Microbial spoilage

However, specifying the species and numbers of organisms representing an infection hazard is not straightforward. H2O2 production in meat has been associated with several types of lactic acid bacteria primarily Lactobacillus Handout - Meat Pigments The oxidant H2O2 reacts with nitrosohemochrome cured meat color cmpd to form a green porphyrin compound.

Spoilage of salt- and freshwater fish occurs in similar ways; the most susceptible part of the fish to spoilage is the gill region, and the best way to detect spoilage in fresh fish is Microbial spoilage sniff this area for off odors produced by Pseudomonas and Acinetobacter-Moraxella bacteria.

The rapid evolution in total genome sequencing offers new possibilities for fast and accurate identification and detection, when implemented in microarray technology. Yeasts and bacteria are the most common causes of spoilage, which is usually manifest in 3 ways: It is quite obvious that medicines should not contain pathogenic organisms that represent a source of infection.

Some lactobacilli when O2- impermeable films are used. Quite apart from representing an infection hazard, microorganisms may damage the medicine by degrading either the active ingredient or one or more excipients, thus compromising the quality and fitness for use of the product.

Off odors generally appear before sliminess develops. Bacteria on fresh fish are concentrated on the outer slime, gills and intestine. However, the genomic projects have mainly produced whole genome sequences of LAB associated with dairy or other fermentations, whereas the spoilage LAB have been less studied.

Reasons Cured meats bacon, hams are resistant Microbial spoilage spoilage: Degradation is usually due to either hydrolysis or oxidation, but decarboxylation, racemization and other reactions may also occur.

This information Microbial spoilage also facilitate the evaluation of the spoilage potential of strains that might be used as bioprotective cultures.


The FDA publishes details of product recalls on its website, and in March alone, there were three unrelated product recalls due to concerns about potential or confirmed microbial contamination.

Nitrite concentration in meat. A comprehensive study on Leuconostoc carnosum strains isolated from a meat processing plant revealed that only one pulsed field gel electrophoresis PFGE type of Microbial spoilage carnosum was associated with spoilage of cooked ham despite a tremendous diversity of strains of this species 25 different PFGE types detected in the plant and despite the fact that the spoilage strain was not overwhelmingly present in the production environment.

It should be emphasized that there is the possibility of an infection arising from the use of a product contaminated with a concentration of organisms that is too low to be detectable by sight or smell. Slimy spoilage Like other meat products, this occurs on the surface and is caused by the buildup of cells of yeasts, lactobacilli, enterococci or Brochothrix thermosphacta.

The numbers and variety of excipients that have been reported to be Microbial spoilage are at least as great as those of active ingredients. Microbial spoilage the s and s there were several reports in the pharmaceutical literature of infection occurring as a result of medicines containing pathogenic species, e.

During the initial stages of spoilage, the skin supports bacterial growth better than does the tissue which remains essentially free of bacteria for some time. For example, an organism may be present at a concentration that would be regarded as relatively harmless to a healthy individual but which may pose a problem for patients with impaired immunity.

Thus, the skin can sometimes be removed to salvage the food. Active ingredients known to be susceptible to microbial attack include steroids, alkaloids, analgesics and antibiotics. CO2 levels are higher 2. Because greening indicates more extensive product breakdown, I would not recommend eating green wieners.

Similarly, low numbers of Lactobacillus strains with beer-spoilage capacity can be identified among other LAB in beer by the use of appropriate specific primers.

For the wine-making industry, these methods are indispensable for the early and specific detection of ropy Pediococcus damnosus strains in wine, which may initially be present in small numbers among other non-spoilage pediococci. Shellfish are filter feeders and can be expected to contain almost any microorganism or virus that occurs in the water where they were obtained.

Off odors which result from: Common examples of product instability or deterioration include emulsion phase separation due to surfactant degradation, loss of viscosity due to microbial effects on gums, mucilages and cellulose derivatives employed as thickening agents, and alcohol and acid accumulation following fermentation of sugars.

Processed meats hot dogs, sausage and luncheon meats These products are composed of a variety of blended ingredients, any of which can contribute microorganisms to the food. The high fat content thus low aw of bacon Instead, spoilage of these products is often caused by molds from several genera including Aspergillus, Fusarium, Mucor, Penicillium, Rhizopus and Botrytis.

Spoilage of crustaceans shrimp, lobsters, crabs and crayfish is similar, but these products have some CHO 0. For instance, carnobacteria and enterococci were shown to dominate the spoilage association of cooked and brined shrimps.

The odors include ammonia, triethylamine, H2S and other compounds. However, it is not known how these LAB genera contribute to the spoilage of the product. Despite this knowledge on the dual nature of the behaviour of LAB in foods, more information is needed on their role in complex spoilage associations.

In the future, focus of research will be directed to the development and optimisation of rapid and reliable techniques for detection of LAB involved in spoilage with a special emphasis on methods applicable in routine laboratories and for the industry.

The decarboxylation of malic acid to lactic acid by Oenococcus oenos or other LAB is regarded beneficial to acid wines, but detrimental to low acid wines where it must be controlled to avoid spoilage, also associated with secondary fermentation after bottling. If these products were taken from clean waters, then the usual Pseudomonas and Acinetobacter-Moraxella types of spoilage bacteria dominate.

Molecular methods not requiring time-consuming culture and colony isolation steps are available for these purposes. In general, frozen fish products have lower counts than fresh products. Is the meat product raw or cooked?Food spoilage is caused by bacteria, yeasts, fungi, the food's own enzymes, insects, temperature fluctuation and oxidation.

When eaten, food that is spoiled by bacteria or other microbes presents a disease hazard to humans. Controlling heat, moisture and pH helps to inhibit spoilage by preventing.

The most important feature of microbial spoilage is that it is much easier to prevent the development of microorganisms in the wine than to remove the effects of spoilage once it has occurred.

Tag: winemaking. Spoilage follows contamination and describes the process and consequences of microbial growth in the product. Considering the potential for product spoilage and taking appropriate steps to minimize the risk of it occurring are very much the responsibility of the formulation scientist and the manufacturer.

Food spoilage may be caused by a variety of mechanisms, including microbial, chemical and physical reactions, and in many cases spoilage can be clearly defined in these distinct terms (Fig. ). Microbial spoilage is often due to the growth and/or metabolism of spoilage bacteria, yeasts or moulds.

Microbial contamination, spoilage and preservation of medicines

Yeasts and bacteria are the most common causes of spoilage, which is usually manifest in 3 ways: A. Slimy spoilage Like other meat products, this occurs on the surface and is caused by the buildup of cells of yeasts, lactobacilli, enterococci or.

Microbial spoilage results from bacteria, molds, and yeast. While microorganisms may or may not be harmful, the waste products they produce when growing on or in food may be unpleasant to taste. Pathogenic Spoilage.

Microbial spoilage
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