Photoacoustic Approach to Direct Determination of the Total Phenolic Content in Red Sorghum Flours

2004 ◽  
Vol 52 (8) ◽  
pp. 2133-2136 ◽  
Author(s):  
Otto Dóka ◽  
Dane D. Bicanic ◽  
Mamoudou H. Dicko ◽  
Maja A. Slingerland
Keyword(s):  
Total Phenolic Content ◽  
Phenolic Content ◽  
Direct Determination ◽  
Total Phenolic

scholarly journals Voltammetric determination of polyphenolic content in pomegranate juice using a poly(gallic acid)/multiwalled carbon nanotube modified electrode

2016 ◽  
Vol 7 ◽  
pp. 1104-1112 ◽  
Author(s):  
Refat Abdel-Hamid ◽  
Emad F Newair
Keyword(s):  
Carbon Nanotube ◽  
Gallic Acid ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Direct Determination ◽  
Multiwalled Carbon Nanotube ◽  
Pomegranate Juice ◽  
Total Phenolic ◽  
Multiwalled Carbon

A simple and sensitive poly(gallic acid)/multiwalled carbon nanotube modified glassy carbon electrode (PGA/MWCNT/GCE) electrochemical sensor was prepared for direct determination of the total phenolic content (TPC) as gallic acid equivalent. The GCE working electrode was electrochemically modified and characterized using scanning electron microscope (SEM), cyclic voltammetry (CV), chronoamperometry and chronocoulometry. It was found that gallic acid (GA) exhibits a superior electrochemical response on the PGA/MWCNT/GCE sensor in comparison with bare GCE. The results reveal that a PGA/MWCNT/GCE sensor can remarkably enhance the electro-oxidation signal of GA as well as shift the peak potentials towards less positive potential values. The dependence of peak current on accumulation potential, accumulation time and pH were investigated by square-wave voltammetry (SWV) to optimize the experimental conditions for the determination of GA. Using the optimized conditions, the sensor responded linearly to a GA concentration throughout the range of 4.97 × 10−6 to 3.38 × 10−5 M with a detection limit of 3.22 × 10−6 M (S/N = 3). The fabricated sensor shows good selectivity, stability, repeatability and (101%) recovery. The sensor was successfully utilized for the determination of total phenolic content in fresh pomegranate juice without interference of ascorbic acid, fructose, potassium nitrate and barbituric acid. The obtained data were compared with the standard Folin–Ciocalteu spectrophotometric results.

Novel determination of the total phenolic content in crude plant extracts by the use of 1H NMR of the –OH spectral region

2011 ◽  
Vol 688 (1) ◽  
pp. 54-60 ◽  
Author(s):  
A.A. Nerantzaki ◽  
C.G. Tsiafoulis ◽  
P. Charisiadis ◽  
V.G. Kontogianni ◽  
I.P. Gerothanassis
Keyword(s):  
1H Nmr ◽  
Plant Extracts ◽  
Spectral Region ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Total Phenolic

Determination of optimal extraction conditions for phenolic compounds from Pistacia atlantica leaves using the response surface methodology

2016 ◽  
Vol 8 (31) ◽  
pp. 6107-6114 ◽  
Author(s):  
Ziyad Ben Ahmed ◽  
Mohamed Yousfi ◽  
Johan Viaene ◽  
Bieke Dejaegher ◽  
Kristiaan Demeyer ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Phenolic Compounds ◽  
Response Surface ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Total Phenolic ◽  
Box Behnken Design ◽  
Pistacia Atlantica

Response surface methodology in combination with a Box–Behnken design was performed to optimize the extraction conditions, resulting in a maximum total phenolic content yield from Pistacia atlantica leaves.

Determination of Carotenoids, Total Phenolic Content, and Antioxidant Activity of Arazá (Eugenia stipitataMcVaugh), an Amazonian Fruit

2012 ◽  
Vol 60 (18) ◽  
pp. 4709-4717 ◽  
Author(s):  
G. Astrid Garzón ◽  
Carlos-Eduardo Narváez-Cuenca ◽  
Rachel E. Kopec ◽  
Andrew M. Barry ◽  
Kenneth M. Riedl ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Total Phenolic

scholarly journals Optimization of a New Methodology for Determination of Total Phenolic Content in Rice Employing Fast Blue BB and QUENCHER Procedure

2016 ◽  
Author(s):  
Sylvio V. Palombini ◽  
Thiago Claus ◽  
Swami A. Maruyama ◽  
Fabiana Carbonera ◽  
Paula F. Montanher ◽  
...  
Keyword(s):  
Total Phenolic Content ◽  
Phenolic Content ◽  
Total Phenolic ◽  
Fast Blue
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