Capillary electrophoretic assay and purification of cylindrospermopsin, a cyanobacterial toxin from Aphanizomenon ovalisporum, by plant test (blue-green Sinapis test).
Toxic cyanobacteria are known to produce cyanotoxins, toxic secondary metabolites. In recent years the cylindrospermopsin (tricyclic guanidinyl hydroxymethyluracil)-producing organisms Aphanizomenon ovalisporum, Cylindrospermopsis raciborskii, and Umezakia natans have been inhabiting polluted fresh waters. Cylindrospermopsin, a potent hepatotoxic cyanotoxin, has been implicated in cases of human poisoning as well. This study describes the isolation and purification of cylindrospermopsin from A. ovalisporum with the help of a slightly modified Blue-Green Sinapis Test, a plant test suitable for determining the cyanotoxin content of chromatographic fractions besides plankton samples. The recent modification, using microtiter plates for the assay, improves the method and reduces the amount of sample needed for the assay. This approach proved that plant growth and metabolism, at least in the case of etiolated Sinapis alba seedlings, are inhibited by cylindrospermopsin. The establishment of capillary electrophoresis of cylindrospermopsin and consideration of the results reported here lead us to the expectation that capillary electrophoresis of cylindrospermopsin may be a powerful and useful analytical method for investigating cyanobacterial blooms for potential cylindrospermopsin content and toxicity. Confirmation of chemical identity of the purified compound is performed by UV spectrophotometry, NMR, and MALDI-TOF.
Vasas
Gábor
G
Department of Botany, University of Debrecen, Faculty of Science, H-4010, Debrecen, Hungary.
Gáspár
Attila
A
Surányi
Gyula
G
Batta
Gyula
G
Gyémánt
Gyöngyi
G
M-Hamvas
Márta
M
Máthé
Csaba
C
Grigorszky
István
I
Molnár
Erika
E
Borbély
George
G
D000470:Alkaloids; D001427:Bacterial Toxins; D000458:Cyanobacteria / Q000737:chemistry*; D000087522:Cyanobacteria Toxins; D019075:Electrophoresis, Capillary / Q000379:methods; D014498:Uracil / Q000031:analogs & derivatives* / Q000302:isolation & purification* / Q000506:poisoning; D014871:Water Microbiology; D018508:Water Purification
D000470:Alkaloids; D001427:Bacterial Toxins; D000087522:Cyanobacteria Toxins; C089595:cylindrospermopsin; D014498:Uracil