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Benedictís reagent

 Alkaline copper reagent (sodium citrate, sodium carbonate and copper sulphate) used for detection and semi-quantitative determination of glucose and other reducing sugars. Benedictís quantitative reagent also includes potassium thiocyanate and potassium ferrocyanide. The colour of the precipitate on boiling gives an indication of the concentration of glucose between 0.05 and 2%.