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Minor Versionm

by Procheta Mallik

Introduction

Using simple classic tests for starch, glucose and fake milk, we perform tests on milk to check for adulteration.

    • Exercise caution when boiling water

    • Wash your hands thoroughly after handling iodine solution and Benedict's re-agent

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  1. Take some milk in Test tube.
    • Take some milk in Test tube.

    • Add few drops of iodine solution and shake it well.

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    • The yellowish hue of the milk confirms that the milk is not adulterated with starch.

    • If the milk sample is adulterated with starch, the color will change to blue.

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    • Take enough milk in test tube so that you can dip a pH Strip

    • Dip a pH strip into the milk

    • If the milk is pure and not adulterated, the color will be among the shades of lighter green or orange with PH value of 6-7

    • If the milk is 'synthetic' and adulterated, the color will be among the shades of dark green with PH value of 10-11

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    • Take small amount of milk on test tube

    • Add equal amount of Benedict's reagent using dropper and shake it well.

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    • Prepare a boiling Water bath by heating water in a small vessel on a Induction/Gas Stove

    • Using test tube holder, lower the test tube into the boiling water bath.

    • Keep the test tube in boiling water bath for 3-5 minutes and observe the color changes.

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    • If the color is still blue, The milk is pure and not adulterated with glucose.

    • If the color turns to green, it means trace amount of glucose is present.

    • If the color turns to yellow, small amount of glucose is present

    • If the color turns to orange, moderate amount of glucose is present

    • If the color turns to bright red, high concentration of glucose is present.

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    • Not enough Iodine solution added.

    • Not enough Benedict's re-agent added.

    • Pulling the test tube out of boiling water bath in much less time than suggested or before the color change occurs.

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    • Can you figure out why 'adulterants' such as Starch and glucose are added to the milk?

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Finish Line

Kailash NR

Member since: 05/02/2017

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