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INTRODUCTION
Food - necessity of life
Food - consumed to sustain life
Food - any substance when ingested, usually will
supply nutrients that nourish body.
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Introduction - Contd
Nutrients
Furnish oxidative energy required to fuel body
activities
carbohydrates, fats
Provide materials for building and/or
maintenance of body tissues
proteins, mineral elements
Supply substances that act as regulators for
body processes
water, vitamins
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FOOD PROCESSING
Any operation or operations that change value of
food
Range - Simple washing to complicated processes
of food preservation, developing new products
Objectives
Enhancement in shelf life
Consumer convenience
Preservation of nutrients
Development of new products
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Food Processing – contd.
Food processing industry credited with:
All treatments received by food from its origin
(land or sea) to point in space and time when
consumed
Almost all foods subject to processing
Food processing studied under Food Science
and Technology.
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FOOD SCIENCE
Emerged as discipline in early 1950’s -
accumulation of scientific information on food
Defined as:
body of coherent and systematic knowledge
that deals with understanding the nature of
food, composition of food materials and their
behaviour under various conditions to which
they may be subjected.
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Food Science – Contd.
Involves knowledge about:
Nature of food
Composition of food
Behaviour under different conditions of processing,
preservation and storage
Causes of spoilage
Principles underlying methods of processing and
preservation
Food Science also concerned with improving
quality of product so it reaches consumer in
attractive, safe, nutritious form.
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FOOD SCIENCE AND TECHNOLOGY
Terms Food Science and Food Technology often
used synonymously
Describe whole set of changes through which food
passes from harvesting to consumption
Food Science and Technology
Defined as the application of physics, chemistry,
microbiology, engineering and nutrition to the
handling, processing and storage of foods.
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FOOD SCIENCE AND TECHNOLOGY (Contd….)
By definition, food scientist or food technologist
expected to be conversant with problems
connected with:
Understanding nature of food
Handling food
Processing food
Storage of food.
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FOOD SCIENCE AND TECHNOLOGY (Conted….)
Subject vast, problems complex
Hence multidisciplinary approach essential
Usually team of food scientists and technologists
work together with experts in other disciplines to
run food processing industry
Career in Food Science and Technology demands:
Broad educational background
Ability to apply knowledge whenever and
wherever need arises.
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FOOD SCIENTIST AND TECHNOLOGIST
Responsibilities:
Safety
Taste
Appearance
Nutrition of processed foods.
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FOOD SCIENTIST AND TECHNOLOGIST
Job of Food Technologist
Select new and proper raw materials
Know fundamental changes in composition and
physical condition of foodstuffs occurring during
and subsequent to industrial processing
Understand and control food manufacturing
operations
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FOOD SCIENTIST AND TECHNOLOGIST
Develop:
New products
New processes
New equipment
Solve technical problems associated with:
Food manufacturing
Food processing
Food storage
Food distribution.
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FOOD SCIENTIST AND TECHNOLOGIST
Special attention and priorities
Food safety
Research on emerging pathogens
Research on food toxicology
Better detection methods for food-borne pathogens
and toxins
Research on food allergies and sensitivities
Research on hazards to special population groups.
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RELATIONSHIP WITH OTHER DISCIPLINES
Food Science and Technology involves:
Application of knowledge of basic and applied
sciences to study:
Handling, processing, storage and
distribution of foods
Primarily two distinct aspects recognized: -
Scientific aspects
Technological aspects.
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RELATIONSHIP WITH OTHER DISCIPLINES
Food Science concerned with understanding:
Nature of food
Causes of spoilage
Closely related to physics, chemistry and biology
Technological areas require knowledge in:
Engineering
Processing
Manufacturing
Packaging
Sanitation
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RELATIONSHIP WITH OTHER DISCIPLINES
Food Science and Technology made up of several
components:
- Food chemistry
- Biochemistry
- Food microbiology
- Sensory analysis
- Food engineering
- Packaging
- Sanitation.
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RELATIONSHIP WITH OTHER DISCIPLINES
Physics
Basic principles underlying heat exchange
(cooling, heating), evaporation, etc., discovered
Discovery of semi-conductors, transistors and
chips led to revolution
Food analysis equipment developed by physicists
- Measuring pH, relative humidity, permeability of
gases and moisture in packaging materials,
techniques for assessing texture of raw and
processed foods
Irradiation preservation, microwave heating.
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RELATIONSHIP WITH OTHER DISCIPLINES Contd
Chemistry
Food molecules complex
Also changes occurring complex
Reactions during spoilage and processing of
chemical or biochemical nature
Study of food chemistry very complicated
Methods of food analysis based on:
Characteristic properties of specific chemical
groups like amino, carbonyl, carboxylic,
phenolic and others - methods evolved, in part,
by chemists.
