x ray & infrared food preservation technology
TRANSCRIPT
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This is Supun
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New approac
h?
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Consult
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Analysis Results
Infrared Food Preserving
Pulse X ray Package
Sterilizing
Prof Dexter(WUSL)
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Wave Length30cm -740nm
Temperature above 5K emit IR
Infrared?What is
Frequency3GHz up to about 400THz
Comparatively Low frequency High wavelength to X rays
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Infrared?Classification
IR
Near IR Medium IR Far IR
0.75-1.4 μm 1.4 – 3 μm 3 - 1000 μm
Industrially IR Emitters are designed according to these categories.
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Mode of ActionInfrared
Causes vibration and rotation of
molecules Absorb E Heat
H20 Most AffectedOther moleculesProtiens , Lipids, CHO with polar groups (-NH, -CO, -OH, C=C)
DNA and RNA can be damaged/ Ribosomes/Cell envelop/ proteins
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Inactivation Depends?
• IR power level• Temperature of food
sample• Peak wave length• Type of Micro organism• Affect of moisture
content• Depth of food item
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Technological ApplicationsInfrared
IR Dry Blanching
IR Drying & Dehydratio
n
Combined IR & Hot Air
Drying
Combined IR & Freeze
DryingIR Baking IR Peeling
Roasting Sterilization
Pasterization
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Technological ApplicationsInfrared
Drying• Fruits• Vegetables• Fish• Pasta
Baking• Pizza• Bread• Biscuit
Roasting, Pasteurization, Sterilization• Coffee• Cacao• Cereals & Nuts• Meat
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Pros?IR
Uniformity heatingHigh quality dry food productionLow costQuick methodLoss of solids is lowPortability SafeNon toxic ,no harmful side effects to human or environmentSurface colour development
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Cons?IR
Low penetration powerEye & Skin hazardsLimited applications in liquidsHurdles are neededLess consumer awareness
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Higher energy100eV – 100KeV
Short Wave Length
(0.01 - 10 nm)
Bremssthrahlung X-rays
X Rays?What are
High Frequency3 x 1016 – 3 x 1019
Hz
Comparatively High frequency Low wavelength to IR
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X ray• A pulse of high intensity• Pulses in gigawatt range• Opening time 30ns to few
ns
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X Rays Produced?How
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X Rays Effective?WHY
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Mold Potato Sprouts
Salmonella Spp.
In Fully Packaged Form
All destroyed by X ray
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Mode of Action
Direct
Indirect
As a result of energy deposition by the radiation on
the target molecule
Reactive diffusible free radicals formedfrom the radiolysis of water
OH- , eaq-, H202
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*Overall Similar to other radiation but difference makes with pulsing and how it generates
High penetrating power
Switch on–switch off capability No Radio active residues
High throughput
ProsPulse X Rays
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Technically complex Low Consumer AcceptabilityNo more than 7.5 Mev usedOnly used to PACKAGED Food
ConsPulse X Rays
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Less consumer demand?
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“Many studies have shown that ions, excited atoms and molecules generated during irradiation have no toxic effect on humans.”
-FDA
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Thank You !Any Questions?