Complex profiles of azaspiracid analogues in two culture strains of Azadinium poporum (Amphidomataceae, Dinophyceae) isolated from Japanese coastal waters determined by LC-MS/MS. (August 2021)

• Record Type: Journal Article
• Authors: Ozawa, Mayu; Uchida, Hajime; Watanabe, Ryuichi; Matsushima, Ryoji; Oikawa, Hiroshi; Takahashi, Kazuya; Iwataki, Mitsunori; Suzuki, Toshiyuki
• Is Part Of: Toxicon. Volume 199(2021)
• Page Start: 145
• Page End: 155
• Publication Date: 2021-08
• Subjects: Azadinium poporum -- Azaspiracids -- LC-MS/MS -- High resolution MS; AZA azaspiracid -- LC-MS/MS liquid chromatography-tandem mass spectrometry -- SRM selected reaction monitoring -- LC-QTOFMS liquid chromatography-quadrupole time of flight mass spectrometry; Toxins -- Periodicals; Venom -- Periodicals; 615.9
• DOI: 10.1016/j.toxicon.2021.06.010
• Languages: English
• ISSNs: 0041-0101

Abstract

Abstract: Lipophilic marine biotoxins azaspiracids (AZAs) are produced by dinoflagellates Azadinium and Amphidoma . Recently, several strains of Azadinium poporum were isolated from Japanese coastal waters. In our present study, AZA analogues in two strains (mdd421 and HM536) of A. poporum were analyzed by several detection techniques on the liquid chromatography-tandem mass spectrometry (LC-MS/MS) and liquid chromatography-quadrupole time of flight mass spectrometry (LC-QTOFMS). The dominant AZA analogue in the Japanese A. poporum strains was AZA2. Other known AZA analogues were AZA11, AZA35, AZA2 methyl ester and AZA2 phosphate ester. Besides these AZAs, thirteen new AZA analogues were discovered in the two strains. A putative AZA analogue (Compound 1) with the smallest molecular weight ever found in nature was also discovered in the two strains. This is the first report describing detailed AZA profiles in Japanese isolates of A. poporum . Highlights: Azadinium poporum isolated from Japanese coastal waters produced azaspiracid-2 along with other minor analogues. Thirteen new azaspiracid analogues were discovered in Japanese Azadinium poporum strains. Toxin profiles of azaspiracids in Japanese Azadinium poporum strains were considerably complex.