A
class practical on testing the presence of starch in food was performed using
Foldscope by students of 6
 
 th
 
 semester.


 
 Requirements:
 
 Potato tuber, razor blade, cover slip, water, iodine solution, microscope,
blotting paper, foldscope


 
 Principle:
 
 Iodine
reacts with starch and changes its colour to blue-black


 
 Procedure:
 

<ol>
 <li>
 Cut a thin section of a potato tube by
means of razor blade or gently scrap out a few potato cells
 </li>
 <li>
 Place them in a drop of water over a
glass slide.
 </li>
 <li>
 Observe under microscope. The cells of
tuber are seen full of starch grains.
 </li>
 <li>
 Pour a drop of iodine solution at one
end of the mount and drain out the water from other end by means of filter
paper.
 </li>
 <li>
 Observe the change in colour.
 </li>
</ol>

 
 Observations
 
 : The starch grains are seen to change colour to blue – black

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 </li>
</ul>

Using Foldscope as tool in class room teaching @GGDSD College, Chandigarh

SD_28

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