Wednesday, 4 July 2012

Chemistry Project to Study the Adulterants in Food

Adulterants in Food

Name: …………………………………                 Class: XII-B

School: Bharat  Public School Year: 2011-12

Certified to be the bonafide work done by

Mr. / Miss ……………………………………………of class______________ XII – B____________

in the________ CHEMISTRY LAB_____________ during the year  2011-2012

Date____________________________________ P.G.T. in CHEMISTRY

Bharat PUBLIC SCHOOL Name of student                                                         

Submitted for ALL INDIA SENIOR SCHOOL CERTIFICATE PRACTICAL

Examination held in CHEMISTRY LAB___________________ at Bharat  PUBLIC SCHOOL

Name of student                                                          Examiner

Date__________________

Seal

I would like to express my sincere gratitude to my chemistry mentor M.rs._................., for her vital support, guidance and encouragement -without which this project would not have come forth. I would also like to express my gratitude to the lab assistant Mrs……………….. for her support during the making of this project.

S.No.
Contents
II
Page No.
I.
Objective
6
II.
Introduction
8
III.
Theory
IV.
Experiment 1
10
V.
Experiment 2
11
VI.
Experiment 3
12
VII.
Result
13
VIII.
Conclusion
14
IX.
Bibliography
15

The Objective of this project is to study some of the c.ommon…food..a.dult.erants present in different food stuffs.

Adulteration in food is normally present in its most crude form; prohibited substances are either added or partly or wholly substituted. Normally the contamination/adulteration in food is done either for financial gain or due to carelessness and lack in proper hygienic condition of processing, storing, transportation and marketing. This ultimately results that the consumer is either cheated or often become victim of diseases. Such types of adulteration are quite common in developing countries or backward countries. It is equally important for the consumer to know the common adulterants and their effect on health.

Theory

The increasing number of food producers and the outstanding amount of import foodstuffs enables the producers to mislead and cheat consumers. To differentiate those who take advantage of legal rules from the ones who commit food adulteration is very difficult. The consciousness of consumers would be crucial. Ignorance and unfair market behavior may endanger consumer health and misleading can lead to poisoning. So we need simple screening, tests for their detection.

In the past few decades, adulteration of food has become one of the serious problems. Consumption of adulterated food causes serious diseases like cancer, .diarrhoea., , .asthma., .ulcers., etc. Majority of fats, oils and butter are paraffin wax, castor oil and hydrocarbons. Red chilli powder is mixed with brick powder and pepper is mixed with dried papaya seeds. These adulterants can be easily identified by simple chemical tests.

Several agencies .have been set up by the Government of India to remove adulterants from food stuffs.

AGMARK – acronym for agricultural marketing….this organization certifies food products for their quality. Its objective is to promote the Grading and Standardization of agricultural and allied commodities.

To detect the presence of adulterants in fat, oil and butter.

REQUIREMENTS

Test-tube, acetic anhydride, conc. H2SO4, acetic acid, conc. HNO3

. PROCEDURE

Common adulterants present in ghee and oil are paraffin wax, hydrocarbons, dyes and argemone oil. These are detected as follows :

(i) Adulteration of paraffin wax and hydrocarbon in vegetable ghee
Heat small amount of vegetable ghee with acetic anhydride. Droplets
of oil floating on the surface of unused acetic anhydride indicates the
presence of wax or hydrocarbons.

(ii) Adulteration of dyes in fat

Heat 1mL of fat with a mixture of 1mL of conc. sulphuric acid and 4mL of acetic acid. Appearance of pink or red colour indicates presence of dye in fat.

(iii) Adulteration of argemone oil in edible oils

To small amount of oil in a test-tube, add few drops of conc. HNO3 and shake. Appearance of red colour in the acid layer indicates presence of argemone oil.

To detect the presence of adulterants in sugar

 REQUIREMENTS

Test-tubes, dil. HCl.

PROCEDURE

Sugar is usually contaminated with washing soda and other insoluble substances which are detected as follows :

(i) Adulteration of various insoluble substances in sugar

Take small amount of sugar in a test-tube and shake it with little water. Pure sugar dissolves in water but insoluble impurities do not dissolve.

