This document discusses defects in canned foods. It begins by introducing canning as a food preservation method using heat and airtight containers. Foods are categorized as low acid, acid, or high acid based on pH. Spoilage can occur if spores survive heating or from recontamination. Types of spoilage include swelling, flippers, and leakages. Spoilage is caused by thermophilic bacteria, anaerobes, or chemical reactions producing gases. The type of spoilage depends on the food's acidity and common spoilage microorganisms for each category are identified. Yeasts and molds can also cause spoilage if underprocessing or leaks occur.
Milk is a unique in that it is both consumed, as fluid milk with minimal processing and it is the raw material used to manufacture a wide variety of product.
Milk is a unique in that it is both consumed, as fluid milk with minimal processing and it is the raw material used to manufacture a wide variety of product.
detailed information about indian dairy products their manufacturing,chemical analysis,shelf life,composition,process flowchart,production and consumption of indian products, state wise production,indian products and their english counterparts
This is an exclusive ppt on packaging of meat products and covers all aspects of packaging from my course on "Technology of Meat, Fish and Poultry Products" (Bachelor's study)
A retort pouch or retortable pouch is a type of food packaging made from a laminate of flexible plastic and metal foils. It allows the sterile packaging of a wide variety of food and drink handled by aseptic processing, and is used as an alternative to traditional industrial canning methods
Canning Equipments: Construction & WorkingAbdul Rehman
Comprises of detailed theory alongwith labelled diagram of equipments used in Canning of Fruits and Vegetables. The flow chart which illustrates numerous process carried out in Canning Fruits and Vegetables.
Freezing helps to Inhibit the growth of microorganisms hence help in preservation of foods. So, freezing is a very easy and effective method for the preservation of fruits and vegetables and to retain them for longer duration.
Thermal processing is defined as the combination of temperature and time required to eliminate a desired number of microorganisms from a food product.
The term "thermal" refers to processes involving heat.
Heating food is an effective way of preserving.
The basic purpose for the thermal processing of foods is,
to reduce or destroy microbial activity,
reduce or destroy enzyme activity,
and to produce physical or chemical changes,
to make the food meet a certain quality standard.
detailed information about indian dairy products their manufacturing,chemical analysis,shelf life,composition,process flowchart,production and consumption of indian products, state wise production,indian products and their english counterparts
This is an exclusive ppt on packaging of meat products and covers all aspects of packaging from my course on "Technology of Meat, Fish and Poultry Products" (Bachelor's study)
A retort pouch or retortable pouch is a type of food packaging made from a laminate of flexible plastic and metal foils. It allows the sterile packaging of a wide variety of food and drink handled by aseptic processing, and is used as an alternative to traditional industrial canning methods
Canning Equipments: Construction & WorkingAbdul Rehman
Comprises of detailed theory alongwith labelled diagram of equipments used in Canning of Fruits and Vegetables. The flow chart which illustrates numerous process carried out in Canning Fruits and Vegetables.
Freezing helps to Inhibit the growth of microorganisms hence help in preservation of foods. So, freezing is a very easy and effective method for the preservation of fruits and vegetables and to retain them for longer duration.
Thermal processing is defined as the combination of temperature and time required to eliminate a desired number of microorganisms from a food product.
The term "thermal" refers to processes involving heat.
Heating food is an effective way of preserving.
The basic purpose for the thermal processing of foods is,
to reduce or destroy microbial activity,
reduce or destroy enzyme activity,
and to produce physical or chemical changes,
to make the food meet a certain quality standard.
WHAT IS SPOILAGE? • Spoilage is the process in which food deteriorates to the point in which it is not edible to humans or its quality of edibility becomes reduced OR • Any change which renders a product unacceptable for human consumption. • Complex event in which a combination of microbial and biochemical activities may interact. • One of the major reason that led to preservation.
FACTORS DETERMINING THE SPOILAGE • Microbial colonization depends on – characteristics of product – The way processed – The way stored • Factors are characterized into four: – Intrinsic parameters – Extrinsic parameters – Modes of preservation and processing – Implicit parameters
INTRINSIC PARAMETERS • Physical, chemical and structural properties. • Inherent in the food itself. • Important factors include water activity, acidity, redox potential, available nutrients and natural antimicrobial substances. EXTRINSIC PARAMETERS • Factors in the environment where food is stored • Temperature, humidity and atmosphere conditions.
MODES OF PRESERVATION AND PROCESSING • Physical or chemical treatment • Change characteristics of food product • Determine the micro flora associated with the product IMPLICIT PARAMETERS OR MICROBIAL INTERFERENCE • These are the result of the development of synergistic or antagonistic microbes • It can be said as the destruction of one organism by another species releasing H2 O2 , bacteriocin and other di-acetyl compounds.
• Synergistic: Production or availability of essential nutrients due to the growth of certain organisms, which allow the growth of another group which were otherwise unable to grow. • Antagonistic : Competition for essential nutrients, changes in pH value or redox potential or formation of antimicrobial substances.
