saving the harvest through chemical postharvest technologies :linus opara
TRANSCRIPT
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•Faculty of AgriSciences
Saving the Harvest Through Innovative Postharvest
Technologies
Umezuruike Linus OparaDistinguished Professor &
DST/NRF South African Research Chair in Postharvest Technology
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Towards Sustainable Food Chains
1) What is the nature and extent of the food chain sustainability challenge and what role for innovation in postharvest technology?
2) How can we harness postharvest technologies to address the nutrition and poverty dimensions of food security?
3) What are the needs and opportunities to reducepostharvest food losses and waste?
4) Can Africa feed itself (& the world), sustainably?
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Sour
ce: F
AO
Sta
tistic
s
A GLOBAL FRESH FOOD REVOLUTION
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Grains Meat, Fish and Dairy
Valu
e-ad
ding
Fruit & Vegetablesthreshing
packagingcold storage
Controlled atmospheremodified atmosphere
transporttruck, ship, rail
airfreight
Postharvest Technology, Food Value Chain Improvementand Economic Development
Perishables orientedDurables oriented
Productionoriented
Postharvestoriented
drying
milling
baking
brewing
fermentation
storage freezingpickling
Freeze-drying
Minimal processing, ready-to-eat
industrial manufacturing
health-foods
hurdle technologies
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Postharvest Technologies to Reduce Food Losses and Waste
Problem Solution Technology
Physiological ageing and disorders
Control the environment
Control the atmosphere
Regulate biosynthetic pathways/action
Refrigerated storageHyperbaric storageLow oxygen atmosphereHigh nitrogen atmosphere
Ethylene treatmentDiphenylamine (DPA)1-MCP treatment
Pests and diseases
Agri-food chemicals Pesticides, Fungicides,Bactericides, Ozone, Chlorine, Waxes/coatingsHot airHot water
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Problem Solution Technology
Mechanical damage
Packaging
Reduce handling forcesImpact, compression, vibration
Ventilated packagingModified atmosphereActive packagingIntelligent packaging
Cushioning, PaddingDeceleration
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Coors Brewing Company introduced a Vented Wide Mouth™ can
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Individual fruit
Internal packaging
Carton/box
Pallet stack
Refrigerated shipping container
Reefer ship
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•Faculty of AgriSciences
Postharvest Technology
of Pomegranates
-a value chain approach
050
100150200250300350400450
18701890191019301950197019902010
Num
ber
of p
ublic
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02468
101214
1990 2000 2010 2020
Year of publication
Num
ber
of p
ublic
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ns
Pomegranates+Postharvest
Pomegranates
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Managing Maturity for Optimal Postharvest Handling, Nutrition and Health
1. Fawole OA. Opara UL. 2014. British Food Journal, 116(3): 544-567. 2. Fawole OA. Opara UL. 2013. Scientia Horticulturae 150(4): 37-46. 3. Fawole OA. Opara UL. 2013. Scientia Horticulturae 159: 152–161.4. Fawole OA. Opara UL. 2013. South African Journal of Botany 85:23–31. 5. Fawole OA. Opara UL. 2013. Industrial Crops and Products 47: 300 - 309.6. Fawole OA. Opara UL. 2013. Scientia Horticulturae 157: 90-98.7. Fawole OA. Opara UL. 2013. Journal of Food Science 78(8):S1264-72.8. Fawole OA, Opara UL. 2013. African Journal of Biotechnology 12(25): 4006-4019. 9. Fawole, O.A. and U.L. Opara. 2012. British Food Journal 114(11):1518-1532. 10. Fawole, O.A., U.L. Opara, K.I. Theron. 2012. Food Bioprocess and Technology 5(2):425-444.11. Fawole, O.A., N.P. Makunga, U.L. Opara. 2012. BMC Complementary and Alternative Medicine 12:200
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The search for science-based tools toassess fruit readiness for harvest
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Harvest time (DAFB)
Physico-chemical properties
167 – 175
(H2)
TSS: ≥ 16ºBrix
Juice content: ≥ 65 mL/100 g aril
A practical guideline – harvest index
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Linking Optimal Postharvest Handling to Human Nutrition and Health
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1. Caleb, O.J., U.L. Opara et al. 2012. Journal of Food Science 77(4): E80–E87. 2. Caleb, O.J., U.L. Opara, C.R. Witthuhn. 2012. Food and Bioprocess Technology 5(1):15-30.3. Caleb, O.J., U.L. Opara et al. 2012. Postharvest Biology and Technology 64(1):49-544. Caleb, O.J., U.L. Opara et al. 2013. CyTA Journal of Food 11(3):199-207.5. Caleb, O.J., U.L. Opara et al. 2013. International Journal of Food Science and Technology, 48(11): 2315–23236. Caleb, O.J., U.L. Opara et al. 2013. Postharvest Biology and Technology 79: 54-61. 7. Caleb, O.J., P.V. Pramod, FAJ Al-Said, U.L. Opara. 2013. Food and Bioprocess Technology 6(2): 303-329.
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MarketingProduce
Physiology
Converting technology
Polymer engineering
Consumer demand
Environment
Role of Technological Innovation on Packaging of the Future
Information & Communication
technology
BiotechnologyNanotechnology
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MAP Design• Amount of arils (g)• Physiology of arils• Permeability of polymeric film to gases/ vapour• Package geometry and size (volume)
FlavourAppearance
Texture100%0% 50%
Postharvest life
Convenient, smart, intelligent packaging
Flavour life < Postharvest life
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Air Albedo Arils0
10
20
30
40
50
60
X-R
ay C
T ca
lcul
ated
vol
ume (
mm
3 )
Air Albedo Arils0
10
20
30
40
50
60
Fruit part
Act
ual v
olum
e (m
m3 )
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Prof. Bart NicolaiDr Pieter VerbovenDr Bert VerlindenDr Thijs DefraeyDr Alex AmbawDr Delele Mulugeta
Dr Qian ZouDr David TannerMrYun LuMr Colis Blake (Award)