scholarly journals Further studies on the adsorption of plant phenols by synthetic polymers

2014 ◽  
Vol 58 (4) ◽  
pp. 583-592 ◽  
Author(s):  
Akiyoshi Fukushima ◽  
Hiroaki Hase ◽  
Koshi Saito
Keyword(s):  
Chlorogenic Acid ◽  
Caffeic Acid ◽  
Average Rate ◽  
Synthetic Polymers ◽  
Buffer Solution ◽  
Phenol Adsorption ◽  
Plant Phenols ◽  
Amberlite Resins ◽  
Xad Resins

Pyrocatechol, catechol, caffeic acid, chlorogenic acid, safflor yellow A, safflor yellow B, precarthamin and carthamin were effectively adsorbed by insoluble polyvinyl-N-pyr­rolidone (PVP) in a neutral buffer solution. These eight phenols also bound with Amberlite XAD resins, however, the rate was found to be far less efficient than that of PVP. The average rate of the phenol binding was calculated as following order (%): PVP (42.7), Amberlite XAD-2 (16.6), Amberlite XAD-4 (10.1), Amberlite XAD-7 (13.0), Amberlite XAD-8 (17.7). No 3,4-dihydroxyphenylalanine was adsorbed by PVP, while the O-dihydroxylic acid could be removed by Amberlite XAD-4, XAD-7 and XAD-8. Data from using different weights of the test polymers showed that the rate of the phenol adsorption rose in proportion to each increasing amount of the adsorbents. PVP also admittedly maintained its predominent capacity for phenol binding over that of each member of the Amberlite resins.

scholarly journals Adsorption of plant phenols by polystyrene resins

2014 ◽  
Vol 56 (3) ◽  
pp. 485-497 ◽  
Author(s):  
Akiyoshi Fukushima ◽  
Hioaki Hase ◽  
Koshi Saito
Keyword(s):  
Synthetic Polymers ◽  
Model System ◽  
Experimental Conditions ◽  
Phenol Adsorption ◽  
Plant Phenols ◽  
Cation Exchangers ◽  
Phenolic Constituents ◽  
Different Types ◽  
Exchange Resins ◽  
Dowex 1

Adsorption of nine plant phenols by nine polystyrene ion-exchange resins was investigated in an experimental model system. The phenols were adsorbed by Amberlite CG-120 more efficiently than any other acidically charged resins tested in this study. They were also taken up by anion exchangers. Among them Dowex 1-X8 was found to show the strongest effect on the adsorption of the phenolic constituents applied. A comparison of the efficiency of plant phenol adsorption between two different types of the synthetic polymers revealed that the basically charged polystyrenes had more prefarable affinities for phenols than cation exchangers. For example, the ratio of the efficiency between Amberlite CG-120 and Dowex 1-X8 was roughly calculated to be 3:7 under the present experimental conditions. The adsorption rate of the test phenols was raised mostly by increasing the amount of the resins added, if they were mixed with effective polymers in the incubation model system.

scholarly journals Concentrations of Phenolic Acids Are Differently Genetically Determined in Leaves, Flowers, and Grain of Common Buckwheat (Fagopyrum esculentum Moench)

Plants ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 1142
Author(s):  
Alena Vollmannová ◽  
Janette Musilová ◽  
Judita Lidiková ◽  
Július Árvay ◽  
Marek Šnirc ◽  
...  
Keyword(s):  
Chlorogenic Acid ◽  
Caffeic Acid ◽  
Phenolic Acids ◽  
Sinapic Acid ◽  
Fagopyrum Esculentum ◽  
Blood Cholesterol ◽  
Common Buckwheat ◽  
High Concentration ◽  
Phenolic Substances ◽  
Fagopyrum Esculentum Moench

Common buckwheat (Fagopyrum esculentum Moench) is a valuable source of proteins, B vitamins, manganese, tryptophan, phytochemicals with an antioxidant effect, and the natural flavonoid rutin. Due to its composition, buckwheat supports the human immune system, regulates blood cholesterol, and is suitable for patients with diabetes or celiac disease. The study aimed to compare the allocation of selected phenolic acids (neochlorogenic acid, chlorogenic acid, trans-caffeic acid, trans-p-coumaric acid, trans-sinapic acid, trans-ferulic acid) and flavonoids (rutin, vitexin, quercetin, kaempferol) in the leaves, flowers, and grain of buckwheat cultivars of different origin. The content of individual phenolics was determined by the HPLC-DAD method. The results confirmed the determining role of cultivar on the relative content of chlorogenic acid, trans-caffeic acid, trans-sinapic acid, vitexin, and kaempferol in buckwheat plants. A significantly negative correlation among concentrations of phenolic acids in different common buckwheat plant parts shows that there are different mechanisms of genetic influences on the concentration of phenolic substances in common buckwheat flowers, leaves, and grain. These differences should be taken into account when breeding buckwheat for a high concentration of selected phenolic substances.