(ii) Adulteration of chalk powder, washing soda in sugar

To small amount of sugar in a test-tube, add few drops of dil. HCl. Brisk effervescence of CO2 shows the presence of chalk powder or washing soda in the given sample of sugar.


To detect the presence of adulterants in samples of chilli powder, turmeric powder and pepper

REQUIREMENTS

Test-tubes, conc. HCl, dil. HNO3, KI solution

PROCEDURE

Common adulterants present in chilli powder, turmeric powder and pepper are red coloured lead salts, yellow lead salts and dried papaya seeds respectively. They are detected as follows :

(i) Adulteration of red lead salts in chilli powder

To a sample of chilli powder, add dil. HNO3. Filter the solution and add 2 drops of potassium iodide solution to the filtrate. Yellow ppt. indicates the presence of lead salts in chilli powder.

(ii) Adulteration of yellow lead salts to turmeric powder

To a sample of turmeric powder add conc. HCl. Appearance of magenta colour shows the presence of yellow oxides of lead in turmeric powder.

(iii) Adulteration of brick powder in red chilli powder

Add small amount of given red chilli powder in beaker containing water. Brick powder settles at the bottom while pure chilli powder floats over water.

(iv) Adulteration of dried papaya seeds in pepper

Add small amount of sample of pepper to a beaker containing water and stir with a glass rod. Dried papaya seeds being lighter float over water while pure pepper settles at the bottom.


EXPERIMENT
II
PROCEDURE
OBSERVATION
Adulteration of
Heat small amount of
Appearance of oil
paraffin wax and
vegetable ghee with acetic
floating on the
hydrocarbon in
anhydride. Droplets of oil
surface.
vegetable ghee
floating on the surface of
unused acetic anhydride
indicate the presence of wax
or hydrocarbon.
Adulteration of dyes
Heat 1mL of fat with a
Appearance of pink
in fat
mixture of 1mL of conc.
colour.
H2SO4 and 4mL of acetic acid.
Adulteration of
To small amount of oil in a
No red colour
argemone oil in edible
test tube, add few drops of
observed
oils
conc. HNO3 & shake.
Adulteration of
Take small amount of sugar
Pure sugar
various insoluble
in a test tube and shake it
dissolves in water
substances in sugar
with little water.
but insoluble
impurities do not
dissolve.
Adulteration of chalk
To small amount of sugar in a
No brisk
powder, washing soda
test tube, add a few drops of
effervescence
in sugar
dil. HCl.
observed.
Adeulteration of
To sample of turmeric
Appearance of
yellow lead salts to
powder, add conc. HCl.
magenta colour
turmeric powder
Adulteration of red
To a sample of chilli powder,
No yellow ppt.
lead salts in chilli
add dil. HNO3. Filter the
powder
solution and add 2 drops of
KI solution to the filtrate.
Adulteration of brick
Add small amount of given
Brick powder settles
powder in chilli
red chilli powder in a beaker
at the bottom while
powder
containing water.
pure chilli powder
floats over water.
Adulteration of dried
Add small amount of sample
Dried papaya seeds
papaya seeds in
of pepper to beaker
being lighter float
pepper
containing water and stir
over water while
with a glass rod.
pure pepper settles
at the bottom.

Selection of wholesome and non-adulterated food is essential for daily life to make sure that such foods do not cause any health hazard. It is not possible to ensure wholesome food only on visual examination when the toxic contaminants are present in ppm level. However, visual examination of the food before purchase makes sure to ensure absence of insects, visual fungus, foreign matters, etc. Therefore, due care taken by the consumer at the time of purchase of food after thoroughly examining can be of great help. Secondly, label declaration on packed food is very important for knowing the ingredients and nutritional value. It also helps in checking the freshness of the food and the period of best before use. The consumer should avoid taking food from an unhygienic place and food being prepared under unhygienic conditions. Such types of food may cause various diseases. Consumption of cut fruits being sold in unhygienic conditions should be avoided. It is always better to buy certified food from reputed shop.

a ENCARTA ENCYCLOPEDIA 2009

a www.wikipedia.com

a www.answers.com

a www.icbse.com

a www.google.com


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