This document discusses common frauds in the sale of livestock, livestock products, milk, ghee, and meat. It describes several methods used to adulterate these products, such as altering the description of livestock, reducing fat or adding thickeners to milk, adding vegetable oils to ghee, and mixing meats from different animals. It also provides details on detection techniques for these frauds, including physical examination, chemical tests, serological tests, chromatography, electrophoresis, and analyzing enzyme profiles. Penalties are outlined for food adulteration under Indian law.
PRESENTATION ON VETERINARY INTERNSHIP PROGRAMME 2011-12Ashraful Alam
This Presentation is partial document of my internship activities that I have done at different placement during the last ten month out of one year long internship program as fulfillment of five years long DVM course
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This Presentation is partial document of my internship activities that I have done at different placement during the last ten month out of one year long internship program as fulfillment of five years long DVM course
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Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
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Learning Objectives:
Describe the primary categories of smells and the concept of odor blindness.
Explain the structure and location of the olfactory membrane and mucosa, including the types and roles of cells involved in olfaction.
Describe the pathway and mechanisms of olfactory signal transmission from the olfactory receptors to the brain.
Illustrate the biochemical cascade triggered by odorant binding to olfactory receptors, including the role of G-proteins and second messengers in generating an action potential.
Identify different types of olfactory disorders such as anosmia, hyposmia, hyperosmia, and dysosmia, including their potential causes.
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Olfactory Genes:
3% of the human genome accounts for olfactory genes.
400 genes for odorant receptors.
Olfactory Membrane:
Located in the superior part of the nasal cavity.
Medially: Folds downward along the superior septum.
Laterally: Folds over the superior turbinate and upper surface of the middle turbinate.
Total surface area: 5-10 square centimeters.
Olfactory Mucosa:
Olfactory Cells: Bipolar nerve cells derived from the CNS (100 million), with 4-25 olfactory cilia per cell.
Sustentacular Cells: Produce mucus and maintain ionic and molecular environment.
Basal Cells: Replace worn-out olfactory cells with an average lifespan of 1-2 months.
Bowman’s Gland: Secretes mucus.
Stimulation of Olfactory Cells:
Odorant dissolves in mucus and attaches to receptors on olfactory cilia.
Involves a cascade effect through G-proteins and second messengers, leading to depolarization and action potential generation in the olfactory nerve.
Quality of a Good Odorant:
Small (3-20 Carbon atoms), volatile, water-soluble, and lipid-soluble.
Facilitated by odorant-binding proteins in mucus.
Membrane Potential and Action Potential:
Resting membrane potential: -55mV.
Action potential frequency in the olfactory nerve increases with odorant strength.
Adaptation Towards the Sense of Smell:
Rapid adaptation within the first second, with further slow adaptation.
Psychological adaptation greater than receptor adaptation, involving feedback inhibition from the central nervous system.
Primary Sensations of Smell:
Camphoraceous, Musky, Floral, Pepperminty, Ethereal, Pungent, Putrid.
Odor Detection Threshold:
Examples: Hydrogen sulfide (0.0005 ppm), Methyl-mercaptan (0.002 ppm).
Some toxic substances are odorless at lethal concentrations.
Characteristics of Smell:
Odor blindness for single substances due to lack of appropriate receptor protein.
Behavioral and emotional influences of smell.
Transmission of Olfactory Signals:
From olfactory cells to glomeruli in the olfactory bulb, involving lateral inhibition.
Primitive, less old, and new olfactory systems with different path
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1. Common Frauds In The Sale Of
Livestock & Livestock Products
Vivek Joshi
PhD Scholar
VMD, IVRI
Assignment (VMD-681)
2. Frauds in the sale of livestock
• Alteration of Description
1. Castration of entire
2. Clipping of mane and tail
3. Docking
4. Colouring of white patches by hair dye
5. Bishoping
6. Covering chronic ulcers & fistulae with colored
mud
Section 420 IPC : fine/ 7 yrs.
