Methods and materials for optimization of electronic...

C - Chemistry – Metallurgy – 12 – Q

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C12Q 1/68 (2006.01) G01N 27/447 (2006.01)

Patent

CA 2264780

The following inventions relate to discoveries concerning the various parameters, electrolytes (buffers), and other conditions which improve or optimize the speed of DNA transport, the efficiency of DNA hybridization reactions, and the overall hybridization specificity in microelectronic chips and devices. In particular, this invention relates to the discovery that low conductance zwitterionic buffer solutions, especially those containing the amino acid Histidine prepared at concentrations of ~50 mM and at or near the pI (isoelectric point ~pH 7.47), provide optimal conditions for both rapid electrophoretic DNA transport and efficient hybridization reactions. Hybridization efficiencies of at least a factor of 10 relative to the next best known buffer, Cysteine, are achieved. Test data demonstrate an approximately 50,000 fold increase in hybridization efficiency compared to Cysteine.

La présente invention concerne des découvertes se rapportant aux divers paramètres, électrolytes (tampons) et autres conditions permettant d'améliorer ou d'optimiser la vitesse de déplacement de l'ADN, le rendement des réactions d'hybridation d'ADN et la spécificité d'hybridation globale de puces et dispositifs microélectroniques. L'invention concerne en particulier la découverte selon laquelle des solutions tampons zwittérioniques de faible conductance, notamment celles contenant l'aminoacide histidine préparé à des concentrations de SIMILAR 50 mM et à un point pHi ou proche du pHi (point isoélectrique SIMILAR pH 7,47), offrent des conditions optimales pour un transfert électrophorétique rapide de l'ADN et des réactions d'hybridation efficaces. Des rendements d'hybridation d'au moins un facteur de 10 par rapport au meilleur tampon connu après celui de l'invention, la cystéine, sont obtenus. Des données d'essai montrent une efficience d'hybridation augmentée d'environ 50 000 fois, comparée au résultat de la cystéine.

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