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International Journal of Science and Research (IJSR)
ISSN: 2319-7064
ResearchGate Impact Factor (2018): 0.28 | SJIF (2019): 7.583
Volume 9 Issue 3, March 2020
www.ijsr.net
Licensed Under Creative Commons Attribution CC BY
Advances in Meat Preservation and Safety
Rajendran Chellaiah1, Mahesh Shanmugasundaram2, Jayathilakan Kizhekkedath3
1, 2, 3Freeze Drying and Animal Products Technology Division (FDAPT), Defence Food Research Laboratory (DFRL), Defence Research &
Development Organisation (DRDO), Siddhartha Nagar, Mysore- 570011, INDIA
Abstract: Meat preservation is an ancient old technological development. The foremost aspects of meat preservation are mainly
focused to delay of microbial spoilage and chemical reaction, and protect the meat from losing its weight and also if any change in taste
and texture. Majorly, two different technological aspects are followed both thermal and non-thermal processing of meat preservation.
Each technique involved is considered as a hurdle to minimise microbial proliferation and combinations of process called hurdle
technology, which can be applied to achieve preservative qualities in meat preservation. The empirical observation that drying and
salting, would preserve meat without refrigeration was made several thousands of years ago. This reviews deals majorly about the
thermal and non-thermal technologies available to date and their advantages and disadvantages of meat preservation envisaged.
Keywords: Meat preservation, Thermal, Nonthermal, Hurdle
1. Introduction
Meat can be stored safely for long periods by following the
correct hygienic procedures. This includes that the surfaces
which are exposed during meat processing should have a
high degree of cleanliness. The reason for the preservation
of meat is in preventing contamination and delay of spoilage
by microbial enzymes and inherent enzymes of meat from
damaging it. Meat preservation depends on procedures and
processes to manage microbial growth and the effect of
enzymes on meat [1]. To maintain the aseptic conditions,
natural coverings like shell of egg, fat or skin of animals
occur while the artificial covering includes maintenance of
cold chain, sugar, canning, picking etc.
1.1 Precautions for food storage
The food storage area should be well lit, good air circulation
and absence of drips. Floors should be well drained.
Prepared food should be kept on clean racks. Raw food
should not touch cooked food because there are chances of
cross contamination at the floor level.
Foods like milk and meat should be stored below
refrigerated temperature while frozen foods are kept at -
180C. Hot foods should be stored hot while the cold foods
should be kept cold. Cooked foods must be consumed after
preparation otherwise should be kept at higher than 60°C. If
the foods are only warmed and not heated there is a chance
of multiplication of microbes [2].
1.2 Various methods of food preservation
There are some other methods of food preservation that are
used in the food industry and require special equipment, for
example, irradiation and vacuum packing. Irradiation is the
process of exposing food to ionising radiation in order to
destroy microorganisms. Vacuum packing depends on the
removal of oxygen from food packaging to prevent the
growth of aerobic bacteria that will decompose the food.
1.3 Thermal Methods
a) Preserving by Drying (Dehydrating)
Drying has been used since time immemorial for preserving
herbs, fruits, vegetables and meats. If the moisture content is
10-20% by weight, then the bacteria cannot multiply and the
enzymes are inactivated [3]. One traditional form of dried
food is quanta. Quanta are made from sliced meat which is
hung in the air to dry. A more modern method of drying is to
use an electric dehydrating machine. Modern drying
techniques make use of fans and heaters in controlled
environments. Drying can be done at home using your stove
and oven. Cut meat into narrow strips with a cross section of
1cm x 1cm. Boil for 5 minutes to kill bacteria and bake in an
oven. Meat dehydrated this way will last 1-2 months in air-
tight containers without refrigeration [4].
b) Preserving by Canning
Canning is a popular way of preserving fruits, vegetables
and meats. Cans, plastic container and glass jars are suitable
for canning. They are lowered in a container with hot water
for 10 minutes with the lids and cooled immediately to 380C
[5]. Oxygen is removed during this process. Any bulged can
is not good for consumption. Since some organisms can
survive canning process other additives are also added.
