CARBOHYDRATESSHEANNEN NICOLE L. TAN11DEPARTMENT OF CHEMICAL
ENGINEERING, COLLEGE OF UNIVERSITY OF THE PHILIPPINES, DILIMAN,
QUEZON CITY 1101, PHILIPPINES DATE SUBMITTED: MARCH 25, 2015DATE
PERFORMED: MARCH 27, 2015
ANSWERS TO QUESTIONS
Discuss:
1. Draw the structure of the osazones produced in the
experiment.Glucosazone
Maltose first hydrolyzes before forming glucosazone +
glucosazone+
Fructosazone
Sucrose first hydrolyzes before forming glucosazone +
fructosazone+
Note: glucosazone and fructosazone are the same compound
2. Theoretically, arrange the following sugars according to
their reactivity with the Benendicts reagent.Sucrose< starch<
fructose = glucose < maltose
3. What is the difference between the Benedicts Test and
Barfoeds Test?Benedicts test is used to detect reducing sugars,
Copper (II) ions in Benedicts reagent are reduced and a brick red
copper (I) oxide precipitate is formed. Barfoeds test is used to
detect monosaccharides. This test involves the same reactions as in
Benedicts test; however, disaccharides react much slower.
4. Can the Seliwanoffs test be used to differentiate sucrose
from fructose? Why?Answer
5. Draw the hydrolysis products of sucrose and starch.Answer
6. Give a molecular explanation for the role of starch as an
antidote for iodine poisoning.Answer
(1 space, Cambria 10)
REFERENCES (CAMBRIA 11, ALL CAPS, BOLD)(1 space, Cambria 10)[1]
Caleja, H., 2010. How to Write a Formal Report. Quezon City: UP
Diliman. 21-30.
You may use other formats (MLA or APA citation). Minimum of 3
print references and maximum of 2 online sources.(1 space, Cambria
10)
