3. The Seliwanoff Test tests for ketoses by forming hydroxymethyl furfural (shown below) when heated with a strong mineral acid. This compound forms a red complex with resorcinol (1,3-dihydroxybenzene). The Seliwanoff reagent is a freshly prepared solution of 0.5% resorcinol in concentrated HCl. A visible red complex will form quickly with ketoses and more slowly with aldoses. Ja. Draw fructose and identify the three alcohol functional groups involved in the dehydra- tion reactions necessary to convert fructose into hydroxymethyl furfural. но b. Draw the mechanism for each (one of them includes an enol tautomeriza- tion reaction!).
Catalysis and Enzymatic Reactions
Catalysis is the kind of chemical reaction in which the rate (speed) of a reaction is enhanced by the catalyst which is not consumed during the process of reaction and afterward it is removed when the catalyst is not used to make up the impurity in the product. The enzymatic reaction is the reaction that is catalyzed via enzymes.
Lock And Key Model
The lock-and-key model is used to describe the catalytic enzyme activity, based on the interaction between enzyme and substrate. This model considers the lock as an enzyme and the key as a substrate to explain this model. The concept of how a unique distinct key only can have the access to open a particular lock resembles how the specific substrate can only fit into the particular active site of the enzyme. This is significant in understanding the intermolecular interaction between proteins and plays a vital role in drug interaction.
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