Methods of Organic Analysis
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At this temperature, however, dextrose reduces very slowly so that the heating must be continued for several hours.
Recent experiments have shown that the test as described is capable of distinguishing between dextrose and maltose in aqueous solutions containing less than 0. 02 per cent, of the former and at least 0. 2 per cent, of the latter, provided the results are controlled by check experiments made under identical conditions with solu- tions containing known amounts of dextrose and maltos...e. Dextrin does not interfere. (Unpublished results by L. J. Cohen. ) If the solution tested contains proteids these are precipitated by the copper, rendering the test slightly less delicate.
In applying the reaction to an unknown solution, comparative tests should be made as directed in the case of the phenylhydrazine test.
REACTIONS WITH ACIDS.
All carbohydrates on treatment with moderately strong hydro- chloric or sulphuric acid yield furfurol, which is probably the cause of the color reaction with a-naphthol described below.
What to read after Methods of Organic Analysis?
You can find similar books in the "Read Also" column, or choose other free books by Henry Clapp Sherman to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
At this temperature, however, dextrose reduces very slowly so that the heating must be continued for several hours.
Recent experiments have shown that the test as described is capable of distinguishing between dextrose and maltose in aqueous solutions containing less than 0. 02 per cent, of the former and at least 0. 2 per cent, of the latter, provided the results are controlled by check experiments made under identical conditions with solu- tions containing known amounts of dextrose and maltos...e. Dextrin does not interfere. (Unpublished results by L. J. Cohen. ) If the solution tested contains proteids these are precipitated by the copper, rendering the test slightly less delicate.
In applying the reaction to an unknown solution, comparative tests should be made as directed in the case of the phenylhydrazine test.
REACTIONS WITH ACIDS.
All carbohydrates on treatment with moderately strong hydro- chloric or sulphuric acid yield furfurol, which is probably the cause of the color reaction with a-naphthol described below.
What to read after Methods of Organic Analysis?
You can find similar books in the "Read Also" column, or choose other free books by Henry Clapp Sherman to read onlineMoreLess
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