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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?