title: [Determination of the base contents of liver DNA of rats by reversed-phase high performance liquid chromatography].
abstract: The base contents of liver deoxyribonucleic acid (DNA) of rats living at an altitude of 2.3 km were determined by reversed-phase high performance liquid chromatography. At first, 0.05 mol/L KH2PO4(pH 4.0) was used to dissolve the DNA acid hydrolysis products with 8-bromoguanosine (Br8G) as an internal standard. Then the DNA hydrolysis products with Br8G were chromatographed on a Supelcosil LC-18 column with UV detection at 254 nm and eluted by the mobile phase of MeOH-0.05 mol/L KH2PO4(pH 4.0) (20:80, V/V) at the flow rate of 0.8 mL/min. Under these conditions, several bases were separated effectively. From the results, the relatively constant proportions of the bases in DNA were found. The contents were 17.4% of cytosine (C), 28.8% of adenine (A), 23.3% of guanine (G) and 25.3% of thymine (T). RSDs of the determination of these bases were 1.7%, 1.5%, 1.3% and 2.1%, respectively. At the same time the methylation level of liver DNA of the rats determined by the internal standard method was 6.2%.
authors.affiliation: Northwest Plateau Institute of Biology, Chinese Academy of Sciences, Xining 810001, China. ytwey@163.com
authors.forename: Chao-yun
authors.initials: CY
authors.lastname: Wang
authors.forename: Feng-zu
authors.initials: FZ
authors.lastname: Hu
authors.forename: Zhi-xian
authors.initials: ZX
authors.lastname: Shi
mesh_terms: D000225:Adenine / Q000032:analysis; D000531:Altitude; D000818:Animals; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D003596:Cytosine / Q000032:analysis; D004247:DNA / Q000737:chemistry*; D019175:DNA Methylation; D006147:Guanine / Q000032:analysis; D008099:Liver / Q000737:chemistry*; D051381:Rats; D013941:Thymine / Q000032:analysis
chemical_list: D006147:Guanine; D003596:Cytosine; D004247:DNA; D000225:Adenine; D013941:Thymine