Only use these food additives in canned, it can sale a long time.
improve quality
Canned food replaces some of its' nutrition with preservatives which are slightly toxic, (in other words, processed food takes away the good and replaces it with the bad) to stay "fresh" longer. Real fresh food is far healthier than canned food is simply because it does not contain these semi-toxic preservatives.
If your dry dog food doesn't have a 'sell by' date then it is packed with preservatives. (NOT GOOD!) I'm not sure about canned food, but I know that it usually lasts for awhile.
Acids are added in foods for taste and as preservatives.
Almost all canned and jar foods contain preservatives. Preservatives help lengthen the shelf-life of foods.
Food preservatives are substances 'that are added to food items in order to inhibit, retard or arrest the process of fermentation, acidification, and decomposition of food items'. Or, in other words, preservatives in food help keep the food safe, without spoiling, for longer.
to help keep the food for longer This will help them keep longer
When food is packaged in cans, air is sucked out of the can to help prevent the food inside from spoiling. Some manufacturers add preservatives to food to help keep it fresh longer.
Preservatives preserve food to keep from spoiling such as aspartame is a popular preservative You answered your own question. The root word of preservatives is preserve. If you look up the definition of preserve, then you have your answer. I recommend brushing up on your vocabulary as it can be very beneficial to you in many ways.
These are additives as preservatives, colouring agents, emulsifiers, acidifiers, vitamins etc.
You can buy natural food preservatives from Global Natural Food Preservatives Suppliers. You can type in food additives in the internet and it will bring up suppliers of chemical preservatives. Think carefully before adding preservatives to any food.
They will spoil. There are no preservatives in home canned preserves.
Preservatives stop food from going of, they preserve its useful life.