Optimized immobilization of lectins using self-assembled monolayers on polysilicon encoded materials for cell tagging

Penon, Oriol; Siapkas, Dimitrios; Novo, Sergi; Dur�n, Sara; Oncins, Gerard; Errachid, Abdelhamid; Barrios, Lleonard; Nogu�s, Carme; Duch, Marta; Plaza, Jos� Antonio; P�rez-Garc�a, Llu�sa

Abstract

Self-assembled monolayers (SAMs) have been used for the preparation of functional microtools consisting of encoded polysilicon barcodes biofunctionalized with proteins of the lectin family. These hybrid microtools exploit the lectins ability for recognizing specific carbohydrates of the cell membrane to give an efficient system for cell tagging. This work describes how the control of the methodology for SAM formation on polysilicon surfaces followed by lectin immobilization has a crucial influence on the microtool biofunction. Several parameters (silanization time, silane molar concentration, type of solvent or deposition methodology) have been studied to establish optimal function. Furthermore, silanes incorporating different terminal groups, such as aldehyde, activated ester or epoxide groups were tested in order to analyze their chemical coupling with the biomolecules, as well as their influence on the biofunctionality of the immobilized protein. Two different lectins - wheat germ agglutinin (WGA) and phytohemagglutinin (PHA-L) - were immobilized, because they have different and specific cell recognition behaviour and exhibit different cell toxicity. In this way we can assess the effect of intrinsic bulk toxicity with that of the cell compatibility once immobilized as well as the importance of cell affinity. A variety of nanometrical techniques were used to characterize the active surfaces, and lectin immobilization was quantified using ultraviolet-visible absorption spectroscopy (UV-vis) and optical waveguide light mode spectroscopy (OWLS). Once the best protocol was found, WGA and PHA were immobilized on polysilicon coded barcodes, and these microtools showed excellent cell tagging on living mouse embryos when WGA was used. © 2013 Elsevier B.V.

• Journal Article Type: Article
• Acceptance Date: Dec 21, 2013
• Online Publication Date: Dec 30, 2013
• Publication Date: Apr 1, 2014
• Deposit Date: Jan 8, 2020
• Journal: Colloids and Surfaces B: Biointerfaces
• Print ISSN: 0927-7765
• Electronic ISSN: 1873-4367
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 116
• Pages: 104-113
• DOI: https://doi.org/10.1016/j.colsurfb.2013.12.053
• Keywords: Biotechnology; Physical and Theoretical Chemistry; Colloid and Surface Chemistry; Surfaces and Interfaces; General Medicine
• Public URL: https://nottingham-repository.worktribe.com/output/3691374
• Additional Information: This article is maintained by: Elsevier; Article Title: Optimized immobilization of lectins using self-assembled monolayers on polysilicon encoded materials for cell tagging; Journal Title: Colloids and Surfaces B: Biointerfaces; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.colsurfb.2013.12.053; Content Type: article; Copyright: Copyright © 2013 Elsevier B.V. All rights reserved.