polyphenoln.
/ˌpɒlɪˈfiːnɒl/, U.S. /ˌpɑliˈfiˌnɔl/, /ˌpɑliˈfiˌnɑl/ Chemistry.
A compound which contains more than one phenolic hydroxyl group.
ΘΚΠ
the world > matter > chemistry > organic chemistry > hydrocarbons > [noun] > benzene derivatives > phenols > polyphenols
polyphenol1894
1894 Jrnl. Chem. Soc. 66 i. 415 It is noteworthy that all polyphenols derived from pyrogallol yield blue compounds.
1947 Sci. News 5 90 Many substances to be found in soil will reduce manganese dioxide, for example, polyphenols and sulphydryl compounds.
1973 Sci. Amer. Dec. 62/1 The abundance in the leaves of plants of distasteful and toxic compounds such as alkaloids and polyphenols.
1995 Guardian 22 Dec. i. 9/6 The doctors say a chemical called polyphenol, released during fermentation, appears to kill the bacteria.
Compounds
polyphenol oxidase n. Biochemistry any of the phenolase ezymes which oxidize polyphenols; (more widely) any phenolase.
ΚΠ
1913 Chem. Abstr. 12 796 They [sc. Battelli and Stern]..defend the use of the term polyphenoloxidase used to designate the enzyme which oxidizes chiefly the polyphenols and polyamines.
1973 F. B. Abeles Ethylene in Plant Biol. viii. 205 Polyphenol oxidase is a copper-containing enzyme which catalyzes the oxidation of phenols such as tyrosine.
1996 Daily Tel. 8 Jan. 18/6 Now the team wants to switch off the gene responsible for polyphenoloxidase, an enzyme that causes the sultana to go brown.
This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022).
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n.1894