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FN 132 LE #3 > FN 132_High Temperature Preservation > Flashcards

FN 132_High Temperature Preservation Flashcards

1
Q

True or False: The kind of heat for high temperature processing cannot vary.

A

FALSE; heat can vary

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2
Q

What are the characteristics of MILD HEAT?

A
  1. Kills pathogens
  2. Reduce bacterial count
  3. Inactivates enzymes
  4. Minimal damage to flavor, texture, and nutritional quality
  5. Short shelf life
  6. Another preservation must be used
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3
Q

What are the characteristics of SEVERE HEAT?

A
  1. Kills all bacteria
  2. Food will be commercially sterile
  3. Major changes in texture, flavor, and nutritional quality
  4. Long shelf life
  5. No other preservation is necessary
  6. Food is overcooked
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4
Q

True or False: There is such a thing as ‘sterile food’.

A

False; There is no such thing as sterile food but there is such a thing as commercially sterile food.

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5
Q

What are the six kinds of cooking methods?

A
  1. Baking
  2. Broiling
  3. Roasting
  4. Boiling
  5. Stewing
  6. Frying
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6
Q

Cooking is a form of what kind of treatment?

A

Mild Heat Treatment

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7
Q

Why do we cook our food?

A
  1. To make food more palatable, improve taste
  2. Alteration of color
  3. Improved digestibility
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8
Q

True or False: Cooking is a form of preservation technique.

A

False: Cooking is not a preservation technique but it destroys or reduces MOs, inactivates enzymes, and destroys toxins.

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9
Q

True or False: Cooking does not give food a long shelf life.

A

True

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10
Q

What kind of MILD HEAT TREATMENT is applied to tissue systems prior to freezing, drying, or canning?

A

Blanching

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11
Q

Explain the process of blanching.

A
  1. Let the water boil
  2. Immerse vegetables for a few minutes
  3. Remove the vegetables
  4. Immerse in cold water
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12
Q

What does blanching do prior to freezing or dehydration?

A
  • Inactivates enzymes such as (peroxidase and catalase)
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13
Q

What are the four benefits of blanching prior to canning?

A
  1. Remove tissue gases
  2. Increase temperature of the tissue
  3. Cleanse the tissue
  4. Activate or inactivate enzymes
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14
Q

What process kills part but not all of the vegetative MOs present in the food?

A

Pasteurization

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15
Q

What are five examples of supplementing pasteurization?

A
  1. Refrigeration
  2. Packaging
  3. Anaerobic conditions
  4. Drying
  5. Chemical Preservatives
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16
Q

Why is supplementing pasteurization important?

A

Because after pasteurizing we can add on these techniques to increase shelf life.

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17
Q

What is the process of inactivating microorganisms?

A

Sterilization

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18
Q

True or False: In sterilization, there is generally no need to remove thermophilic organisms which have no public health significance.

A

True

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19
Q

What do you call hot loving microorganisms?

A

Thermophilic

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20
Q

What is Commercial Sterility?

A

The condition achieved by the application of heat, sufficient alone or in combination with other ingredients and or other treatments to render the product free of MOs capable of growing in the product at non-refrigerated conditions.

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21
Q

What is the requirement for products in terms of storage conditions in Commercial Sterility?

A

Products should not be stored at a temperature of 32ºC when the MOs will germinate causing product spoilage.

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22
Q

What is the primary objective of commercially sterile foods?

A

Destroy the most heat resistant pathogenic spore-forming organisms (e.g., C. botulinum in products which > pH 4.6).

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23
Q

Botulinum is a _____________?

A

Pathogen

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24
Q

What are characteristics of botulinum?

A
  • heat resistant and spore forming
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25
Q

What happens to botulinum when exposed to adverse conditions?

A

It becomes a heat-resistant spore.

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26
Q

What is the secondary objective of commercially sterile foods?

A

Destroys vegetative and spore-forming microorganisms that cause spoilage.

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27
Q

Where is C. botulinum spp. found?

A

Soil and water.

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28
Q

Which bacterium has the ability to produce heat-resistant spores?

A

Botulism

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29
Q

The spores of C. botulinum causes __________?

A

Botulism

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30
Q

From the 7 known types of botulism, how many are able to cause illness in humans?

A

4

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31
Q

To germinate, the spores need the following conditions: a. __________ environment, b. __________ food, c. __________, d. __________.

A

a. Anaerobic
b. Low-acid
c. 4ºC to 50ºC
d. Relatively high moisture

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32
Q

Explain: If a product is not properly canned, can spores form?

A

Yes, because if not properly canned, then O2 may still be present in the can, which can lead to spore formation.

33
Q

How many mice can 1 mg of botulism toxin kill?

A

655

34
Q

True or False: Food can contain the botulism toxin without showing any signs.

A

True

35
Q

True or False: Antitoxin is available; and recovery is fast.

A

False; Recovery is slow, and permanent nerve damage may result.

36
Q

True or False: Spores do not grow in high-acid foods.

A

True

37
Q

True or False: Spores are not killed when low acid foods are heated long enough at a specific temp.

A

False; spores are killed when low acid foods are heated long enough.

