Discuss the principles and methods of food preservation.

food preservation, any of a number of methods by which food is kept from spoilage after harvest or slaughter. Such practices date to prehistoric times. Among the oldest methods of preservation are drying, refrigeration, and fermentation. Modern methods include canning, pasteurization, freezing, irradiation, and the addition of chemicals. Advances in packaging materials have played an important role in modern food preservation.

When food is available more than the present use, it is preserved for future consumption. Foods such as fruits and vegetables have a short growing season and preservation makes them available for use throughout the year and avoids wastage of surplus crops.

Principles of Food Preservation

Prevention or delay of microbial decomposition.

By keeping out microorganisms - asepsis

By removal of microorganisms - filtration

By hindering the growth and activity of microorganisms - low temperature, drying.

By killing the microorganisms - heat or radiation.

Prevention or delay of self decomposition of food -By destruction or inactivation of food enzymes, (eg) blanching.

Prevention of damage caused by insects, animals and mechanical causes.

Methods of Food Preservation

All methods used for preserving foods are based upon the general principle of preventing or retarding the causes of spoilage. - microbial decomposition, enzymatic reactions and damage from mechanical causes insects and rodents.

Preservation by low Temperature

i. Freezing

Freezing may preserve foods for long periods of ______ ___ __________ _________ ________ ________ _____ _______ __________ ____.
______ ________ ___ _____ _______ ___ _____ ___ _______ ________ ___ ______.
______ ________ _____ _______ _________ _______ _________ _______ ______ _____.
_________ ________ _____ _______ ______ ____ ______.
_________ ___ __________ _______ _____ _____ ____ _____ ______.
___ _________ _______ ___ _______ _____ ___ _______ _____ ___ ________.
_______ _____ _____ ______ ______ ____ ____.
_________ ______ __________ _______ __________ _____ _____ _____ __________ ________ __________ _____.
_________ _____ _______ __________ _____ ____ ________ ___ __________ ______ _______.
_________ _______ __________ _________ __________ _______ ______ ________ ___ _________ _________ _________.
____ __________ _________ ______ _________ __________ _______ ___ ____ _________ _______ _____.
_______ _________ _________ _______ _______.
________ __________ ________ _________ __________ ___.
_______ ____ _____ _________ ___ _________ ______ ______.
__________ _____ __________ _______ __________.
__________ _______ ________ ______ _____.
___ ______ ______ _______ __________ _________ ____ ______ __________.
______ __________ ________ ___ _____.
________ ___ __________ _________ __________ __________.
_________ ________ ___ ____ ____ _____ _________ ________ __________.
___ __________ ______ __________ ______.
_____ ________ ____ ____ _______ _________ ___ ____ __________ _________ ____.
______ _______ ______ _________ ________ ____ ______ ________ _________.
_______ ________ __________ ____ _______ ______ _________ ________ ________ ______ ________.
____ _________ ____ _____ ________ ________ _________ ______ ______ _______ _________.
______ _______ __________ _____ ______ ____ ____ ______ _______.
___ ___ ___ _____ ___ ___ _________ _________ ______ ______ _______.
________ __________ _____ __________ _____ __________ _____ ____ _______ _____.
___ _____ _________ ________ ___ ___ ____ _____ __________.
________ ________ _______ _________ __________.
______ _______ ______ _________ ______.
______ ____ ___ ________ _____ ___ _________.
______ ______ ____ ___ ________ ___ ______ ________ ______ ___ _______.
_______ _____ _____ _______ ___ __________ ___ ________ ___ ____.
_______ ___ _______ ___ _______ _________ _______ ______ _________.
_________ _____ _______ _____ _________ _______ _________.
______ _____ _______ ____ ____ ___ ______ ____ ______.
________ ______ ______ _______ ____.
___ ____ ________ ______ ____ ______ _______ _____ _________.
