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Why glucose and fructose form same osazone?
Glucose, Fructose and Mannose give the same osazone because these sugars have the same configuration of carbons 3, 4, 5 and 6. osazone formation only affects carbons 1 and 2.
How did the reaction of mannose differs from that of the other sugar?
- most readily detected - estimated by means of mannose phenylhydrazone (which is insoluble in water) - yiels formation of crystals or precipitate fastest among sugars Manose is the only monosaccharide whose osazone (Phenylhydrazone) is insoluble in water. It is the first sugar that will change its color and form mannose crystals. This property is used to distinguish mannose from other sugars
What is the clinical significance of osazone test?
For identification purposes the carbonyl and adjacent alcohol functions will form phenylhydrazine derivatives known as osazones, which give characteristic melting points and exhibit definite crystalline structure. It should be noted that glucose , fructose and mannose yield the same osazone since the difference in structure and configuration about carbon atoms 1 and 2 are abolished.
Why osazone obtained from D-glucose and D-fructose have the same melting points?
glucose and fructose form same osazone crystals because carbon no 1 to carbon no 6 are identical both in glucose and in fructose
Why glucose and fructose form similar osazone crystals?
since carbons #3 through #6 of D-glucose and D-fructose molecules are identical, the sa,e osazone is formed.
Does ribose form osazone crystal?
yes. pure galactose forms petal shaped crystals
Osazone test for carbohydrates?
osazone test is a carbohydrate specific reaction in which carbs react with phenylhydrazine to form osazones i.e. crystals of specific shape. thus the test confirms the presence of a particular sugar.Eg:for sucrose one gets a mixture of glucosazone and fructosazone on the basis of components of sucrose.
Are D-glucose and D- mannose enantiomers?
No. Epimers are sugars that differ in the configuration around one carbon atom. D-Mannose and D-Galactose differ in two carbons (C-2 and C-4). yes. D-glucose and D-mannose are epimers (difference at C-2), D-glucose and D-galactose are epimers (difference at C-4), but D-mannose and D-galactose are not epimer(difference at C-2 and C-4).
How can temperature be increased without heating?
It is possible to add heat to a substance without changing its temperature. That happens during melting and boiling. However, I cannot think of a case in which the temperature of a substance increases without heat being added to it, either by radiation, conduction or convection.
How unequel heating effects tornadoes?
Unequal heating is usually needed for thunderstorms to form. Tornadoes form from thunderstorms.
3reasons why the osazone test can be used in the identification of sugars?
1.due to their characteristic crystalline appearance 2.due to their definite melting point 3.due to the length of time for the crystals to form
3 reasons why the osazone test can be used in identification of sugars?
a. It is due to their characteristic crystalline appearance b. It is due to their definite melting point c. It is due to the length of time for the crystals to form
