He Y, Zhang J, Tian R, Lu Y, Pan L, Zhang Y. Selected ssDNA aptamers-graphene oxide based fluorescent biosensor to detect sulfameter in milk.
LUMINESCENCE 2023;
38:518-526. [PMID:
36882911 DOI:
10.1002/bio.4473]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 02/28/2023] [Accepted: 03/02/2023] [Indexed: 03/09/2023]
Abstract
The abuse of sulfameter (SME) in animal husbandry can cause drug resistance and toxic or allergic reactions in humans. Therefore, it is very important to establish a simple, inexpensive and efficient method for detecting SME in food. In this work, we propose a single fluorescent aptamer/graphene oxide (GO)-based biosensor to detect SME residues in milk. Aptamers that specifically bind to SME were screened by capture-SELEX using an ssDNA library immobilized on magnetic beads. The 68 active candidate aptamers were chemically synthesized for specificity and affinity characterization. Among the aptamers, the aptamer sulf-1 revealed the highest affinity (Kd =77±15 nM) to SME and was selected to construct a GO-based fluorescent biosensor for real milk sample detection. Under optimal conditions, the single fluorescent aptasensor had a wide linear range (R2 was 0.997) from 7 to 336 ng/mL and low detection limit of 3.35 ng/mL that was calculated with a 3 SD/slope. The single fluorescent method was also validated by SME-fortified milk samples, showing average recoveries ranging from 99.01% to 104.60% with a relative standard deviation below 3.88%. These results demonstrate that this novel aptamer sensor provides an opportunity for sensitive, convenient and accurate detection of SME residues in milk.
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