Lipids

Lipids Review

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By Nurul Hasanah

Unsaponifiable Lipids

Lipids Review

Multiple Choice

Which is the unsaponifiable lipid component

• Waxes

• Omega-3

• Terpene

• Tripalmitin

• Phospholipid

​Lipids composed of five-carbon units called isoprene

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Terpenes

Multiple Choice

IUPAC name of isoprene

• 3-methyl-1,3-butadiene

• 2-methyl-1,3-butene

• 3-methyl-1,3-butene

• 2-methyl-1,3-butadiene

• 2-methyl-3-butene

Determine the number of isoprene units and the number of carbon atoms of these compounds, then classify them !

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Phellandrene

Determine Isoprene Unit​

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​It also has isoprene units. It has 4 isoprene units

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Vitamin A

Multiple Choice

Vitamin A is classified as....

• Monoterpene

• Sesquiterpene

• Diterpene

• Sesterpene

Fill in the Blanks

Triglycerides

​Lipids Review

What is the MW of the fatty acid ? Explain how you get it !

​Cottonseed oil

​Molecular Weight of Fatty Acid Content in Oil

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​Free Fatty Acid Content

FFA = V x N x MW fatty acid x 100 %

mg sample​

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MW ​of fatty acid is the molecular weight of that contained in oil

FFA

​Always check the main component of the sample !

The main component of cottonseed oil is C18:2 so MW​ of fatty acid is 280

MW fatty acid of an oil

Open Ended

Explain how you determine free fatty acid content in a sample !

Multiple Choice

Chemical formula of C18:2

• C18H36O2

• C18H34O2

• C18H32O2

• C18H30O2

Multiple Choice

The main component of almond oil

• stearic acid

• linolenic acid

• linoleic acid

• palmitoleic acid

• oleic acid

What is the content of free fatty acid of a soybean oil if the acid value is 0,25 ? The average molecular weight of free fatty acid in the oil is 280

​Conversion

​Acid Value Conversion to FFA content

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Multiple Choice

Free fatty acid of a soybean oil is titrated by NaOH results acid value 0,25. The molecular weight of RCOOH in the oil is 280. Weight ratio of NaOH to RCOOH is...

• 1 : 5

• 1 : 6

• 1 : 7

• 1 : 8

• 1 : 10

2,8 grams of tropical oil was saponified with excess KOH 0,4855 N.  The unreacted KOH was then titrated by 3 mL of HCl 0,5150 N.  KOH was added using 23 mL volumetric pipette. Calculate SN !

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​Saponification Number (SN)

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Vb belongs to KOH or HCl ?​

Multiple Choice

2,8 grams of tropical oil was saponified with excess KOH 0,4855 N.  The unreacted KOH was then titrated by 3 mL of HCl 0,5150 N.  KOH was added using 23 mL volumetric pipette. How many is Vb ?

• 21,68 ml

• 24,40 ml

• 3,18 ml

• 25 ml

• 4 ml

Analysis Method of Triglycerides

​Lipids Review

What meaning can you conclude about the triglycerides from acid value, saponification number, iodine number, and peroxide number ?

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​Analysis parameter of oil

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Analysis parameter of oil

AV & PV

The more peroxide value, the more.....?

​Peroxide value

The more acid value, the more....?

​Acid value

Analysis parameter of oil

SN & IN

The more iodine number, the more.....?

​Iodine number

The more saponification number, the more....?

​Saponification number

Multiple Choice

Which statement is TRUE ?

• Saponification number shows the quality of oil

• Iodine number shows the quality of oil

• Saponification number shows the property of oil

• Acid value shows the property of oil

• Peroxide value shows the property of oil

What chemical properties/reaction relates with acid value, saponification number, iodine number, and peroxide number ?

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