Agar is a kind of seaweed glue. Agar, also known as seaweed, is the most commonly used curing agent for microbial culture medium. It is also used in canned meat, fish, poultry, cosmetics, drugs and dental medicine. Agar is a polysaccharide extracted from seaweed. It is one of the most widely used seaweed gels in the world.
Agar has coagulability and stability, and can form complexes with some substances. It can be used as thickener, coagulant, suspending agent, emulsifier, preservative and stabilizer.
It is widely used in manufacturing granular orange and various beverages, jelly, ice cream, pastries, soft candy, cans, meat products, Babao porridge, tremella bird's nest, soup food, cold food and so on. Agar can be used as culture medium, ointment medium and other purposes in chemical industry and medical scientific research.
The most useful property of agar is that the temperature difference between its freezing point and melting point is very large. It needs to be heated to 95 ℃ in water before melting, and the molten solution temperature needs to be reduced to 40 ℃ before solidification, so it is the best coagulant for preparing solid culture medium.