Author's Organization：Pharmaceutical Institute, Medical Faculty, University of Kyushu Pharmaceutical Institute, Medical Faculty, University of Kyushu Pharmaceutical Institute, Medical Faculty, University of Kyushu Pharmaceutical Institute, Medical Faculty, University of Kyushu
3, 6-Dinitrophthalic acid gives a sensitive but unstable color reaction with reducing sugars when heated in sodium carbonate solution in the absence of sodium thiosulfate. This feature can be utilized in the approximate estimation of blood sugar and urine sugar with the naked eye. Basic zinc carbonate is successfully used in deproteinization of blood.
