Purine bases

Purine bases - derivatives Purina, contained in all cells and organisms which are the important components of nucleic acids and nucleotides.
In the structure of nucleic acids (see) and nucleotides (see) are mainly adenine (6-aminopurine) and guanine (2-amino-6-oksipurin). In very small amounts of nucleic acids allocated methylated derivatives adenine and guanine (methyladenine, dimethylamine, methyl - and demetilxantin and others). In the process of metabolism in the body adenine and guanine are oxidized respectively in gipoksantin (6-oxoborn) and xanthine (2,6-dioxopurine). The end product of metabolism purine bases in humans and apes is uric acid (see), which is 2, 6, 8-trioxypurine. Most mammals uric acid is oxidized to a soluble product of allantoin, in the form of which is excreted from the body. In small quantities in the urine, feces, and in tissues and body fluids meet and available purine bases.
Purine bases containing an amino group (aminopurine)are weak bases. Oxipurinol (gipoksantin, xanthine, uric acid) is dominated by the acid properties. P. O. poorly soluble in water. They are characterized by strong absorption of ultraviolet rays in the wavelength of about 260 MMK. Determination of the absorption spectrum in the ultraviolet rays is the main method of identification and P. O.