scholarly journals Microwave-Assisted Extraction of Phenolics from Hibiscus sabdariffa Flowers: Method Development and Validation

Proceedings ◽  
2020 ◽  
Vol 70 (1) ◽  
pp. 51
Author(s):  
Rohmah Nur Fathimah ◽  
Widiastuti Setyaningsih ◽  
Ceferino Carrera ◽  
Miguel Palma
Keyword(s):  
Phenolic Compounds ◽  
Chlorogenic Acid ◽  
Caffeic Acid ◽  
Solvent Composition ◽  
Positive Contribution ◽  
Hibiscus Sabdariffa ◽  
Microwave Assisted Extraction ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Development And Validation

Phenolics are bioactive compounds already reported in Hibiscus sabdariffa (roselle). The present study reports the development and validation of the analytical microwave-assisted extraction (MAE) method for the determination of phenolic compounds in roselle flowers to establish their positive contribution to human health. Prior to the optimization, a study for identifying phenolic compounds revealed that chlorogenic acid, protocatechuic acid, caffeic acid, and rutin were presented in Roselle. Three factors affecting MAE, viz. temperature, solvent composition, and sample to solvent ratio, were optimized employing a Box-Behnken Design (BBD) in conjunction with response surface methodology (RSM). The maximum extraction recovery was achieved using the extraction temperature of 68 °C, solvent composition of 59% MeOH in water, and 20:1 solvent to sample ratio. The kinetics experiment confirmed full recoveries (92–119%) at 15 min. Subsequently, method validation showed a satisfactory result, including low detection limits from 0.219 mg L−1 (caffeic acid) to 0.374 mg L−1 (chlorogenic acid). Both precisions and accuracy met the acceptances by AOAC. Finally, the method was successfully applied to quantify phenolics in the two most common varieties of Roselle. Chlorogenic acid was found as the main phenolic compound in both varieties

scholarly journals COMPARATIVE ANALYSIS OF MORPHOLOGY AND PHYTOCHEMICAL CONSTITUENTS IN DIFFERENT POPULATIONS AND MORPHOTYPES OF DATURA INNOXIA MILL. AND DATURA METEL L. FROM PUNJAB PLAINS

2019 ◽  
Vol 12 (1) ◽  
pp. 193 ◽  
Author(s):  
Mahinder Partap ◽  
Raghbir Chand Gupta ◽  
Saroj Kumar Pradhan
Keyword(s):  
Antioxidant Activity ◽  
Comparative Analysis ◽  
Chlorogenic Acid ◽  
Caffeic Acid ◽  
Health Benefit ◽  
Bioactive Metabolites ◽  
Datura Innoxia ◽  
Datura Metel ◽  
Different Populations ◽  
Phytochemical Constituents

Objective: Comparative analysis of morphology and phytochemical constituents in different populations and morphotypes of Datura innoxia Mill. and Datura metel L. from Punjab plains.Methods: Morphological analyses of different populations have been done. Methanol extracts of seeds and roots of different populations have been prepared and total phenols, flavonoid contents were measured through spectrophotometry. Antioxidant activity was studied by 2, 2-diphenyl-1- picrylhydrazyl radical scavenging activity and total antioxidant capacity. Two major compounds, caffeic acid and chlorogenic acid were quantified by high-performance thin-layer chromatography (HPTLC) analyses.Results: Two morphotypes of D. metel were reported in the present study. Out of five different populations of D. metel and D. innoxia, the wild populations have more bioactive compound as compared to the cultivated ones from the detailed phytochemical investigation. Pharmacologically important two marker compounds chlorogenic acid and caffeic acid has been identified and quantified by HPTLC technique.Conclusion: Variation in terms of morphology and secondary metabolites exists among the different populations of Datura spp. Among the two plant parts studied, seeds have the maximum amount of bioactive metabolites and antioxidant activity. This study revealed that chlorogenic acid and caffeic acid are the potential polyphenolic compounds in Datura spp. It has been found that the antioxidant activity of plant is due to its polyphenol contents, which provides insight to various researchers to work on it as it imparts health benefit.

scholarly journals Anti-diabetes Constituents in Leaves of Smallanthus sonchifolius

