1. OBT 554
UNIT 1
Dr K.Geetha
Associate Professor, Dept of
Biotechnology, Kamaraj College of Engg
& Tech, Madurai
2. Introduction
ο We freeze foods to extend their storage life by making them
more inert.
ο A range of physical and biochemical reactions continues
however and many of these will be influenced when
storage conditions are altered.
ο Major concern: microbiology of frozen foods since no
microorganisms grow below -10oC.
ο The production of safe frozen foods requires the same
attention to good manufacturing practice (GMP) in the
case of fresh foods.
3.
4. ο The prediction of the shelf-life of frozen foods is
difficult because of many spoilage mechanisms
present in them.
ο These include
ο enzymatic deterioration,
ο cell damage
ο protein and starch interactions
ο non-enzymatic browning
ο water migration (both during freezing and storage),
ο water re-crystallization
ο solute crystallization
ο oxidative deterioration