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RELATIONSHIP WITH OTHER DISCIPLINES - cont
Biochemistry
Changes in foods of biochemical nature
Ripening process
Spoilage of fruits and vegetable
Study and analysis of enzymes and flavouring
components involve aspects of biochemistry
Polymer chemistry - promoted production of
tailor-made, non-rigid, plastic packages -
protect foods from oxidative rancidity and loss
of moisture vapours
Knowledge of chemistry and biochemistry of
immense value to food technologist.
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RELATIONSHIP WITH OTHER DISCIPLINES - cont
Biology – Several biological sciences significant
Breeding of new varieties suitable for processing -
know-how of botany, plant breeding, genetics and
plant physiology necessary
Plant pathology, entomology and parasitology -
essential to grow healthy plants and animals
Also required to save commodities from attack of
pests in field and storage chambers
Human physiology necessary to understand how
food will act inside body - nutrition
Establish processes that inactivate or destroy
antinutrient factors or fortify foods.
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RELATIONSHIP WITH OTHER DISCIPLINES contd
Microbiology
Important biological science associated with Food
Science and Technology.
Microorganisms
Chief spoilage agents
Control desirable for food industry to thrive:
Pasteurization
Sterilization
Use of chemicals
Irradiation, etc.
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RELATIONSHIP WITH OTHER DISCIPLINES contd
Microbiology
Exploit yeast in production of:
Leavened bread Alcoholic beverages
Use lactic acid bacteria in:
Dairy products - Yoghurt, Cheese
Meat products - Sausages
Vegetable products – Pickles
Fruit products - Pickles
Exploit microorganisms in production of:
Organic acids, antibiotics, enzymes, vitamins,
steroids, etc.
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RELATIONSHIP WITH OTHER DISCIPLINES - (cont)
Technological Aspects
Engineering
Designing and maintenance of commercial food
processing plants and equipment
Fabrication of equipment for conversion of raw
agricultural commodities into finished products
Development of appropriate technology to
overcome short-term supply and long term-
shortage
Applications of computer technology, microwave
heating and other similar techniques.
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RELATIONSHIP WITH OTHER DISCIPLINES - contd
Engineering
Advances in thermal processing by engineers
Areas in which engineering sciences
indispensable:
Heat and mass transfer of food materials
Process flow for batch and continuous
processes
Plant and factory design
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RELATIONSHIP WITH OTHER DISCIPLINES - (contd)
Engineering
Several branches essential
Chemical, biochemical, electrical, electronics
and mechanical
Develop processes and equipment for
commercial plants
"Food Process Engineering“ - Educational
programme in Food Technology heavily
weighted with courses found in chemical
engineering curriculum
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RELATIONSHIP WITH OTHER DISCIPLINES - contd
Computer Sciences
Computers influenced methodology of
analytical and industrial instrumentation:
Facilitate industrial operations
Control inventory, process and quality
Enabled development of new tools:
Powerful capabilities for studying
physiochemical properties of materials:
particularly at microscopic, submicroscopic and
molecular levels
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RELATIONSHIP WITH OTHER DISCIPLINES contd
Computer Science
Modern instrumentation developed with
computer assistance
Spectroscopy
Microscopy
Calorimetry
Rheological analysis.
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RELATIONSHIP WITH OTHER DISCIPLINES contd
Computer Science
Computers used for data:
Storage Retrieval
Transmission Analysis
Used for molecular modeling, allow much
improved insights into molecular architecture
and behaviour of molecules
At present such modeling difficult for complex
systems such as foods, considerable progress
made.
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Educational Institutions
Food Science and Technology being offered in Pakistan
at Diploma level (DAE):
1. College of Technology Faisalabad
2. College of Technology, Sahiwal
3. College of Technology, Nowshera
4. Women Polytechnic Karachi (female students)
At university level – B.Sc., B.Sc. Hons, M.Sc., Ph.D.
College of Agriculture (BZU) Multan
College of Agriculture Dera Ghazi Khan
Islamia University, Bahawalpur
offer introductory courses in Food Technology for B.Sc.
(Hons.) Agriculture programme.
