Laser-probe-based investigation of the evolution of particle size distributions of calcium oxalate particles formed in artificial urines

Laube, Norbert; Mohr, Bernhard; Hesse, Albrecht

doi:10.1016/s0022-0248(01)01547-0

Cited by 202 publications

(82 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The use of the proposed sensor in artificial urine samples was also investigated by direct analysis of NADH in two different artificial urine samples, described as following: (i) artificial urine was prepared in distilled water with the following constituents and final concentrations: 0.33, 0.12, 0.016, 0.007 and 0.004 mol L -1 of urea, sodium chloride, potassium diphosphate, creatinine and sodium monophosphate, respectively; 30 (ii) artificial urine was also prepared according to Laube et al 31 The solution contains the following constituents and final concentrations: 0.411 mol L -1 urea, 0.0268 mol L -1 potassium chloride, 3 g L -1 sodium chloride and 0.0513, 0.014, 0.0186 and 0.0068 mol L -1 of sodium sulfate, potassium phosphate, ammonium choride and dihydrated calcium chloride, respectively. In both procedures, the pH value of the sample solution was 6.6 (± 0.1).…”

Section: Preparation Of Samplesmentioning

confidence: 99%

Improved NADH Electroanalysis on Nickel(II) Phthalocyanine Tetrasulfonic Acid/ Calf Thymus Deoxyribonucleic Acid/Reduced Graphene Oxide Composite

Ribeiro

Yotsumoto-Neto

Santos

et al. 2017

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

This work describes the electrochemical performance of a novel composite based on nickel tetrasulfonated phthalocyanine (NiTsPc), deoxyribonucleic acid from calf thymus (CT-DNA) and reduced graphene oxide (rGO) for the electroanalysis of reduced β-nicotinamide adenine dinucleotide (NADH), through electrocatalytic oxidation. The modified electrode was denoted as CT-DNA/NiTsPc/rGO. Fourier transform infrared and ultraviolet-visible spectroscopies were performed to characterize the composite material. The electrochemical performance of the composite for NADH oxidation was investigated by cyclic voltammetry (CV), chronoamperometry and differential pulse voltammetry (DPV). The CT-DNA/NiTsPc/rGO modified glassy carbon electrode (GCE) showed an excellent electrocatalytic activity for NADH oxidation with apparent electrocatalytic rate constant (k obs ) of 7.35 × 10 5 L mol -1 s -1 and linear response range for NADH from 1 up to 1350 µmol L -1 for n = 12 (r = 0.999). The proposed sensor shows sensitivity, detection limit and quantification limit of 0.014 µA L mol , respectively. The prepared sensor was further tested for the determination of NADH in artificial human urine samples, showing promising biomedical applications.

show abstract

Section: Preparation Of Samplesmentioning

confidence: 99%

Improved NADH Electroanalysis on Nickel(II) Phthalocyanine Tetrasulfonic Acid/ Calf Thymus Deoxyribonucleic Acid/Reduced Graphene Oxide Composite

Ribeiro

Yotsumoto-Neto

Santos

et al. 2017

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

show abstract

“…The artificial urine medium was prepared according to the methodology described by Laube et al [30]. The chemicals and their respective concentration used for the preparation are shown in Table 1.…”

Section: Artificial Urine Mediummentioning

confidence: 99%

Electrochemical degradation of tetracycline in artificial urine medium

Parra

Gul

Aquino

et al. 2015

J Solid State Electrochem

View full text Add to dashboard Cite

The electrochemical degradation of tetracycline hydrochloride (TeC) was comparatively investigated in artificial urine and chloride-containing media using a one-compartment filter-press flow cell composed of a Ti/Ru 0.3 Ti 0.7 O 2 dimensionally stable anode. The effect of the current density (10-40 mA cm −2 ) on the removal levels attained for TeC and total organic carbon (TOC) (in both media), as well as for urea and creatinine in artificial urine medium, was assessed. The TeC removal rate in the artificial urine medium was much lower than in chloride-containing medium, probably due to the higher consumption of the electrogenerated active chlorine species by the urea and creatinine in the artificial urine medium. Moreover, the obtained removal levels for the urea and creatinine were negligible at current densities lower than 30 mA cm −2 . As TOC abatement was also very small, it is possible that TeC oxidation leads to intermediate compounds. Thus, if current densities less than 20 mA cm −2 are applied, TeC can be selectively removed.

show abstract

“…In this case, the fresh milk was turned sour (at ambient temperature) and NaOH (10 mol·L -1 ) was added to establish the original pH. Synthetic milk and synthetic urine were prepared according to literature [15,22]. Whey solutions were made according to the manufacturer's recommendations.…”

Section: Reagents Analytical Solutions and Samplesmentioning

confidence: 99%

Study of Calcium and Sodium Behavior to Identify Milk Adulteration Using Flame Atomic Absorption Spectrometry

Santos¹,

Costa²,

Pereira-Filho

2012

FNS

View full text Add to dashboard Cite

A fast and direct method for determination of milk adulteration by monitoring of calcium and sodium concentrations variations was described. Milk samples were furnished by a dairy company located at São Carlos (São Paulo State, Brazil) and spiked with tap-water, whey, hydrogen peroxide, synthetic urine, urea and synthetic milk in the ranged from 5% to 50% (v/v), expect for caustic soda. Caustic soda was added in the milk until establish the original pH. The milk samples were analyzed by using flame atomic absorption spectrometry (FAAS) and no acid digestion process was required. Results showed a significant decrease in the Na and Ca concentrations with addition of synthetic milk and tap-water, a nonlinear variation with addition of synthetic urine, whey and hydrogen peroxide and a largest increase in the Na concentration with addition of NaOH. Correlation between Na and Ca concentrations in pure and adulterated milk were evaluated by paired t-test at a 95% confidence level. Results showed that the method proposed is efficient to identify samples adulterated with tap-water, caustic soda, synthetics milk and urine.

show abstract

Laser-probe-based investigation of the evolution of particle size distributions of calcium oxalate particles formed in artificial urines

Cited by 202 publications

References 11 publications

Improved NADH Electroanalysis on Nickel(II) Phthalocyanine Tetrasulfonic Acid/ Calf Thymus Deoxyribonucleic Acid/Reduced Graphene Oxide Composite

Improved NADH Electroanalysis on Nickel(II) Phthalocyanine Tetrasulfonic Acid/ Calf Thymus Deoxyribonucleic Acid/Reduced Graphene Oxide Composite

Electrochemical degradation of tetracycline in artificial urine medium

Study of Calcium and Sodium Behavior to Identify Milk Adulteration Using Flame Atomic Absorption Spectrometry

Contact Info

Product

Resources

About