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The more correct way is to ascertain the reducing power on Fehling's solution, before and after digestion with an excess of starch, and I intend to say a few words upon this subject on a future occasion, when I have ascertained the maximum amount of diastase existing in the best samples of malt. The Analyst. By Dr.
In this way all air-bubbles are avoided. Label three test tubes A, B, and C. In A, place starch paste; in B, saliva; and in C one volume of saliva and three volumes of starch paste. Place them for ten minutes in a water bath at about 104 degrees Fahrenheit. Test portions of all three for a reducing sugar, by means of Fehling's solution or tablets.
For the determination of starch in barley the finely-ground sample is boiled for three-quarters of an hour with about thirty times its weight of a one per cent solution of salicylic acid, the resulting colorless opalescent liquid filtered with the aid of suction, and the starch therein inverted by means of hydrochloric acid. The dextrose formed is estimated by Fehling's solution.
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