CBSE Class 12 Biology Experiment No

Topics: Enzyme, Saliva, Starch Pages: 2 (492 words) Published: January 24, 2015
CSBE – Class 12 – Biology – Experiment 12

Experiment No. 12
Aim- To study the effects of temperature on the enzymatic activity of salivary amylase on substrates starch.
Materials required- Test tubes, beakers, pipettes, funnels, thermometer, cotton, starch, iodine, potassium iodide, sodium chloride, thermocol box, buffer solution of pH 6.8 & match box. Principle- Salivary amylase is an amylolytic enzyme found in saliva released from salivary glands. All the enzymes show optimum enzymatic activity around 37° C which is our body temperature. Any deviation from optimum temperature can influence configuration of enzymes which involves folding of polypeptide for acquiring & maintaining its catalytic & allosteric sites. Decline in temperature modifies the catalytic site & the enzymatic activity is significantly lowered & enzyme is deactivated. However, deactivated enzyme can resume its optimum activity whenever optimum temperature of 37° C is provided again. Increase in temperature on the other hand hampers the catalytic site & enzymatic activity is lost forever & enzyme is denatured.

Procedure: In each experimental tubes, add 1ml of diluted enzyme. Immediately with the help of a dropper, take a drop each from these tubes & add to the tubes having iodine. Note the time reading as 0 minute reading. After an interval of 2 to 4 min, again take a drop from each tube & add to the iodine tubes & note the change in the color of iodine. Keep on repeating it after an interval of every 2 to 4 min till the color of iodine does not change any further.

Observation table:


Page 1

CSBE – Class 12 – Biology – Experiment 12


Time taken to reach the achromic point

Result: It takes less time to reach achromic point at 37° C as the enzyme is ,maximum active at this temperature while at higher & lower temperatures more time is taken to reach the achromic point.

Explanation: All enzymes are chemically protein in nature. At higher...
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