What happens when saliva is added to the starch containing food? How does it react for the starch test?
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On addition of saliva which contains an amylase, a starch digesting enzyme (chemical compound that catalyses the breakdown of starch); the starch gradually converts to sugar. Once the starch is broken down, the blue colour disappears. It is important to know that the salivary amylase requires an alkaline medium to act
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If we add saliva on strach , the salivary amylase present in saliva gradually acts on strach and converts it into maltose. strach keeps on giving blue colour with iodine till it completely digest into maltose . At this point no blue colour is formed.
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