<< Chapter < Page Chapter >> Page >
Warmth The temperature range between 5 and 63 degrees Celsius is rated as the danger zone because bacteria are able to grow at these temperatures. If we are able to keep the temperature either above 63 degrees Celsius or below 5 degrees Celsius, it becomes impossible for bacteria to multiply further. Boiling food at 70 degrees Celsius for at least two minutes is recommended - in this way all bacteria are destroyed.
Moisture Bacteria need moisture for their development. Have you ever wondered why biltong has such an extended shelf life? It is because there is not enough moisture in the dried meat for bacteria to flourish.
Foods rich in protein Bacteria prefer foods that have high levels of protein such as meat, eggs and fish. We can regard these foods as high-risk foods.
Time We have already stated that bacteria are able to multiply very quickly when circumstances are ideal. Food must therefore not be kept for too long under warm conditions.

People who handle food should try to avoid the following dangerous practices:

  • not cooking food for long enough;
  • preparing food and then leaving it to stand for a long time before eating it;
  • transferring bacteria from raw materials to cooked food;
  • not storing food in a freezer;
  • not thawing foods such as frozen chicken properly.

Develop the habit of studying the label on a food item properly before buying it. The label indicates the expiry date of the item for the information of the consumer. The expiry date is determined by scientists and food technologists. Later in the module you will be given an opportunity to design your own food product and then you will also have to make your own label.

It would seem that knowledge of the relationship between temperature and bacteria is important, especially with producing your own food products in view. We therefore recommend that you fill in the following table as precisely as possible:

Assignment 4:

Degrees Celsius 100; 72; 63; 37; 25; 5; 0; 18

Choose the temperature from the above table that best suits the description in the following table:

FOOD TEMPERATURE CHART
Room temperature
Freezer temperature
Freezing point of water
Boiling point of water
Pasteurization temperature
Fridge temperature
Body temperature
Very hot - bacteria are destroyed

Assignment 5:

[lo 1.2]

Form a panel of "food technologists" for a discussion on the subject Food Safety.

Suggestions for setting up the panel:

  • A panel usually comprises three to five members and has a leader who stimulates the responses of the rest of the panel by means of questions.
  • Each member is given a subdivision of the subject, which he or she has to prepare thoroughly. The group leader knows which subdivision is allocated to each of the members and prepares the questions accordingly.
  • The group leader introduces the panel to the rest of the class and begins to put the questions to the different members of the panel.
  • After the questions have been dealt with, the class has an opportunity to put further questions to the panel.

Designing your own food product

  • Steps to take during the planning and production of your food product.

Questions & Answers

if three forces F1.f2 .f3 act at a point on a Cartesian plane in the daigram .....so if the question says write down the x and y components ..... I really don't understand
Syamthanda Reply
hey , can you please explain oxidation reaction & redox ?
Boitumelo Reply
hey , can you please explain oxidation reaction and redox ?
Boitumelo
for grade 12 or grade 11?
Sibulele
the value of V1 and V2
Tumelo Reply
advantages of electrons in a circuit
Rethabile Reply
we're do you find electromagnetism past papers
Ntombifuthi
what a normal force
Tholulwazi Reply
it is the force or component of the force that the surface exert on an object incontact with it and which acts perpendicular to the surface
Sihle
what is physics?
Petrus Reply
what is the half reaction of Potassium and chlorine
Anna Reply
how to calculate coefficient of static friction
Lisa Reply
how to calculate static friction
Lisa
How to calculate a current
Tumelo
how to calculate the magnitude of horizontal component of the applied force
Mogano
How to calculate force
Monambi
a structure of a thermocouple used to measure inner temperature
Anna Reply
a fixed gas of a mass is held at standard pressure temperature of 15 degrees Celsius .Calculate the temperature of the gas in Celsius if the pressure is changed to 2×10 to the power 4
Amahle Reply
How is energy being used in bonding?
Raymond Reply
what is acceleration
Syamthanda Reply
a rate of change in velocity of an object whith respect to time
Khuthadzo
how can we find the moment of torque of a circular object
Kidist
Acceleration is a rate of change in velocity.
Justice
t =r×f
Khuthadzo
how to calculate tension by substitution
Precious Reply
hi
Shongi
hi
Leago
use fnet method. how many obects are being calculated ?
Khuthadzo
khuthadzo hii
Hulisani
how to calculate acceleration and tension force
Lungile Reply
you use Fnet equals ma , newtoms second law formula
Masego
please help me with vectors in two dimensions
Mulaudzi Reply
how to calculate normal force
Mulaudzi
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get Jobilize Job Search Mobile App in your pocket Now!

Get it on Google Play Download on the App Store Now




Source:  OpenStax, Technology grade 7. OpenStax CNX. Sep 10, 2009 Download for free at http://cnx.org/content/col11032/1.1
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Technology grade 7' conversation and receive update notifications?

Ask