Upload
others
View
6
Download
0
Embed Size (px)
Citation preview
•Dose response studies to determine tolerance of fruit to irradiation
•Comparison to conventional treatments
• Effect of commercial treatment and distribution
Protocol
Irradiated at 0 and 0.4 kGy at FTSI
Shipped to Chapman by refrigerated truck
Weight loss
Internal
disorder
development
Percentage
decay
Texture
Analyzed
using a
penetrometer
Sensory
Consumer testing with
untrained panels using
9 point hedonic scales
Quality tests performed at 1, 7, and 14 days following irradiation
Peaches shipped from GA/SC to FTSI
Chemical
pH, Titratable
Acidity, Brix
Peaches
Consumers preferred Irradiated Peaches
4
a b b b ba a a a aa a a a aa a a a a0.00
1.00
2.00
3.00
4.00
5.00
6.00
7.00
8.00
9.00
OverallAppearance
Overall Flavor Overall Texture Overall Juiciness Overall Liking
Day 7 Titan Control
Day 7 Titan Irradiated
Day 13 Titan Control
Day 13 Titan Irradiated
b aa a0%
10%
20%
30%
40%
50%
60%
70%
Day 7 Day 13
Titan Control
Titan Irradiated
9 Point Hedonics
Preference
n=57
n=47
Titan - Blaze Prince
Ground shipment study: blueberries• Fresh Vaccinium ashei, Rabbiteye “Premier” blueberries harvested in
Georgia, June 2014
5
Retail display, ambient temperature
MeBr
15.56 °C and 32g/m3 for 3.5 hours
Forced air cooled to 1°C
Ground shipment to Gateway America, Gulfport, MS
Ground shipment to Chapman Univ, Orange, CA
Irradiation
Forced air cooled to 1°C
Ground shipment to Gateway America, Gulfport, MS
Gamma irradiation at 150 and 400 Gy
Ground shipment to Chapman Univ, Orange, CA
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
MeBr 150 Gy 400 Gy MeBr 150 Gy 400 Gy MeBr 150 Gy 400 Gy
Day 1 Day 3 Day 5
% D
amag
e
Retail display
Good Berries Decay Softness Physical Defects
Strawberry Air Shipment study
Transported to Chapman University
Stored overnight at 1°C
Insulated for air shipment
1 day
Unwrapped, retail display, ambient
temperature, 4 days
MeBr15.56 °C and
32g/m3 for 3.5 hours, Raymond
Express
Forced air cooled to 1°C
Irradiation Forced air cooled to 1°C
Transported to Sterigenics,
400 Gy
ControlForced air
cooled to 1°C
Freshly harvested strawberries ❖ Marquee:
June 2014, Santa Maria
❖ Amado: October and November 2014, Oxnard
-5
0
5
10
15
20
25
9am
10
am
11
am
12
pm
1p
m
2p
m
3p
m
4p
m
5p
m
11
pm
5am
11
am
5p
m
11
pm
5am
11
am
5p
m
11
pm
5am
11
am
5p
m
11
pm
5am
11
am
5p
m
11
pm
0 1 2 3 4
Air freight Control Air freight MeBr
Air freight Irradiated Refrigerated Control
Texture
0
50
100
150
200
250
Day 2 Day 4
Forc
e (
N)
Refrigerated Control Air freight contriol Air freight irradiated Air freight MeBr
Sensory
5.6
5.8
6
6.2
6.4
6.6
6.8
7
7.2
7.4
Appearance Flavor Texture Overall Liking
9-P
t. H
ed
on
ic S
cale
Marquee (trial 2) strawberries
Trial 4 Refrigerated control Trial 4 Air freight irardiated
Trial 4 Air freight MeBr Trial 4 Air freight control
0
5
10
15
20
25
30
35
40
45
Air Freight Control Air FreightIrradiation
Air Freight MethylBromide
% o
f D
amag
e
Marquee Strawberries Trial 1
0
10
20
30
40
50
60
70
80
90
Air Freight Control Air FreightIrradiation
Air Freight MethylBromide
% o
f D
amag
e
Amado Strawberries Trial 1
0
10
20
30
40
50
60
Air Freight Control Air FreightIrradiation
Air Freight MethylBromide
% o
f D
amag
e
Marquee Strawberries Trial 2
wet leaky
dry bruise
mold/decay
0
10
20
30
40
50
60
70
80
90
Air Freight Control Air FreightIrradiation
Air Freight MethylBromide
% o
f D
mag
e
Amado Strawberries Trial 2
wet leaky
dry bruise
mold/decay
Future Studies
19
Peaches
Harvest Immature
Irradiate immediately
Quality, Sensory and shelf life testing
Store at ideal temperatures
Store at commercial and/or home refrigeration temperatures
Irradiate after delay
Quality, Sensory and shelf life testing
Harvest at more mature stage
Irradiate immediately
Quality, Sensory and shelf life testing
Considerations
• Harvest times• How many varieties?• Maturity at harvest• Other qualifiers-size, color• How is the fruit packed?• Where is the product exported to?• How long does it take?
• Shipping conditions
• Storage conditions• Storage life• How is quality measured?