1 / 8

Food Preservation

Food Preservation. Isa Malik 7d. Two basic ideas behind food preservation. To slow down the activity of harmful bacteria. To kill all the bacteria and none will remain. Refrigerating and freezing.

bary
Download Presentation

Food Preservation

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Food Preservation Isa Malik 7d

  2. Two basic ideas behind food preservation • To slow down the activity of harmful bacteria. • To kill all the bacteria and none will remain.

  3. Refrigerating and freezing • One of the things that bacteria like to grow in is warm places, therefore putting food in the fridge or freezer will stop bacteria from decaying the food.

  4. CANNING • Canning food helps to preserve it because it wont be exposed to oxygen. They also add preservatives so even if there is any bacteria, it will die.

  5. Salt covering • If meat is completely covered in salt, it doesn’t allow bacteria to grow on it because its not a place where they like to grow.

  6. STERILIZATION • STERILIZING FOOD IS WHEN YOU HEAT UP FOOD UNTIL ALL THE BACTERIA IS KILLED. IT IS HEATED TO 110 TO 135 DEGREES CELSIUS FOR ABOUT 15-20 MINUTES. SOME CANNED PRODUCTS ARE HEATED FOR ABOUT AN HOUR. AFTER STERILIZING FOOD CAN BE GOOD FOR SEVERAL YEARS.

  7. Dehydrating • Dehydrating can help preserve food because bacteria needs moisture to grow, and the bacteria will come much slower which will extend the lifetime of the food.

  8. History of food preservation • In medieval times, people had to go on long travels and they obviously could not just take the meat with them as there is no way to store it. So they used salt to cover the meat which doesn’t allow bacteria to grow on it. • In France 1795 the government offered a prize of 12,000 francs to anyone who found a method to preserve food. For 14 years the prize was unclaimed. Nicolas Appert found a way of dehydrating food.

More Related