Journal
SENSORS
Volume 16, Issue 12, Pages -Publisher
MDPI AG
DOI: 10.3390/s16122052
Keywords
potentiometric aptasensing; Vibrio alginolyticus; DNA nanostructures; magnetic beads; protamine
Funding
- Chinese Academy of Sciences [XDA11020702]
- National Natural Science Foundation of China [41176081, 21475148, 21575158]
- Taishan Scholar Program of Shandong Province
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A potentiometric aptasensing assay that couples the DNA nanostructure-modified magnetic beads with a solid-contact polycation-sensitive membrane electrode for the detection of Vibrio alginolyticus is herein described. The DNA nanostructure-modified magnetic beads are used for amplification of the potential response and elimination of the interfering effect from a complex sample matrix. The solid-contact polycation-sensitive membrane electrode using protamine as an indicator is employed to chronopotentiometrically detect the change in the charge or DNA concentration on the magnetic beads, which is induced by the interaction between Vibrio alginolyticus and the aptamer on the DNA nanostructures. The present potentiometric aptasensing method shows a linear range of 10-100 CFU mL(-1) with a detection limit of 10 CFU mL(-1), and a good specificity for the detection of Vibrio alginolyticus. This proposed strategy can be used for the detection of other microorganisms by changing the aptamers in the DNA nanostructures.
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