消解温度与时间对硅藻检验结果的影响

Effects of Digestive Temperature and Time on Diatom Test

目的探索硅藻检验过程中组织消解温度和消解时间的合理条件。方法取肝组织80份,每份2g,将每份肝组织分别加入2 mL珠江水样混合。设置消解温度为100℃、120℃、140℃、160℃、180℃和消解时间为40、50、60、70、80 min对所取肝组织和水样混合物进行分组,每组8份。使用微波消解-真空抽滤-扫描电子显微镜法对上述检材进行硅藻检验,检测硅藻回收数量和滤膜上的残留物质量。结果消解时间设置为60 min时,不同温度下硅藻的回收数量之间差异有统计学意义(P<0.05),140℃时硅藻回收数量最高,可达(28797.50±6009.67)个,滤膜上的残留物质量在180℃时最低,为(0.60±0.28)mg。消解温度设置为140℃时,不同消解时间的硅藻回收数量之间差异具有统计学意义(P<0.05),40 min时硅藻回收数量最高,可达(20650.88±1950.29)个,各组滤膜上的残留物质量在不同消解时间组之间差异无统计学意义(P>0.05)。结论硅藻消解效果与温度、时间有关,当消解温度为140℃,消解时间为40、50、60 min时利于硅藻检出。

Objective To study the effects of temperature and time for diatoms digestion and find out suitable digestive temperature and time.Methods Eighty pieces of liver tissues were collected,each piece of tissue was 2 g,and 2 mL Pearl River water was added to each piece of tissue.The digestion temperature was set at 100℃,120℃,140℃,160℃,180℃and the digestion time was set at 40,50,60,70,80 min.The liver tissue and water mixture were divided into 8 portions in each group.All the samples were tested by microwave digestive-vacuum filtration-automated scanning electron mi‐croscopy method.The quantity of diatom recovered and the quality of residue on the membrane were re‐corded.Results When the digestion time was set to 60min,there were statistically significant differences in the number of diatoms recovered at different temperatures(P<0.05).The maximum number of dia‐toms recovered was(28797.50±6009.67)at 140℃,and the minimum residue was(0.60±0.28)mg at 180℃.When the digestion temperature was set at 140℃,there were statistically significant differences in the number of diatoms recovered at different digestion times(P<0.05).The number of diatoms re‐covered was the highest at 40 min,it was up to(20650.88±1950.29),and the residue quality of each group had no statistical significance among different digestion time groups(P>0.05).Conclusion The effect of diatom digestion is related to temperature and time.When the digestion temperature was 140℃and the digestion time was 40,50 and 60 min,it is favorable for diatom test.