galactann.

Brit.

/ɡəˈlaktan/, U.S.

/ɡəˈlæktæn/

Origin: A borrowing from German. Etymon: German Galactan.

Etymology: < German Galactan (C. Scheibler 1882, in Neue Zeitschr. f. Rübenzucker-Industrie 8 277/1; now also Galaktan ), alteration of Galactin galactin n. after Dextran dextran n.

Chemistry.

Any of a class of polysaccharides which are composed of a chain of galactose residues, and which yield galactose on hydrolysis.Galactans occur commonly in plant and microbial cell walls.

ΚΠ

1886 Jrnl. Chem. Soc. 50 609 This carbohydrate [from the seed of Lupinus luteus] very closely resembles galactin (or adopting Scheibler's nomenclature galactan), obtained by Muntz from the seed of the lucerne.

1897 Bot. Rev. 24 301 Upon the penetration of the enzyme there follows a fractional hydrolytic solution by which galactan is removed from the cell wall.

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.

1963 M. Florkin & E. H. Stotz Comprehensive Biochem. V. vii. 222 Galactans of animal origin are rare. The snail Helix pomatia and a few other cold-blooded animals produce a highly branched levorotatory galactan containing d-galactose and a lesser amount of l-galactose.

2006 Sci. News 170 152/2 Inhibitors of the enzymes that assemble galactans for the middle layer of the cell wall when the microbe replicates.

This entry has been updated (OED Third Edition, November 2010; most recently modified version published online March 2022).

单词	galactan
释义	galactann. Brit. /ɡəˈlaktan/, U.S. /ɡəˈlæktæn/ Origin: A borrowing from German. Etymon: German Galactan. Etymology: < German Galactan (C. Scheibler 1882, in Neue Zeitschr. f. Rübenzucker-Industrie 8 277/1; now also Galaktan ), alteration of Galactin galactin n. after Dextran dextran n. Chemistry. Any of a class of polysaccharides which are composed of a chain of galactose residues, and which yield galactose on hydrolysis.Galactans occur commonly in plant and microbial cell walls. ΚΠ 1886 Jrnl. Chem. Soc. 50 609 This carbohydrate [from the seed of Lupinus luteus] very closely resembles galactin (or adopting Scheibler's nomenclature galactan), obtained by Muntz from the seed of the lucerne. 1897 Bot. Rev. 24 301 Upon the penetration of the enzyme there follows a fractional hydrolytic solution by which galactan is removed from the cell wall. 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. 1963 M. Florkin & E. H. Stotz Comprehensive Biochem. V. vii. 222 Galactans of animal origin are rare. The snail Helix pomatia and a few other cold-blooded animals produce a highly branched levorotatory galactan containing d-galactose and a lesser amount of l-galactose. 2006 Sci. News 170 152/2 Inhibitors of the enzymes that assemble galactans for the middle layer of the cell wall when the microbe replicates. This entry has been updated (OED Third Edition, November 2010; most recently modified version published online March 2022). < n.1886
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