juglonen.
/ˈdʒuːɡləʊn//ˈdʒʌɡləʊn/ Chemistry.
5-Hydroxy-1,4-naphthoquinone, C10H6O3, a reddish-yellow crystalline compound obtained from the green shells of walnuts and having fungicidal properties.
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the world > matter > chemistry > organic chemistry > crystalline substances > [noun] > others
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the world > health and disease > healing > medicines or physic > medicines for specific purpose > remedies for parasitic infections > [noun] > fungicide > plant-derived
thrush-lichen1759
juglone1878
1878 Jrnl. Chem. Soc. 34 233 Juglone (Nucin)... This body, prepared from the green shells of walnuts (Juglans regia), has been analysed by the author, who assigns to it the empirical formula, C36H12O10.
1887 Athenæum 11 June 770/1 The outer coating of walnuts contains a crystalline substance termed nucin or juglone.
1887 Chem. News 9 Nov. 214/1 ‘Juglon’. An extended series of analytical results with regard to this body.
1892 H. E. Roscoe & C. Schorlemmer Treat. Chem. III. vi. 138 About 150 grms. of juglone are thus obtained from rather more than 100 kilos. of walnut-shells.
1906 Watts' Dict. Chem. III. 594/2 Di-nitro-oxy-phthalic acid... Juglonic acid. Formed by oxidation of juglone or its acetyl derivative by boiling with HNO3.
1925 Phytopathology 15 783 Juglone..is an irritant causing violent sneezing and has been found..to be especially valuable as a medicant for skin diseases.
1949 E. P. Abraham in H. W. Florey et al. Antibiotics I. xiv. 619 Brissemoret and Michaud (1917) reported the use of juglone in clinical cases of eczema, impetigo, and other skin diseases.
1971 R. H. Thomson Naturally occurring Quinones (ed. 2) iv. 222 Finely powdered juglone is an effective sternutator and like many other quinones has weak fungicidal and bactericidal properties.
Derivatives
juglonic adj. in juglonic acid, an acid formed by the action of nitric acid on juglone.
ΚΠ
1906 Watts' Dict. Chem. III. 594/2 Di-nitro-oxy-phthalic acid... Juglonic acid. Formed by oxidation of juglone or its acetyl derivative by boiling with HNO3.
This entry has not yet been fully updated (first published 1933; most recently modified version published online December 2020).
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n.1878