AA and ARA are the same thing, eicosastetraenoic acid. The main differences from DHA are as follows:

1. Different ways of existence

1 , DHA: It is found in various fish oils, especially in the fat of deep-sea fish.

2. ARA: The carbon four fractions are separated by extractive distillation. It can also be obtained by absorption method, molecular sieve method, complexation method, etc.

2. Different characteristics

1. DHA: Pure DHA is colorless and odorless, liquid at room temperature, fat-soluble, easily soluble in organic solvents, and insoluble in water. .

2. ARA: It has the effects of stimulating the uterus, prolonging the gestation period of rats and inhibiting the secretion of gastric acid. Exogenous arachidonic acid has a contractile effect on rabbit aorta, so it is speculated that it may be endothelium-dependent contraction factor (EDGF).

3. Different melting points

1. DHA: melting point is -45.5~-44.1℃.

2. ARA: melting point -49.5℃.

Baidu Encyclopedia-DHA

Baidu Encyclopedia-ARA (eicosatetraenoic acid)