_____ ___ __________ ____ _______ ___ ____ _________ __________.
_________ ______ _____ ______ ___ ______ ___ __________ ___ _______ ______.
____ ______ _________ ________ _____ ______ ________ ____ _____ ____ ______ ______.
____ _______ _____ ___ ________.
______ ________ _______ ___ ________ __________ __________ _______ _________ ____ _________ ____.
______ _____ _______ ____ _________ ____ _________ _______ _______ _______ ______ ____.
____ ____ ________ _______ ____ ____ __________ _______.
________ ___ ____ _____ _________ _______ ________ _____ _________.
________ _________ _________ _____ _______ ____ ______ __________ __________ _______ ____ ______.
_________ ____ ____ __________ __________ ______ ___ ___.
__________ ______ __________ ______ _________.
__________ ______ ________ _______ ________ _____ ________ __________ ________ ______ _________.
________ ______ _______ _________ ____ __________.
___ _____ ________ ____ _____ ___ ____ _______ _________ ___ __________.
_____ __________ ________ ______ _______ _______ __________.
__________ _______ __________ ________ _____ _________ _________ ________ _________ ___.
____ _____ ___ __________ ________ ______ _____ _______ ___.
_________ ____ ___ __________ _______ ______ _____ ____ _______ ____.
_______ __________ __________ _________ _________ ___ ______.
_________ _____ __________ ________ _______ _______ _______ _______.
__________ ________ __________ __________ _______ ___ __________ ____ ____ ________.
____ ____ ____ ________ _____ ___ _____ ________ ____ ___.
____ _________ _________ _____ ________ _______ ________ _________ ________ __________ ____ _____.
_________ ___ _________ _________ __________ _____ ___.
_____ ______ _______ _______ _____ __________ ______ ________ _______ _______ _____ __________.
______ ______ ___ ________ _______ __________ ________ __________.
___ __________ ____ __________ _______ ______ _______ ___ ___ ___ __________.
___ ____ ______ ___ ___ _______ __________ _________ ____ _____.
____ _______ _________ _____ ______ _______ _________ _________ __________.
_____ ___ __________ _________ _____ ____ _____ ____.
___ ___ ______ ______ ________ ____.
_______ ___ ___ ______ _________ _______ _____ _______ ___ _____ _______.
________ _________ ___ ______ _________ __________ ____ _______.
_________ ____ ___ __________ ___ ________ _______.
_____ ________ ________ ___ ____ ____ ___ ____ ___ ________ _________.
________ ____ ____ ___ ________ ___ ________ __________ ______ ____.
______ ____ ________ _______ ________ ________ ________ __________.
_______ _________ ________ ________ ________ _______ ______ ____.
___ _____ ___ _______ ___ ________ _______.
___ _______ ________ ______ ___ _______ _____.
____ __________ ______ __________ _________ ____ ________ ___.
____ _________ _____ _____ ______ __________ ___ _____ ________.
________ ________ ________ ______ ____.
_________ _______ _______ ____ ___ _____ ________ _____ _________ ______ __________.
________ __________ _______ _____ _____ _________.
________ ____ _______ ______ _____.
________ __________ _________ ___ ___ ___ ________ ____ _____ ________ _____.
____ _______ _______ _________ ________ ___ ______ _____ ________ ______ ______ _____.
_________ __________ ____ ______ _____ _______ _____ ___.
_______ ____ _______ _____ ______ ____ __________.
_____ __________ _______ _________ ___ _____ _____ ____ ____.
______ ________ _______ _______ _________ _______ _________ ____ _________ _________.
____ __________ __________ ________ ____ __________ __________ __________ ______ ______ __________ _________.
_______ __________ _________ ________ ______ ________.
_____ ___ ___ ________ ___ _________.
_______ _____ _________ _________ __________ ____ _________ ___ __________ ___.
_____ ________ _________ _______ _______ _________ __________.
___ __________ _________ _____ _____ ________ ___ _______ _____.
______ ______ ___ ______ ______ _______ ________.
_____ ________ _____ _____ ________ ____ ________.
________ _______ ____ _______ ________.
________ _______.
Get Full Answer on WhatsApp