4. Frauds in the sale of milk
1. Reduction of fat
2. Addition of thickening agents
3. Addition of colouring agents
4. Addition of preservatives
5. Addition of urea
6. Accidental adulteration
7. Addition of heated milk
5. 1. Reduction of fat
I. Watering
II. Skimming of milk
III. Skimming and watering
6. I. Watering
• Milk dilution by water
• Dangerous → germs from polluted water
• Density change → atleast 15% water addition
• 10% water → 0.003 g/cucm ↓ milk density
• Detection by:
a) Specific gravity
b) Solid-not-fat (SNF)
c) Nitrates in milk
7.
8. II. Skimming of milk
• Milk fat removed
• Easily detectable as:
↑ Specific gravity
↓ TF
↑ SNF
• % fat deficiency = 100 (3- F)
3
where, F = % fat in milk sample ( Gerber’s method)
9. III. Skimming and watering
• Specific gravity → Normal
• ↓ Viscosity : Thickening agents added (starch,
gelatin, cane sugar)
• Detection of thickening agents → sure sign of Double
fraud
• Detection :
a) Total solids in milk
% TS = Wt. of solids after evaporation x 100
Wt. of milk taken
(Gravimetric method)
12. 3. Addition of colouring agents
• Annatto & Coal tar dyes
• Purpose :
a. to make milk more attractive
Detection of Annatto dye in milk
10ml milk in test tube
10ml ether/ shake/ keep for 5 min.
Ether separates on top & becomes yellow (+)
13. 4. Addition of preservatives
• Boric acid/ Borax/ Formalin/ Salicylic acid/ Benzoic
acid/ Hydrogen peroxide/ Sodium carbonate/
bicarbonate
• Purpose :
a. Prolonging period of sweetness of milk
b. Bacterial destruction
c. Delaying milk curdling
• Harmful effects :
a. Poisonous → unfit for human consumption
b. Interference in normal digestion process
16. 7. Addition of heated milk
STORCH’S TEST
5 ml milk
1 drop 0.2% hydrogen peroxide sol.
+
2 drops 2% paraphenylenediamine HCl
Shake
Blue colour
(Heated at < 172° F )
Clear greyish-blue colour
(Heated at ≥ 172° F )
17. Synthetic Milk
• artificially manufactured by combining different low-grade
substances (vegetable oil, detergent, urea) → appearance of
natural milk → lack milk's nutritional components and taste
• Origin : Milkmen in Kurukshetra (Haryana state) 15 years ago
HARMFUL EFFECTS
Food poisoning / GI
complications
Heart problems
Tissue damage Cancer
Proteins destruction Death
18. Synthetic vs Natural milk
SYNTHETIC MILK NATURAL MILK
COLOUR White White
TASTE Extremely bitter Palatable
ODOUR Soapy Milky
TEXTURE Soapy feeling when
rubbed between
fingers
No soapy feeling
pH 9.0-10.5 6.6-6.8
UREA TEST + Faint
SUGAR TEST + -
NEUTRALIZER TEST + -
VEGETABLE FAT TEST + -
20. Frauds in the sale of ghee
1. Addition of vegetable oils
2. Addition of hydrogenated oils
3. Addition of animal fats
common
21. 1. Addition of vegetable oils
• Phytosteryl → (+) in vegetable fat → (-) in ghee
• Detection :
PHYTOSTERYL ACETATE TEST
Interpretation:
Unadulterated ghee MP = 114-115°F
Addition of vegetable
oil
MP > 117°F
22. 2. Addition of hydrogenated oils
• Sesame oil → (+) in vegetable ghee
• Adulteration with vegetable ghee if sesame oil (+) in pure
ghee
• Detection:
23. 3. Addition of animal fats
• Adulteration with mutton or beef fat
• Detection :
TEST
1 ml metled ghee + 15 ml mixture of acetate and alcohol
Water bath at 30°C/ 3 hrs
Deposition of crystals (+)
25. Introduction
Falsification of Meat
• mixing meat of different animals
or
• mixing inferior/ undesirable meat with superior/ costly
meat
• eg :
a) Beef with horse flesh
b) Mutton with chevon
c) Rabbit meat with cat’s flesh
26. Detection of Meat falsification
1. Physical examination
2. Chemical examination
3. Serological examination
4. Enzyme profiles
27. 1. Physical examination
MUTTON CHEVON PORK DOG
MEAT
BEEF HORSE
MEAT
POULTRY
MEAT
FISH
MEAT
COLOR Dark red Pale White-
grey
Dark
red
Red-
brown
Dark
red
- White
ODOUR Ammoni-
-acal
Buck Urine - - - - -
FAT
DEPOT
B/W
muscles
Little in
muscles
Mixed
with
muscle
Mixed
with
muscle
Mixed
with
muscle
- Mixed
with
muscle
Finely
distrib.
