期刊
FOOD CHEMISTRY
卷 221, 期 -, 页码 776-782出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2016.11.104
关键词
Quartz crystal microbalance; Aptamer; SELEX; Detection; Salmonella typhimurium
资金
- Arkansas Bioscience Institute [0383 43076-24-2333]
- Chinese Scholarship Council
In this study, quartz crystal microbalance QCM) was used to select aptamers against Salmonella typhimurium. To increase the success rate of Systematic Evolution of Ligands Exponential Enrichment SELEX), the affinity of DNA pool in each round was simultaneously tracked using QCM in order to avoid the loss of high-quality aptamers. When the frequency change reached a maximum value after several rounds of selection and counter-selection, the candidate pool was cloned and sequenced. Out of three aptamer candidates, aptamer B5 showed high specificity and binding affinity with dissociation constant K-d value) of 58.5 nM, and was chosen for further studies. Subsequently, a QCM-based aptasensor was developed to detect S. typhimurium. This aptasensor was able to detect 10(3) CFU/mL of S. typhimurium with less than 1 h. This study demonstrated QCM-based selection could be more effective selection of aptamers and QCM-based aptasensor could be more sensitive in detecting S. typhimurium. (C) 2016 Elsevier Ltd. All rights reserved.
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