Application of direct-injection detector integrated with the multi-pumping flow system to chemiluminescence determination of the total polyphenol index

2016 ◽  
Vol 911 ◽  
pp. 82-91 ◽  
Author(s):  
Edyta Nalewajko-Sieliwoniuk ◽  
Magdalena Iwanowicz ◽  
Sławomir Kalinowski ◽  
Anatol Kojło
Keyword(s):  
Flow System ◽  
Direct Injection ◽  
Total Polyphenol

scholarly journals Novel approach to determination of Fe(II) using a flow system with direct-injection detector

2020 ◽  
Vol 151 (8) ◽  
pp. 1305-1310
Author(s):  
Justyna Paluch ◽  
Paweł Kościelniak ◽  
Iwona Molęda ◽  
Karol Machowski ◽  
Sławomir Kalinowski ◽  
...  
Keyword(s):  
Flow System ◽  
Direct Injection ◽  
Novel Approach

An automatic chemiluminescence method based on the multi-pumping flow system coupled with the fluidized reactor and direct-injection detector: Determination of uric acid in saliva samples

Talanta ◽  
2017 ◽  
Vol 167 ◽  
pp. 725-732 ◽  
Author(s):  
Christina Vakh ◽  
Stanislawa Koronkiewicz ◽  
Slawomir Kalinowski ◽  
Leonid Moskvin ◽  
Andrey Bulatov
Keyword(s):  
Uric Acid ◽  
Flow System ◽  
Direct Injection ◽  
Chemiluminescence Method

scholarly journals Photometric Determination of Iron in Pharmaceutical Formulations Using Double-Beam Direct Injection Flow Detector

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4498
Author(s):  
Stanislawa Koronkiewicz
Keyword(s):  
Flow System ◽  
Limit Of Detection ◽  
Direct Injection ◽  
Pharmaceutical Products ◽  
Complexing Agent ◽  
Photometric Detection ◽  
Relative Standard ◽  
Double Beam ◽  
Log Ratio

In this work, an innovative, flow-through, double-beam, photometric detector with direct injection of the reagents (double-DID) was used for the first time for the determination of iron in pharmaceuticals. For stable measurement of the absorbance, double paired emission-detection LED diodes and a log ratio precision amplifier have been applied. The detector was integrated with the system of solenoid micro-pumps. The micro-pumps helped to reduce the number of reagents used and are responsible for precise solution dispensing and propelling. The flow system is characterized by a high level of automation. The total iron was determined as a Fe(II) with photometric detection using 1,10-phenanthroline as a complexing agent. The optimum conditions of the propose analytical procedure were established and the method was validated. The calibration graph was linear in the range of 1 to 30 mg L−1. The limit of detection (LOD) was 0.5 mg L−1. The throughput of the method was 90 samples/hour. The repeatability of the method expressed as the relative standard deviation (R.S.D.) was 2% (n = 10). The method was characterized by very low consumption of reagents and samples (20 μL each) and a small amount of waste produced (about 540 µL per analysis). The proposed flow method was successfully applied for determination of iron in pharmaceutical products. The results were in good agreement with those obtained using the manual UV-Vis spectrophotometry and with values claimed by the manufacturers. The flow system worked very stably and was insensitive to bubbles appearing in the system.

Simultaneous and Sensitive Determination of Amphetamine, Codeine and Morphine in Exhaled Breath Condensate, Using Capillary Electrophoresis Coupled with On-line and Off-line Enhancing Methods

2020 ◽  
Vol 16 (7) ◽  
pp. 872-879
Author(s):  
Samin Hamidi
Keyword(s):  
Drugs Of Abuse ◽  
Exhaled Breath Condensate ◽  
Direct Injection ◽  
Forensic Toxicology ◽  
Analytical Signal ◽  
Exhaled Breath ◽  
Concentration Method ◽  
Validation Parameters ◽  
Breath Condensate

Background: Abuse of drugs is associated with several medical, forensic, toxicology and social challenges. “Drugs of abuse” testing is therefore an important issue. Objective: We propose a simple CE-based method for the quantification of amphetamine, codeine and morphine after direct injection of Exhaled Breath Condensate (EBC) by the aid of simple stacking mode and an off-line pre-concentration method. Methods: Using graphene oxide adsorbents, amphetamine, codeine and morphine were extracted from EBC in order to eliminate the proteins and other interferences. In addition to off-line method, an online stacking mode was applied to improve the analytical signal obtained from the instrument. Results: The validation parameters were experimented on the developed method based on the FDA guideline over concentration ranges of 12.5-100, 30-500 and 10-1250 ng/mL associated with amphetamine, codeine and morphine, respectively. Small volumes (around 100 μL) of EBC were collected using a lab-made setup and successfully analyzed using the proposed method where precisions and accuracies (within day and between days) were in accordance with the guideline (recommended less than 15 % for biological samples). The recovery tests were used to evaluate the matrix effect and data (94 to 105 %) showed that the proposed method can be applied in different EBC matrix samplings of subjects. Conclusion: The proposed method is superior for simultaneous determination of amphetamine, codeine and morphine over chromatographic analyses because it is fast and consumes fewer chemicals, with no derivatization step.

scholarly journals Fast and Reliable Multiresidue Analysis of Aromas in Wine by Means of Gas Chromatography Coupled with Triple Quadrupole Mass Spectrometry

Analytica ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 38-49
Author(s):  
Ettore Guerriero ◽  
Massimo Iorizzo ◽  
Marina Cerasa ◽  
Ivan Notardonato ◽  
Bruno Testa ◽  
...  
Keyword(s):  
Direct Injection ◽  
Headspace Analysis ◽  
White Wine ◽  
Quadrupole Mass ◽  
Multiresidue Analysis ◽  
Liquid Liquid Extraction ◽  
Volatile Organic ◽  
Steel Tank ◽  
First Time

The paper would like to show a direct injection into GC-MS/QqQ for the determination of secondary aromas in white wine samples fermented in two different ways. The procedure has been compared with more traditional methods used in this field, i.e., headspace analysis and liquid–liquid extraction. The application of such direct injection, for the first time in the literature, allows us to analyze Volatile Organic Compounds (VOCs) in the range 0.1–100 µg mL−1, with Limits of Detection (LODs) and Limits of Quantification (LOQs) between 0.01–0.05 µg mL−1 and 0.03–0.09 µg mL−1, respectively, intraday and interday below 5.6% and 8.5%, respectively, and recoveries above 92% at two different fortification levels. The procedure has been applied to real wine samples: it evidences how the fermentation in wood (cherry) barrel yields higher VOC levels than ones in wine fermented in steel tank, causing production of different secondary aromas and different relative flavors.

Determination of fast ozone oxidation rate for textile dyes by using a continuous quench-flow system

2010 ◽  
Vol 178 (1-3) ◽  
pp. 57-65 ◽  
Author(s):  
Arlindo C. Gomes ◽  
José C. Nunes ◽  
Rogério M.S. Simões
Keyword(s):  
Oxidation Rate ◽  
Flow System ◽  
Textile Dyes ◽  
Ozone Oxidation

scholarly journals Multi-pumping flow system for the determination of dissolved orthophosphate and dissolved organic phosphorus in wastewater samples

2006 ◽  
Vol 572 (1) ◽  
pp. 148-154 ◽  
Author(s):  
Carmen Pons ◽  
Ildikó V. Tóth ◽  
António O.S.S. Rangel ◽  
Rafael Forteza ◽  
Víctor Cerdà
Keyword(s):  
Flow System ◽  
Organic Phosphorus ◽  
Dissolved Organic Phosphorus ◽  
Wastewater Samples
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