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β- C -Glycoside ketone derivatives of glucose, lactose, and maltose were converted to amines via a reductive amination using 5 wt % Rh/Al 2 O 3 in ammoniacal methanol under 34 bar H 2 . The amines were isolated and then were used as the amine in the reductive amination of 2-undecanone that can be prepared from the seed oil of Cuphea . The resulting β- C -glycoside-2-aminoundecanes were characterized by MALDI-TOF mass spectrometry and 2D NMR. The critical micelle concentrations of the products as measured by isothermal calorimetry titration ranged from 1 to 5 mM, and the micelles carry a positive charge as measured by zeta potentials. The β- C -glycoside 2-aminoundecanes have antimicrobial activity against Bacillus subtilis, Pseudomonas aeruginosa, Erwinia amylovora, and Escherichia coli, with the C -glucoside derivative having the greatest activity with a minimum inhibitory concentration of 0.31 mM and a minimum bactericide concentration of 0.62 mM against the Gram positive organisms. Against the Gram negative Erwinia and Escherichia, the MIC is 0.62 mM. This work introduces a new family of sustainable surfactants with potential uses in personal care and cleaning products.
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Jackson et al. (2021) studied this question.
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