A novel phosphoramidite method for automated synthesis of oligonucleotides on glass supports for biosensor development.

Abstract:

:Two protocols for functionalization of glass supports with hexaethylene glycol (HEG)-linked oligonucleotides were developed. The first method (standard amidite protocol) made use of the 2-cyanoethyl-phosphoramidite derivative of 4,4'-dimethoxytrityl-protected HEG. This was first coupled to the support by standard solid-phase phosphoramidite chemistry followed by extension with a thymidylic acid icosanucleotide. Stepwise addition of the linker phosphoramidite graduated at 1% (relative to the total sites available) per step at 50 degrees C resulted in an optimal yield of immobilized oligonucleotides at a density of 2.24 x 10(10) strands/mm2. This observed loading maximum lies well below the theoretical maximum loading owing to nonspecific adsorption of HEG on the glass and subsequent blocking of reactive sites. Surface loadings as high as 3.73 x 10(10)/mm2 and of excellent sequence quality were achieved with a reverse amidite protocol. The support was first modified into a 2-cyanoethyl-N,N-diisopropylphosphoramidite analog followed by coupling with 4,4'-dimethoxytrityl-protected HEG. This protocol is conveniently available when using a conventional DNA synthesizer. The reverse amidite protocol allowed for control of the surface loading at values suitable for subsequent analytical applications that make use of immobilized oligonucleotides as probes for selective hybridization of sample nucleic acids of unknown sequence and concentration.

authors

Sojka B,Piunno PAE,Wust CC,Krull UJ

doi

10.1385/abab:89:1:85

subject

Has Abstract

pub_date

2000-10-01 00:00:00

pages

85-103

issue

1

eissn

0273-2289

issn

1559-0291

pii

ABAB:89:1:85

journal_volume

89

pub_type

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