To detect the presence of starch added as an adulterant to the milk Download in Pdf

 

Practical Notebook Biology Standard XII

Biology 

Answeres

Practical Notebook
Standard XII

Class-12th

science

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1. To detect the presence of starch added as an adulterant to the milk. 

 A Biter-proof starch added adulterants to the milk.  come animal source cow/buffalo), etc.  The pipettes, 

1 iodine solution, milk samples (minimum 3, preferably will They Addition of much increases the SNF (Solid Not Fat) content of milk. Wheat flour, I flour can be added for increasing the SNF (Solid Not Fat) content.  Starch proper synthetic milk, which is, then added to natural milk. This is commonly used opposite for the added water. Since the starch powder is easily and cheaply available, it is the adulterant to milk, after water. Procedure Measure out 3ml milk into a  test tube/container. 

2. Keep the test tube for incubation in a boiling water bath for 5 minutes. 

3. After incubation, cool the test tube, add a few (2-3) drops of 1% iodine solution and mix the contents well.  

4. Appearance of blue-black color indicates the presence of starch in milk. 

5. Note down the observations in the observation table. Figure (Observation Sample Sample 1 Sample 2 Sample 3 Conclusion: Milk sample 1 shows Milk sample 2 shows Milk sample 3 shows  Date: F If milk is contaminated  ated starch then add a drop of tincture iodine to warm milk Fig.  Experimental set up Observation (Color change - if any) Inference is adulterated not dauer wi hence, it is adulterated board hence, it is odaberuted hot a € 61