汪河,王莉,申慧彦,李卫华.水质细菌总数FISH检测技术的优化[J].安徽建筑大学学报,2022,30(1):46-54 |
水质细菌总数FISH检测技术的优化 |
Optimization of Fluorescence in Situ Hybridization (FISH) for the Total Bacterial Count in Water |
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DOI: |
中文关键词: 水质细菌总数 FISH技术 优化 稳定性 |
英文关键词: total bacterial count in water FISH technology optimization stability |
基金项目:国家自然科学基金项目(51978003);安徽省重点研发项目(1704a0902006);安徽省科技重大专项(17030801028) |
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中文摘要: |
在水质卫生检测方面,FISH 具有检测快速、可检测指标多样、检出微生物数量准确等优势。但因其 结果稳定性较差,尚不能替代培养计数法成为标准方法。本研究从影响结果稳定性的细胞制片、蛋白酶 K 消 化时间、探针浓度和杂交时间四个方面优化 FISH 技术。结果表明,46 ℃、2 h 烘烤制片可明显减少因洗涤造 成的细胞流失;终浓度 10 μg/mL 的蛋白酶 K 经 37 ℃、2 min 消化可使样品得到较高的荧光信号且背景干扰少; 探针终浓度 5 ng/μL,46 ℃、5 h 的条件下可促进寡核苷酸探针 EUB338 mix 与细菌细胞充分杂交。优化后的 FISH 定量结果较稳定,三次实验的荧光细胞数量无明显差异(P>0.05)。本研究为水质细菌总数检测的 FISH 法走向标准化提供了一定的技术基础。 |
英文摘要: |
Fluorescence in Situ Hybridization (FISH) is a water testing technique with the advantages of rapid detection,various detectable indexes,and accurate detection of microbial quantities. However,its results are not stable enough to replace the counting method as a standard method. In this study,the FISH technique was optimized in four aspects,namely,cell sample preparation, proteinase K digestion time,probe concentration and hybridization time,which affect the stability of the results. The results showed that the washing-caused cell loss could be significantly reduced by baking the glass slides at 46 ℃ for 2 hours. The digestion of proteinase K at a final concentration of 10 μg/mL at 37 ℃ for 2 minutes could result in a high fluorescence signal with less background interference. The probe final concentration of 5 ng/μL at 46 ℃ for 5 hours could facilitate the hybridization of the oligonucleotide probe EUB338-mix and bacterial cells. The optimized FISH technique showed good stability,and there was no significant difference in the number of fluorescent cells among the three experiments (P>0. 05). This study provides a technical basis for the standardization of FISH method for the detection of total bacterial count in water. |
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