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Occurrence of marine algal toxins in oyster and phytoplankton samples in Daya Bay, South China Sea

文献类型： 外文期刊

作者： Jiang, Tao 1 ; Liu, Lei 2 ; Li, Yang 4 ; Zhang, Jing 2 ; Tan, Zhijun 1 ; Wu, Haiyan 1 ; Jiang, Tianjiu 2 ; Lu, Songhui 2 ;

作者机构： 1.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Minist Agr, Key Lab Sustainable Dev Marine Fisheries, Qingdao 266071, Peoples R China

2.Jinan Univ, Res Ctr Harmful Algae & Marine Biol, Guangzhou 510632, Guangdong, Peoples R China

3.Natl Marine Environm Monitoring Ctr, Dalian 116023, Peoples R China

4.South China Normal Univ, Coll Life Sci, Guangzho

关键词： Shellfish toxins;Okadaic acid;Pectenotoxin;Dinophysis;Domoic acid;Pseudo-nitzschia

期刊名称：CHEMOSPHERE （ 影响因子：7.086； 五年影响因子：6.956 ）

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收录情况： SCI

摘要： The occurrence and seasonal variations of marine algal toxins in phytoplankton and oyster samples in Daya Bay (DYB), South China Sea were investigated. Two Dinophysis species, namely, D. caudata and D. acuminata complex, were identified as Okadaic acid (OA)/pectenotoxin (PTX) related species. Liquid chromatography with tandem mass spectrometry (LC-MS/MS) analysis demonstrated that 2.04-14.47 pg PTX2 per cell was the predominant toxin in single-cell isolates of D. caudata. D. acuminata was not subjected to toxin analysis. The occurrence of OAs in phytoplankton concentrates of net-haul sample coincided with the presence of D. accuminata complex, suggesting that this species is most likely an OA producer in this sea area. OA, dinophysistoxins-1 (DTX1), PTX2, PTX2sa, gymnodimine (GYM), homo-yessotoxin (homoYTX), and domoic acid (DA) demonstrated positive results in net haul samples. To our best knowledge, this paper is the first to report the detection of GYM, DA, and homoYTX in phytoplankton samples in Chinese coastal waters. Among the algal toxins, GYM demonstrated the highest frequency of positive detections in phytoplankton concentrates (13/17). Five compounds of algal toxins, including OA, DTX1, PTX2, PTX2sa, and GYM, were detected in oyster samples. DA and homoYTX were not detected in oysters despite of positive detections for both in the phytoplankton concentrates. However, neither the presence nor absence of DA in oysters can be determined because extraction conditions with 100% methanol used to isolate toxins from oysters (recommended by the EU-Harmonised Standard Operating Procedure, 2015) would likely be unsuitable for this water-soluble toxin. In addition, transformation of DA during the digestion process of oysters may also be involved in the negative detections of this toxin. GYM exhibited the highest frequency of positive results in oysters (14/17). OAs were only detected in the hydrolyzed oyster samples. The detection rates of PTX and PTX2sa in oysters were lower than those in the net haul samples. (C) 2017 Elsevier Ltd. All rights reserved.

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[1]Pseudo-nitzschia simulans sp nov (Bacillariophyceae), the first domoic acid producer from Chinese waters. Li, Yang,Huang, Chun Xiu,Xu, Guo Shuang,Li, Yang,Huang, Chun Xiu,Xu, Guo Shuang,Lundholm, Nina,Teng, Sing Tung,Wu, Haiyan,Tan, Zhijun.

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