Study Set Content:
This cuprous oxide gives a (blank) in the solution.
brick red colored precipitate
Osazone or phenylhydrazine test The reagent for this test consists of
phenylhydrazine in acetate buffer and glacial acetic acid
Osazone appears as
yellow-colored crystals
A typical reaction showing the formation of an osazone. D-glucose reacts with phenylhydrazine to giv
glucosazone.
Carbohydrate time of formation in mins.
Fructose
2
Glucose
5
Galactose
20
Maltose
30-45
Lactose
30-45
Carbohydrate Crystallin structure
Needle shape
Fructose
Needle shape
Glucose
Cotton ball/powder puff shape
Lactose
Sunflower/star shape
Maltose
Thorny ball shape
Galactose
Needle shaped crystals (Fructose)
Balls with thorny edge shaped crystals (Galactose)
is a chemical test used to differentiate reducing sugars from nonreducing sugars.
Tollens’ test
Tollens’ test is a chemical test used to differentiate reducing sugars from nonreducing sugars. This test is also called the (blank)based on the end product of this test.
silver mirror test
Tollens' reagent is an alkaline solution of ammoniacal silver nitrate and is used to test for
aldehydes.
is also used for the analysis of a reducing monosaccharide
Barfoed’s Test
