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After hydrolysis did sucrose give a positive test with fehlings test why orwhy not?
Sucrose would not give a positive test with Fehling's reagent after hydrolysis because sucrose is a non-reducing sugar. During hydrolysis, sucrose is broken down into its monosaccharide components (glucose and fructose), which are reducing sugars and can react with Fehling's reagent to give a positive test for reducing sugars.
Do eggs test positive in benedicts test?
Yes, eggs can test positive in the Benedict's test because they contain glucose, which is a reducing sugar that reacts with the reagent in the test to form a colored precipitate.
What is barfoed test?
The Barfoeds test will allow us to make a distinction between reducing monosaccharides and reducing disaccharides. If the Red tetrazolium test is done first and is positive for a reducing sugar, then the Barfoeds test will tell us if it is mono or di.
Why is the Benedict test not exclusive to glucose?
The Benedict test will return a positive value for any reducing sugar. It will work with fructose, for example. Benedict solution oxidizes all the reducing sugars such as glucose, galactose and fructose. This implies that a positive result of Benedict's test can be any of the reducing sugars, not necessarily glucose. It will oxidize the carbonyl (which present in all type of sugar classes). So if we get a positive result in the Benedict test, it is not necessarily glucose; it could be galactose or fructose that also a reducing sugar. So Benedict test can't be used to assure glucose.
Will Maltose produce a positive Benedict's test?
Yes, maltose will produce a positive Benedict's test because it is a reducing sugar. Benedict's reagent oxidizes the aldehyde or ketone group in reducing sugars, causing a color change from blue to orange/red in the presence of a reducing sugar like maltose.
Why doesn't aspartame react in Benedict's soluion?
It's not a reducing sugar. In fact, it's not a sugar at all. Benedict's solution gives a positive test, brick-red precipitate, with reducing sugars such as glucose and fructose.
Will hydrolysed dextrine give positive response to Benedict test?
Yes, it should. Benedicts test will be positive for reducing sugars, and since glucose is such a sugar, and would be a product of dextrin hydrolysis, you should get a positive result with Benedicts reagent.
Why does glycoproteins reacts positively with Molisch reagent?
Glycoproteins give positive results for Molisch's test. This answer is true because Molisch test was a test for sugar.
Why cant table sugar be the positive control in test using Benedict's solution?
Table sugar (sucrose) cannot be used as the positive control in a test using Benedict's solution because sucrose does not contain reducing sugars. Benedict's solution is used to test for the presence of reducing sugars, such as glucose and fructose, which can reduce the copper ions in the solution and cause a color change. Since sucrose does not have a free aldehyde or ketone group to reduce the copper ions, it will not produce a positive result in the Benedict's test. A positive control is typically a substance known to produce a positive result in the test, so using table sugar would not be appropriate in this case.
How is the coloured precipitate that is responsible for the positive test formed for reducing sugars?
The colored precipitate in the positive test for reducing sugars is formed due to the reaction between reducing sugars (such as glucose) and copper ions in Benedict's or Fehling's solution. The reducing sugar reduces the copper ions from their +2 state to +1, leading to the formation of a colored precipitate of copper(I) oxide.
What is a source of error for a reducing sugar Benedict's test?
A test known as a reducing sugar Benedictâ??s test was performed to determine the amount of sugars in various fruit. Some source of errors in this test included compromises involving the various age of the fruit, the size of the fruit, and the age of the fruit, and human error. However, the test did prove that fruit can damage the enamel of oneâ??s teeth.
what is fehling test?
It is a chemical reagent used to differentiate water-soluble carbohydrates and ketone functioning groups. Its also a test for reducing and non-reducing sugars.
