Showing papers by "George G. Guilbault published in 1992"
TL;DR: A piezoelectric crystal immunobiosensor has been developed for the assay of atrazine herbicides in drinking water and is reversible, being reusable for about eight or nine assays.
162 citations
TL;DR: In this article, the luminol chemiluminescence reaction using potassium hexacyanoferrate(III) as a catalyst was used for the determination of ethanol in beverages.
47 citations
TL;DR: An amperometric enzyme electrode for the determination of L-glutamine in serum samples obtained from healthy volunteers was determined using the probe, and the results correlated well with previously reported values.
Abstract: An amperometric enzyme electrode for the determination of L-glutamine was developed. The probe consisted of a platinum electrode that senses hydrogen peroxide produced from the reactions catalyzed by glutaminase and glutamate oxidase, which are co-immobilized on a preactivated Immobilon-AV Affinity membrane. Protective membranes eliminated interferences from L-glutamate and most compounds electroactive at a similar potential. The response of the probe was linear over the concentration range 1 × 10−6 M to 7.5 × 10−4 M. L-Glutamine in serum samples obtained from healthy volunteers was determined using the probe, and the results correlated well with previously reported values.
24 citations
TL;DR: A penicillin fiber optic sensor based on co‐immobilization of a pH indicator, fluorescein isothiocyanate, andPenicillinase on a preactivated biodyne B membrane attached to the end of a bifurcated optical fiber is described.
Abstract: A penicillin fiber optic sensor is described. The sensor is based on co-immobilization of a pH indicator, fluorescein isothiocyanate (FITC), and penicillinase on a preactivated biodyne B membrane attached to the end of a bifurcated optical fiber. The characteristics of the sensor are investigated in conjunction with a flow injection analysis system. The proposed sensor is reversible and responds to penicillin in the concentration range of 1 × 10−4 to 5 × 10−2 mol/L. The application of this sensor to penicillin analysis in some pharmaceutical samples is demonstrated.
20 citations
TL;DR: In this article, a fiber-optic device for the determination of total and free cholesterol was developed, where cholesterol oxidase and cholesterol esterase are co-immobilized on a preactivated nylon membrane.
14 citations
TL;DR: A flow injection method for the determination of total and free cholesterol is presented, and cholesterol concentration can be related to the absorption of the oxidized dye form at a wavelength of 425 nm.
13 citations