scholarly journals A New Method for the Quantitative Determination of Pectin in Plant Materials by Colloid Titration

1956 ◽  
Vol 20 (1) ◽  
pp. 29-35 ◽  
Author(s):  
Satoshi OKIMASU
Keyword(s):  
Quantitative Determination ◽  
New Method ◽  
Plant Materials ◽  
Colloid Titration

AGGLUTINATION INHIBITION REACTIONS FOR THE DETERMINATION OF GONADOTROPHINS

1969 ◽  
Vol 62 (1_Suppl) ◽  
pp. S95-S112 ◽  
Author(s):  
A. H. W. M. Schuurs
Keyword(s):  
Immune System ◽  
Quantitative Determination ◽  
Haemagglutination Inhibition ◽  
Latex Agglutination ◽  
Literature Survey ◽  
New Method ◽  
Test Fluid ◽  
Main Application ◽  
Test Systems

ABSTRACT Various techniques for sensitising erythrocytes and latex particles with gonadotrophins, particularly with HCG, are described. The haemagglutination inhibition reactions are generally interpreted by means of »erythrocyte settling patterns«. By a new method of evaluating these patterns a relatively precise quantitative determination is possible. Latex agglutination inhibition reactions on slides are particularly suitable as rapid qualitative tests. In cases where the maximum attainable sensitivity of the agglutination inhibition tests is insufficient, e. g. for determining LH concentrations in urine, the hormone in the test fluid has to be concentrated or extracted. An alternative method is a modified haemagglutination inhibition test for large volumes which is applicable to unconcentrated urine. Due to non-specific inhibitions the above-mentioned tests cannot be applied to unprocessed serum. Agglutination inhibition tests with HCG are already well advanced, pregnancy diagnosis being their main application. Now that highly purified HCG is available, a satisfactory specificity for these tests can be attained. If the immune system for HCG is used for estimating LH, it has to meet additional specificity requirements. Furthermore, the measure of cross-reaction and the choice of standard merit special attention. Finally, a literature survey is given of test systems in which LH and FSH were used as antigens.

scholarly journals ON THE CALCULATION OF "TURNOVER TIME" AND "TURNOVER RATE" FROM EXPERIMENTS INVOLVING THE USE OF LABELING AGENTS

1943 ◽  
Vol 26 (3) ◽  
pp. 325-331 ◽  
Author(s):  
D. B. Zilversmit ◽  
C. Entenman ◽  
M. C. Fishler
Keyword(s):  
Quantitative Determination ◽  
Turnover Rate ◽  
Turnover Time ◽  
New Method ◽  
Animal Body

1. A new method for the determination of an immediate precursor of a substance occurring in the animal body is presented. 2. Calculations on the quantitative determination of the rate of turnover of a substance and their application to experiments involving the use of labeling agents are given. These calculations take into account loss of the isotopic substance by way of breakdown or transport.

scholarly journals Quantitative Determination of Pregnanes from Aerial Parts of Caralluma Species Using HPLC-UV and Identification by LC-ESI-TOF

2011 ◽  
Vol 94 (5) ◽  
pp. 1383-1390
Author(s):  
Bharathi Avula ◽  
Yatin J Shukla ◽  
Yan-Hong Wang ◽  
Ikhlas A Khan
Keyword(s):  
Quantitative Determination ◽  
Dietary Supplements ◽  
Hplc Method ◽  
Photodiode Array Detection ◽  
Plant Materials ◽  
Aerial Parts ◽  
Photodiode Array ◽  
Array Detection ◽  
Na Ions

Abstract An HPLC method was developed for the quantitative determination of five pregnane derivatives from aerial parts of Caralluma species and dietary supplements. The method was validated for linearity, repeatability, LOD, and LOQ. The LOD and LOQ of five pregnane compounds were found to be in the range of 1–5 and 3–15 μg/mL, respectively, by HPLC using photodiode array detection. This method was applied to the identification of three plant materials of Caralluma species (C. fimbriata, C. umbellate, and C. attentuata) and seven dietary supplements claiming to contain C. fimbriata. An LC/MS coupled with electrospray ionization interface method was used for the identification of compounds and involved the use of [M+Na]+ ions in the positive ion mode with extracted ion chromatogram.

scholarly journals A new method for quantitative determination of protein associated with crustacean chitin.

