What makes food shelf stable?

Food can be packaged in sterile and airtight containers. All foods eventually spoil if they are not preserved.

What makes food shelf stable?

Food can be packaged in sterile and airtight containers. All foods eventually spoil if they are not preserved.


food is heated to 121 °C for 3 minutes or its equivalent (botulinum cooking), which has a lethality similar to that of conventional canning. Zottola, in Encyclopedia of Food Sciences and Nutrition (second edition), 2003 Non-perishable foods have undergone preservation processes that have produced foods that are considered “commercially sterile”, that is,.

These foods are not completely sterile and are subject to some type of bacterial deterioration. For example, aciduric and thermoduric bacteria can spoil foods that have become stable by reducing the pH to less than 4.6 and applying a pasteurizing heat treatment. Certain Lactobacillus, Clostridium and Bacillus species are capable of surviving a thermal pasteurization process and, under the right conditions, will grow in foods with high acid content. It is generally recognized that high-acid foods are more susceptible to deterioration by yeasts and molds, but, as noted above, some bacteria grow and spoil even thermally processed acidic foods.

Canned food undergoes a severe heat process, which is primarily designed to destroy Clostridium botulinum spores. Other spore-forming bacteria, such as C. Sporogenes PA 3679 and Bacillus stearothermophilus will not be destroyed by a thermal process designed to control C. Botulinum toxin can subsequently grow in canned foods.

The deterioration of canned foods, known as “sour flat” deterioration, is caused by the proliferation of B. Stearothermophilus, which produces acid but no gas in canned foods. Other bacilli can also survive a minimal heat process and cause deterioration of canned foods. The failure of double stitching in canned foods causes what is called “deterioration due to leaks”.

These bacteria can cross the faulty double seam of cooling water, the dirty transport system, can deciphers, or other can-handling equipment. Thermally processed foods in glass containers will spoil in the same way if the closing mechanism used in the glass jar is faulty or not properly sealed. Food spoilage by bacteria can be prevented if food is properly processed and handled. The conservation processes used affect the likelihood and type of deterioration that will occur.

The greater the number of obstacles bacteria must overcome to grow, the longer it will take to deteriorate. Contamination with harmful bacteria can occur anywhere in the system that transfers food from the initial point of production to final consumption. Constant attention to the prevention of bacterial contamination of food at each of these process steps will ensure a continuous supply of safe and healthy food. Manufacturing non-perishable foods with long shelf life expectancies is a challenge and carries the risk of food poisoning if problems occur.

For this reason, the industry is very strict on all aspects of food safety throughout the manufacturing process, and packaging selection is part of that. The thermal processing to which products undergo is burdensome for packaging, and the correct materials and their handling must be chosen with detailed knowledge of the product, processing conditions, packaging restrictions, shelf life requirements, and storage and storage conditions. This chapter provides an overview of the requirements for choosing glass or plastic containers. Glass containers are strong, rigid and well established.

Requires specialized closures to form hermetic seals. The processing conditions must take into account the possibility of thermal shock and damage to the container. There are many different plastic packaging options, making this type of packaging attractive for marketing and product differentiation; but materials must be chosen taking into account barrier properties, processing conditions, product compatibility and processing conditions. This chapter attempts to list all the topics that need to be considered.

The two packaging options considered in this chapter have the advantage of being transparent and the product can be sold only to the consumer. It is thermally processable to allow the achievement of commercial sterility, has an integrity that prevents the entry of bacteria after thermal processing, provides a total barrier to oxygen to minimize degradation of the product inside, resists abuse of handling during distribution and retail sale, whether easy to open for the consumer and today's world, sensitive to the environment, is recyclable as a primary material. The metal can, whether made of steel or aluminum, performs all these functions well. However, environmental and economic factors continue to challenge can design engineers.

The food packaging market is driven by innovation, regardless of the material chosen. Can design continues to meet this challenge by progressively using smaller caliber materials to achieve the same performance of the can and the tip. This ensures that the key criteria of the package described above are not compromised. There's a point where innovative design can't move forward without the packaging machines logging in.

In recent years, it has become clear that the obstacles to the introduction of innovative metal packaging not only lie in the domain of the can manufacturer, but now also include obstacles in the cannery, which often focus on handling cans, but are also challenged by their own. sterilization systems. Large canning factories sterilize most of their production using large continuous cooking systems, such as hydrostats and coil and spiral pots. These cookers offer high efficiency, but their capabilities are limited.

The economy of scale also means that they are expensive to install and have a long lifespan, often 20 to 30 years. The can has changed significantly over the past 20 to 30 years; therefore, current can designs are expected to continue to work on equipment installed a generation ago. What influence can performance have? How can performance requirements be determined? A series of case stories will be used to illustrate the challenges faced by today's tin designers. Growing consumer demand for minimally processed and non-perishable foods has led food technologists and scientists to explore other methods of physical preservation as alternatives to traditional treatments, such as freezing, canning or drying.

While these traditional technologies have helped to ensure a high level of safety, heating and cooling food can contribute to the deterioration of several quality attributes, such as color, nutritional content and flavor (Delves-Broughton, 200. New and promising food and beverage preservation methods include the use of ultra-high pressure (UHP), pulsed electric fields (PEF), edible coatings and active packaging. Nisin, as a complement to these four new conservation methods, has been the subject of considerable research. For rectangular packages, several folds and folds are needed to form the required shape during manufacturing.

