metapecticn.

Brit.

/ˌmɛtəˈpɛktɪk/, U.S.

/ˌmɛdəˈpɛktɪk/

Origin: Formed within English, by derivation; modelled on a French lexical item. Etymons: meta- prefix, pectic adj.

Etymology: < meta- prefix + pectic adj., after French métapectique (1848 in the phrase acide métapectique (E. Frémy 1848, in Ann. de chim. et de physique 24 36).

Chemistry. Now rare. Perhaps Obsolete.

metapectic acid n. an uncrystallizable acid formed from pectic acid after boiling and treating with alkali; (perhaps) = arabic acid n. at arabic adj.²

ΘΚΠ

the world > matter > chemistry > organic chemistry > acids obtained from plants or trees > [noun] > miscellaneous others

rheumic acid1816

arabic acida1836

rubiacic acid1835

aspartic acid1836

sylvic acid1836

tannic acid1836

oenanthic acid1837

gummic acid1838

retinic acid1838

roccellic acid1838

rubinic acid1838

lobelic acid1840

polychromatic acid1840

rhabarbaric acid1840

roccelline1840

humic1844

sumbulolic acid1844

isatic acid1845

opianic acid1845

parthenic acid1845

polychromic acid1847

styphnic acid1848

metapectic acid1849

tanningenic acid1852

jalapic acid1853

jalapinolic acid1855

sinapic acid1857

amalic acid1863

phycic acid1864

filicic acid1865

isamic acid1865

tannocaffeic acidc1865

tricarballylic acid1865

guaiaretic acid1866

pectous acid1866

phytomelin1866

porphyric acid1866

thujetic acid1868

turpetholic acid1868

viridic acid1868

rheotannic acid1869

arabinic acid1870

frangulic1872

sclerotic acid1876

theobromic acid1878

gynocardic acid1897

chaulmoogric acid1904

1849 Q. Jrnl. Chem. Soc. 1 411 An excess of alkali must also be avoided in preparing the acid, or it becomes converted into metapectic acid.

1857 W. A. Miller Elements Chem. III. 84 Parapectic acid in its turn, when treated with alkalies, passes into another uncrystallizable acid, the metapectic.

1867 Philos. Trans. (Royal Soc.) 157 182 (note) The reactions of pectic and of para- and meta-pectic acids have been so frequently obtained that these substances must be regarded as general products of the gradual decomposition of gun-cotton.

1877 H. Watts Dict. Chem. (new ed.) IV. 369 Aqueous metapectic acid precipitates basic acetate of lead, but not the neutral acetate.

1890 J. S. Billings National Med. Dict. II. 145/2 Metapectic acid, an acid similar to, or identical with, cerasin; prepared from the sugar-beet.

1923 Proc. Royal Soc. B. 95 117 Products of hydrolysis, more acid in nature, such as metapectic acid, probably identical with arabic acid, going into true solution in water.

This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2022).

单词	metapectic
释义	metapecticn. Brit. /ˌmɛtəˈpɛktɪk/, U.S. /ˌmɛdəˈpɛktɪk/ Origin: Formed within English, by derivation; modelled on a French lexical item. Etymons: meta- prefix, pectic adj. Etymology: < meta- prefix + pectic adj., after French métapectique (1848 in the phrase acide métapectique (E. Frémy 1848, in Ann. de chim. et de physique 24 36). Chemistry. Now rare. Perhaps Obsolete. metapectic acid n. an uncrystallizable acid formed from pectic acid after boiling and treating with alkali; (perhaps) = arabic acid n. at arabic adj.² ΘΚΠ the world > matter > chemistry > organic chemistry > acids obtained from plants or trees > [noun] > miscellaneous others rheumic acid1816 arabic acida1836 rubiacic acid1835 aspartic acid1836 sylvic acid1836 tannic acid1836 oenanthic acid1837 gummic acid1838 retinic acid1838 roccellic acid1838 rubinic acid1838 lobelic acid1840 polychromatic acid1840 rhabarbaric acid1840 roccelline1840 humic1844 sumbulolic acid1844 isatic acid1845 opianic acid1845 parthenic acid1845 polychromic acid1847 styphnic acid1848 metapectic acid1849 tanningenic acid1852 jalapic acid1853 jalapinolic acid1855 sinapic acid1857 amalic acid1863 phycic acid1864 filicic acid1865 isamic acid1865 tannocaffeic acidc1865 tricarballylic acid1865 guaiaretic acid1866 pectous acid1866 phytomelin1866 porphyric acid1866 thujetic acid1868 turpetholic acid1868 viridic acid1868 rheotannic acid1869 arabinic acid1870 frangulic1872 sclerotic acid1876 theobromic acid1878 gynocardic acid1897 chaulmoogric acid1904 1849 Q. Jrnl. Chem. Soc. 1 411 An excess of alkali must also be avoided in preparing the acid, or it becomes converted into metapectic acid. 1857 W. A. Miller Elements Chem. III. 84 Parapectic acid in its turn, when treated with alkalies, passes into another uncrystallizable acid, the metapectic. 1867 Philos. Trans. (Royal Soc.) 157 182 (note) The reactions of pectic and of para- and meta-pectic acids have been so frequently obtained that these substances must be regarded as general products of the gradual decomposition of gun-cotton. 1877 H. Watts Dict. Chem. (new ed.) IV. 369 Aqueous metapectic acid precipitates basic acetate of lead, but not the neutral acetate. 1890 J. S. Billings National Med. Dict. II. 145/2 Metapectic acid, an acid similar to, or identical with, cerasin; prepared from the sugar-beet. 1923 Proc. Royal Soc. B. 95 117 Products of hydrolysis, more acid in nature, such as metapectic acid, probably identical with arabic acid, going into true solution in water. This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2022). < n.1849
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