Response of DNA fragments to potentiometric sensors studied using HPLC

Luc J Nagels, Joseph Everaert, Hugo Bohets, Jurgen Del Favero, Dirk Goossens, Johan Robbens, Marek Pietraszkiewicz, Oksana Pietraszkiewicz

    Onderzoeksoutput: Bijdrage aan tijdschriftA1: Web of Science-artikelpeer review


    Potentiometric sensors are studied as viable candidates for the construction of high throughput DNA arrays. For preliminary investigations, such sensors were used in an HPLC setup in the present work. This avoided errors due to ionic contaminants or additives in the commercial samples. The oligonucleotides dT(10), dT(20) and dT(30) were used as test substances. The potentiometric sensors were of the coated wire type, containing PVC, DOP, MTDDACl and a synthetic podand urea receptor. The HPLC system consisted of a reversed phase column eluted with a phosphate buffer, triethylammoniumacetate (TEAA), and an acetonitrile gradient. Molar responses and sensitivities increased with increasing chain length of oligonucleotides, yielding detection limits as low as 10(-6)M (dT(30), injected concentration). The slopes of the calibration graphs were at least 23 mV/decade (dT(10)), which was much higher than expected. The results are discussed in view of the potential use of this sensor type in high throughput microarrays.
    Oorspronkelijke taalEngels
    TijdschriftCombinatorial Chemistry & High Throughput Screening
    Pagina's (van-tot)555-9
    Aantal pagina’s5
    PublicatiestatusGepubliceerd - 2007


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