In the acid- catalyzed hydrolysis of starch, how can you tell when the hydrolysis of starch is complete, why does the test work this way? What is the monosaccharide at the end?
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In the acid- catalyzed hydrolysis of starch, how can you tell when the hydrolysis of starch is complete, why does the test work this way? What is the monosaccharide at the end?
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- Is Raffinose tri-saccharide a reducing sugar? Explain the chemistry of the reducing sugar test and apply it to the tri-saccharide attached.Instead of Molisch's test, what specific test can be used to detect the presence of pentose sugar?What test reagent is most sensitive in detecting sugar in urine? What are the possible positive results (color) and its interpretation? What test could be used to differentiate: sucrose and lactose? Explain. glucose and starch? Explain. glucose and fructose? Explain. galactose and fructose? Explain An unknown carbohydrate gave a brick red precipitate when tested with Fehling's reagent, turned red when reacted with Seliwanoff's reagent, and quickly gave a red precipitate when reacted with Barfoed's reagent. What conclusions can be made about this carbohydrate? Illustrate with equation the reaction of glucose, galactose, maltose & lactose with osazone test. Sketch the crystals formed for each of the following sugars examined under the microscope.
- An unknown carbohydrate gave a brick-red precipitate when tested with Fehling’s reagents, turned red when reacted with Seliwanoff’s reagent, and quickly gave a red precipitate with Barfoed’s reagent. What conclusion can be made about this carbohydrate?What are the hydrolytic products of sucrose? ________________________________________________________________________________________________________________________________________ Compare the reducing properties between unhydrolyzed and hydrolyzed sucrose. ________________________________________________________________________________________________________________________________________ Why is hydrolysis of sucrose also known as specific sucrose test? ________________________________________________________________________________________________________________________________________ Does the product of starch hydrolysis still contain polysaccharides? What test could have done to confirm this? ________________________________________________________________________________________________________________________________________ What enzyme in the human body can hydrolyze starch?…Instead of Molisch's test, what specific test can be used to detect the presence of pentose sugar? Write the procedure
- Inulin is a polysaccharide compound entirely of fructose units. What would be the effect of the seliwanoff's test on inulin? Explain in 2-3 sentences.What inferences can be made from the Benedict’s test of the hydrolysates of the following? Was the acid treatment able to hydrolyze the sugars? a. sucroseb. starchc. celluloseWhat color difference will be observed in glycogen with iodine test or how can iodine test be used to distinguish between amylose and glycogen?
- An unknown carbohydrate turned red when reacted with Seliwanoff’s reagent and quickly gave a red precipitate when reacted with Barfoed’s reagent. What conclusions can be made about this carbohydrate?Polysaccharides generally do not give a positive test with Fehling’s solution. Why? *Both Glucose and galactose are known to be epimers. To differentiate these two sugars, what test should be used? Explain the answer.