1987 ◽  
Vol 61 (4) ◽  
pp. 437-441 ◽  
Author(s):  
Yasuyuki TAKIGUCHI ◽  
Hiroshi YAMASHITA ◽  
Kazuhiro OHKOUCHI ◽  
Kenzo SHIMAHARA
Keyword(s):  
Quantitative Determination ◽  
New Method

scholarly journals A NEW METHOD FOR THE QUANTITATIVE DETERMINATION OF PROTEIN OF BACTERIAL ORIGIN ON THE BASIS OF D-ASPARTIC ACID AND D-GLUTAMIC ACID CONTENT

2001 ◽  
Vol 30 (1) ◽  
pp. 37-52 ◽  
Author(s):  
J. Csapó ◽  
J. Schmidt ◽  
Zs. Csapó-Kiss ◽  
G. Holló ◽  
I. Holló ◽  
...  
Keyword(s):  
Quantitative Determination ◽  
Glutamic Acid ◽  
Aspartic Acid ◽  
Acid Content ◽  
New Method ◽  
Bacterial Origin

scholarly journals Pharmacokinetics and Bioavailability Study of Monocrotaline in Mouse Blood by Ultra-Performance Liquid Chromatography-Tandem Mass Spectrometry

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Lianguo Chen ◽  
Bin Zhang ◽  
Jinlai Liu ◽  
Zhehua Fan ◽  
Ziwei Weng ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Tandem Mass Spectrometry ◽  
Quantitative Determination ◽  
Ultra Performance Liquid Chromatography ◽  
New Method ◽  
Tandem Mass ◽  
Mouse Blood ◽  
Detection Range

Background and Aims. The present study aimed to develop a simple and sensitive method for quantitative determination of monocrotaline (MCT) in mouse blood employing ultra-performance liquid chromatography-electrospray ionization tandem mass spectrometry (UPLC-ESI/MS/MS) using rhynchophylline as an internal standard. Methods. Proteins present in the blood samples were precipitated using acetonitrile. MCT was separated using a 1.7-μm ethylene bridged hybrid (BEH) C18 column (2.1 mm × 50 mm) with a gradient elution program and a constant flow rate of 0.4 mL/min. The LC mobile phase consisted of 10 mmol/L ammonium acetate (containing 0.1% formic acid) and acetonitrile. The total elution time was 4.0 min. The analytes were detected on a UPLC-ESI mass spectrometer in multiple reaction monitoring (MRM) mode and quantified. Results. The new method for the determination of MCT has a satisfactory linear detection range of 1-2000 ng/mL and excellent linearity (r = 0.9971). The lower limit of quantification (LLOQ) of MCT is 1.0 ng/mL. Intra- and interassay precisions of MCT were ≤13% with an accuracy from 96.2% to 106.6%. The average recovery of the new method was >75.0%, and matrix effects were between 89.0% and 94.3%. Based on the pharmacokinetics data, the bioavailability of MCT in mice was 88.3% after oral administration. Conclusions. The results suggest that the newly standardized method for quantitative determination of MCT in whole blood is fast, reliable, specific, sensitive, and suitable for pharmacokinetic studies of MCT after intravenous or intragastric administration.

A new method for the quantitative determination of zeolitic Brønsted acidity

1997 ◽  
pp. 383-384 ◽  
Author(s):  
Manfred Richter ◽  
Barbara Parlitz ◽  
Reinhard Eckelt ◽  
Rolf Fricke
Keyword(s):  
Quantitative Determination ◽  
New Method ◽  
Brønsted Acidity ◽  
Brönsted Acidity
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