کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6604305 | 1424093 | 2018 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Magnetic silica/titania xerogel applied as electrochemical biosensor for catechol and catecholamines
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
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چکیده انگلیسی
A magnetic silica/titania material with planned textural properties was obtained by sol-gel method through hydrolysis and condensation of tetraethyl orthosilicate and titanium isopropoxide in the presence of magnetite particles. The resultant material (SiTiMPs) was used as support for direct immobilization of tyrosinase (SiTiMPs-Ty) avoiding additional modification steps. This was possible due to the chemical reactivity of titania due to its surface acidity and also to the textural properties of the material like pore size near 20â¯nm and specific surface area of 158â¯m2â¯gâ1. These characteristics combined to the presence of magnetite lead to possibility to prepare carbon paste electrodes with SiTiMPs-Ty material with high electroactive area when tested in the ferricyanide/ferrocyanide redox system. This electrode was applied as efficient electrochemical biosensor for catechol and catecholamines, such as dopamine and epinephrine. It can be observed great sensitivities for all analytes tested in wide linear range. The calculated detection limits were 0.23â¯Î¼molâ¯Lâ1, 0.72â¯Î¼molâ¯Lâ1 and 2.94â¯Î¼molâ¯Lâ1 for catechol, dopamine and epinephrine, respectively. This electrode presented excellent response for simultaneous analyses of catechol and epinephrine, with high sensitivity and low detection limits. The present sensor showed good reproducibility for catechol detection with a relative standard deviation of 6.9% (nâ¯=â¯5).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 264, 20 February 2018, Pages 319-328
Journal: Electrochimica Acta - Volume 264, 20 February 2018, Pages 319-328
نویسندگان
Franciele de Matos Morawski, Monique Deon, Sabrina Nicolodi, Eliana Weber de Menezes, Tania Maria Haas Costa, Silvio LuÃs Pereira Dias, Edilson Valmir Benvenutti, Leliz Ticona Arenas,