Some familiar examples of the former class of food
additives are sodium benzoate and benzoic acid; calcium,
sodium propionate, and propionic acid; calcium, potassium,
sodium sorbate, and sorbic acid; and sodium and potassium
sulphite, calcium, sodium ascorbate, and ascorbic acid
(vitamin C); butylated hydroxyanisole (BHA) and butylated
hydroxytoluene (BHT); lecithin; and sodium and potassium
sulphite and sulphur dioxide [6]. Benzoic acid, citric acid,
propionic acid, sorbic acid and their salts are effective mold
inhibitors. Acetic acid and lactic acid prevent the bacterial
growth whereas sorbate and acetate are capable of arresting
the growth of yeasts in food [7].
Hot, high-pressure steam cooks, seals and sterilizes the meat
in the canning jars. Use either the hot pack or raw pack
method to preserve poultry. The hot pack method is best for
the cut meat. During this process the meat is processed by
roasting, stewing in little fat. In raw pack method, boiling
meat broth, tomato juice, or water, is added to the top of the
poultry [8]
Paper ID: SR20326194523
DOI: 10.21275/SR20326194523
1499
International Journal of Science and Research (IJSR)
ISSN: 2319-7064
ResearchGate Impact Factor (2018): 0.28 | SJIF (2019): 7.583
Volume 9 Issue 3, March 2020
www.ijsr.net
Licensed Under Creative Commons Attribution CC BY
c) Preservation by smoking
Smoke is an ancient preservative technique as earlier as man
had started consumption of meat. The food is exposed to
smoke from burning wood or any other plant materials. This
method helps to preserve the food partially by surface drying
in which the moisture is removed from the surface, but this
cannot be reliable one for preservation unless this can be
combined with either salting or drying method. It also keeps
the meat tender if the smoke is not hot enough to cook the
meat [9]. Smoking causes the outer covering to dry so that
the moisture level would be reduced to a stage at which
bacteria cannot enter. This also can be processed in
combination with salting method. Common smoking
methods are hot smoking, smoke roasting and cold smoking.
Smoke roasting and hot smoking both the methods cook the
meat whereas the cold smoking does not cook the meat.
When the meat is processed through cold smoking, it should
be dried quickly to limit the bacterial growth by making it
jerky or by slicing it thinly. Also should take care of the
smoking by not directly smoke with wood smoke as it leads
to develop food with carcinogenic polycyclic aromatic
hydrocarbons [10].
d) Cold smoking
This involves saturating the meat to smoke at a optimum
temperature ranges from 75°F to 120°F (23.8°C to 48.88°C)
after partially or fully cured. In this process, the meat is
usually be hung or placed on racks, and allowed to be
smoked for days instead of hours which resulted the product
either completely raw or partially cooked. This when
combined with salt curing, the product will remain edible
and tasty for a year or longer without the need of
refrigerated condition. This technology can be utilised for all
types of meat including poultry, fish and game [11].
e) Hot smoking
Hot smoking is done with temperatures ranges from 140°F
to 200°F (60°C to 93.33°C). Here in this method, without
curing, the meat will be hot smoked with mild addition of
salting to inhibit bacterial growth during the smoking
process. Then after it is hot smoked for several hours finally
before consumption. In addition to flavouring and smoke
based preservatives, hot smoking is used to dry the meat
further with the famous double smoked red herring. These
meats are completely cured before smoking.
In both processes, the meat is completely dried at the top of
the surface before smoked. In few cases cold smoking is
followed by a period of hot smoking. The smoking process,
either one process gives best flavours to the meat, which
improve the shelf life and can last for 1-2 months in a air
tight container [12].
1.4 Non -Thermal Methods
a) Preservation by Freezing method
This is one of the best methods of preservation of foodstuffs
including all types of meat and this method preserve as
equally as to natural state by slowing down the enzymatic
reactions and growth of microbes. But the organisms will be
deactivated rather than killed and possibly could be activated
once the frozen product is thawed. Microorganisms such as
bacteria and yeast grow well at specific temperatures usually
between 40-140º F (4.4°C -60°C). By lowering the
temperature approximately Under freezing condition that is
below below 4°C (40ºF), their multiplication will
significantly be arrested without killing them instead making
them slow spoilage. Critically a minimum storage
temperature of no less than 10°F (-12°C) is important for
longer shelf life with desired characteristics without losing
flavour. But this could be possible only with the availability
of a freezer and reliable power uninterrupted power supply
[13].
