An unknown carbohydrate solution tested (+) with Molisch’s reagent formed a red ppt. with Barfoed’s reagent within 3 minutes and turned blue-green when mixed with Bial’s orcinol reagent. What is this carbohydrate? Insert its Haworth projection structure.
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An unknown carbohydrate solution tested (+) with Molisch’s reagent formed a red ppt. with Barfoed’s reagent within 3 minutes and turned blue-green when mixed with Bial’s orcinol reagent. What is this carbohydrate? Insert its Haworth projection structure.
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- 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?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?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?
- An unknown carbohydrate solution tested (+) with Molisch’s reagent. It formed a red precipitate within 3 minutes with Barfoed’s reagent and turned blue-green when mixed with Bial’s orcinol reagent. What is the carbohydrate? Draw its Haworth structureWhat 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.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?
- Why do trioses and tetroses give negative result for the Molisch’s Test? Explain with the help of necessary chemical structures or minimal reaction blocks. Also mention Why do some organic acids like citric acids, lactic acid, etc. give positive result forMolisch’s Test?Name the complex formed by the addition of concentrated sulfuric acid to sugar solution and explain thereaction. 2. Why sucrose gives negative Benedict test? 3. Explain, although starch has free hemiacetal bond it gives negative Benedict test. 4. Why glucose (monosaccharide) and maltose (disaccharide) give positive Benedict test?5. What is the difference between Benedict and Barfoed's reaction?6. What are the carbohydrates’ that give positive result with Seliwanoff ? why?