Publicado

2017-07-01

Immobilization of recognition elements on a self-assembled monolayers bio-platform

Inmovilización de elementos de reconocimiento en una bio-plataforma basada en capas auto-ensambladas

Palabras clave:

functionalized surface, biosensor, polydiacetylene liposome, biotin-streptavidin, 3-aminopropyltriethoxysilane (en)
superficie funcionalizada, biosensor, liposomas de polidiacetileno, biotina-estreptavidina, aminopropiltrietoxisilano (es)

Autores/as

Tailored materials formed by spontaneous two-dimensional arrangement of 3-aminopropyltriethoxysilane self-assembled monolayer on glass (amino-functionalized glass) has been exploited to attach biomolecules in well-organized structures useful in biosensing.  Succinimidyl ester of both unpolymerized diacetylene liposome (NHS-DA-liposome) layer and PEGylated biotin (Bt-PEG-NHS) matrix were covalently bonded to the amino-functionalized glass by the NHS linker, and exposed to either Tyrosinase (Ty) or Streptavidin (SAV) solution. The interaction between Ty and polymerized NHS-PDA-liposome transformed the planarity of the PDA backbone, and a blue-to-red transition occurred; Bt-PEG attached to the fluorescent-SAV by bioaffinity.  Sensing capability of bioplatform systems was evaluated by Uv-vis spectroscopy or fluorescence microscopy. Biomolecule functionalized SAMs retained the recognition potential of colorimetric Ty-PDA-liposome after biological interaction, and also facilitated the fabrication of a protein-resistant matrix with a particular affinity property.  This surface chemistry is accessible to depositing proteins on both SAM-coated glass surface, and tethered to SAM, resulting in optical bioplatform arrays.
Los materiales funcionalizados por adsorción sobre capas autoensambladas de 3-aminopropiltrietoxisilano (APTS) en vidrio (vidrio amino-funcionalizado) sirven para inmovilizar biomoléculas en estructuras usadas para biosensores.  Liposomas de polidiacetileno (lip-PDA-NHS) y Biotin PEGilado con NHS se inmovilizaron aprovechando el éster de succinimidilo; y sirvieron para reconocer Tirosinasa o streptavidina (SAV). Debido a la interacción liposoma-PDA-Ty, ocurrió un cambio en la planaridad de la cadena polimérica PDA, percibido como una transición de azul-a-rojo; mientras que, la biotina inmovilizada interactúo con SAV por afinidad biológica.  La capacidad de detección del sistema se evaluó por espectroscopia UV-vis o por microscopia de fluorescencia.  Las capas de APTS funcionalizadas con biomoléculas retuvieron la capacidad de reconocimiento colorimétrico después de la interacción biológica, permitiendo la fabricación de una matriz resistente a proteínas con una propiedad de bioafinidad.  Esta química de superficies es simple y accesible para la modificación de substratos de vidrio, útiles en arreglos de bioplataformas ópticas.

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