Fehlingn.
/ˈfeɪlɪŋ/ Used attributively or in the possessive to designate an alkaline solution of cupric sulphate and Rochelle salt used in sugar analysis; also elliptical. Hence Fehling('s) reaction, Fehling('s) test.
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Fehling1873
1873 Jrnl. Chem. Soc. 11 265 The crystals, which are permanent in the air, neither hygroscopic nor efflorescent, are recommended by the author for the titration of Fehling's solution.
1887 Encycl. Brit. XXII. 624/1 Every c.c. of Fehling solution oxidises about 5 milli-grams..of dextrose.
1909 Cent. Dict. Suppl. 464/3 Fehling's reagent, test.
1946 Nature 31 Aug. 295/2 The distillate slightly reduced Fehling's solution.
1954 Thorpe's Dict. Appl. Chem. (ed. 4) XI. 203/2 Soxhlet's Fehling solution in excess is boiled with sugar solution.
1954 Thorpe's Dict. Appl. Chem. (ed. 4) XI. 205/2 Into a flask of 300–400 ml. capacity, measure 10 ml. or 25 ml. of Fehling.
1960 A. E. Bender Dict. Nutrition & Food Technol. 48/2 Fehling's test, for reducing substances, mostly used to distinguish reducing from non-reducing sugars.
This entry has not yet been fully updated (first published 1972; most recently modified version published online March 2019).
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