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Flashcards in modified atmosphere packaging Deck (15):
1

market demands

natural
top quality
longer shelf life
convenience

2

advantages of MAP

extended shelf life
increased market areas
better use of labor and equipment
economies of scale by purchasing large quantities of raw materials
reduced transportation costs
less frequent loading display shelves and checking of sell by dates
enhancement of sales
reduction of costs associated with freezing/froze storage/distribution

3

disadvantages

cost of packaging equipment
slower throughout put of package
leakage
secondary spoilage pb
potential growth of organisms

4

methods of atmosphere modification

vacuum packaging
gas packaging
gas absorbents
gas generators

5

vacuum packaging

remove air without replacement
seals bag
up to 5x longer than refrigerated food
no freeze burn
use laminated film for strength and barrier
home/industry use

6

influence on shelf life of VP products

raw meat quality
temeprature
hygiene
tome before packaging
film permeability
shelf life approximately 6 weeks for meats

7

gas packaging

change air with new gaz
techniques:
gas flushing = VFFS, continuous flushing, fast, residual O2 2-5%
compensated vacuum = TSSF, slower, less residual O2, use for O2 sensitive products
passive modification = no equipment takes place within sealed package

8

characteristics of gas packaging

resist puncture
sealing reliabioity
anti fog
CO2 permeability
oxygen transmission rate
water vapor transmission rate

9

CO2

not inert
bacteriostatic
fungistatic
prevent insect attack
fat/water soluble
antimicrobial action = displace O2, pH reduction, disrupt ell membrane

10

O2

avoided except for color, respiration and anaerobes

11

nitrogen N2

inert, no anti microbio, filler gas

12

gas absorbents

O2 absorbents = chemical to alter atmosphere within package
iron powder, Na2S2O4
ascorbic acid, catechol
usually in sachets

13

factor influence size/type of sachets

nature of food
aw
amount of dissolved oxygen
initial level of O2 in package headspace
desired shelf life
oxygen permeability

14

advantages of O2 absorbents

non toxic
extend microbiological and chemical shelf life
replace additives/preservatives in pdt
reduce distribution losses
replace chemical pesticides

15

disadvantages

need free flow of air to scavenge O2
may cause package collapse
O2 absorbents/CO2 generators may cause flavor change
consumer resistance to sachets
expensive