(i need a page long answerplz) why kan bread without preservatives grow mold faster than bread with pres.?

Answer 1

Food preservation is the process of treating and handling food in such a way as to stop or greatly slow down spoilage to prevent foodborne illness while maintaining nutritional value, density, texture and flavor.

Preservation usually involves preventing the growth of bacteria, fungi and other micro-organisms, as well as retarding the oxidation of fats which cause rancidity. It also includes processes to inhibit natural aging and discolouration that can occur during food preparation such as the polyphenoloxidase reaction in apples which causes browning when apples are cut. Some preservation methods require the food to be sealed after treatment to prevent re-contamination with microbes; others, such as drying, allow food to be stored without any special containment for long periods.

A preservative is a natural or synthetic chemical that is added to products such as foods, pharmaceuticals, paints, biological samples, etc. to retard spoilage, whether from microbial growth or undesirable chemical changes.

Preservatives may be added to wood to prevent the growth of fungi as well as to repel insects and termites. Typically copper, borate, and petroleum based chemical compounds are used. For more information on wood preservatives see timber treatment, lumber and creosote.

Preservatives in food

Preservative food additives can be used alone or in conjunction with other methods of food preservation.

A distinction is sometimes made between anti-microbial preservatives which function by inhibiting the growth of bacteria and fungi, and antioxidants such as oxygen absorbers, which inhibit the oxidation of food constituents.

Common anti-microbial preservatives include [calcium propionate],sodium nitrate, sodium nitrite, sulphites (sulfur dioxide, sodium bisulfite, potassium hydrogen sulfite, etc.) and disodium EDTA. Antioxidants include BHA and BHT. Other preservatives include formaldehyde (usually in solution), glutaraldehyde, diatomaceous earth (kills insects), ethanol, dimethyl dicarbonate and methylchloroisothiazolinone. The benefits and safety of many artificial food additives (including preservatives) are the subject of debate among academics and regulators specializing in food science and toxicology.

Foods such as salt, sugar or vinegar are also used as preservatives.

Retrieved from "http://en.wikipedia.org/wiki/Preservative"

Answer 2

Because preservatives are there to preserve the bread. That means keeping mold from growing on it. You've taken the class (I hope you attended and read the assignments), so you can fill that out to a page yourself with the details you've learned in class.

Answer 3

then you need to read at least a page long report on bread, mold, preservatives. Try the web search feature at the top of the page.

Answer 4

to make mold grow the fastest you take normal bread and put water on it(not alot but enough) then put it in a plastic sandwitch bag and close it and wait a couple days like 2 days then open it and put it close to a heater and leave it for about two days and you should get some good mold pretty fast

Answer 5

the word PRESERVATIVES says it all...PERSERVE means save so the preservatives help to save the bread longer

Answer 6

Why are you asking us to do your homework for you?