东海染毒紫贻贝中贝类毒素的分离和鉴定

Isolation and identification of shellfish toxins from contaminated blue mussel(Mytilus edulis) from the East China Sea

目的掌握紫贻贝的染毒情况,对其含有的贝类毒素成分进行分离和鉴定。方法样品经丙酮提取,提取物经乙醚-水液分配,乙醚可溶部分再经硅胶柱层析粗分离、反相高效液相色谱半制备细分离,UPLC-MS/MS监测。结果分离得到4个毒素组分,根据质谱数据以及与pectenotoxin-2(PTX-2)的酶水解产物比较,鉴定组分Ⅰ和Ⅱ分别为pectenotoxin-2 seco acid(PTX-2sa)和7-epi-PTX-2 seco acid(7-epi-PTX-2sa),经LC-MS/MS分析与标准品对照鉴定组分Ⅲ和IV分别为大田软海绵酸(OA)和鳍藻毒素-1(DTX-1)。结论从苍南县市售贻贝中同时分离出腹泻性贝类毒素(DSP)和扇贝毒素类(PTXs),其中游离态的OA、DTX-1及总OA含量超过欧盟限量值,为这次腹泻性贝类中毒的主要原因。

Objective To investigate the contamination of shellfish poisoning of mussels, the poisonous constituents in that were isolated and identified. Methods The mussel tissue homogenate was extracted by acetone, and then the acetone extract was partitioned between diethyl ether and water. The ether extract was fractionated by column chromatography over silica gel and further isolated by semi-preparative RP-HPLC, monitored by ultra performance liquid chromatography coupled with triple quadrupole mass spectrometry. Results Four poisonous constituents were isolated. Two of them were elucidated as pectenotoxin-2 seco acid and 7-epi-pectenotoxin-2 seco acid, respectively, on the basis of mass spectral data and compared with the production of enzymatic hydrolysis of PTX-2, and others were identified as okadaic acid and dinophysistoxin-1 by UPLC-MS/MS analysis compared with standard substances. Conclusion OA, DTX-1,7-epi-PTX-2sa and PTX-2sa had been isolated from the mussel, respectively. The concentrations of free OA, surpassed the maximum permitted levels in EU. OA and toxins responsible for this DSP outbreak. DTX-1 and total OA in which were DTX-1 were confirmed to be the main