DNA在不同电化学电极表面的固定方式 (a) Immobilisation of ssDNA on glassy carbon electrodes (through deoxyguanosine group (dG)n-DNA) using carbodiimide method (EDC: 1-3(-dimethylaminopropyl)-3-ethyl-carbodiimide;NHS: N-hydroxysulfosuccinimide).---EDC/NHS的使用很常见
(b) Carbodiimide method upon carbon paste bulk modified by stearic acid ( COOH).
(c)Carbodiimide method upon a graphite electrode modified with amino groups (APTES: 3-aminopropyltriethoxysilane). Attachment through 5%
phosphate group of ssDNA, (P)ssDNA.
(d) Attachment through 5% phosphate group of ssDNA onto aminoethanethiol modified gold electrode.
(e) Attachment of ssDNA onto phosphoric acid-terminated surface of a gold electrode (MBPA: mercaptobutylphosphoric acid).
(f) DNA immobilisation onto a mercaptosilane coating of a platinum surface via the amino groups of the bases, (NH2)ssDNA (TMSPT: 3-trimethoxysilyl-1-propanethiol; CDI: N-cyclohexyl-N%-[2-(N-methylmorpholino)-ethyl]-carbodiimide-4-toluene sulfonate).
(g) Immobilisation using functionalised polypyrrole (Py: 3-acetic acid pyrrole; Py : 3-N-hydroxyphthalimide pyrrole; (NH2..DNA): an amino-substituted oligonucleotide).
from:
Biosensors & Bioelectronics 15 (2000) 291–303