If we take food rich in lime juice, then
(1) Action of ptyalin on starch is enhanced.
(2) Action of ptyalin on starch is reduced.
(3) Action of ptyalin on starch is unaffected.
(4) Action of ptyalin on starch stops.

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Please find below the solution to the asked query    

Option (2) is correct.
The pH of mouth is slightly acidic to neutral (6.5-7.0). Ptyalin acts best in this range of pH. Lime juice contains mild acid and so, decrease the pH of mouth, thereby reducing the action of ptyalin on starch in the mouth. 

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Answer: A- action of ptylin is enhanced. 0 Home » Forum » Zoology » if we take food rich in lime juice,then... if we take food rich in lime juice,then action of ptyalin on starch is enhanced action of ptyalin on starch is reduced action of ptyalin on starch is unaffected action of ptyalin on starch stops 3 years ago Answers : (1) Normal pH in healthy mouth is about 6.5-7, so slightly acidic to neutral. Lime juice contains a mild organic acid (citric acid), so consuming food with lime juice will cause a lowering of pH in your mouth. As a consequence, the activity of ptyalin (salivary α-amylase, an enzyme which breaks starch down into maltose and dextrin, making digestion to glucose easier - and your body really needs glucose as a source of energy!) will be inhibited if pH drops below the optimum range of 5.6-6.9. In extremis, if enough acidic food is consumed together with food containing starch, probably the effect would be a slower digestion of starch since ptyalin is not much helping anymore (by starting breaking the starch from the mouth).
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