The meat or cut portions should be wrapped with freezer
paper or bags to prevent freezer burn and also to make sure
for air tightness to avoid contamination. Uncooked meat
such as steaks or chops could be frozen safely for 4-12
months and further uncooked ground meat also could safely
be stored for 3-4 months whereas the cooked meat can be
stored for 2-3 months. Hotdogs, ham and lunch meats can be
frozen for 1-2 months but the poultry meat of both cooked
and uncooked may be stored for 3-12 months. Also, wild
game may be kept for 8-12 months in case if a freezer or
cooler maintain temperature at 0° F (−18 °C) or less of it or
use an electric freezer to avoid cumbersome steps to make it.
Also make sure to fill the cooler with ice on the bottom and
then place meat and then cover with more ice. By ensuring
meat is surrounded by ice to ensure complete and uniform
freezing.
All the foods including meat begins to freeze at different
temperatures about –0.6°C (21.2°F) for certain kinds of fish
to –7°C (19.4°F) for fewer kinds of fruits depending upon
their cellular composition. The important factor is the rate at
which food is being frozen is the foremost aesthetic reasons.
If the food is slowly frozen, the ice crystal formed will be
larger, which leads to cause the rupture of cells and the
destruction of texture in meat, fish, vegetables, and fruits. To
overcome this problem, the method of quick-freezing has
been developed, in which a food is cooled below its freezing
point as quickly as possible. The final product obtained
tends to have a firm, and natural texture than the method of
slow frozen technology when it is thawed. It is important to
maintain at temperature at or below -12°C in case of the
product needs to have good shelf life without losing its
flavour. This technology may change the texture of most of
the fruits and vegetables but meats and fishes are doing well
for this technology [14].
Thawing of meat and meat products is very important to
reduce the chance of food-borne illness and it can be done at
the refrigerator. Therefore items such as turkey meats should
be thawed it by submerging the meat in an air tight
packaging by changing of cold water every 30 minutes until
it gets thawed completely [15].
b) Chilling
Chilling can retard the multiplication and metabolic
activities of pathogenic bacteria, viruses and toxins in food
stuffs unlike higher temperature. Certain parasites such as
Taenia cysts (beef) and all stages of Trichinella spiralis,
might be completely destroyed by storing of infected food at
18ºC for periods of 20 to 30 days and it does by the rate of
cold penetration. Chilling is normally being done at
Paper ID: SR20326194523
DOI: 10.21275/SR20326194523
1500
International Journal of Science and Research (IJSR)
ISSN: 2319-7064
ResearchGate Impact Factor (2018): 0.28 | SJIF (2019): 7.583
Volume 9 Issue 3, March 2020
www.ijsr.net
Licensed Under Creative Commons Attribution CC BY
temperature from 0ºC to +8ºC for preservation of a wide
variety of food products including meat [16].
c) Freeze-drying
FD is a technology which is using the physical principle
called as sublimation, which is a process by which a solid
passes directly to the gaseous phase without melting the ice
formed. It is a best way of preserving food at low
temperatures from –10°C to –25°C and the in which the
chemical reactions will be at very slow phase and the
microorganism finds difficult for its survival. In this method
of preservation, the food items will be frozen first and then
sublimes to leave the final moisture content of as low as
0.5%.
d) Preserving by adding Salt i.e. curing meat
Curing of meat has been an age old technique for
preservation of meat. With the advances in the modern
means of preservation curing has been used as an additional
step for its impact on the taste and texture of food. In poor
nations curing is still a means for viability of meat and its
downscale operations like production, transport and access
[17]. Curing is a general term that covers salting, sugaring
and smoking are all methods of curing foods used for all
types of food preservation. Salting is the addition of sodium
chloride to food and it preserves the meat by absorbing
water and delaying the growth of microbes. In this manner,
salt, in combination with other measures, acts as a
preservative in many foods such as butter, cabbage, cheese,
cucumber, meat and fish. It also gives a desired flavour to
the food. Salting can be done by rubbing salt on meat or is
soaked in brine containing atleast 18% salt. The injection of
salt solutions into meat has also become popular [20].
