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Emerging Technologies for Food Processing
International Workshop: On food security through potato production
and human nutrition Bogota, Colombia, June 24-25, 2013
Hosahalli S. Ramaswamy Professor Department of Food Science McGill University
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Presentation Outline Food Security
Food Safety –Microbiological Issues
Food Processing Strategies Thermal Processing, freezing, drying Novel approaches in thermal processing Non-Thermal Processing Affordable technologies – Colombian context
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Food Security Multi-Component Concept Linked To
Production adequacy Procurement (transport, distribution) Availability (storage, preservation) Food Safety (processing) Food Quality (processing, formulations) Food diversity (processing)
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ü Prevent undesirable changes ü Wholesomeness ü Nutritive value ü Sensory qualities
ü Control activities ü Chemical ü Biochemical & Physiological ü Microbiological
Food Processing Objectives Primary: Preservation
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Food Processing Other objectives
1. Product Diversification 2. Value addition 3. Convenience Foods 4. Marketing Needs 5. Ingredients Isolation/
Synthesis 6. Non-conventional Foods
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Food Processing & Handling Objectives
Primary Safety & Stability (Preservation)
Safety Concern Eliminate or Disable Pathogens Stability
Eliminate or Disable Spoilage Organisms Inactivate enzymes Suppress chemical reactions
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Micro-organisms & Food
• Food Pathogens – public health concern because they enter the human system through food and cause various disease
• Food Poisoning Micro-organisms – these are not pathogens but produce toxins in foods which when ingested cause harm to public health
• Food Spoilage Microorganisms – these are not of public health concern, but they cause spoilage of foods
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Common Food Pathogens
• Clostridium perfringens; Campylobacter jejuni,
• Salmonella spp.; Salmonella • Escherichia coli O157:H7; Bacillus cereus • Listeria monocytogenes ; Shigella spp. • Staphylococcus aureus • Streptococcus • Vibrio; Yersinia
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Micro-organisms of Safety Concern
Exotoxins of concern
• Clostridium botulinum • Clostridium perfringens • Staphylococcus aureus • Bacillus cereus
• Mycotoxins: Aflatoxin • Natural Toxins: Alkaloids
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Numerous Outbreaks (both fresh and inadequately processed foods, examples)
Lebanon Bologna - E. coli O157:H7, 2011 Hazelnuts – E. coli O157:H7, 2011 Cheese – E. coli O157:H7, 2010 Shredded Romaine Lettuce from a Single Processing Facility - Escherichia coli O145, 2010 Beef from National Steak and Poultry - E coli O157:H7, 2010
2011 United States listeriosis outbreak from cantaloupes
2011 United States salmonellosis outbreak in cantaloupe infected with Salmonella Panama from Guatemala.
2010 Louisiana Clostridium perfringens outbreak
2010 Multihospital Outbreak of C. difficile Infection, Ohio
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Microbialogical Basis Microbial safety and stability is achieved based on combination of factors that depends : Sensitivity of microbial growth and activity to
Oxygen (aerobic, anaerobic) pH (C. botulinum) Temperature (thermo, meso, psychro) Water activity Spore vs vegetative bacteria
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Food Processing Strategies Addition of Heat: Canning (thermal processing) Removal of Heat: Refrigeration, Freezing Removal of Moisture: Drying, Frying, Extrusion Use of Radiation: Irradiation, UV, Pulsed Light Addition of preservatives Addition of salt and sugar Fermentation Alternative Heating Media: Microwave, Ohmic Non-Thermal Processing: HPP, PEF, Ozone,, PL Hurdle Technologies….. and many more
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Vacuum Sealed Cans/Pouches (Prevents the growth of Obligate Aerobes
pH pH < 4.5 High Acid Foods
pH > 4.5 Low Acid Foods
Sterilization: severe treatment
>110oC
Pasteurization: mild treatment
< 100oC
Controls pathogenic & Spooilage vegetative forms. Spore formers in-active. Shelf-stable products for fruits & acidified foods
Only pathogens Controlled. Spores active; Only short-term storage at refrigerated conditions
Spores killed: Public health concern: Clostridium botulinum; Bot Cook - 12D Process is implemented. Spoilage: Mesophiles are killed. Heat resistant thermophiles are not killed but controlled by storing the product below 30oC
Thermal Processing Principles
Pasteurization: mild treatment
< 100oC
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Retort Systems
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Quality Optimization in Thermal Processing
Today, consumers demand more than just safe foods!
