scholarly journals Automatic flow system for sequential determination of ABTS+ scavenging capacity and Folin-Ciocalteu index: A comparative study in food products

2007 ◽  
Vol 592 (2) ◽  
pp. 193-201 ◽  
Author(s):  
Luís M. Magalhães ◽  
Marcela A. Segundo ◽  
Salette Reis ◽  
José L.F.C. Lima ◽  
Ildikó V. Tóth ◽  
...  
Keyword(s):  
Comparative Study ◽  
Flow System ◽  
Food Products ◽  
Sequential Determination ◽  
Scavenging Capacity

Kinetic-catalytic method for sequential determination of iron and copper using a chip coupled to a multipumping flow system

2015 ◽  
Vol 7 (18) ◽  
pp. 7858-7865 ◽  
Author(s):  
Fatima Zohra Abouhiat ◽  
Camelia Henríquez ◽  
Farida El Yousfi ◽  
Víctor Cerdà
Keyword(s):  
Flow System ◽  
Microfluidic System ◽  
Catalytic Method ◽  
Catalytic Determination ◽  
Sequential Determination ◽  
System P ◽  
Kinetic Catalytic Method

A microfluidic system for the kinetic-catalytic determination of iron and copper.

Polymer Enhancement of Automated Immunological Nephelometric Analysis, as Illustrated by Determination of Urinary Albumin

1974 ◽  
Vol 20 (4) ◽  
pp. 415-420 ◽  
Author(s):  
Jorge Lizana ◽  
Kristoffer Hellsing
Keyword(s):  
Polyethylene Glycol ◽  
Reaction Time ◽  
Comparative Study ◽  
Continuous Flow ◽  
Flow System ◽  
Urinary Albumin ◽  
Immunological Reaction ◽  
Enhancing Effect ◽  
Highly Sensitive

Abstract We have developed a new automated immunonephelometric method for determination of albumin in urine, by exploiting the polymer-enhancing effect on the immunological reaction. The original continuous-flow manifold has been simplified and the reaction time shortened to about 3 min. The antiserum was diluted 100-fold in a solution (100 g/liter) of polyethylene glycol (av mol wt, 6000) and mixed with the prediluted sample in the continuous-flow system. The method is highly sensitive and is unaffected by high blank and (or) high absorbance values of the specimens. Day-to-day variation was 3.8-4.3% (CV). Accuracy, as estimated from recovery experiments, was also good. A comparative study of 176 urines with the single radial immunodiffusion technique showed a correlation coefficient of 0.994. We therefore suggest the new method for routine use for determination of urinary albumin, because it is fast, accurate, precise, and sensitive, and requires only small amounts of antiserum.

scholarly journals Analytical Validation and Comparative Study of HPLC, Spectrophotometric and Titration Method for Determination of Benzoic Acid in Food Products

2017 ◽  
Vol 29 (7) ◽  
pp. 1565-1568
Author(s):  
Samarth I. Zarad ◽  
Nitin R. Nimkar ◽  
Kishor R. Desai ◽  
Maheshwari S. Solanki ◽  
Devang M. Gandhi ◽  
...  
Keyword(s):  
Benzoic Acid ◽  
Comparative Study ◽  
Food Products ◽  
Analytical Validation ◽  
Titration Method

Determination of quaternary ammonium compounds in food products by the method of ultra-performance liquid chromatography/high resolution mass-spectrometry

2020 ◽  
Vol 86 (8) ◽  
pp. 23-31
Author(s):  
V. G. Amelin ◽  
D. S. Bolshakov
Keyword(s):  
Mass Spectrometry ◽  
High Resolution ◽  
Quaternary Ammonium ◽  
High Resolution Mass Spectrometry ◽  
Food Products ◽  
Quaternary Ammonium Compounds ◽  
High Resolution Mass ◽  
Ammonium Compounds ◽  
Resolution Mass

The goal of the study is developing a methodology for determination of the residual amounts of quaternary ammonium compounds (QAC) in food products by UHPLC/high-resolution mass spectrometry after water-acetonitrile extraction of the determined components from the analyzed samples. The identification and determination of QAC was carried out on an «UltiMate 3000» ultra-high-performance liquid chromatograph (Thermo Scientific, USA) equipped with a «maXis 4G» high-resolution quadrupole-time-of-flight mass spectrometric detector and an ion spray «ionBooster» source (Bruker Daltonics, Germany). Samples of milk, cheese (upper cortical layer), dumplings, pork, chicken skin and ground beef were used as working samples. Optimal conditions are specified for chromatographic separation of the mixture of five QAC, two of them being a mixture of homologues with a linear structure (including isomeric forms). The identification of QAC is carried out by the retention time, exact mass of the ions, and coincidence of the mSigma isotopic distribution. The limits for QAC detection are 0.1 – 0.5 ng/ml, the determination limits are 1 ng/ml for aqueous standard solutions. The determinable content of QAC in food products ranges within 1 – 100 ng/g. The results of analysis revealed the residual amount of QAC present in all samples, which confirms data of numerous sources of information about active use of QAC-based disinfectants in the meat and dairy industry. The correctness of the obtained results is verified by introduction of the additives in food products at a level of 10 ng/g for each QAC. The relative standard deviation of the analysis results does not exceed 0.18. The duration of the analysis is 30 – 40 min.

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