title: New values of molecular extinction coefficient and specific rotation for cyanobacterial toxin cylindrospermopsin.
abstract: The molecular extinction coefficient epsilon of cylindrospermopsin (CYN) purified by the anion exchange and the normal-phase HPLC procedures was determined to be 9800 at 262 nm. This epsilon is significantly higher than those (epsilon, 5800-6250) reported previously. In order to determine CYN concentrations in solutions using UV absorption, the epsilon-value of CYN should be corrected from 5800 to 9800. Further, the [alpha](D) value of CYN should be corrected from +12.5 degrees to +17.0 degrees .
authors.affiliation: National Institute for Environmental Studies, Onogawa 16-2, Tsukuba, Ibaraki 305-8506, Japan.
authors.forename: Tomoharu
authors.initials: T
authors.lastname: Sano
authors.forename: Sachiko
authors.initials: S
authors.lastname: Kikuchi
authors.forename: Takuya
authors.initials: T
authors.lastname: Kubo
authors.forename: Hiroo
authors.initials: H
authors.lastname: Takagi
authors.forename: Ken
authors.initials: K
authors.lastname: Hosoya
authors.forename: Kunimitsu
authors.initials: K
authors.lastname: Kaya
mesh_terms: D000470:Alkaloids; D000818:Animals; D001427:Bacterial Toxins; D000458:Cyanobacteria / Q000378:metabolism*; D000087522:Cyanobacteria Toxins; D015394:Molecular Structure; D014498:Uracil / Q000031:analogs & derivatives* / Q000737:chemistry / Q000378:metabolism
chemical_list: D000470:Alkaloids; D001427:Bacterial Toxins; D000087522:Cyanobacteria Toxins; C089595:cylindrospermopsin; D014498:Uracil