Sucrose diazouracil test

Identification, Hexaacetate diazouracil test (positive for sucrose or sucrose-containing oligosaccharides, i.e., raffinose, gentianose, and stachy-ose) (87), A sensitive specific method is based on the serological identification of a dextran produced by a sucrose-specific dextransucrase (88),... 

A particularly important color reaction is the Raybin diazouracil test for sucrose (see under Sucrose). An alkaline solution of diazouracil turns green in the presence of sucrose. The only known interfering substances are raffinose, gentianose, and stachyose. 

Purves and Hudson76 regarded the positive, Raybin77 diazouracil reaction given by raffinose as being a more specific test for the presence of a sucrose linkage than is fermentability by yeast or action by yeast invertase. 

In the diazouracil test77 neither planteose nor melezitose gives a characteristic test for a sucrose arrangement. 

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