A certain amount of white solid was dissolved in enough water and gives a colorless solution. A portion of the solution was added with 15% solution of alpha-naphthol solution and a few drops of conc. H2SO4 forming a violet-colored ring. Another portion was added with drops of Seliwanoff’s reagent and showed no change after being warmed in a bath. Another portion was added with equal amounts of Fehling’s A and B reagent giving a red precipitate in a blue solution after warming in a bath. a) Cite an experimental result confirming that the solid is a carbohydrate b) Is the solid starch, fructose or glucose? Support your answer.
A certain amount of white solid was dissolved in enough water and gives a colorless solution. A portion of the solution was added with 15% solution of alpha-naphthol solution and a few drops of conc. H2SO4 forming a violet-colored ring. Another portion was added with drops of Seliwanoff’s reagent and showed no change after being warmed in a bath. Another portion was added with equal amounts of Fehling’s A and B reagent giving a red precipitate in a blue solution after warming in a bath. a) Cite an experimental result confirming that the solid is a carbohydrate b) Is the solid starch, fructose or glucose? Support your answer.
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
Problem 1P
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A certain amount of white solid was dissolved in enough water and gives a colorless solution. A portion of the solution was added with 15% solution of alpha-naphthol solution and a few drops of conc. H2SO4 forming a violet-colored ring. Another portion was added with drops of Seliwanoff’s reagent and showed no change after being warmed in a bath. Another portion was added with equal amounts of Fehling’s A and B reagent giving a red precipitate in a blue solution after warming in a bath.
a) Cite an experimental result confirming that the solid is a carbohydrate
b) Is the solid starch, fructose or glucose? Support your answer.
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