TYPES OF SPOILAGE Two types of Spoilage: • Microbial spoilage • Non- Microbial Based on rate of spoilage: • Highly perishable – Meat, fish, poultry, eggs, milk, most fruits and vegetables. • Semi perishable – Potatoes, some apple varieties, nutmeats • Stable or non-perishable – Sugar, flour, dry beans
SPOILAGE OF FRUITS AND VEGETABLES • The organism responsible for taints are acid tolerant bacteria: – Lactobacillus spp. • Deterioration can be caused by action of animals, birds, bruising, wounding, cutting, freezing, dessication or other mishandling and growth of microorganisms; environmental conditions, contact with spoiled foods. • Microbial spoilage maybe due to: – Plant pathogens acting on stems, leaves, flowers or roots – Saprophytic organisms
• Types of spoilages: – Bacterial soft rot • Caused by Erwinia carotovora, ferment pectins • Pseudomonas marginalis, Bacillus and Clostridium cause water soaked appearance, a soft, mushy consistency and bad odour. – Anthracnose • Caused by Collectotrichum lindemuthianum. • Spotting of leaves and fruits – Black mold rot • Caused by Aspergillus niger • Dark brown to black masses of spores of the mold termed as smut
• Rhizopus soft rot – Caused by species of Rhizopus – Soft and mu
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2. Introduction:
• Canning is a method of preservation of food in which
the food contents is processed and sealed in airtight
containers (of metal, glass, thermo stable plastic, or
a multi- layered flexible pouch).
• Heating is the principle factor to destroy the
microorganisms and the permanent sealing is to
prevent re-infection.
3. Foods that are canned:
Low acid foods: Meat, fish, poultry, dairy fall into a pH
range of 5.0 to 6.8. This large group is commonly
referred to as the low acid group.
Acid foods: With pH values between 4.5 and 3.7. Fruits
such as pear, oranges, apricots and tomatoes fall in this
class.
High acid foods: Such as pickled products and fermented
foods. The pH values range from 3.7 down to 2.3, also Jams
and Jellies are in this classification.
4.
5. Spoilage in Canned Foods:
Spoilage of canned food occurs by:
• Survival of spores of some thermophilic bacteria
during heating of canned food.
• Recontamination of microorganism from outside
through leak in the container.
6. Spoilage of canned food according to the
condition and content of the can:
• Swell: bulging by internal pressure due to gas generated by
microbial or chemical activity.Either hard or soft swell.
• Flipper: normal appearance,oneend flips out when the can
struck against a solid object but snaps back to the normal
under light pressure.
7. 3.Springer: a can bulged from one end which if forced back into
normal position, the opposite end bulgs.
4.Leakage: perforated can.
5.Overfilled can: has convex ends due to overfilling and not
regarded as spoiled.
8. Spoilage of canned food according to the cause:
Microbial spoilage:
Major spoilage by Thermophilic spore forming Bacteria:
(a)Flat Sour Spoilage:
• mainly occurs in low acidic foods.
• caused by the species of Bacillus such as Bacillus
stearothermophillus ,Bacillus coagulans.
• the can is not swollen by gas production.
9. (b) Thermophilic anaerobic (TA) Spoilage:
• caused by thermophilic anaerobe not producing hydrogen
sulfide.
• Clostrodium thermosaccharolyticum is the main organism
involved.
• produce acid and gas in food.
• spoiled food produce sour and cheesy smell.
10. Chemical Spoilage:
(a) Hydrogen swell:
• Formation of hydrogen gas due to internal corrison or scratch.
• Occur mainly in acidic foods (canned fruits).
• Rarely in canned meat but seen in canned sardines.
11. Contd…
• Not related to fermentation or bacterial spoilage.
• Can show varying degree of bulging.
• Quite harmless but undifferentiated from swell of spoiled
can.So, it is rejected.
12. (b) Sulphur strinker spoilage:
• Desulfotomaculum nigricans is the main oragnism
involved.
• spore of this organism is usually less heat resistant than
those of flat sour and TA bacteria .
• therefore, spoilage by this organism indicates
inadequate heat treatment during canning.
13. Contd….
• organism produced hydrogen sulphide that reacts with a tin of
canned to from black spots of fees in food and the inner wall
of the can.
• Hydrogen sulphide produced give putrid odour which is
evidenced when the can is opened.
14. Classification of microbial spoilage on the basis
of acidity:
Type of food Foods Involved Type of spoilage
Low acid pH > 5.4
Medium acid pH: 5.3-4.6
Meat and fish products
milk, vegetables like corn,
lima beans, peas, meat and
vegetable mixers.
i) Thermophilic flat sour
group. (Bacillus
sterothermophilus, B.
coagulans).
ii) Sulphide spoilage
(Clostridium nigrificans, C.
bifermentans).
iii) Gas formers (Clostridium
thermosaccharolyticum).
iv) Mesophilic spoilage like
putrefactive anaerobe.
v) Spoilage and toxin
production by Clostridium
botulinum.
15. Acid food pH: 3.7-4.6 Fruits, pears, figs, tomato
etc.
i) Thermophilic
spoiler Bacillus coagulans
ii) Mesophilic spoiler B.
polymyxa, Clostridium
pasteurianum,
C. butyricum,
Lactobacilli etc.
High acid pH<3.7 Fruits like grape fruit,
citrus, rhubarb etc and
products like sauerkraut,
pickles etc.
Non-spore forming
mesophiles, yeast, mould
and/or lactic acid bacteria.
16. Spoilage by Yeasts:
• Presence of yeasts is the result of either gross
underprocessing or leakage.
• Cause swelling by the production of carbondioxide.
• Canned fruits, jams, jellies, fruits juice etc have been spoiled
by fermentative yeasts like Saccharomyces cerevisiae,
Saccharomyces pastorianus.
•
17. Spoilage by Molds:
• Aspergilus and Penicillium are most spoiling organisms.
• Molds are more common in home canned foods where
heating as well as sealing is not under total aseptic conditions.
• can grow at high sugar concentration.
• Acidification is the preventing method to prevent growth of
molds.