The number of atoms in the purine ring structure and which atoms are provided by glutamine are as follows.

The following are the number of atoms in the purine ring structure, and glutamine provides n? 、N？ Atoms.

Glutamine provides a third position (n? ) and 9 th place (n? ) nitrogen atom. The atom provided by glutamine is a nitrogen atom. Glutamine is an essential amino acid for human body. In the synthesis of purine nucleotides, glutamine provides nitrogen atoms.

In the purine ring structure, nitrogen atoms are mainly located at N-9 and N- 1 positions of the purine ring. Glutamine participates in the synthesis of purine nucleotides by providing these nitrogen atoms.

Glutamine is an amino acid and its English name is glutamine. It is a coded amino acid in protein synthesis and a non-essential amino acid in mammals. Glutamine can be used to treat gastric ulcer and duodenal ulcer, gastritis and hyperacidity, and can also be used to improve brain function.

Stored in a sealed and ventilated place, white crystal or crystalline powder, easily soluble in water, insoluble in methanol, ethanol, ether, benzene, acetone, chloroform and ethyl acetate, odorless and slightly sweet.

Glutamine is the main respiratory fuel for intestinal mucosal cells and various fast-growing cells such as lymphocytes and macrophages. At the same time, these cells use glutamine as the precursor of purine and pyrimidine synthesis.

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1. Take 5mL( 1 → 50) of this product aqueous solution, add 5ml of dilute hydrochloric acid and 1→50) sodium nitrite test solution, and foam.

2. Take 5ml( 1→ 1000) of this product aqueous solution, add 1mL ninhydrin test solution, and heat for 3min, and the solution will turn purple.

3. The infrared absorption spectrum of this product should be consistent with that of the reference substance (spectrum group 895).

4. Take a proper amount of this product and glutamine reference substance, dissolve them in water and dilute them to make a solution containing about 2.5mg per 1mL as the test solution and reference substance solution. According to the chromatographic conditions under related substances, the retention time of the main peak of the test solution should be the same as that of the reference solution.