From ancient times, the salt and sugars are used as chemical preservatives. They are the regular part of our diet. The salt causes the food dehydration by drying out the water and tying up from the tissues of the food. It also ionizes yielding chlorine ion and interfere with the action of proteolytic enzymes which is harmful to the microorganisms. Similarly, sugar is also a part of our regular diet. It also produces the condition of high osmotic pressure that are unfavorable. Natural preservatives are the part of ancient method to save food from decaying. It delays the growth of unwanted substances like bacteria in the food for some time. They have different properties like antioxidative, antifungal, and antimicrobial which helps in the delay and prevention of the growth of unwanted substances [81–86].

1 1. Salt (Sodium Chloride, NaCl): It can be found in everyone’s kitchen. It is considered as one of the best natural preservative. It helps in the preservation of non-vegetarian food like meat, chicken, and some vegetables, too. Different unwanted substances sometimes breed on the food in the aqueous medium like bacteria and yeast, and they feed and degrade the food making it unfit to eat so salt helps to prevent this spoilage by the help of the process osmosis in which it dehydrates the microbes.