Qualitative Analysis of Oils and Fats Flashcards
How many calories comes from fats?
20-35% of calories
are triesters of glycerol and higher fatty acids
FATS AND OILS
one type of clear butter used in South Asian cookin
GHEE
animal ghee
DESI GHEE
vegetable ghee
VANASPATI GHEE
TRUE OR FALSE:
Fats are solids while oils are liquids at ordinary temperature.
TRUE
TRUE OR FALSE:
Fats and oils are a mixture of triglycerides.
TRUE
made up of three fatty acids linked to glycerol by fatty acyl esters
TRIGLYCERIDES
are long chain hydrocarbons with carboxyl groups (COOH groups)
FATTY ACIDS
contain only single bond between the carbon atoms and tend to be solids at room temperature
SATURATED FATTY ACIDS
contain double bonds between the carbon atom in addition to the single bonds present in the fatty acid chain. They are likely to exists as liquids at room temperature
UNSATURATED FATTY ACIDS
associated with health problems and cardiovascular diseases
TRANS FATTY ACIDS
The double bonds present in the naturally occurring unsaturated fats are in the
CIS FORM
Unsaturated fatty acids can be converted into saturated by the process of
HYDROGENATION
Depending upon the degree of unsaturation, the fatty acids can combine with ____________________________________———————————————————–to form saturated fatty acids.
OXYGEN OR HALOGEN
the number of grams of iodine consumed by 100g of fat
IODINE NUMBER
TRUE OR FALSE
A higher iodine value indicates a higher degree of unsaturation.
TRUE
The presence of lipids in the qualitative analysis is measured by the
COLOR CHANGE
This test detects the solubility of lipid in various solvents to check whether it is miscible or immiscible in polar or non-polar solvents.
SOLUBILITY TEST
based on the property of lipid to dissolve in different solvents.
SOLUBILITY TEST
are readily miscible in non-polar solvents like chloroform, partially soluble in a polar solvent like ethanol and immiscible in a polar solvent like water.
LIPIDS
TRUE OR FALSE
**Lipids are soluble in non-polar solvent i.e. chloroform and partially soluble in ethanol which can solubilize upon heating. **
TRUE
TRUE OR FALSE
**Lipids are insoluble in non-polar solvent i.e. chloroform and partially soluble in ethanol which can solubilize upon heating. **
FALSE
TRUE OR FALSE
Lipids are soluble in polar solvent like water.
FALSE
TRUE OR FALSE
Lipids are insoluble in a polar solvent like water.
TRUE
TRUE OR FALSE
Oils and fats are soluble in organic solvents like, chloroform, alcohol etc. but are insoluble in water.
TRUE
test for the lipids which can be detected by the appearance of a translucent and greasy spot.
TRANSLUSCENT SPOT TEST
What is the principle of the Transcluscent spot test?
The lipid will form a greasy spot as they are having a greasy texture that will penetrate into the filter paper.
TRUE OR FALSE
Fats and oils have higher boiling points so at room temperature they cannot absorb enough heat to evaporate.
TRUE
TRUE OR FALSE
When fat or oil is place on a sheet of paper, it diffracts light, which becomes the TRANSLUSCENT SPOT.
TRUE
used to detect the presence of glycerol or fat
ACROLEIN TEST
What is the dehydrating agent in the acrolein test?
potassium bisulphate (KHSO4)
It is the portion of the potassium bisulfate that is dehydrated to form an an unsaturated aldehyde
GLYCEROL PORTION
the glycerol portion of the molecule is dehydrated to form an unsaturated aldehyde called
ACROLEIN
TRUE OR FALSE
Potassium bisulfate is both a strong acid, and strong dehydrating reagent.
TRUE
It has a characteristic sharp irritating odor.
acrolein
used to detect the presence of sesame oil
BAUDOUIN TEST
Sesame oil gives a characteristic _____________________________———————————with concentrated hydrochloric acid and furfural solution
ROSE RED COLOR
used to detect the degree of unsaturation in oil or fat.
HUBLE’S TEST
TRUE OR FALSE:
During the Huble’s test reaction, the violet colour of iodine fades away if the oil or fat is unsaturated.
TRUE
TRUE OR FALSE:
During the Huble’s test reaction, the violet colour of iodine fades away if the oil or fat is saturated.
FALSE
TRUE OR FALSE:
In Huble’s test, if the oil or fat is unsaturated, the violet colour of iodine persists.
FALSE
TRUE OR FALSE:
Saturated fatty acids will not give the halogenation reaction.
TRUE
TRUE OR FALSE:
Saturated fatty acids will give the halogenation reaction.
FALSE
TRUE OR FALSE
Saturated fats are of animal origin and are usually present in solid form
TRUE
TRUE OR FALSE
Unaturated fats are of animal origin and are usually present in solid form
FALSE
Unsaturated fat is found in fish like salmon and tuna, nuts, seeds etc.
TRUE