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Illustration of high temperature short time (HTST) heating principle
Bot cook
Nutrient Destruction
90%
50%
10%
5%
3%T1 T2 T3 T4
Temperature (C )
Rela
tive
time
t1
t2
t3
t4
A
B
C
D
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Quality Optimization in Thermal Processing
•! All techniques used improve the heat transfer to the product which reduces the cooking time and hence improve the quality in thermally processed foods
xTkAq !
= q = h A !"#
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Agitation Processing
mg Axial Rotation
(Continuous Operation) End over end rotation
(Batch Operation)
" Two common modes of agitation/rotation
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Food Processing Optimization…
• 1) Agitation Processing
• Improves heat transfer by agitation –! Improves mixing and heat transfer coefficient –!Two Types:
•! End-over-end and Axial Agitation
q = h A !"#
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Agitation Processing
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" !ASEPTIC PROCESSING.
Aseptic Environment
Filling &
Sealing
Aseptic Product
Sterilization Sterilization
q = h A !"#
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•! 3) Thin Profile Processing •! For conduction heating foods
–! Increase surface area –! Reduce thickness
xTkAq !
=
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Semi-Rigid Plastic Containers
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Applications of novel advanced sterilization techniques
Future trends in food processing
• Microwave heating
• Radio frequency heating
• Ohmic heating
Applications of non-thermal processing techniques
• High Pressure Processing
• Pulsed Electric Field Applications
• Pulsed Light, Irradiation
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Microwave Heating: Two Modes
Ionic Polarization Dipole Rotation
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Ohmic heating
VR
Food Product
Electrode
Electrode
An electrical circuit analogue
Also called !!Direct resistance heating !!Joule effect heating !!Electro-conductive heating !!Electro-resistive heating Principle Heat generation occurs when an electric current is passed through an electrically conducting food product.
Novel Heating Techniques!.
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Typical Time Temperature Profiles under Ohmic Heating Conditions
0 10 20 30 40 50 60 70 80 90
0 5 10 15 20 25 Time (min)
50v 60v 70v 80v 100v
Tem
pera
ture
(oC
)
~
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High Pressure Processing
!! An emerging and Novel technology
!! Derived from material sciences
!! First application Hite (1899)
!! Gaining tremendous popularity in recent years
Quality Optimization: Non-thermal Processing
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Equipment Avure
STANSTED NC Hyperbaric
HP Dynamics Inc
ACB
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HPP Pilot Plant at McGill
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High Pressure Application Areas
•! Pasteurization: Juices, milk
•! Sterilization: High and low acid foods
•! Texture modification: Fish, egg, proteins, starches
•! Functional changes: Cheese, yogurt , surimi •! Specialty processes: Freezing, thawing,
fat crystallization, enhancing reaction kinetics
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Refrigeration, Cooling, Freezing
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Drying
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Edible Films for Shelf life Extension
•! Biodegradable & Edible Films or shelf-life extension of fresh and cut fruits and vegetables
0
50100
150200
250300
350
0 5 10 15
Time (Days)
Res
pira
tion
Rat
e (m
l CO
2/K
g.h)
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Affordable Technologies Conventional thermal processing Thin profile processing Acidified thermal processing Ohmic heating Use of edible coating Extrusion Technology Many drying concepts – solar, osmotic Many cooling and storage concepts Formulation - blending
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Pot in pot
cooling
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Solar water heaters & power generators
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Solar cookers
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Solar driers
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Low cost technologies for home/ community based food products
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Commercial Evaporative Coolers
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Potato Processing Cooking - consumption Cold Storage, curing Drying – potato flakes Frying – chips, French fries, patties Baking Mashed Potato Potato flour (replacement for cereal flours) Extraction – starch Potato fiber - Resistant Starch (currently
under review to be included as fiber)
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Potato Potato!
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Thank you for your patience
Gracias por la espera