Methanol sugar composition

Complexes of alkali metals and alkaline-earth metals with carbohydrates have been reviewed in this Series,134 and the interaction of alkaline-earth metals with maltose has been described.135 Standard procedures for the preparation of adducts of D-glucose and maltose with the hydroxides of barium, calcium, and strontium have been established. The medium most suitable for the preparation of the adduct was found to be 80% methanol. It is of interest that the composition of the adducts, from D-glucose, maltose, sucrose, and a,a-trehalose was the same, namely, 1 1, in all cases. The value of such complex-forming reactions in the recovery of metals from industrial wastes has been recognized. Metal hydroxide-sugar complexes may also play an important biological role in the transport of metal hydroxides across cell membranes. 

Rao and Chakraborty (1988) have studied the effects of solvent extractions on the chemical composition of tobacco. Water extractions significantly reduced the levels of nicotine, reducing sugar and polyphenols. Extractions with methanol reduced the content of solanesol, neophytadiene, hydrocarbons, and steroids. The solvent extractions did not alter the structural identity of the tobacco. There were no significant cellular changes. 

FIGURE 1.24 Composite adsorption isotherms for various samples of charcoal from sugar and coconut shell from methanol-benzene mixtures. Curves (a) original charcoals, (b) out-gassed at 400°C, (c) outgassed at 750°C, (d) outgassed at 1100°C. (After Puri, B.R., in Chemistry and Physics of Carbon, Vol. 6, P.L. Walker, Jr., ed., Marcel Dekker, New York, p. 191, 1970. With permission.)... 

FIGURE 3.17 Composite isotherms from methanol-benzene solutions on various charcoals. 0 1 = original sugar charcoal 2 = 1000°C outgassed sugar charcoal 3 = PVC charcoal A 4 = H202-treated sugar charcoal. (From Bansal, R.C. and Dhami, T.L., Carbon, 15, 153, 1977. With permission.)... 

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