2010 ◽  
Vol 5 (1) ◽  
pp. 1934578X1000500 ◽  
Author(s):  
Xiang Zheng ◽  
He Fan ◽  
Kang Ting-Guo ◽  
Dou De-Qiang ◽  
Gai Kuo ◽  
...  
Keyword(s):  
Quality Control ◽  
Chlorogenic Acid ◽  
Caffeic Acid ◽  
Analytical Method ◽  
Inhibitory Effect ◽  
Hplc Method ◽  
Smallanthus Sonchifolius ◽  
Rp Hplc

The inhibitory effect of smallanthaditerpenic acids A, B, C and D previously isolated from leaves of Smallanthus sonchifolius (yacon) on α-glucosidase were examined and their IC50 were determined to be 0.48 mg/mL, 0.59 mg/mL, 1.00 mg/mL, and 1.17 mg/mL respectively. In addition, a rapid, reliable RP-HPLC method for the analysis of chlorogenic acid, caffeic acid, and smallanthaditerpenic acids A and C in yacon leaves was established, and the variation in their contents in leaves from plants cultivated in different places and collected at different times of the year were compared. The established analytical method for determining smallanthaditerpenic acids A and C, chlorogenic acid and caffeic acid presented good results and could be used as a method for the quality control of S. sonchifolius leaves.

scholarly journals Relevance and Standardization of In Vitro Antioxidant Assays: ABTS, DPPH, and Folin–Ciocalteu

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Helena Abramovič ◽  
Blaž Grobin ◽  
Nataša Poklar Ulrih ◽  
Blaž Cigić
Keyword(s):  
Ascorbic Acid ◽  
Chlorogenic Acid ◽  
Gallic Acid ◽  
Caffeic Acid ◽  
Sulfonic Acid ◽  
Epigallocatechin Gallate ◽  
The Other ◽  
Oh Groups ◽  
Standard Compound

Trolox, gallic acid, chlorogenic acid, caffeic acid, catechin, epigallocatechin gallate, and ascorbic acid are antioxidants used as standards for reaction with chromogenic radicals, 2,2-diphenyl-1-picrylhydrazyl (DPPH⋅) and 2,2′-azino-bis-3-ethylbenzotiazolin-6-sulfonic acid (ABTS⋅+), and Folin–Ciocalteu (FC) reagent. The number of exchanged electrons has been analyzed as function of method and solvent. A majority of compounds exchange more electrons in FC assay than in ABTS and DPPH assays. In reaction with chromogenic radicals, the largest number of electrons was exchanged in buffer (pH 7.4) and the lowest reactivity was in methanol (DPPH) and water (ABTS). At physiological pH, the number of exchanged electrons of polyphenols exceeded the number of OH groups, pointing to the important contribution of partially oxidized antioxidants, formed in the course of reaction, to the antioxidant potential. For Trolox, small impact on the number of exchanged electrons was observed, confirming that it is more suitable as a standard compound than the other antioxidants.

Structure of Green Pigment Formed by the Reaction of Caffeic Acid Esters (or Chlorogenic acid) with a Primary Amino Compound

2001 ◽  
Vol 65 (10) ◽  
pp. 2121-2130 ◽  
Author(s):  
Goro YABUTA ◽  
Yukimichi KOIZUMI ◽  
Kazuko NAMIKI ◽  
Mitsuhiko HIDA ◽  
Mitsuo NAMIKI
Keyword(s):  
Chlorogenic Acid ◽  
Caffeic Acid ◽  
Amino Compound ◽  
Green Pigment ◽  
Primary Amino ◽  
Caffeic Acid Esters ◽  
Acid Esters

Caffeoyl Quinic and Tartaric Acids and Flavonoids from Lapsana communis L. subsp. communis (Asteraceae)

1998 ◽  
Vol 53 (11-12) ◽  
pp. 1090-1092 ◽  
Author(s):  
D. Fontanel ◽  
C. Galtier ◽  
C. Viel ◽  
A. Gueiffier
Keyword(s):  
Chlorogenic Acid ◽  
Caffeic Acid ◽  
Hydroxycinnamic Acids ◽  
First Report ◽  
Chicoric Acid ◽  
Caftaric Acid ◽  
Aerial Parts ◽  
Tartaric Acids ◽  
Dicaffeoylquinic Acid

Abstract Six hydroxycinnamic acids : caffeic acid, chlorogenic acid, 3,5-O-dicaffeoylquinic acid 2-O-caffeoyltartaric acid (caftaric acid) and 2,3-O-dicaffeoyltartaric acid (chicoric acid) have been isolated from Lapsana communis L. subsp. communis aerial parts. Among flavonoids, only isoquercitrin, luteolin and luteolin-7-O-β-glucuronide were identified. Except for chlorogenic acid, these com­ pounds represent the first report in Lapsana communis. Chicoric acid is the major phenylpropanoic constituent in this plant.

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