why certain food such as pickle are preserved?what cause food to rot?certain food items such as nuts do not rot if kept at a room temperature while other items such as dough need refrigeration for preservation.why?
Answers
Answer:
Pickles are foods preserved in a solution, most commonly pickles are either preserved in vinegar, a brine (salt solution) or alcohol that encourages the growth of certain bacteria that aren’t harmful and also prevent the bacteria that will spoil the food otherwise.
Pickled in Vinegar
Vinegar is an acid, most pickling solutions are between 5 – 10% acidity. When foods are placed in this acidic environment the very low pH prevents organisms from being able to survive. The vinegar is often flavoured and seeps into the food changing the texture and flavour.
Fermented Pickles
Pickling
An example of a fermented pickle is Sauerkraut which is a fermented cabbage. It is made by encouraging lactic acid bacteria, which is present on the cabbage leaves, to multiply and ferment the cabbage leaves.
Cabbage leaves are shredded and layered with salt, the salt concentration draws water out of the cabbage and encourages lactic acid bacteria. This is left to ferment for around 4 weeks. The lactic acid created during fermentation is acidic enough to create an inhospitable environment to any potential bacteria or yeasts that will spoil the cabbage.
The principles at work here are the same for other fermented pickles such as kimchi and gherkins.
Explanation:
rotting is a natural process that all foods eventually go through if left exposed to the elements, you definitely don't want to eat food that you suspect is spoiled. To the contrary, you should dispose of any food you believe may be rotten, so that you avoid the possibility of food-borne illnesses.
When food is harvested, either in the form of vegetables, fruits, or meats (from animals), it becomes detached from the sources that gave it life. In other words, once you pick an apple, it begins to die immediately.
Some foods, such as fruits and vegetables, have thick cell walls that keep the food in an edible state for several days or even weeks. Over time, though, those cell walls begin to break down. When this happens, you can feel these fruits and vegetables become less solid. They may also begin to turn colors, smell bad, and taste even worse!
What causes these changes within foods? Some of the primary culprits are air, moisture, light, temperature, and microbial growth. When two or more of these culprits get together, they can accelerate the spoiling process even further.
When food is exposed to air, microorganisms can land on the food and begin their work of breaking down the food for their own uses. The presence of oxygen enhances the growth of microorganisms, such as molds and yeasts, and contributes directly to deterioration of fats, vitamins, flavors, and colors within foods through the work of enzymes.
All food is made up of a certain percentage of water. Over time, microorganisms use the water within food to fuel the chemical reactions they need to dissolve the food for energy and growth. Moisture on the outside of food also allows molds and other microorganisms to grow on the outside of food, as well as within any cracks or holes in the surface of the food, further contributing to increased decay.
When food is exposed to light, its outer layers can begin to spoil in a process known as photodegradation. Photodegradation can result in discoloration, as well as loss of flavor, vitamins, and proteins.
Temperature also plays a role in food spoilage. As temperature increases, the chemical reactions that drive the spoiling process accelerate. That's why putting foods in the refrigerator or freezer helps to slow down the rotting process.
The process of food spoilage isn't all bad, though. It's a natural process that allows nutrients from the foods, as well as seeds, to be released and used again by living organisms in the environment. These processes are also key to creating some of the foods you love. While no one wants to drink spoiled milk, the souring of milk is an important step in the process of making cheese!
Since most of us do not grow our own food today, we must take steps to prevent food spoilage, so that food will last long enough for it to be transported to a store where we can buy it and bring it home to cook and eat. Scientists and researchers have helped develop many tactics over the years to fight against the main causes of spoilage, such as air, chemical reactions, and microorganisms.
If you've been to a grocery store recently, you know that food comes in a wide variety of packaging. That's not all just for show. Food packaging helps to protect it from the air and light. Controlling temperature by refrigerating and freezing foods also helps to slow down chemical reactions. Finally, the battle against microorganisms is often fought by adding chemicals known as preservatives to food. These chemicals help to inhibit the chemical reactions that allow microorganisms to break down food for energy
Answer:
why certain food such as pickle are preserved?
Explanation:
why certain food such as pickle are preserved?