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FST490 - Exam #2, set 2
Processing & shelf-life stability
26
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Undergraduate 4
05/17/2010

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Term
What is shelf life?
Definition
it is a function of the
environmental conditions and the
quality change that can be allowed
Term
What is the main factor when determining if something is fresh?
Definition
the % of customers you will dissatisfy.
Term
What does FIFO stand for?
Definition
First in, first out
Term
What does LSLFO stand for?
Definition
least shelf life, first out
Term
What are some shelf life factors that come from processing of foods?
Definition
Different tech's, component stability, different food matrices
Term
What are some shelf life factors that come from the storage of foods?
Definition
Different storage, packaging affects, many unknowns.
Term
What is the conventional and
widely proven model that is used to predict temperature effects for many processes?
Definition
Arrhenius model
Term
Dp=?
Definition
decimal reduction time at absolute pressure P
Term
Do=?
Definition
decimal reduction time at reference pressure Po
Term
Ko = ?
Definition
reaction rate constant at reference pressure Po
Term
V = ?
Definition
activation volume constant
Term
T = ?
Definition
Absolute temperature
Term
Zp = ?
Definition
pressure increase for one log cycle reduction in DP
Term
What affect does moiture have on shelf stability?
Definition
The less moisture, to a point, is ideal for shelf stability. But if you are below Aw of 0.2, shelf life will decrease. Yhis is because metals will become unstable and will want to oxidize.
Term
dw/dt = ?
Definition
g water gain/loss
Term
k/x = ?
Definition
film permeability
Term
Pw,out = ?
Definition
vapor pressure, external
Term
Pw,in = ?
Definition
vapor pressure, in package
Term
A = ?
Definition
package surface area
Term
Ws = ?
Definition
Weight of solids
Term
What are the affects of acrylamide?
Definition
• Neurological consequences
• Reduced fertility
• Effects on germ cells
• Potential carcinogen
Term
What food was found to have the highest concentration of acrylamide in it?
Definition
Chips
Term
Which fast food chain was found to have the most acrylamide in its foods?
Definition
Popeyes
Term
What kind of potato flakes had the least amount of acrylamide in them? Which ones had the highest?
Definition
prebacked had lowest; cooked at 215F for 6.5mins had highest.
Term
Does asparagine have an effect on how much acrylamide will be present in the food?
Definition
YES!
Term
Does the temp and length time at which potato chips are cooked have an effect on the concentration of acrylamide in the chip?
Definition
Yes, as temp and time increases, so does the concentration.
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