CHILLING Flashcards
(25 cards)
is a very suitable food material
for the growth of microorganisms due to
its chemical composition
Meat
Meat is rich in?
- Protein
- Lipids
- Water
it makes the meat very sensitive to oxidation
Lipid
What is the process of quickly reducing the temperature of fresh products through a cooling system inside the slaughterhouse called?
it reduces the weight and color
loss of the surface.
Primary Chilling
how to determine a deteriorated meat?
- Color
- Flavor & Aroma
- Texture
- Moisture & Nutrient Content
defined as the fundamental operation in applying cold to meat to reduce it’s temperature quickly.
chamber with intensive air draught or movement.
done tru a cold
a traditional preservation method
Chilling
it nearly stops the development of surface
micro-organisms but also reduces weight loss and discoloration of the surface owing to haemoglobin oxidation
Rapid cooling
is the most common used for primary chilling
Air chilling
Enumerate the 4 Chilling Method:
- Spray chilling
- Slow chilling & traditional chilling
- Fast chilling
- Multistep chilling
Is a chilling method
that is periodically sprayed on the
carcasses combined with an air velocity of 1.5 to 3 feet/second for up to 10 hours.
take note: it uses cold water 34°F to 41°F (1°C to 5°C)
spray chilling
In spray chilling, how long should carcasses be showered with cold water, or what is the recommended time interval for spraying?
15 minutes for 60 secs for up to 10 hrs
is usually accomplished by circulating air through a forced draught cooling unit
and then over carcasses in a chilling room.
chilling
this is a chilling method
that is an atypical chilling procedure, due to its deviation from the “10/10 rule of thumb”. Typically defined as a chilling procedure where the muscle is chilled to -1 °C by 5 hour post mortem.
Fast Chilling
can be defined as a procedure whereby carcasses are chilled for
varying periods (always more than two stages) at different chilling temperatures. It’s mainly based on the principle of the first chilling the carcasses
rapidly until the ideal principle of rigor mortes is completed
Multistep chilling
The cold rooms where cooling takes place must have:
- low air temperature
- high air speed
- high relative humidity
- high cooling capacity
The primary chilling is completed when the warmest point of the carcass come to a temperature of about ?? With current
technology, these temperatures can be reached in small carcasses in 16-24 hours and in large carcasses in less than 36 hours.
7°C - for meat
3°C for the offal
Primary cooling can be done in ________ or ________. In cold rooms, this process occurs in two or three phases:
- small cold rooms
- cooling tunnels
In this phase of primary chilling
the air temperature is kept at around 0°C. Air movement is maximized to cool the carcasses efficiently.
Care must be taken to prevent superficial freezing.
first phase
in this phase of primary chilling
For large carcasses only after 10-12 hours, air circulation is reduced while maintaining the same temperature and humidity.
this phase lasts about 6 to 10 hours
second phase
in this phase of primary chilling
The carcasses are transferred to cold storage, where their temperature stabilizes.
Third phase
are usually liquids, and are used to transfer heat from the substance being cooled to a heat exchanger where the heat is absorbed by a primary
refrigerant.
air conditioning act as secondary refrigerant
Secondary refrigerants
what is the simplest secondary refrigerant that is much used in air conditioning work above 0°C.
water
In secondary refrigerant for low temperature application it uses?
- brine
- glycol
- oils
For secondary refrigerants for high temperature apllication it uses
air conditioning