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        Aptamer-based Depletion of Small Molecular Contaminants: A Case Study Using Ochratoxin A

        Emilia Schax,Maren Lönne,Thomas Scheper,Shimshon Belkin,Johanna-Gabriela Walter 한국생물공학회 2015 Biotechnology and Bioprocess Engineering Vol.20 No.6

        Based on the increasing demand for detection and depletion of small molecules like mycotoxins or pesticides in food, water, or pharmaceuticals, aptamers are gaining more importance as sensitive, specific-depletion molecules. Here, we present an aptamer-based method for depletion of ochratoxin A (OTA) as a model system and show the advantages and the limitations of aptamers in the depletion of small molecular contaminants. OTA is a mycotoxin produced by various Penicillium and Aspergillus strains and is often found in grain and grain derivatives. We immobilized a well-described DNA aptamer against OTA on an agarose gel and used the column as a clean-up system. The aptamer shows a high specificity and sensitivity for OTA: Ochratoxin B, a molecule similar to OTA, was not bound by the aptamer; and a control oligonucleotide was not able to bind OTA. After optimizing the process for better economic feasibility, the column could be used for several times without loss of aptamer activity. We investigated the location of immobilized aptamer within the gel using fluorescent-labeled aptamers. Furthermore, beer samples spiked with OTA were used to investigate aptamer activity in complex samples. Using these complex samples we have observed a significant loss of aptamer activity. We have further investigated this limitation by performing microscale thermophoresis experiments to determine the KD values of the aptamer in different complex samples like beer, coffee, juice and wine. Our results indicate that the applicability of aptamers to real processes is currently restricted by the selection buffer used during its selection process (SELEX). We therefore suggest using conditions closer to those of the later application of the aptamer during future SELEX experiments.

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