this link is useful

http://www.fao.org/docrep/V5030E/V5030E0d.htm

regards

Yes Hassan Nima, there is a big list of traditional and modern preservatives. But health related informations are not given.

Hi

you can see my article I hope its useful

Data Effect of chitosan on apple juice quality

Preservatives

Preservatives keep food from spoiling and maintain freshness and color or flavor foods. They are often added to baked goods, meats, jellies and beverages. Preservatives include ascorbic acid, citric acid, sodium benzoate, calcium propionate, vitamin E, BHA and BHT. Calcium propionate is a chemical preservative used in cheeses, and citric acid is used as a buffer and neutrilizer in dressings, cheeses and canned fruit juices. BHA (butylated hydroxytoluene) and BHA (butylated hydroxyanisole) are antioxidants commonly used in breakfast cereals to help prevent change in color, odor or flavor.

Additives

According to the Food and Drug Administration, a food additive is any substance added to food, including preservatives, food coloring, flavor enhancers, thickeners, stabilizers, nutrients and sweeteners. Examples of food additives are sucrose (sugar), glucose, fructose, sorbitol, mannitol, corn syrup, high fructose corn syrup, saccharin and aspartame, used for sweetening; or FD&C Yellow Nos. 5 and 6, annato or beta carotene, used for food coloring. Thickeners and stablizers include pectin, guar gum, carrageenan, xanthan gum, whey and gelatin. Breads and baked goods often contain leavening agents such as baking soda, monocalcium phosphate and calcium carbonate.

Preservation of products containing chemical food preservatives is usually based on the combined or synergistic activity of several additives, intrinsic product parameters (e.g. composition, acidity, water activity) and extrinsic factors (e.g. processing temperature, storage atmosphere and temperature). Pleas try to get more information in the following useful links.

http://www.fao.org/docrep/V5030E/V5030E0d.htm

https://www.fda.gov/Food/IngredientsPackagingLabeling/FoodAdditivesIngredients/ucm094211.htm

https://scialert.net/fulltextmobile/?doi=ajft.2011.914.923https://cen.acs.org/articles/92/i6/Extending-Shelf-Life-Natural-Preservatives.html

Benzoic acid in the form of its sodium salt, constitutes one of the most common chemical food preservative. Sodium benzoate is a common preservative in acid or acidified foods such as fruit juices, syrups, jams and jellies, sauerkraut, pickles, preserves, fruit cocktails, etc.

Agree with Ali Alhayany

regards

I have no idea. Sorry, Amir

Sodium benzoate inhibits the growth of bacteria, mold and yeast in acidic conditions. The preservative is commonly used in carbonated beverages, fruit juices, pickles, salsa and dip. According to Don Schaffner, a professor of food science at Rutgers University in New Jersey, sodium benzoate poses no health dangers when consumed in minimal amounts, and the concentrations used in food are low enough that they pose no risk.

https://www.livestrong.com/article/288335-the-most-common-food-preservatives/

Effect of Chemical Additives on the Shelf Life of Tomato Juice

• https://scialert.net/fulltextmobile/?doi=ajft.2011.914.923

Hi,

Preservation is basically done for three reasons:

To preserve the natural characteristics of food. To preserve the appearance of food

To increase the shelf value of food for storage.

1-Natural Food Preservatives

In the category of natural food preservatives comes the salt, sugar, alcohol, vinegar etc. These are the traditional preservatives in food that are also used at home while making pickles, jams and juices etc. Also the freezing, boiling, smoking, salting are considered to be the natural ways of preserving food. Coffee powder and soup are dehydrated and freeze-dried for preservation. In this section the citrus food preservatives like citrus acid and ascorbic acid work on enzymes and disrupt their metabolism leading to the preservation.

Sugar and salt are the earliest natural food preservatives that very efficiently drops the growth of bacteria in food. To preserve meat and fish, salt is still used as a natural food preservative.

2-Chemical Food Preservative

Chemical food preservatives are also being used for quite some time now. They seem to be the best and the most effective for a longer shelf life and are generally fool proof for the preservation purpose. Examples of chemical food preservatives are:

Benzoates (such as sodium benzoate, benzoic acid). Nitrites (such as sodium nitrite). Sulphites (such as sulphur dioxide)

Sorbates (such as sodium sorbate, potassium sorbate

Hi,

Please see attachment, it is containing a good information about your question.

Yes Khulood Obaid, I can't see any attachment. I think you forgot to attach a link or file.

Regards

Interesting discussion.

Preservatives such as sodium benzoates, potassium sorbate etc. are added to colored juices and potassium metabisulphite to light colored juices as it bleaches their color during storage.

Interesting question

Following the answers.

All preservatives and additives are not good for health. We must know about these chemicals and should avoid the toxic one.

For example, three food colors, Yellow 5, Yellow 6 and Red 40—contain compounds, including benzidine and 4-aminobiphenyl, that research has linked with cancer.

Dear Dr.Mohammad,

A number of preservatives, such as citric acid, ascorbic acid, sodium benzoate, vinegar, salt, calcium propionate ,sodium sorbate, potassium sorbate, benzoic acid etc. are used in various foods and beverages in order to prevent spoilage and also to increase the shelf value of food during storage. Sodium benzoate is commonly employed as a preservative as it inhibits the growth of bacteria as well as fungi. At home, we are mostly using vinegar as it gives good results.I strongly believe that no preservative should be added in foods or drinks from health point of view.We should consume the food or drink in its natural form without any chemical.

I have uploaded papers on preservation on Research Gate.In case,you are interested, you may please download.

With best wishes,

Prof.Dr.Mahendra Pal

Ex-Professor of VPH (UNDP)

Canned juices do not require preservatives. For canning 12D concept is applied.

But u can add class I and II preservatives within permissible limits.