Search results for "Quantitative determination"
showing 10 items of 32 documents
Nanomaterial-based cocaine aptasensors.
2015
Up to now, many different methods have been developed for detection of cocaine, but most of these methods are usually time-consuming, tedious and require special or expensive equipment. Therefore, the development of simple, sensitive and rapid detection methods is necessary. In the last decade, aptamers have been used as a new biosensor platform for detection of cocaine in different samples. Aptamers are artificial single-stranded DNA or RNA oligonucleotides capable of binding to specific molecular targets with high affinity and if integrated to nanomaterials, it may lead in precise methods for cocaine detection in the common laboratories. In this review, recent advances and applications of…
Eine einfache Methode des quantitativen Nachweises der Para-Aminosalicyls�ure im Harn
1951
Mitteilung eines einfachen quantitativen Nachweises der PAS im Urin bei Kranken, die mit diesem Medikament behandelt werden. Auf mit Ehrlich-Reagens prapariertem Filtrierpapier wird PAS-haltiger Urin aufgetropft. Der entstehende Farbniederschlag ist je nach PAS-Gehalt mehr oder weniger gelb bis braun-rot verfarbt. Diese Farbung wird mit selbst angefertigten Testfarbungen verglichen und der PAS-Gehalt in der ausgeschiedenen Urinmenge bestimmt.
Quantitative Determination of Renal 99mTc-MAG3 Clearance. A Comparison of Results Acquired Simultaneously in Whole Body Geometry and with a Gamma Cam…
1997
289 patients were simultaneously investigated with a partially shielded whole body counter (Oberhausen) and in camera technique to correlate the values of the MAG3-clearance. Good correlation was found for the often used times schedules of taking blood samples. Late blood samples increase high clearance values in both methods slighly. The shape of the ROI has no influence using camera technique. We conclude, that camera technique can replace the Oberhausen method with a partially shielded whole body counter.
Colloidal crystallization dynamics
1997
At sufficiently strong interparticle interaction, colloidal particles may form ordered crystalline arrays much in analogy to atomic systems. Well characterized model colloidal suspensions have therefore become valuable model systems for the study of the kinetics of crystal nucleation, growth and ripening. Significant progress has been made in this area throughout the past few years. Precise control of interaction parameters and new instrumental developments have allowed for quantitative determination of nucleation rate densities and growth velocities in monodisperse ‘hard’ and ‘soft sphere’ systems. Results confirm classical theories of nucleation and growth adapted to colloidal systems. Th…
Polymere acroleine. III. Mittteilung. Oximierung und quantitative Bestimmung der Aldehydgruppen
1956
Die Oximierung von Disacryl wird beschrieben. Ferner werden Bedingungen fur eine quantitative Bestimmung von Aldehydgruppen in polymeren Acroleinen mitgeteilt. Es wird festgestellt, das Disacryl und ein durch Redox-Polymerisation gewonnenes Polyacrolein etwa 65% reaktionsfahige Aldehydgruppen enthalten. Bei Polyacroleinen, die mittels Borfluorid-Atherat oder Kaliumcarbonat gewonnen wurden, betragt der Umsatz mit Hydroxylamin nur etwa 20% d. Th. The oximation reaction of disacryl is described. The conditions of a quantitative determination of aldehyde function in polymeric acroleins have been investigated. It has been shown, that disacryl and an other polyacrolein, prepared by a redox-polyme…
Polarographische Untersuchungen an monomeren und polymeren N-Chlorcarbonamiden
1979
The polarographic reduction of low molecular and high molecular N-chlorocarboxamides at the dropping mercury electrode proceeds in two one-electron-transfer steps, which are highly irreversible. In the case of the low molecular models 1 and 2 the reaction is diffusion-controlled, whereas in the case of the poly(N-chloroamide) 3 the reaction is adsorption-controlled. Reduction of several poly(N-chloroamide)s shows always two reduction waves with a distance of 0,5 V. There is, however, no relation between the polyamide-type and the position of the half-wave potentials. The polarographic reduction can be used as an analytical method for quantitative determination of N-chlorocarboxamide groups …
Dependence of 85Kr(β)-Clearance rCBF Determination on the Input Function
1969
Two procedures have been proposed for the quantitative determination of rCBF by analysis of radioactive inert gas clearance curves, following intra-arterial injection: 1. the slope-method [1], 2. the height-over-area-method [4].
Date-rape evidence through fast determination of γ-butyrolactone in adulterated beverages.
2021
Abstract An infrared spectroscopy (IR) based methodology has been developed to determine γ-butyrolactone (GBL) in adulterated beverages. The proposed method permits the direct screening of GBL in beverages and involves a minimum sample treatment requiring less than 2 min for quantitative determination of GBL. Sensitivity of IR method was improved by using liquid-liquid extraction (LLE) providing detection limits of 0.023 mg g−1. Accuracy of the proposed methodology was evaluated through the analysis of soft beverages and alcoholic cocktails spiked with GBL at concentration levels ranging from 0.075 to 10 mg g−1 providing recovery values from 91 to 100%. GBL was determined in twelve blind-sp…
Quantitative determination of casein genetic variants in goat milk: Application in Girgentana dairy goat breed
2016
The study was conducted to develop a high-performance liquid chromatographic (HPLC) method to quantify casein genetic variants (αs2-, β-, and κ-casein) in milk of homozygous individuals of Girgentana goat breed. For calibration experiments, pure genetic variants were extracted from individual milk samples of animals with known genotypes. The described HPLC approach was precise, accurate and highly suitable for quantification of goat casein genetic variants of homozygous individuals. The amount of each casein per allele was: αs2-casein A = 2.9 ± 0.8 g/L and F = 1.8 ± 0.4 g/L; β-casein C = 3.0 ± 0.8 g/L and C1 = 2.0 ± 0.7 g/L and κ-casein A = 1.6 ± 0.3 g/L and B = 1.1 ± 0.2 g/L. A good correl…
ARYL-VINYLSULFONE—REAGENTIEN ZUM SCHUTZ UND NACHWEIS VON THIOLFUNKTIONEN
1983
Abstract Aryl vinyl sulfones selectively react with thiol groups to acid-stable compounds which easily are cleaved by mild bases to thiol compounds. Ester and amide groups are not attacked under these conditions. Therefore, these compounds are good protecting groups or labels in peptide chemistry. The following aryl vinyl sulfones were investigated: phenyl vinyl sulfone 1, p-carbethoxyphenyl vinyl sulfone 15 and the fluorescent 5-dimethylaminonaphthyl 1-vinyl sulfone 5 and 5-methoxynaphthyl-1 vinyl sulfone 10. The last two compounds are very useful reagents for the quantitative determination of SH-groups in polypeptides such as enzymes. Aryl-vinylsulfone reagieren selektiv mit Thiolgruppen …