Cupric Ferricyanide Reaction in Solution for Determination of Reducing Properties of Plant Antioxidants

2015 ◽  
Vol 9 (1) ◽  
pp. 164-177 ◽  
Author(s):  
Jaan Klõšeiko
Keyword(s):  
Plant Antioxidants ◽  
Reaction In Solution ◽  
Reducing Properties

Determination of amines by using a chemiluminescent reaction in solution

Talanta ◽  
1979 ◽  
Vol 26 (9) ◽  
pp. 795-798 ◽  
Author(s):  
J.L. Burguera ◽  
Alan Townshend®
Keyword(s):  
Chemiluminescent Reaction ◽  
Reaction In Solution

Spectrophotometric determination of cyanide ions through ligand exchange reaction in solution

1979 ◽  
Vol 71 (5-6) ◽  
pp. 445-451 ◽  
Author(s):  
Yashbir S. Verma ◽  
Ishwar Singh ◽  
B. S. Garg ◽  
R. P. Singh
Keyword(s):  
Exchange Reaction ◽  
Spectrophotometric Determination ◽  
Ligand Exchange ◽  
Ligand Exchange Reaction ◽  
Reaction In Solution

scholarly journals Comparison of pressurised fluid and ultrasonic extraction methods for analysis of plant antioxidants and their antioxidant capacity

2010 ◽  
Vol 8 (1) ◽  
pp. 87-95 ◽  
Author(s):  
Petr Dobiáš ◽  
Petra Pavlíková ◽  
Martin Adam ◽  
Aleš Eisner ◽  
Blanka Beňová ◽  
...  
Keyword(s):  
Antioxidant Capacity ◽  
Plant Material ◽  
High Performance ◽  
Extraction Methods ◽  
Ultrasonic Extraction ◽  
Dpph Radical ◽  
Limit Of Quantification ◽  
Plant Antioxidants ◽  
Real Plant

AbstractThe analytical method based on the high-performance liquid chromatography coupled with UV detection (HPLC/UV) for determination of selected antioxidants (i.e., esculetin, scopoletin, 7-hydroxycoumarine, rutin, xanthotoxin, 5-methoxypsoralen and quercetin) in plant material was developed. Pressurised fluid extraction (PFE) and ultrasonic extraction (USE) methods for the isolation of these compounds from ten real plant samples were used. Both extraction methods were optimised and compared to each other. For the proposed HPLC/UV method the LOQ values (limit of quantification) in the range from 22.7 (xanthotoxin) to 97.2 ng mL−1 (rutin) were obtained. For all extracts the antioxidant capacity based on the reduction of free 2,2-diphenyl-1-picrylhydrazyl radical (DPPH) was also determined. Results ranged from 82.04 to 94.43% of DPPH radical inhibition for PFE method and from 76.01 to 89.94% in the case of USE method.

An Automated Micromethod for Determination of Serum Glucose, with an Improved o-Toluidine Reagent

1970 ◽  
Vol 16 (4) ◽  
pp. 285-290 ◽  
Author(s):  
Wells R Moorehead ◽  
Edward A Sasse
Keyword(s):  
Life Expectancy ◽  
Polyvinyl Chloride ◽  
Coefficient Of Variation ◽  
Serum Glucose ◽  
Automated Method ◽  
Beer's Law ◽  
Beer’S Law ◽  
Manual Methods ◽  
Reducing Properties

Abstract An automated method has been developed in which a new o-toluidine reagent is used for the microanalysis of glucose. The reagent is 1.3 times as sensitive as the o-toluidine reagent commonly used in manual procedures. The reagent does not significantly alter the life expectancy of manifold tubing made of polyvinyl chloride. The automation includes a dialysis step and possesses the desirable features of the manual methods, including the greater specificity as compared with methods based on reducing properties. Results of this automated method obey Beer’s law, are very reproducible (the coefficient of variation is approximately 1.5%), and are not significantly different from those obtained manually. The method requires 75 µl of sample.

Synthesis of Ag-Au/Reduced Graphene Oxide/TiO2 Nanocomposites: Application as a Non-enzymatic Amperometric H2O2 Sensor

2020 ◽  
Vol 16 (4) ◽  
pp. 485-492
Author(s):  
Long Han ◽  
Shoufang Cui ◽  
Dongmei Deng ◽  
Yuanyuan Li ◽  
Xiaoxia Yan ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Practical Significance ◽  
Quantitative Detection ◽  
Reduction Peak ◽  
Transmission Electron ◽  
H2o2 Detection ◽  
Reduced Graphene ◽  
Aseptic Packaging ◽  
Reducing Properties

Background: Owing to the strong oxidizing and reducing properties of hydrogen peroxide (H2O2), it has been widely used in many fields. In particular, H2O2 is widely used in the aseptic packaging of drinks and milk. The residue of H2O2 in food is harmful to human health. Therefore, the quantitative detection of H2O2 is of great practical significance. Methods: The Ag-Au/RGO/TiO2 nanocomposites were facilely synthesized by photo-reduction approach. Transmission electron microscopy, X-ray photoelectron spectroscopy and Raman spectroscopy were used to characterize the synthesized Ag-Au/RGO/TiO2 nanocomposites. Cyclic voltammetry was used to analyze the electrochemical behavior of H2O2 on the Ag-Au/RGO/TiO2/GCE. Amperometry was applied for quantitative determination of the concentration of H2O2. Results: A novel Ag-Au/RGO/TiO2/GCE was prepared. The Ag-Au/RGO/TiO2/GCE displayed high electrocatalytic activity towards H2O2 reduction. An electrochemical reduction peak of H2O2 was achieved on the Ag-Au/RGO/TiO2/GCE. The current responses were linear with the concentrations of H2O2 in the range of 0.01-30 mM with the detection limit of 3.0 μM (S/N = 3). Conclusion: An amperometric sensor has been prepared for H2O2 detection using Ag- Au/RGO/TiO2/GCE. The Ag-Au/RGO/TiO2/GCE shows good performance for the determination of H2O2. The proposed sensor exhibits good selectivity and stability.

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