Efficient preparation of caffeoylquinic acids from the flowers of Artemisia anomala by supramolecular solvent/equilibrium solution extraction followed by re-extraction

2021 ◽  
Vol 265 ◽  
pp. 118478
Author(s):  
Qin Li ◽  
Binjin Zhao ◽  
Jing Shi ◽  
Jianbo Chu ◽  
Xinyue Zhang ◽  
...  
Keyword(s):  
Equilibrium Solution ◽  
Caffeoylquinic Acids ◽  
Supramolecular Solvent

Caffeoylquinic Acids Rich versus Poor Fractions of Gynura procumbens: Their Comparative Antihyperlipidemic and Antioxidant Potential

2018 ◽  
Vol 18 (14) ◽  
pp. 1132-1140 ◽  
Author(s):  
Kisantini Murugesu ◽  
Vikneswaran Murugaiyah ◽  
Sultan A.M. Saghir ◽  
Mohd. Zaini Asmawi ◽  
Amirin Sadikun
Keyword(s):  
Antioxidant Potential ◽  
Caffeoylquinic Acids

Supramolecular Solvent Based Liquid-Liquid Microextraction for Preconcentration of Selected Fluoroquinolone Antibiotics in Environmental Water Sample Prior to High Performance Liquid Chromatographic Determination

2019 ◽  
Vol 15 (6) ◽  
pp. 607-615 ◽  
Author(s):  
Shirley K. Selahle ◽  
Philiswa N. Nomngongo
Keyword(s):  
High Performance ◽  
Chromatographic Determination ◽  
Decanoic Acid ◽  
Environmental Water ◽  
High Performance Liquid Chromatographic ◽  
Array Detector ◽  
Optimum Conditions ◽  
Limit Of Quantification ◽  
Supramolecular Solvent ◽  
Liquid Microextraction

Background and Objective: A rapid, simple and environmental friendly supramolecular solvent (SUPRAS) based liquid-liquid microextraction method for preconcentration of ciprofloxacin (CIPRO), danofloxacin (DANO) and enrofloxacin (ENRO) from wastewater was developed. Methods: This microextraction technique was coupled with high-performance liquid chromatography equipped with a diode array detector (HPLC-PDA) for detection and separation of the antibiotics. The SUPRAS composed of decanoic acid and tricaprylymethylammonium chloride. Optimum conditions for the extraction and preconcentration of all the antibiotics were obtained using surface response methodology (RSM) based on Box-Behnken design. Results: Under optimum conditions, the limits of detection (LOD) and limit of quantification (LOQ) ranged from 0.06-0.14 µg L−1 and 0.22-0.47 μg L−1, respectively with the preconcentration factors ranging from 153-241. The linear dynamic ranges were between LOQ and 850 µg L−1 with correlation coefficients ranging from 0.9928 to 0.9999. The intra-day (n = 15) and inter-day (n = 5) precisions (expressed in terms of %RSD) for 50 µg L−1 of CIPRO, DANO and ENRO were in the range of 3.3–4% and 4.1–5.8%, respectively. Conclusion: Lastly, the developed method was used for the extraction, preconcentration and quantification of selected CIPRO, DANO and ENRO in influent and effluent wastewater samples.

Binding of lead and copper(II) cations to hemicelluloses of rye bran

1986 ◽  
Vol 51 (10) ◽  
pp. 2250-2258 ◽  
Author(s):  
Rudolf Kohn ◽  
Zdena Hromádková ◽  
Anna Ebringerová
Keyword(s):  
Uronic Acid ◽  
Equilibrium Solution ◽  
Glucuronic Acid ◽  
The Other ◽  
Carboxyl Groups ◽  
Stoichiometric Ratio ◽  
Molar Ratios ◽  
Free Ions ◽  
Uronic Acid Content ◽  
The Relationship

Several fractions of acid hemicelluloses isolated from rye bran were characterized by molar ratios of saccharides (D-Xyl, L-Ara, D-Glc, D-Gal) and 4-O-methyl-D-glucuronic acid and protein content. Binding of Pb2+ and Cu2+ ions to these acid polysaccharides was considered according to function (M)b = f([M2+]f), expressing the relationship between the amount of metal (M)b bound to 1 g of the substance and the concentration of free ions [M2+]f in the equilibrium solution and according to the association degree β of these cations with carboxyl groups of uronic acid at a stoichiometric ratio of both components in the system under investigation. Acid hemicelluloses contained only a very small portion of uronic acid ((COOH) 0.05-0.18 mmol g-1); the model polysaccharide, 4-O-methyl-D-glucurono-D-xylan of beech, was substantially richer in uronic acid content ((COOH) 0.73 mmol g-1). Consequently, the amount of lead and copper bound to acid hemicelluloses is very small ((M)b 0.017-0.025 mmol g-1) at [M2+]f = 0.10 mmol l-1. On the other hand, much greater amount of cations ((M)f 0.09-0.10 mmol g-1) was bound to the glucuronoxylan. The association degree β was like with the majority of samples (β = 0.31-0.38). The amount of lead and copper(II) bound to acid hemicelluloses from rye bran is several times lower than that bound to dietary fiber isolated from vegetables (cabbage, carrot), rich in pectic substances.

