- There are three types of food spoilage namely:-Microbial spoilage; Physical spoilage; Chemical spoilage.
- Preservation of food is necessary so as to increase the self-life of foods thus increasing the supply. So many perishable foods can be preserved for a long time:- Making the seasonal food available throughout the year; Adding variety to the diet; Saving time by reducing preparation time and energy, as the food has already been partially processed ; Stabilizing prices of food, as there is less scope of shortage of supply to demand; Decreasing wastage of food by preventing decay or spoilage of food; Improving the nutrition of the population. Preserved foods help people to bring a variety in the diet, thereby decreasing nutritional inadequacies.
- Enzymes are important when preserving food because enzymes are not taken with food, the body will have to produce its own digestive enzymes. Thus the long term consumption of enzyme-deficient foods can exhaust the digestive organs and lead to various health problems, including chronic degenerative disease.
- Canning refers to the process of applying heat to food that’s sealed in a jar in order to destroy any microorganisms that can cause food spoilage. Proper canning techniques stop this spoilage by heating the food for a specific period of time and killing these unwanted microorganisms. During the canning process, air is driven from the jar and a vacuum is formed as the jar cools and seals.
Freezing foods refers to the art of making, packaging, and freezing foods products at their topmost freshness. Food can be frozen most fresh fruits and vegetables, fish and meat, cake and bread, and clear casseroles and soup.
Drying refers to a traditional means of preservation the oldest method known for preserving food. When you dry food, you expose the food to a temperature that’s high enough to remove the moisture but low enough that it doesn’t cook. Good air circulation assists in evenly drying the food.
- A) Salt inhibits the growth of spoilage-causing microorganisms by drawing water out of microbial cells through osmosis. As the unwanted bacterial population decreases, other beneficial bacteria, primarily of the Lactobacillus genus, come to the fore and generate an acidic environment (around 4.5 pH). The sugar included in the cure is used as food by the lactobacilli; generally dextrose is preferred over sucrose, or table sugar, because it seems to be more thoroughly consumed by the bacteria. This process is in fact a form of fermentation, and, in addition to reducing further the ability of the spoilage bacteria to grow, accounts for the tangy flavor of some cured products. Concentrations of salt up to 20% are required to kill most species of unwanted bacteria.
- b) Today, however, it is preferred to use a hydrometer or to carefully mix measured ingredients from a reliable recipe. Once mixed and placed into a suitable container, the food is submerged in the salt brine. Brine curing usually produces an end product that is less salty compared to dry curing. Injection of brine into the meat can also speed the curing process.
- In pickle preparation, its’ necessary to acidify the food to a pH of 4.6 or lower so it can safely be canned in a water bath. Food can be acidified in a number of ways, including a curing process (fermentation) or the addition of vinegar (quick pickling). Usually, when people refer to pickles, they mean a product made with the former method. Also known as quick-process or fresh-pack pickling, this is the method of covering the vegetables or fruits in seasonings, spices and hot vinegar. While quick pickling will preserve the food and allow you to can it for long-term storage, it does not offer the probiotic benefits of fermentation.
Fermentation of fruits or vegetables is cured in salt-and-water brine for one week or longer, altering its flavor, texture and color—no vinegar is added of vinegar is neither necessary nor required. As a substitute, the brine reacts with natural bacteria already present on the food to produce lactic acid, which helps preserve the product but is also a natural probiotic that aids in digestion.
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