Curing also involves preserving food items by combinations
of salt, nitrates, nitrites, or sugar, by drawing moisture out of
the food by the process of osmosis [18]. Concentrations of at
least 65%, sugar solution is widely used as a sweetening and
preserving agent. It has been found that microorganisms
rarely survive in solutions above 20–25% sugar
concentration. Dehydration was the earliest form of food
curing. By decreasing the water potential, it becomes
difficult for microbes to grow [19].
1.5 Nitrates and nitrites
Nitrates and nitrites are antimicrobial and give a pink or red
color to meat. Nitrite is obtained from sodium nitrite and
potassium nitrate. They in conjunction with salts aid in
preventing pathogens like Clostridium perfringens. Meats
from various resources by this treatment preserve the
properties, taste, texture, color and are also safe. Nitrates
application on meat is for a limited time while the formation
of Nitrite from Nitrates takes a longer time which further
forms nitric oxide (NO) [21]. No binds with the iron atom in
the myoglobin region which gives a reddish color when raw
and the ham pink color when cooked. The color in the meat
is due to the formation of nitrosomyoglobin and later due to
nitrosohemochrome. Maximum allowed nitrite concentration
in meat products is 200 ppm. The effect is seen for red or
processed meat, but not for white meat or fish [22].
1.6 Fermentation and pickling
Fermentation is a controlled microbial reaction. It results in
the production of acid and alcohol by the anaerobic or
partially anaerobic oxidation of carbohydrates. High
concentration of salt in pickling also acts as barrier for
pathogens and undesirable bacteria. The food material
results in the formation of an edible product. The
concentrations of the pickling agents and the time needed for
pickling are determined by the type of food [23, 24].
1.7 Irradiation
Irradiation is also known as “cold sterilization”. The
radiations affect the microbes by DNA damage and
ionization of water. Gamma radiations produce desired
effect only during food exposure and popularly used for
increasing the shelf life. UV radiations are mostly
bactericidal in nature and used for surface sterilization of
meat [7].
1.8 Hydrostatic pressure processing
High pressure directly affects cellular physiology of the
microorganisms and used as an additional final step during
processing without disturbing its native sensory attributes..
High pressure of a few hundred MPa reduces the survival of
bacterial cells, while a pressure of a few tens MPa can affect
its growth rate [7].
1.9 Hydrodynamic pressure processing
The concept of tenderizing meat using shock waves from
underwater detonation of explosives is called hydrodynamic
pressure processing. The shock wave creates pressure on
vacuum-packaged meat in the range of 70 MPa to 100 MPa
and reduces the microbes which may be present. The HDP-
The treated meat in this method shows no outward signs of
change, but on cooking, it was found to be significantly
tender than the control [7] [25].
2. Conclusion
Several advanced thermal and non-thermal methods like
super‐chilling, ultra rapid freezing, immersion vacuum
cooling, hydro fluidization freezing, impingement freezing,
electrostatic‐assisted freezing, pressure‐shift freezing, acidic
electrolyzed water coupled with high hydrostatic pressure,
and non-thermal plasma technique are utilized for preserving
meat quality and prolongation of shelf stability. Several of
these techniques are yet to be developed on an industrial
scale. Singly or in combination these techniques create a
hurdle for spoilage microorganisms and at the same time
increase the shelf life of meat.
Acknowledgement: The author would like to thank Dr.
Anil Dutt Semwal, Director, Defence Food Research
Laboratory for giving the necessary support.
Paper ID: SR20326194523
DOI: 10.21275/SR20326194523
1501
International Journal of Science and Research (IJSR)
ISSN: 2319-7064
ResearchGate Impact Factor (2018): 0.28 | SJIF (2019): 7.583
Volume 9 Issue 3, March 2020
www.ijsr.net
Licensed Under Creative Commons Attribution CC BY
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Paper ID: SR20326194523
DOI: 10.21275/SR20326194523
1502