Biogenic porous silica and silicon sourced from Mexican Giant Horsetail (Equisetum myriochaetum) and their application as supports for enzyme immobilization

Sola-Rabada, A., Sahare, P., Hickman, G.J., Vasquez, M., del Rio, J.A., Canham, L.T., Perry, C.C. ORCID: 0000-0003-1517-468X and Agarwal, V., 2018. Biogenic porous silica and silicon sourced from Mexican Giant Horsetail (Equisetum myriochaetum) and their application as supports for enzyme immobilization. Colloids and Surfaces B: Biointerfaces. ISSN 0927-7765

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Abstract

Porous silica-based materials are attractive for biomedical applications due to their biocompatibility and biodegradable character. In addition, inorganic supports such as porous silicon are being developed due to integrated circuit chip compatibility and tunable properties leading to a wide range of multidisciplinary applications. In this contribution, biosilica extracted from a rarely studied plant material (Equisetum Myriochaetum), its conversion to silicon and the potential for both materials to be used as supports for enzyme immobilization are investigated. E. myriochaetum was subject to conventional acid digestion to extract biogenic silica with a % yield remarkably higher (up to 3 times) than for other Equisetum sp. (i.e. E. Arvense). The surface area of the isolated silica was ∼400 m2/g, suitable for biotechnological applications. Biogenic silicon was obtained by magnesiothermic reduction. The materials were characterized by SEM-EDX, XRD, FT-IR, ICP-OES, TGA and BET analysis and did not contain significant levels of class 1 heavy elements (such as Pb, Cd, Hg and As). Two commercial peroxidases, horseradish peroxidase (HRP) and Coprinus cinereus peroxidase (CiP) were immobilized onto the biogenic materials using three different functionalization routes: (A) carbodiimide, (B) amine + glutaraldehyde and (C) amine + carbodiimide. Although both biogenic silica and porous silicon could be used as supports differences in behaviour were observed for the two enzymes. For HRP, loading onto biogenic silica via the glutaraldehyde immobilization technique (route B) was most effective. The loading of CiP showed a much higher peroxidase activity onto porous silicon than silica functionalized by the carbodiimide method (route A). From the properties of the extracted materials obtained from Equisetum Myriochaetum and the immobilization results observed, these materials appear to be promising for industrial and biomedical applications.

Item Type: Journal article
Publication Title: Colloids and Surfaces B: Biointerfaces
Creators: Sola-Rabada, A., Sahare, P., Hickman, G.J., Vasquez, M., del Rio, J.A., Canham, L.T., Perry, C.C. and Agarwal, V.
Publisher: Elsevier
Date: 23 February 2018
ISSN: 0927-7765
Identifiers:
NumberType
10.1016/j.colsurfb.2018.02.047DOI
S092777651830122XPublisher Item Identifier
Divisions: Schools > School of Science and Technology
Depositing User: Jonathan Gallacher
Date Added: 16 Mar 2018 14:16
Last Modified: 16 Mar 2018 14:16
URI: http://irep.ntu.ac.uk/id/eprint/33010

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