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单词 tropaeolin o
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tropaeolin O
Any of a group of orange and yellow sulphonated azo dyes, some of which are used as pH indicators. Frequently with capital letter, numeral, etc., as a postmodifier, denoting a particular dye of this group, as tropaeolin O.
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the world > matter > colour > named colours > orange > colouring matter > [noun] > dyes
alcanna1526
henna1600
Egyptian privet1825
aurantia1877
tropaeolin1878
tartrazine1894
1878 Chem. News 31 May 228/1 W. v. Miller proposes the colour tropeolin, discovered by O. Witt,..as an indicator for the presence of an acid in volumetric analysis.
1878 Chem. News 9 Aug. 71/1 (title) Tropæolin as an alkalimetric indicator.
1880 Jrnl. Soc. Arts 446 This body has been used as a dye, under the name of Tropæoline O.
1907 Calif. State Jrnl. Med. 5 135/2 None or a trace only was found with tropeolin as the indicator.
1922 J. J. Sudborough Bernthsen's Text-bk. Org. Chem. (new ed.) xxii. 426 Resorcin yellow.., obtained by coupling a diazotized solution of sulphanilic acid with an alkaline solution of resorcinol, is known as Tropæolin O.
1955 Science 4 Feb. 169/2 This technique was checked by the application of tropaeolin 000 to a transfer wick.
2001 C. A. Reddy & Z. Mathew in G. M. Gadd Fungi Bioremediation iii. 64 P. chrysosporium has been reported to decolorize azo dyes Congo Red, Orange II and Tropaeolin.
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