Which Sugar Gives A Positive Benedict's Test But Is Negative With Iodine And Fermentation Tests?


4 Answers

Jennifer Bone Profile
Jennifer Bone answered
Starch turns to maltose when digested.  If you want to test for both starch and maltose you will need to add Benedict's reagent to get a positive result for both.  You may find the information on this website helpful for more information: http://flashcarddb.com/cardset/76799-starch-digestion-flashcards  Based on your question, you could assume that the positive tests following incubation indicate that the starch was somewhat converted to maltose allowing for a positive result for both.  However, if you have used Benedict's reagent, you would get a positive for both even if all of the starch had been digested.
Amanda Wells Profile
Amanda Wells answered
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Anonymous Profile
Anonymous answered
All reducing sugars gives +ve  result to benedict test while they give -ve result for the iodine and fermentation test this is because in iodine and fermentation test we are taking a polysaccharide carbohydrate which are non- reducing sugars while all the monosaccharides are  reducing sugars.
Anonymous Profile
Anonymous answered
Sugars with hemiacetal  group will give positive test while those with acetal such as glucose will give a negative test.

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