A disposable ion-selective optode for mercury based on trityl-picolinamide (T-Pico) as neutral ionophore was developed. The sensing layer consist of plasticised PVC incorporating T-Pico as a selective ionophore for Hg2+, ETH 5418 as a chromoionophore, and potassium tetrakis[3,5-bis(trifluoromethyl)phenyl] borate as Read More …
Month: October 2017
Tripodal Receptors for Cation and Anion Sensors
This review discusses different types of artificial tripodal receptors for the selective recognition and sensing of cations and anions. Examples on the relationship between structure and selectivity towards cations and anions are described. Furthermore, their applications as potentiometric ion sensing 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 …
Optical fibre biosensors based on immobilised enzymes
This review gives a general overview of optical fibre biosensors, their sensing principles and associated instrumental set-up. The techniques for the immobilization of enzymes is also covered. Enzyme-based optical biosensors are classified according to the type of optical transducer (including Read More …
Selective pool optode for mercury ion sensing in aqueous solution
A selective pool optode for mercury ion sensing has been developed. The selectivity of sensor operation is based on the reagent pool of safranin–iodide solution trapped behind the Nafion membrane, which is highly permeable to cations and excludes all anions Read More …