FAT
COLOR
White - White White Yellow Golden
- dark
yellow
- -
BONE
MARROW
Red - Pink-
red
- White-
red
Greasy - -
CONSIST. Firm - Soft - Firm - Firm -
28. 2. Chemical examination
a) Glycogen test
• Horse meat → Glycogen ↑
• Also, flesh of fetuses/ starved calves/ dogs/ pig liver
a) Test for animal fats
i. Linolenic acid test : Horse fat → 1-2%
Others → < 0.1%
ii. Iodine value : amount of iodine absorbed by UFAs in
fat
S.NO. ANIMAL IODINE VALUE
1. Ox 38-46
2. Horse 71-86
3. Sheep 35-46
4. Pig 50-70
29. c) Refractive index estimation
• Fat converted into liquid and refractive index
measured
Chemical tests : Not conclusive → Serological tests req.
S.NO. ANIMAL FAT REFRACTIVE INDEX
1. Ox < 40
2. Horse 35.5
3. Pig < 51.9
30. 3. Serological examination
a) Precipitation tests
• commonly used
• Principle : Abs develop in blood of animal if given repeated
injections of meat extract of another animal
• Abs are species-specific
• Done in raw meat only
• Differentiation of meats of distantly zoologically related animals
• Demerit : Not specific for closely related animals (horse &
donkey; sheep & goat)
• Raw meat + Antisera → Precipitin lines
(extraction with water/ saline) (raised in rabbits)
Closely related meats → length of time req. for reaction
31. contd…
S.NO. Meat differentiation Method
1. Mutton and Beef Shunmugan and
Ranganathan, 1972
2. Cattle, Buffalo, Goat and Deer Pinto, 1961
3. Different spp. Agar-gel diffusion
method
(van den Heever, 1962)
32. Chromatography
i. Paper chromatography
• Beef & Whale meat → No difference in aa except Histidine
• Histidine : Whale meat Beef/ horse meat/ pork/ mutton˂
• Whale meat mixing → differentiation based on ↓ histidine
i. Gas chromatography
• Differentiation of horse meat/ pork/ beef → unsaponifiable
matter
i. Thin layer chromatography
• Differentiation of cattle/ sheep/ whale meat → various
contents of dipeptides
33. Electrophoresis
• Starch gel electrophoresis (SGE) : water soluble
proteins
• PAGE : differentiation of meats of cattle/ pig/ horse/
kangaroo
Electrophoretic patterns : Skeletal & Cardiac
muscles → species specific
34. 4. Enzyme profiles
• Muscle estrase enzyme patterns : SGE in water
soluble extracts of superficial muscle
• Each age/ sex → species specificity of estrase
enzyme patterns (mobility/ position of enzymic
bands)
35. Food Adulteration Punishment
Section 272
Imprisonment of either
description for a term
which may extend to 6
months
Fine which may extend
to Rs. 1000
Both
Food Safety and Standards Act, 2006
No injury Non-grievous
injury
Grievous injury Death
6 months/ Rs. 1
lac
1 yr/ Rs. 3 lac 6 yr/ Rs. 5 lac Not less than 7
yrs/
imprisonment
for life/ not less
than 10 lac