Biomedical subjects

B López Ruiz

Publications and source records attributed to B López Ruiz.

3 recordsLinked to original sources

PubMed1999

Ion chromatographic determination of chloride in mustard sauces.

A new, simple, precise, and rapid ion chromatography (IC) method has been developed to determine chloride in mustard sauces using a mixture of phthalic acid, acetone, and water adjusted to pH 5.0 as eluent. Conductometric detection was carried out. The retention time for chloride was 1.5 min. Linearity was obtained up to a concentration level of 100 mg/L NaCl. The method was statistically evaluated for accuracy and precision after being used to assay the chloride from mustard sauces. Within the same samples, the chloride levels obtained by IC were compared with the sodium concentrations quantified by atomic absorption spectrophotometry.

Chlorides↗

PubMed1996

Enzymic determinations with rotating bioreactors and continuous-flow-stopped-flow processing. Determination of choline esters in pharmaceuticals.

The neuromuscular blocking agent, succinylcholine, and the neurotransmitter, acetylcholine, have been determined in pharmaceutical preparations utilizing a sensing unit comprised of a rotating bioreactor and an amperometric detector. The bioreactor consisted of a rotating disk made of Teflon (1 cm id) with cholinesterase (EC 3.1.1.8) and choline oxidase (EC 1.1.3.17) co-immobilized on the top surface of the disk. Amperometric detection of H2O2 and initial rate measurements were employed for quantification.

Acetylcholine↗

PubMed1994

Application of the quadratic response surface in the polarographic determination of lead: biological samples.

Differential-pulse polarography was applied to lead determination in blood, urine and hair samples after pressurized acid digestion. Quantitative determination was carried out using a single analytical measurement of the experimental sample (without the need for addition or calibration methods), using the equation calculated as a result of the study of the quadratic response surface. The elimination of the possible interferences has been considered. The reliability of the analytical procedure was evaluated using relative standard deviations (2.34-11.93%) and recovery (97.28-103.92%) measurements.

Environmental Pollutants↗