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FDSC251 > Autoxidation > Flashcards

Autoxidation Flashcards

1
Q

To initiate an autoxidation reaction, hydrogen has to abstracted from a fatty acid from: A. The carboxylic end of the fatty acid B. The CH3 end of the fatty acid C. A double bound within the fatty acid

A

c

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2
Q

The abstraction of a hydrogen converts a fatty acid into: A. An aldehyde B. A Ketone C. A free radical D. An

A

C

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3
Q

When a free radical reacts with molecular oxygen it will produce: A. A epoxy radical B. A hydroperoxide C. An alkoxy group

A

A

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4
Q

An alkyl, carbon and hydrogen chain, group singular bonded to oxygen :

A

alkoxy radical

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5
Q

Milli-equivalents of peroxide oxygen per 1000 grams of fat is:

A

PV value

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6
Q

A fatty acid is more susceptible to autoxidation with an increased number of:

A

db

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7
Q

After abstraction of hydrogen, the double bond is saturated

A

False

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8
Q

Singlet Oxygen is a form of Oxygen that is: A. High in energy B. Far more reactive toward organic compounds C. Slightly different in its physical properties from the prevalent form or Oxygen D. Produced by photochemical reactions in the oil sample E. All of them F. None of them

A

E. all

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9
Q

T or F : Beta scission is a reaction that leads to the splitting of the C-C bond

A

True

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10
Q

The undesirable off-flavors and odors associated with oxidized fats and oils is called:

A

rancidity

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11
Q

T or F : Oils are bottled in dark glass containers to protect them from autoxidation

A

T

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12
Q

When the two electrons in a cleaved covalent bond are divided equally between the products, the reaction is called:

A

homolytic cleavage

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13
Q

Homolytic cleavage results in the formation of:

A

free radical

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14
Q

The peroxy radical is formed as a result of: A. Abstraction of hydrogen from a fatty acid B. Reaction fatty acid radical with oxygen C. Both of them D. None of them

A

B

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15
Q

T or F : The peroxy radicals are stable molecules

A

F

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16
Q

T or F : The formation of peroxides is infinite

A

F

17
Q

Aldehydes resulting from the decomposition of the alkoxy radical can produce alcohols by:

A

reduction

18
Q

At low concentrations of hydroperoxides the dominant reaction is the:

A

monomolecular

19
Q

T or F : The PV increases linearly with time

A

false

20
Q

Thiobarbituric Acid Test measures the concentration of

A

malonaldehyde

21
Q

Increased number of double bonds increases autoxidation rate due to increased ……. structures in the FA.

A

resonance

22
Q

…… is needed to produce singlet oxygen during a photochemical reaction

A

energy

23
Q

T or F : Linolenic acid hydroperoxides will start to breakdown very early during autoxidation.

A

T

24
Q

T or F : Chelating agents are true anti-oxidants.

A

False, synergistic agents

25
Q

Which antioxidant is this?

A

Gossypol

26
Q

What is this molecule? Why is it relevant to oxidation

A

2-(2-pentenyl)-furan. It is relevant because it is the common molecule found in all rancid oil and it is the reason for the reversion flavor of soybean oil

27
Q

T or F : freezing an oil reduces the autoxidation rate

A

false

28
Q

Why does transformers need to be monitered ?

A

becuse no oxygen and the H˚ from homolytic cleavage can recombine into H2 and buildup of gas can make the transgormer explode

29
Q

What are the primary oxidation compounds?

A

hydroperoxide (ROOH) and peroxides (ROOR)

30
Q

T or F : the monomolecular reactions give peroxy ROO˚ radicals

A

false, the monomoleculare rxn (ROOH –> RO˚ + OH˚) while the bimoleculare reaction (2ROOH –> ROO˚ + RO˚ + H2O)

31
Q

What is measured when we measure the PV

A

the primary oxidation products (hydroperoxide : ROOH)

32
Q

What is the formula of the PV?

A

2 KI + 2 R-O-O-H → I2 + 2 KOH + 2 R-O-H

33
Q

What is special that can happen during the termination step of linoleic aicd?

A

Dimer fromation

34
Q
A

FDSC251 (22 decks)

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