laevulosanlevulosann.

/ˈliːvjʊləsan/

Forms: Also laevulosane (see next).

Etymology: < French lévulosane (A. Gélis 1860, in Compt. Rend. LI. 333), < lévulose laevulose n.

Chemistry.

a. An anhydride, C₆H₁₀O₅, of lævulose. ? Obsolete.

ΚΠ

1862 H. Watts tr. L. Gmelin Hand-bk. Chem. XV. 338 Cane-sugar quickly heated to 160°, and kept in the melted state at that temperature for a moderate time, is converted into..lævulosan and dextro-glucose.

1887 Encycl. Brit. XXII. 624/1 It [sc. lævulose] fuses at 95° C.; at 170° it passes into lævulosan, C₆H₁₀O₅, analogous to glucosan.

b. Any polysaccharide composed chiefly of lævulose residues. Cf. levan n.

ΚΠ

1913 Chem. Abstr. 7 3511 (heading) Hydrolysis of levulosans and application to vegetable analysis.

1931 E. C. Miller Plant Physiol. viii. 412 The hexosans may be further classified according to the type of hexose that they yield on hydrolysis into the dextrosans (glucosans), the levulosans (fructosans), the mannans, and the galactans.

1966 T. Z. Nowakowski & A. J. Clarke tr. V. Kretovich Princ. Plant Biochem. (ed. 4) ix. 295 Higher plants also contain enzymes which catalyse the conversion of sucrose into a variety of polyglucosides and polyfructosides. In some plants (members of the Graminae and Liliaceae) levulosans..function as transport carbohydrates.

This entry has not yet been fully updated (first published 1976; most recently modified version published online June 2021).

单词	laevulosan
释义	laevulosanlevulosann. /ˈliːvjʊləsan/ Forms: Also laevulosane (see next). Etymology: < French lévulosane (A. Gélis 1860, in Compt. Rend. LI. 333), < lévulose laevulose n. Chemistry. a. An anhydride, C₆H₁₀O₅, of lævulose. ? Obsolete. ΚΠ 1862 H. Watts tr. L. Gmelin Hand-bk. Chem. XV. 338 Cane-sugar quickly heated to 160°, and kept in the melted state at that temperature for a moderate time, is converted into..lævulosan and dextro-glucose. 1887 Encycl. Brit. XXII. 624/1 It [sc. lævulose] fuses at 95° C.; at 170° it passes into lævulosan, C₆H₁₀O₅, analogous to glucosan. b. Any polysaccharide composed chiefly of lævulose residues. Cf. levan n. ΚΠ 1913 Chem. Abstr. 7 3511 (heading) Hydrolysis of levulosans and application to vegetable analysis. 1931 E. C. Miller Plant Physiol. viii. 412 The hexosans may be further classified according to the type of hexose that they yield on hydrolysis into the dextrosans (glucosans), the levulosans (fructosans), the mannans, and the galactans. 1966 T. Z. Nowakowski & A. J. Clarke tr. V. Kretovich Princ. Plant Biochem. (ed. 4) ix. 295 Higher plants also contain enzymes which catalyse the conversion of sucrose into a variety of polyglucosides and polyfructosides. In some plants (members of the Graminae and Liliaceae) levulosans..function as transport carbohydrates. This entry has not yet been fully updated (first published 1976; most recently modified version published online June 2021). < n.1862
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