Ashraf Salmanipour; Mohammad Ali Karimi; Alireza Mohadesi; Mohammad Ali Taher; Shabnam Shafiee
Volume 3, Issue 1 , March 2016, , Pages 1-26
Abstract
Considerable interest in the analysis of urea in clinical, environmental and industrial samples has generated diverse research activities in the fabrication of urea biosensors over the past decades. These activities have been directed towards the use of wide ranging materials, including conducting polymers, ...
Read More
Considerable interest in the analysis of urea in clinical, environmental and industrial samples has generated diverse research activities in the fabrication of urea biosensors over the past decades. These activities have been directed towards the use of wide ranging materials, including conducting polymers, non-conducting polymers, redox dyes, redox polymers, oxides, clays, zeolite, sol gel, carbon pastes, epoxy activated support and nanomaterials, for the immobilisation of urease and its use for the detection of urea. Many of these activities have also employed various modes of transduction, including amperometric, potentiometric, conductometric, optical, manometric, thermal and piezoelectric detection, for reliable biosensing of urea. This article reviews the various research efforts that have been carried out over the past decades on the construction and utilisation of urea biosensors for urea analysis in various samples.
Ashraf Salmanipour; Sara Hooshmand
Volume 1, Issue 1 , March 2014, , Pages 1-6
Abstract
In this work, an optical sensor for detection of ascorbic acid is described. The sensor is fabricated by casting and spin-coating silica sol-gel doped with 2,6-dichlorophenol indophenol on the glass plates. The sols are in turn obtained by acidic hydrolysis of various precursors such as tetraethoxysilane, ...
Read More
In this work, an optical sensor for detection of ascorbic acid is described. The sensor is fabricated by casting and spin-coating silica sol-gel doped with 2,6-dichlorophenol indophenol on the glass plates. The sols are in turn obtained by acidic hydrolysis of various precursors such as tetraethoxysilane, triethoxymethylsilane and triethoxyoctylsilane in the presence of 2,6-dichlorophenol indophenol as dopant. Prepared sols then were coated on glass plates to form sol-gel films. UV-Vis spectrophotometric properties of 2,6-dichlorophenol indophenol doped in sol-gel films were studied and compared with in solution. At the optimum conditions the response of film to ascorbic acid is fast and linear in 0.07 – 3.34 mmol L-1 range. Detection limit and relative standard deviation of presented sensor for determination ascorbic acid were 0.05 mmol L-1 and 1.32 %, respectively.
