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Posted by on Saturday, November 29, 2008 at 2:34pm.

Is anyone familar with the equilibrium reactions that convert the ketone group of fructose into an aldehyde group so fructose give a positive Fehling's Test? I know it will as we received so in class but not sure how the reaction takes place.

  • Biochemistry - , Saturday, November 29, 2008 at 3:34pm

    It's explained at this site. Scroll down to the first paragraph under Figure 2 (about 60% down the page). Fructose is converted to glucose and mannonse under th alkaline conditions of the Fehling's test solution.

  • Biochemistry - , Saturday, November 29, 2008 at 3:35pm

    I didn't post the site. Here it is.
    http://www.chemie.uni-regensburg.de/Organische_Chemie/Didaktik/Keusch/D-Fehling-e.htm

  • Biochemistry - , Sunday, November 30, 2008 at 5:33pm

    DrBob,

    Does Figure 2 demonstrate that Fructose is giving a positive result (as an aldose)even though it has been converted to glucose and manose? Thanks for the clarification.

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