Study Set Content:
The reducing sugar will reduce into the enediols by the reaction with Benedict’s solution. The reducing sugar gives
green to brick red color precipitate
The reducing sugar will reduce into the enediols by the reaction with Benedict’s solution. The reducing sugar gives green to brick red color precipitate depending upon the sugar
concentration
The color change is due to the reduction reaction of
copper (II) to copper (I)
The color change is due to the reduction reaction of copper (II) to copper (I) in the solution to form a
red colored precipitate
The aldehyde formed is either
furfural or hydroxymethylfurfural
roduced by the dehydration of pentoses or pentosans
furfural
produced by the dehydration of hexoses or hexosans
hydroxymethylfurfural
Then the α-naphthol in the Molisch’s reagent reacts with the aldehyde and form
purplecondensation product.
The color change is due to the reduction reaction of copper (II) to copper (I) in the solution to form a red colored precipitate, which is
water-insoluble
The sodium carbonate provides the alkaline condition or maintains the
alkalinity in the solution
The color change is due to the reduction reaction of copper (II) to copper (I) in the solution to form a red colored precipitate, which is water-insoluble. The sodium carbonate provides the alkaline condition or maintains the alkalinity in the solution for the
redox reaction to occur
The color change is due to the reduction reaction of copper (II) to copper (I) in the solution to form a red colored precipitate, which is water-insoluble. The sodium carbonate provides the alkaline condition or maintains the alkalinity in the solution for the redox reaction to occur. Sodium citrate binds with the
copper (II) ions
The color change is due to the reduction reaction of copper (II) to copper (I) in the solution to form a red colored precipitate, which is water-insoluble. The sodium carbonate provides the alkaline condition or maintains the alkalinity in the solution for the redox reaction to occur. Sodium citrate binds with the copper (II) ions to prevent the reduction into
copper (I) during storage
is also used for the analysis of reducing sugar
Fehling’s Test
is a chemical test used to detect reducing sugars.
Osazone or phenylhydrazine test
This test even allows the differentiation of different reducing sugars on the basis of the time of appearance of the complex.
Osazone or phenylhydrazine tes
contains copper sulfate pentahydrate in 1L of distilled water
Fehling’s solution A
contains potassium sodium tartrate and sodium hydroxide with 1L of distilled water
Fehling’s solution B
In the Fehling’s test, a reduction reaction occurs in between the
aldehyde or keto groups of the reducing sugar and the alkaline cupric hydroxide
n the Fehling’s test, a reduction reaction occurs in between the aldehyde or keto groups of the reducing sugar and the alkaline cupric hydroxide which on heating is reduced into
cuprous oxide
