title food preservation is prevent from microbes

it is the presentation on the topic of food preservation

1. Introduction Welcome everyone, today we are going to understand a topic “ Food preservation “. Through this presentation we will going to delve into food preservation and some old modern techniques of preserving food and preservatives and how they works.

2. Contents: What is food preservation? Why we need food preservation? What are preservatives? Food preservation in ancient time? Different methods of food preservation? _ Drying _ Salting _Sugaring _Fermentation _Freezing _Pasteurization _What preservative used in which food?

3. What is food preservation? Food preservation is the method of preserving food in a order to prevent it from decaying and from other microbes like fungus and bacteria.

4. Why we need food preservation? It helps to increase food supply during shortage period. It increases self life of food. It reduces the cost of food. So that we can enjoy seasonal fruits and vegetables. Personal satisfaction. Food is easily available

5. What are preservatives? The substances that are added to our food to prevent it from spoilage and harmful microbes like fungus and bacteria. These substances known as preservatives.

6. Different methods of food preservation Drying is the process of preserving food by removing water and moisture from it. It is done by various methods like sun drying, air drying and drying near an open fire. Salting is one of the widely used for preservation method since ancient time. It is mostly used for preserving fish and meat. Ancient culture have used sugar as a preservative. Sugar draws water away from the microbes, leaving them dehydrated. Fermentation is a metabolic process that converts sugar into alcohol. It takes place in the absence of oxygen. Freezing is the idea to stop bacterial and fungal infection. Freezing reduces water activity and reduce temperature. Therefore, it prevent food from microbes. Pasteurization (heat process) kill the bacteria that are harmful pathogens and can spoil our food.

7. What preservative used in which food? Oil and salt are used for preserving pickles . Sugar are used for conserving jellies and jams .Pasteurisation is a method of preserving food by heating like milk Freezing is a method of preserving food because it reduces the temperature which prevent food from microbes