1. Nicolas Keller, Marie-Noellë Ducamp, Didier Robert, Keller
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2. 2

3. Type of fruits and ethylene sensitivity
3
APPLE
BANANA
MANGO
TOMATO
GUAVA
JACK
GRAPE
fresh produce type ethylene production
rate (μL kg–1 h–1)
ethylene
sensitivit
y
principal
reaction to
ethylene
cherries very low <0.1 L softening
potatoes very low <0.1 M sprouting
cut flowers very low <0.1 H sleepiness, leaf curl
cucumber low 0.1–1.0 H yellowing
decay
banana moderate 1.0–10 H decay
tomato moderate 1.0–10 H shrink, decay
apricot, avocado high 10–100 H decay
apple very high >100 H scald, lose crunch
passion fruit very high >100 H decay
CAPSICUM
PINEAPPLE
ORANGE
LEMON
CHERRY
GRAPE
No “safe” level of ethylene for which no deleterious effect on postharvest.

4. Origin and Destiny of Ethylene in Air
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5. 5
Figure: Binding of ethylene molecule with the receptor “unlocks” the receptor and
leads to a chemical reaction in the plant tissue.
Chem. Rev., 2013, 113 (7), pp 5029–5070

6. 6
GENETIC
MODIFICATION
PLANT LEVEL ACTIONS
INHIBITIONS
ENVIRONMENT LEVEL ACTIONS
UV-C
CHEMICAL
TREATMENT
k VENTILATION CONTROLLED
ATMOSPHERE
AT
KMnO4 OZONE
CHEMICAL
PHOTOCATALYSIS

7. 3CH2CH2+2KMnO4 2MnO2 +3CH3CHO+2KOH 1
3CH2CHO +2KMnO4+H2O 3CH3COOH +2MnO2+2KOH 2
3CH3COOH+8KMnO4 6CO2+8MnO2+8KOH+2H2O 3
3CH2CH2 +12 KMnO 4 12MnO2+12KOH+6CO2 4
CH3COOH+ KOH KCOOCH3 + H2O 5
OVERALL REACTION
3CH2CH2 +4 KMnO4 3KCOOCH3 + 4MnO2 + KOH+ H2O 6
COMBINING WITH 1,2 AND 5
1.KMnO4
7
+H2O

8. 8
Ethylene can be removed by the use of UV-lamp.
The lamp emit ultra violet radiation which can degradation of the ethylene.
It is most efficient in 184 and 214 nm and it releases ozone as a byproduct.
Ozone is a powerful oxidant/ disinfectant which remains technically more difficult due to
its toxicity.
Ozone can control postharvest diseases on fruit, the delay of spore production from
decaying fruits, the sanitation of surfaces, and ethylene removal.
2O3 + C2H4 → 2CO2 + 2H2O
8

9. 9
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10. 10chem. Rev. 2012, 112, 5919−5948
•TiO2 exhibits strong oxidizing photoactivity when irradiated by
UV ray as OH radicals produced.
•TiO2 is stable and not soluble in H 2 O, acidic, organic solvent.
•TiO2 is a relatively inexpensive, nontoxic, and easy to handle
material.
•TiO2 is highly efficient due to high quantum yield. low toxicity,
and low cost.

11. 11
Various TiO2 –based photocatalysts have been reported for ethylene
photo degradation under UV light. The reaction of ethylene oxidation as
follows:
TiO2
1.C2H4 + 3O2 2CO2 + 2H2O
UV
2. Park et al. have reported that the photo catalytic oxidation at room temperature
is
C2H2 + O* (C2H2O)* finally CO2
3. By contrast ,Yamazaki et al. suggested that adsorbed ethylene react alcohol
radical to form ethyl alcohol radical intermediate that are subsequently react with
adsorbed super oxide radical to reach mineralization into carbon dioxide.
C2H2 +OH* C2H2OH*
C2H2OH* +O2* mineralization to CO2
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12. 1212
A significant role of water in the oxidation
process was demonstrated over the
Au/TiO2 photo catalysts

13. 13
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14. 14