This sometimes creates opportunities for cracks and subsequent leaks in these types of packages. The non-rigid nature of paper-based materials makes them susceptible to punctures from impact with sharp objects. If this occurs after processing, packaging and storing the product on pallets, leaks in the packages at the top of the pallet could cause other packages to get wet on the bottom of the pallet and this could cause the entire pallet to collapse if the paper absorbs liquid and softens during the process. Sivaramakrishna et al., report on online differential quality control pressure testing of paper packages.

Electrolytic and dye tests could be the preferred statistically destructive tests for evaluating the quality of the seals on these packages. These tests are capable of indicating and identifying the location of package leaks, if any. In the case of composite cans and tubes, in which the cardboard material is bonded to the metal, care must be taken to limit the clamping pressure on the metal component. If the pressure is too high, the metal component could cut the cardboard and cause the package to leak (Weddig et al.

Mild temperature: long time (MTLT); and mild temperature: short time (MTST). HTST pasteurization is developed to ensure high product quality by minimizing the intensity of heat treatment. HTST treatment, heat treatments with temperatures above 80°C for a duration of less than 30 s, could reduce enzymes such as PME, PPO and POD in some juices. HTST treatment reported an increase in the total phenolic content, nutritional value, viscosity and color tone of some juices or nectars.

The pasteurization process with a combination of a temperature lower than 80°C and a duration greater than 30 s is called MTLT pasteurization. It is a process that is applied to improve minimally processed food products with a longer shelf life. MTST pasteurization with standards lower than 80°C and 30 s is a lighter process than other types of pasteurization processes. However, MTST treatment can affect the physicochemical, sensory and functional properties of juices (Petruzzi et al.

When comparing low temperature pasteurizations (65 °C for 30 or 60 s), longer pasteurization (60 s) reduced the natural microorganisms in pomegranate juice to a greater extent. The general objective of thermal processing is to produce safe and storage-stable food of the desired quality. To achieve this goal, various conservation methods have been used for centuries. Conventional thermal processing has a detrimental effect on the quality of processed food products.

This is why new non-thermal technologies are used, such as electrical pasteurization, high-pressure treatment and pulsed electric field technology, by applying very mild or no heat during processing. On the other hand, new thermal technologies allow processing to move from using intensive heat treatment for sterilization, pasteurization and cooking to the use of electromagnetic waves, such as RF, MW and alternating current (OH). In this regard, electroheating technologies, including RF, MW, and OH, are being widely explored as substitutes for conventional autoclave processing. Thanks to their volumetric heating capacity, these technologies allow exceptionally rapid heating at very high target temperatures, allowing short waiting times; therefore, MW and RF are novel technologies for heating food for sterilization, pasteurization, defrosting and drying purposes, providing rapid heating rates, more uniform heating and greater product safety and quality.

Despite their limitations for wide adaptation and application, MW and RF overcome the problems associated with the conventional high-temperature sterilization process, such as the formation of unpleasant flavors, the loss of colors and nutrients, and the dirt that often occurs in heat exchangers. Traditional tin steel was selected because of its high strength, malleability, conformability and the ability to improve the design of the can, particularly by welding. The blow forming method was used to shape many useful shapes of tinned steel cans (Kraus and Tarulis, 1997; Coles et al. Internal coatings, made of tin or soft plastics, ensure the prevention of corrosion and the maintenance of healthy food for long periods of time, often for several years (Arenas et al.

This technique is called passive packaging. Sometimes, the protective plastic layer on the steel is impregnated with antioxidants. Lee et al show lists of useful antioxidants. The Institute of Food Technologists has published a state-of-the-art summary of innovative food packaging solutions (Brody et al.

Other U.S. institutions are promoting the can industry and supporting the recycling of cans (Can Manufacturers Institute, 201. Shelf stable means that the full package can be stored for long periods of time under ambient conditions without refrigeration or freezing). Some liquids are naturally storage-stable and do not spoil, while others must be processed and filled by hot or aseptic filling to achieve the required sterility and be able to treat them as such. Paper-based materials used as packaging for stable food applications are used in composite materials.

Specialty food producers are often disappointed when they realize that they have to perform rigorous processing of their gourmet food product to make it stable in the market. Nowadays, people tend to consume not only safe and non-perishable foods, but also nutrient-rich and favourable-looking foods, while food processors demand high speed, minimal cost and energy loss through food processing techniques. It all comes down to this: pH, humidity and heat are the natural ways in which you can make your product storage-stable. These types of products are usually acidic and acidic and include fruit purees, juices and other pasteurized products with stable preservation.

Acidic or acidified: Acidified foods are products that use a combination of heat and acid to generate storage stability. Foods that are preserved by controlling water activity are more often “spoiled” by the action of enzymes than by direct bacterial growth in food. Keep in mind that a product can be kept stable in storage with increased water activity, but preservatives should be added (which are often not desired by artisanal food manufacturers with clean labels). Non-perishable foods have undergone preservation processes that have produced foods that are considered “commercially sterile” i.

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Eva Blomberg
Eva Blomberg

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