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| Lazerges M, M; Perrot, H; Zeghib N, N; Antoine, Elisabeth; Compere, Chantal. |
| We report on a probe modification of a quartz crystal microbalance (QCM) DNA-biosensor that permits to reversibly change the DNA sequence detected. A QCM DNA-biosensor was designed by immobilization of a 20-base DNA-disulfide probe on the gold-covered quartz surface of a 27 MHz microbalance (9 MHz, third overtone). After immobilization on the gold covered quartz surface, this probe was modified by hybridization with a 45-base DNA that includes the complementary 20-base sequence, a 5-base spacer and a non-complementary 20-base sequence. The non-complementary sequence constitutes a new probe, different from the DNA-disulfide probe, that permits the detection of a new DNA target. As this 45 bases DNA is changeable by dehybridization, successive different DNA... |
| Tipo: Text |
Palavras-chave: QCM; DNA; Biosensor. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-1985.pdf |
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| Lazerges, M; Perrot, H; Antoine, Elisabeth; Defontaine, Audrey; Compere, Chantal. |
| We report the immobilization on a gold surface of a 20-base DNA probe labeled with disulfide group and on the selective hybridization with the complementary 20-base DNA strand. The oligonucleotide probe is the complementary strand of a partial sequence of the gene encoding for a large ribosomal RNA sub-unit which is a coding sequence of Alexandrium minutum DNA, a microalgae that produces neurotoxins responsible for paralytic shellfish poisoning on European and Asian coasts. The kinetics of DNA probe immobilization and hybridization were monitored in situ by using a 27 MHz quartz crystal microbalance under controlled hydrodynamic conditions. The frequency of the setup is stable to within a few hertz, corresponding to the nanogram, scale, for 3 h and makes... |
| Tipo: Text |
Palavras-chave: DNA; Alexandrium minutum; Microbalance. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-1354.pdf |
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