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Food Safety and Testing - PowerPoint PPT Presentation


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Food Safety and Testing. Dr Jennifer Newton BSc, MSc, PhD Managing Director. Very, very small. Bacteria are everywhere!. Reproduction by Bacteria. Replication. Binary Fission. Exponential Growth of Bacteria. 2. 4. 40 minutes. 8. 1 hour. 16. 1 hour 20 minutes. 32.

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Presentation Transcript
slide1

Food Safety and Testing

Dr Jennifer Newton BSc, MSc, PhD

Managing Director

slide5

Reproduction by Bacteria

Replication

Binary Fission

slide6

Exponential Growth of Bacteria

2

4

40 minutes

8

1 hour

16

1 hour 20 minutes

32

1 hour 40 minutes

64

2 hours

128

2 hour 20 minutes

256

2 hour 40 minutes

512

3 hours

1024

3 hours 20 minutes

2048

3 hours 40 minutes

4096

4 hours

8192

4 hours 20 minutes

16384

4 hours 40 minutes

32,768

5 hours

1

20 minutes

to put it another way
To put it another way,...

In one day one bacteria will produce 10,000,000,000,000,000,000,000

That would take humans 1,520 years

how do we keep food safe
How do we Keep Food Safe?
  • Separation of low – risk from high risk
    • High Risk those foods people will eat without heating (ready to eat)
    • Low Risk those foods people usually do not eat without cooking; e.g. raw meat
  • Good personal hygiene
  • Cleaning
  • Pest Control
  • Proper temperature control
slide9

Above 80C most

bacteria die

Room temperature

and body temperature

most bacteria grow

very qickly

Below 0C most

bacteria

also do not multiply

Temperature and Bacteria

slide10

Controlling Bacteria’s Growth

Heating to very hot

Freezing

Chilling

Use of chemicals (acid e.g. vinegar, preservatives, salt)

slide11

How do we know for certain

if food is safe to eat?

Have a laboratory test it.

Food with disease causing

bacteria in it tastes and smells

the same as food without it.