title: Determination of a pyranocoumarin and three carbazole compounds in Clausena excavata by RP-HPLC.
abstract: Clausenidin, O-methylmukonal, 3-formyl-2,7-dimethoxycarbazole, and clauszoline-J, isolated from the rhizomes and roots of Clausena excavata, exhibit anti-HIV-1 activity in a syncytial assay with EC(50) values of 5.3, 12.0, 29.1, and 34.2 microM, respectively. Due to the highly active anti-HIV-1 property, quantitative analysis of four compounds are investigated. The direct analysis of these four compounds in the crude extracts of the combined rhizomes and roots of Clausena excavata from ten various sources in Thailand by high-performance liquid chromatography is accomplished. Chromatographic separation is achieved on a C(18) column, and the mobile phase is a mixture of methanol and distilled water in a mode of isocratic or gradient elution detected at 254 nm at a flow rate of 0.6 mL/min for clausenidin, at 274 nm at a flow rate of 0.6 mL/min for O-methylmukonal, at 298 nm at a flow rate of 0.4 mL/min for 3-formyl-2,7-dimethoxycarbazole, and at 242 nm at a flow rate of 0.4 mL/min for clauszoline-J. This is the first quantitative analysis of these four anti-HIV-1 compounds from the crude extract without prior isolation and purification steps.
authors.affiliation: Natural Products and Organic Synthesis Research Unit (NPOS), Department of Chemistry and Center for Innovation in Chemistry, Faculty of Science, Kasetsart University, Bangkok 10903, Thailand. fscinpk@ku.ac.th
authors.forename: Boonsong
authors.initials: B
authors.lastname: Kongkathip
authors.forename: Suriyan
authors.initials: S
authors.lastname: Sutthiprabha
authors.forename: Chalobon
authors.initials: C
authors.lastname: Yoosook
authors.forename: Yupa
authors.initials: Y
authors.lastname: Mongkolsook
authors.forename: Ngampong
authors.initials: N
authors.lastname: Kongkathip
mesh_terms: D002227:Carbazoles / Q000032:analysis* / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D056148:Chromatography, Reverse-Phase / Q000379:methods*; D054700:Clausena / Q000737:chemistry*; D016014:Linear Models; D000432:Methanol; D010936:Plant Extracts / Q000737:chemistry; D018517:Plant Roots / Q000737:chemistry; D039681:Pyranocoumarins / Q000032:analysis* / Q000737:chemistry
chemical_list: D002227:Carbazoles; D010936:Plant Extracts; D039681:Pyranocoumarins; D000432:Methanol