Immobilization of silver ions onto paramagnetic particles for binding and release of a biotin-labeled oligonucleotide

Jaime E. Ramírez-Vick, Antonio A. García, James Lee

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Paramagnetic particles with amino functional groups can be derivatized using glutaraldehyde and thiourea in order to immobilize silver ions. The silver immobilization procedure did not alter the surface morphology of the particles according to Tapping mode AFM imaging. Rutherford backscattering showed that silver resides on the particle surface while iron is present throughout the particle. Particle-Induced X-Ray Emission spectroscopy determined that the derivatized particles have a silver capacity of 7 wt%. Paramagnetic particles containing immobilized silver ions have an affinity binding constant of the order 108 for mono- and tri-biotin-labeled oligonuceotide with primary sequence 3′-GCCCCTTTTTAAAAACCCCG-5′ while the original amino particles have little affinity for the oligonucleotide. Measurement of binding and release was enabled by attaching either fluorescein isothioocyanate (FITC) to the 3′-end or Texas Red or fluorescein phosphoramidite (FAM) to the 5′-end of the oligonucleotide. Up to a 97% release of the FAM labeled biotinylated oligonucleotide from the particle surface can be achieved using an aqueous solution of thiodiglycol.

Original languageEnglish (US)
Pages (from-to)53-62
Number of pages10
JournalReactive and Functional Polymers
Volume43
Issue number1
DOIs
StatePublished - Feb 16 2000

Fingerprint

Oligonucleotides
Biotin
Silver
Immobilization
immobilization
silver
Ions
Fluorescein
ion
X-Ray Emission Spectrometry
Thiourea
Thioureas
Rutherford backscattering spectroscopy
Glutaral
Functional groups
Surface morphology
Iron
particle
Imaging techniques
functional group

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics

Cite this

Immobilization of silver ions onto paramagnetic particles for binding and release of a biotin-labeled oligonucleotide. / Ramírez-Vick, Jaime E.; García, Antonio A.; Lee, James.

In: Reactive and Functional Polymers, Vol. 43, No. 1, 16.02.2000, p. 53-62.

Research output: Contribution to journalArticle

Ramírez-Vick, Jaime E. ; García, Antonio A. ; Lee, James. / Immobilization of silver ions onto paramagnetic particles for binding and release of a biotin-labeled oligonucleotide. In: Reactive and Functional Polymers. 2000 ; Vol. 43, No. 1. pp. 53-62.
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