations Silica gel HPTLC plate 60 40 5 CHClj/EtOH/HzO Lead (IV) acetate/2,7-dichloro-fluorescein, dried 3 min at 100-C fluorescence with 366 nm excitation 71... 

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