38
Q

What kind of products usually do not contain C. bot?

A

Fruits

39
Q

What is the ideal temperature of processing low-acid foods to prevent botulism?

A

115ºC and above

40
Q

What instrument is used for all low-acid foods?

A

Pressure canner

41
Q

Cite examples of ways to prevent botulism.

A
  1. Properly prepare and process food
  2. Check canner for accuracy and operate it correctly
42
Q

What did the ancient people believe was the enemy of food and wine?

A

Air

43
Q

When did the Greeks seal their wine in air tight vessels using pine resin?

A

3000 years ago

44
Q

What are the two other ways how food was protected?

A
  1. Hot oil
  2. Coating with melted fat
45
Q

What way of preservation caused loss of nutrients and taste?

A

Salt

46
Q

Who started the can revolution?

A

Napoleon Bonaparte

47
Q

When did Bonaparte urge the French Government to give a prize for someone who is able to figure out how to deliver fresh food to the army?

A

1795

48
Q

When did Nicolas Appert come up with the idea of canning?

A

1809

49
Q

When did Durand adapt Appert’s idea by replacing glass bottles with tin?

A

1810

50
Q

What was canning called before?

A

Appertizing

51
Q

When did Peter Durand receive a patent for the tin-plated can?

A

1810

52
Q

What do you call the sealing for the preservation of food using various containers such as metal cans and glass canisters?

A

Hermetic sealing

53
Q

What does heat in canning do?

A
  1. Cooks the food
  2. Destroys or inactivates enzymes
  3. Destroys or inactivates microorganisms
  4. Creates a vacuum
54
Q

What kind of environment should canning produce?

A

Anaerobic Environment (absence of O2)

55
Q

What are the pH ranges for the three pH groups?

A
  1. High-acid foods: pH < 3.7
  2. Acid foods: 3.7 < pH < 4.6
  3. Low-acid foods: pH > 4.6
56
Q

True or False: For low-acid foods, if the water activity (Aw) is <0.85 then it can still be classified as an acid though pH >4.6.

A

False

57
Q

True or False: Spore-forming bacteria do not grow at pH values less than 3.7.

A

True (high-acid foods)

58
Q

What are heat processes generally based on?

A

Inactivation of yeasts or molds

59
Q

Which bacterium is the most heat-resistant, anaerobic, spore-forming pathogen, which can grow in low-acid canned foods?

A

Clostridium botulinum

60
Q

What is the process of Conventional Canning?

A
  1. Product is filled in the container
  2. Container is hermetically sealed
  3. Container and product are thermally processed at a specified time and temperature to achieve commercial sterility.
61
Q

what do you call the airtight seal in canning

A

Hermetic seal

62
Q

how to determine if hermetic sealing is good

A

% of overlap is measured

63
Q

general flow of canning line

A
  1. prepare materials
  2. bring container
  3. fill seal
  4. packaging
  5. storage
  6. distribute
  7. consume
64
Q

what is headspace

A

distance at the top of the product and bottom of the lid

65
Q

what happens if headspace is too little or too much

A
  • too little = bulge during heating
  • too much = underweight cans
66
Q

how is the most sterile environment created in canning

A

food is cooked inside the can

67
Q

Stages of canning

A

stage 1: select suitable foods in prime condition followed by preparation of food (cut, blanch, remove damage) as cleanly, rapidly and perfectly possible
stage 2: pack product in hermetically sealable containers followed by removing air and sealing the containers
stage 3: stabilize food by heat, at the same time achieving correct degree of sterilization, followed by cooling below 38 C
stage 4: store at suitable temp below 35 C to prevent growth of food spoilage microorganisms
stage 5: labeling, secondary packaging, distribution, marketing and consumption

68
Q

difference of raw and hot pack

A

RAW PACK: add very hot canning liquid to cover raw food, but leave head space
HOT PACK: raw foods are boiled 3-5 minutes in saucepan or blancher then poured into jars

69
Q

disadvantages of raw and hot pack

A

RAW PACK: floating food, air bubbles, discoloration over time
HOT PACK: texture loss

70
Q

what is added as suspending medium

A

brine/syrup

71
Q

purpose of brine/syrup

A
  • add flavor
  • conservation of natural flavor
  • mask metallic flavor
  • strengthen fruit tissue and prevent disintegration
  • fix color
72
Q

what is exhaustion

A

removal of air from containers before sealing

73
Q

steps in sealing

A
  1. remove air bubbles
  2. wipe rim
  3. preheat lid (soften sealing compound)
  4. attach lid
  5. after processing, hear seal “pop” remove screw band
74
Q

difference in sealing at home and industrial sealing

A

at home = use spoon
industrial = exhaustion

75
Q

methods of exhaustion

A
  • hot filling food into container
  • cold filling food then heating container with contents (80-95C) with lid partially sealed
  • mechanical removal of air
76
Q

why are foods immediately cooled after sterilization

A

to induce thermal shock

77
Q

two methods of canning

A
  • boiling water canning = used for high acid foods
  • pressure canning = used for low acid foods
78
Q
A

FN 132 LE #3 (6 decks)

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