Selection of aptamers targeted to food-borne pathogenic bacteria .

() is a common marine halophilic food-borne pathogen, mainly found in seafood and food with a high salt content. Gastrointestinal reactions such as diarrhea, headache, vomiting, nausea, and abdominal cramps may occur after eating food infected with . This study aimed to screen for high-affinity aptamers that specifically recognize . A high-affinity modified aptamer screening kit was used to rapidly screen aptamers of the food-borne . The first round of screening involved release of target aptamers from the microspheres. The "false-positive" aptamers were eliminated after specific binding to and elution of in the second round. The second round of screening of the aptamers involved polymerase chain reaction (PCR), and the abundance of a sequence was determined using next-generation sequencing. Nine high-affinity aptamer sequences were obtained, and the first eight modified aptamer sequences were derived using a cloud-based intelligent software of the American AM Biotech Co. was used as a control, and aptamer ID 12 with the highest affinity for was selected using real-time PCR. According to the principle of color change caused by nano-gold condensing under salt induction, , , and were used as counter-screening bacteria, and the aptamer ID12 was combined with nano-gold. The results showed that aptamer ID12 has strong specificity for . Based on these findings, this study developed a simple, innovative, and rapid method for screening aptamers.