A selective tripodal chemosensor based on 1,1,1-tris[(7-nitrobenzofurazan-4-yl)-n-1-aza-5-oxahexanyl] propane (1, TNFHP) has been developed for the detection of Hg(II) ions. This receptor exhibits a pronounced chromogenic behavior toward Hg(II) ions by changing the color of the solution from yellow to dark Read More …
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An Optical Fiber Biosensor for Heavy Metal Ions Based on a Modified Single Sol-Gel Film of Urease and Chlorophenol Red in Flow System
An optical fiber biosensor based on a modified single sol gel film consisting of urease and chlorophenol red (CPR) was employed to detect heavy metal ions in aqueous samples. The modification relies on addition of poly(vinyl alcohol) (PVA) into sol-gel Read More …
Selective chemosensor for Hg(II) ions based on tris[2-(4-phenyldiazenyl)phenylaminoethoxy]cyclotriveratrylene in aqueous samples
A novel chemosensor, based on tris[2-(4-phenyldiazenyl)phenylaminoethoxy]cyclotriveratrylene (TPPECTV) as chromophore, has been developed for the colorimetric determination and visual detection of Hg(II) ions. TPPECTV exhibits a pronounced chromogenic behavior toward Hg(II) ions by changing the color of the solution from yellow Read More …
An optical fiber biosensor for chlorpyrifos using a single sol-gel film containing acetylcholinesterase and bromothymol blue
An optical fiber biosensor consisting of acetylcholinesterase (AChE) and bromothymol blue (BTB) doped sol–gel film was employed to detect organophosphate pesticide chlorpyrifos. The main advantage of this optical biosensor is the use of a single sol–gel film with immobilized AChE Read More …
Enzyme Inhibition Based Biosensors for Environmental Monitoring
A review of methods based on enzyme inhibition in environmental monitoring is presented, which is mainly focussed on the detection of pollutants, such as pesticides, heavy metal ions and other toxic compounds. The sensing principles, design of the biosensor and Read More …
Strip test for ascorbic acid based on immobilised Prussian blue onto modified PVA membrane
A strip test based on immobilised Prussian blue (PB) onto modified polyvinyl alcohol (PVA) membrane has been developed for simple determination of ascorbic acid (AA) in beverage samples. The PVA as a solid support matrix has been modified using hydrogen Read More …
Non-invasive optical chemical sensor based on polyaniline films for detection of ammonia and acetic acid solutions
Polyanilines (PANI) are viable materials for use in optical chemical sensor. Thin films of PANI readily deposit on polystyrene sheets when aniline is chemically polymerised in hydrochloride acid solution. The films have been characterised by absorption spectra in visible region Read More …
Optical detection of uric acid based on immobilised ferriin onto modified PVA membrane
Fabrication of an optical chemical sensor based on immobilised tris (1,10-phenantroline)-iron(III) complex (ferriin) onto modified polyvinyl alcohol (PVA) membrane for the determination of uric acid (UA) is described. The immobilised ferriin will be reduced to tris (1,10-phenantroline)-iron(II) complex (ferroin) in Read More …
Recent Advances in Optical DNA Biosensors Technology
Recent advances in nucleic acids-based biosensors have led to the development of DNA biosensors for DNA hybridisation detection and for nucleic acid-ligand binding studies. This review presents a concise description and an evaluation of the optical devices that have been Read More …
Simple optical fibre biosensor based on immobilised enzyme for monitoring of trace heavy metal ions
A simple optical fibre biosensor based on immobilised enzyme for monitoring of trace heavy metal ions has been developed. The biosensor recognition system was designed based on the inhibition of urease activity, where the urease is immobilised on ultrabind membrane. Read More …