To Test the Presence of Starch in the given Food Sample and Adulte, Biology, Class 9 Science Video Lecture | Science Class 9

to test the presence of starch in the
given food sample food is the main
source of chemical energy for all living
beings food contains the essential
nutrients for living things such as
carbohydrates fats and proteins starch
is a naturally abundant storage form of
carbohydrate in plants and animals how
can we identify the presence of starch
and food we can use iodine solution to
test for the presence of starch when
adding a few drops of iodine to a test
sample if the solution turns blue-black
it indicates the presence of starch in
the solution let's do an experiment to
identify the presence of starch in food
our aim here is to test for the presence
of starch in a given food sample tea
rules required are boiled rice or boiled
potato test tube's test tube holder
iodine solution Bunsen burner dropper
distilled water procedure take some
amount of foodstuff like potato or rice
in a test tube add 10 ml of distilled
water to the test tube and boil it for 4
to 5 minutes
thus a foodstuff solution is obtained
take out and pour some amount of the
foodstuff solution in another test tube
and keep the rest for future use after
filtration what the help of a dropper
add one or two drops of iodine solution
to the test tube observation blue-black
color appears 1 adding iodine solution
which indicates presence of starch
result the given food sample can
Dane's starch precautions a homogeneous
solution of foodstuff should be made do
not add excessive iodine solution to
avoid black coloration the test tubes
should be clean thank you mom
for this knowledge evil experiment
to test the presence of adulterant metal
nil
yellow and on pulses food is essential
to provide nutritional support for the
human body
food supplies fuel for our body by
providing it with the many nutrients
that are essential for good health due
to the increased demand for food traders
started mixing cheaper substances with
the food to increase the amount of food
available these cheaper or undesirable
substances added to the food are called
adult winds maternal yellow is a
principal non-permitted food color used
extensively in India maternal yellow is
used with Don as an adult current for
coloring how can we identify the
maternal yellow in dal we can identify
the maternal yellow in dal with the help
of concentrated HCl let's do an
experiment to identify the presence of a
dull current
maternal yellow and our pulses our aim
is to test the presence of a dull
current
maternal yellow in volume pulses the
materials required are yellow dal
concentrated hydrochloric acid and
distilled water test tubes test tube
holder dropper procedure take 5 gram of
yellow dal in a test tube add 8 to 10 ml
of distilled water to it and shake well
to make a solution separate the filtrate
in another test tube and add 2 to 3
drops of concentrated HCl to it
observation a pink or magenta color
appears which persists after dilution it
confirms the presence of methanol yellow
and our result
methanol yellow is present as an
adulterant
in yellow dal
precautions handle the test tube's
carefully shake before adding
concentrated HCl and add HCl drop-wise
carefully examine and observe the pink
or magenta color thank you ma'am
this experiment has made the concept
very easy to understand