scholarly journals Quantification of Major Bioactive Constituents, Antioxidant Activity, and Enzyme Inhibitory Effects of Whole Coffee Cherries (Coffea arabica) and Their Extracts

Molecules ◽  
2021 ◽  
Vol 26 (14) ◽  
pp. 4306
Author(s):  
Boris Nemzer ◽  
Diganta Kalita ◽  
Nebiyu Abshiru
Keyword(s):  
Antioxidant Activity ◽  
Coffea Arabica ◽  
Digestive Enzymes ◽  
Chlorogenic Acids ◽  
Inhibitory Effects ◽  
Bioactive Constituents ◽  
Caffeoylquinic Acids ◽  
Dicaffeoylquinic Acid ◽  
Ic50 Values ◽  
Control Of Diabetes

Coffee cherry is a rich source of chlorogenic acids (CGAs) and caffeine. In this study we examined the potential antioxidant activity and enzyme inhibitory effects of whole coffee cherries (WCC) and their two extracts on α-amylase, α-glucosidase and acetylcholinesterase (AChE) activities, which are targets for the control of diabetes and Alzheimer’s diseases. Whole coffee cherry extract 40% (WCCE1) is rich in chlorogenic acid compounds, consisting of a minimum of 40% major isomers, namely 3-caffeoylquinic acids, 4-caffeoylquinic acids, 5-caffeoylquinic acids, 3,4-dicaffeoylquinic acid, 3,5-dicaffeoylquinic acid, 4,5-dicaffeoylquinic acid, 4-feruloylquinc acid, and 5-feruloylquinc acid. Whole coffee cherry extract 70% (WCCE2) is rich in caffeine, with a minimum of 70%. WCCE1 inhibited the activities of digestive enzymes α-amylase and α-glucosidase, and WCCE2 inhibited acetylcholinesterase activities with their IC50 values of 1.74, 2.42, and 0.09 mg/mL, respectively. Multiple antioxidant assays—including DPPH, ABTS, FRAP, ORAC, HORAC, NORAC, and SORAC—demonstrated that WCCE1 has strong antioxidant activity.

scholarly journals An Insight into Kiwiberry Leaf Valorization: Phenolic Composition, Bioactivity and Health Benefits

Molecules ◽  
2021 ◽  
Vol 26 (8) ◽  
pp. 2314
Author(s):  
Ana Margarida Silva ◽  
Diana Pinto ◽  
Iva Fernandes ◽  
Victor de Freitas ◽  
María de la Luz Cádiz-Gurrea ◽  
...  
Keyword(s):  
Bioactive Compounds ◽  
Plant Material ◽  
Dry Weight ◽  
Alcoholic Extract ◽  
Phenolic Profile ◽  
Hydroalcoholic Extract ◽  
Caffeoylquinic Acids ◽  
Solar Exposure ◽  
Assisted Extraction ◽  
Phenolic And Flavonoid

During kiwiberry production, different by-products are generated, including leaves that are removed to increase the fruit’s solar exposure. The aim of this work was to extract bioactive compounds from kiwiberry leaf by employing microwave-assisted extraction (MAE). Compatible food solvents (water and ethanol) were employed. The alcoholic extract contained the highest phenolic and flavonoid contents (629.48 mg of gallic acid equivalents (GAE) per gram of plant material on dry weight (dw) (GAE/g dw) and 136.81 mg of catechin equivalents per gram of plant material on dw (CAE/g dw), respectively). Oppositely, the hydroalcoholic extract achieved the highest antioxidant activity and scavenging activity against reactive oxygen and nitrogen species (IC50 = 29.10 μg/mL for O2•−, IC50 = 1.87 μg/mL for HOCl and IC50 = 1.18 μg/mL for •NO). The phenolic profile showed the presence of caffeoylquinic acids, proanthocyanidin, and quercetin in all samples. However, caffeoylquinic acids and quercetin were detected in higher amounts in the alcoholic extract, while proanthocyanidins were prevalent in the hydroalcoholic extract. No adverse effects were observed on Caco-2 viability, while the highest concentration (1000 µg/mL) of hydroalcoholic and alcoholic extracts conducted to a decrease of HT29-MTX viability. These results highlight the MAE potentialities to extract bioactive compounds from kiwiberry leaf.

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