Hurdle concept Flashcards

1
Q

– introduced by Leistner in 1976; the complex interactions of temperature, water activity, pH, redox potential, etc. are significant for the microbial stability of foods

A

Hurdle effect

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2
Q

Principles of hurdle technology

A

Complex interactions of temperature, pH, water activity, etc. are significant for the microbial stability

Prevents the microorganisms from multiplying and causing them to remain inactive or even die

Microorganisms should not be able to “jump over” all the hurdles present in the foods

Preservative factors or hurdles disturb the homeostasis of the microorganisms

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3
Q

The major hurdles and its applications in food preservation

A
  1. F = High temperature - heating
  2. T = Low temperature - chilling, freezing
  3. aW = Reduced water activity - drying, curing, conserving
  4. pH = increased acidity - acid addition or formation
  5. Eh = Reduced Eh - removal of O2 or addition of ascorbate
  6. Pres. = Preservatives - sorbates, nitrates, sulfites
  7. c. f. = Competitive flora - microbial fermentations
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4
Q

Symbols:

F
t
aw
pH
Eh
pres.
K-F
V
N

A

Heating
Refrigeration
Water activity
Acidification
Redox potential
Preservatives
Competitive organisms
Vitamins
Nutrients

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5
Q

Case 1

Some of the microorganisms in the area can get past a few obstacles, but none of them can clear them all at once. Food is therefore steady and secure. Because all obstacles are portrayed as having the same intensity, which is rarely the case in actuality, this scenario is simply a theoretical one.

A
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6
Q

Case 2

There are main obstacles and minor obstacles.

A
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7
Q

Case 3

Few obstacles are enough to ensure stability of the product

A
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8
Q

Case 4

Typical barriers are insufficient to stop food spoiling or food poisoning, if there are too many unwanted microbes present.

A
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9
Q

Case 5

Food is nutrient and vitamin-rich, which may permit the rapid proliferation of microbes over a short period of time.

A
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10
Q

Case 6

Microorganisms in food that have been sub-lethally harmed are demonstrated. These spores lack vitality, which are therefore hindered by fewer or lower barriers

A
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11
Q

Sterilization vs, Pasteurization in terms of elimination of microbes

A

Sterilization = total
Pasteurization = partial

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12
Q

Sterilization vs, Pasteurization in terms of processing temperatures

A

Sterilization = above 100 C
Pasteurization = below 100 C

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13
Q

Sterilization vs, Pasteurization in terms of impact on nutritional qualities

A

Sterilization = deep
Pasteurization = low

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14
Q

Sterilization vs, Pasteurization in terms of lifetime

A

Sterilization = long
Pasteurization = short

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15
Q

Sterilization vs, Pasteurization in terms of storage

A

Sterilization = room temperature (pantry)
Pasteurization = low temperature (refrigerator)

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16
Q

requires that the milk be held at a minimum of 161°F for 15 seconds

A

High-Temperature, Short Time (HSTS) pasteurization

17
Q

uses much higher temperatures varying from 275-302°F for 4-15 seconds.

A

Ultra-High Temperature (UHT) pasteurization

18
Q
  • the use of mathematical and computer modeling to describe and predict the behavior of foodborne microorganisms
  • computer-based software packages which allow the user to estimate the rate of microbial growth or get an indication of whether growth of a particular microorganism will occur under a specified set of conditions. The models are based on laboratory-generated data.
A

Predictive microbiology

19
Q

Browser for predictive microbiology

A

ComBase
Pathogen Modeling Program (PMP) Online

20
Q

a mathematical model used to describe bacterial growth, incorporating three phases: lag, exponential, and stationary, and is often used in predictive microbiology to understand and predict microbial growth in food and other environments.

A

Baranyi model

21
Q

HACCP

A

Hazard = Danger to Health
Analysis = Investigation of the hazard
Critical = Crucial for containment
Control = Handling of conditions
Points = Position in the process

22
Q

is a food safety management sytem that is used to identify and control hazards within the production and processing system.

23
Q

7 basic principles of HACCP

A
  1. Conduct a hazard analysis
  2. Identify the critical control points
  3. Establish critical limits
  4. Monitor CCP
  5. Establish corrective action
  6. Verification
  7. Documentation
24
Q

is the process to find and take necessary prevention measures

25
Q

Food safety hazards for processors to look out for

A

Biological
- bacteria
- viruses
- parasites
- molds

Chemical
- pesticides
- processing chemicals
- drug residue
- allergens

Physical
- bones
- pits
- bugs
- glass
- metal
- hair

26
Q

Examples of critical control points

A

Addition of an ingredient or preservative

Chill and refrigeration procedures

Freezing procedures to kill parasites

27
Q

describe the methods, equipment, facilities, and controls for producing processed food.

A

Good Manufacturing Practices (GMPs)

28
Q

Importance of GMP:

A
  1. extend the shelf and storage life of products
  2. reduce the risk of a product or process suspension
  3. reduce the risk of foodborne illnesses
  4. reduce product reprocessing
  5. compliance with federal and commercial product specifications
  6. reduced number of product rejections, returns, and/or complaints
29
Q

5 P’s of Good Manufacturing Practices (GMP)

A
  1. People = comprehend roles and responsibility
  2. Products = clear specifications at every phase of production
  3. Processes = properly documented, simple, and consistent
  4. Procedures = Guideline for undertaking critical processes
  5. Premises = cleanliness and equipment collaboration at all times
30
Q

Storage and transportation of food must protect against contamination and deterioration of the food and its container

A

Warehousing and distribution

31
Q

Requirements for:
Cleaning/sanitizing of physical facilities, utensils, and equipment
Storage of cleaning and sanitizing substances
Pest control
Sanitation of food contact surfaces
Storage and handling of cleaned portable equipment and utensils

A

Sanitary Operations

32
Q

Requirements for:
Water supply
Plumbing
Sewage disposal
Toilet facilities
Hand-washing facilities
Rubbish and offal disposal

A

Sanitary Facilities and Controls

33
Q

Requirements for the design, construction, and maintenance of equipment and utensils

A

Equipment and Utensils

34
Q

7 highly effective habits for home food safety

A

Habit 1: Hot or Cold Is How to Hold
Habit 2: Don’t Be a Dope, Wash with Soap
Habit 3: Watch That Plate, Don’t Cross-contaminate
Habit 4: Make it a Law – Use the Fridge to Thaw
Habit 5: More than Two Is Bad for You
Habit 6: Don’t Get Sick, Cool it Quick
Habit 7: Cook it Right Before You Take a Bite