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Educational Institutions - contd
Universities awarding degrees
1. University of Agriculture Faisalabad 2 programs
2. Barani Agric University Rawalpindi - major
3. University of Sargodha Sargodha – 4 years
4. Sindh Agricultural University Tandojam – two
programs
5. University of Karachi, Karachi – 3 & 4 years
6. NWFP Agricultural University Peshawar - major
7. Gomal University D.I. Khan - major
8. Univ of Azad Jammu and Kashmir Muzaffarabad
(College of Agriculture, Rawalakot – major
9. International University, Gilgit – 4 years
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Career in Food Industry - contd
Graduates found in the country and abroad in:
Industry
Educational institutions
Research institutes
Government organisations
NGOs
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Career in Food Industry - contd
Food processing industry
Largest industry in world in terms of
manpower employed,
Ranks second in Pakistan
Food technologists engaged in processing
plants to convert raw food into products:
Beverages Breakfast cereals
Baked goods Dairy products
Pickles Jams
Snacks Convenience foods
Meat products
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Career in Food Industry - contd
Engaged in food ingredient plants to process and
manufacture:
Salt
Pepper
Spices
Flavours
Colours
Preservatives
Antioxidants
Others products
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Career in Food Industry - contd
Work in quality assurance:
Secure that food in every stage of processing
meets government and consumer standards
Busy in quality control:
Raw materials, ingredients, packaging
materials, in-process testing, final batch
release, ensure shelf life of processed
products
Work in product development:
No limit to number of ways food supply can
be used
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Career in Food Industry - contd
Prepare new products, standardise recipes
In process development responsible for
innovations in processes
On processing floor busy in controlling:
Men
Machines
Materials
to guarantee production of safe, nourishing
products.
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Career in Food Industry - contd
Number of food technologists diversifying
expertise by gaining an MBA degree
Work in managerial cadre in food industry
Find jobs as technical sales executives:
Food processing equipment
Ingredients
Other supplies
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Career in Food Service Organisations
Multinational food restaurants demand food
technologists - Organizations such as:
KFC
McDonald
Pizza Hut
Uno Chicago Grill
Others
Employ food technologists in:
Quality assurance
Product development
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Career in teaching institutions
Academic positions where subject offered
Instructor in Polytechnics - DAE sufficient
Minimum master’s degree required in University
In academic institutions, assigned various courses
for teaching
Keep themselves abreast with latest developments
in discipline
Job description in universities also includes
conducting and supervising research.
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Career in Research Institutes
Government research institutes employ food
technologists as Scientific Officers or equivalent
PCSIR Laboratories
Pakistan Atomic Energy Commission Labs
Pakistan Agricultural Research Council
Agricultural Research Institutes
Main thrust - Conduct basic and applied research
in food chemistry, food microbiology, nutrition, food
toxicology and product development
PAEC Labs busy in research on irradiation of local
foods
Postgraduate degree preferred qualification.
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Career in Other Organisations
Extension wing of Provincial Agriculture
Departments as Agricultural Officers
NGOs employ in social action programmes
Some pass civil service examination
Some set up own business, running successfully
Work independently as consultants guiding food
industry
Many overseas - Middle East, Europe, USA,
Canada, Australia, other parts of world.
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Potential Openings
Job opportunities should be available in:
Export Promotion Bureau of Pakistan
Public Analyst Laboratories
Provincial Food Departments
Local Governments
Ministry of Agriculture
Other similar organisations
Presently few food technologist found in these due
to basic entry requirements framed a few decades
ago.
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Potential Openings continued....
Large catering organisations, chain restaurants,
airlines demand new, more convenient and greater
variety of foods
Health institutions (hospitals) require formulation of
healthful diets for healthy and sick with
specifications - less sodium, sugar, fat and
cholesterol
Food scientists can find openings in these quite
attractive, interesting and challenging.
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Professional Society
Pakistan Society of Food Scientists and
Technologists (PSFST)
Established in 1990
Affiliated with IFT (USA)
The professional body of food scientists and
technologists in Pakistan
Head Office - National Institute of Food Science
and Technology, University of Agriculture,
Faisalabad.
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PROFESSIONAL SOCIETY contd....
Objectives of the Society:
To promote the cause of Food Science and
Technology and Nutrition.
To improve the professional competence of Food
Scientists and Technologists.
To provide professional communications through
technical publications, scientific meetings,
seminars, symposia, lectures, workshops, etc.
To encourage education and training at all levels
in various fields of Food Science & Technology.
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PROFESSIONAL SOCIETY contd..
Society creating strong links between:
Private (food, allied industries) and
Public sectors (universities and research institutions)
Holds annual Food Science Conferences
Publishes Pakistan Journal of Food Sciences
Membership categories
Professional
Associate
Student
Emeritus
Honorary
Life
Corporate Member
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Professional Society – contd …
President
Founding President from 1990 to 1997 - Prof. Dr.
Muhammad Shafiq Chaudhry (Lahore)
Prof. Dr. Muhammad Saeed (Peshawar) 1998–99
Dr. Wazir Hussain Shah (Lahore) 2000 - date
Secretary
Prof. Dr. Javaid Aziz Awan (Faisalabad) - 1990–99
Prof. Dr. Faqir Muhammad Anjum (Faisalabad)
2000 - date
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End of Chapter 1
Next
Food Sources and World Food
Situation