海洋沉积物可以保留许多环境污染物。亲脂性海洋植物毒素(LMPs)是海洋环境中普遍存在的天然有毒物质,它们在沉积物中存在的证据很少。在本研究中,为了探讨LMPs在沉积物中的发生和分布特征,在不同季节从大亚湾热带地区(DYB)收集的地表沉积物样本,使用液相色谱-串联质谱(LC-MS/MS)进行分析。根据结果,在来自DYB的沉积物样品中检测到多达六种毒素化合物,OA和DTX1的水平最高,其次是PTX2,Homo-YTX,AZA2和GYM。尽管在大部分沉积物中发现了AZA2和GYM,OA,DTX1,homo-YTX,PTX2是主要的毒素化合物,PTX2是沉积物中最普遍的毒素。沉积物中LMP组分的空间分布随采样次数而波动,部分根据沉积物的物理化学参数。地表沉积物中可能存在多种LMPs来源,但是很难确定沉积物中特定毒素来源的贡献。因此,海洋沉积物可能是通过食物链在底栖生物中积累LMPs的毒素储库。
Marine sediments can reserve many environmental pollutants. Lipophilic marine phycotoxins (LMPs) are natural toxic substances widespread in the marine environment; however, evidence of their existence in sediment is scarce. In the present study, in order to explore the occurrence and distribution characteristics of LMPs in sediment, surface sediment samples collected from a tropical area of Daya Bay (DYB) at different seasons, were analyzed using liquid chromatography with tandem mass spectrometry (LC-MS/MS). According to the results, up to six toxin compounds were detected in sediment samples from DYB, OA and DTX1 had the highest levels, followed by PTX2, homo-YTX, AZA2, and GYM. Although AZA2 and GYM were found in most of the sediment, OA, DTX1, homo-YTX, and PTX2 were the predominant toxin compounds, and PTX2 was the most ubiquitous toxin in sediment. The spatial distribution of LMP components in the sediment fluctuated with sampling times, partially according to the physical-chemical parameters of the sediment. There are likely several sources for LMPs existing in surface sediments, but it is difficult to determine contributions of a specific toxin-source in the sediment. Therefore, marine sediments may be a toxin reservoir for LMPs accumulation in benthic organisms via food chains.