ABSTRACT
Cyanidin-3-O-galactoside (Cy3-gal) is the most widespread anthocyanin that has been found to be applicable to nutraceutical and pharmaceutical ingredients. Nevertheless, the process of separation and purification, susceptibilities to heat, and pH inactivation present some limitations. In the present study, natural deep eutectic solvents (NADES) with an ultrasonic-assisted extraction method were briefly studied, and the recovery of Cy3-gal from Rhododendron arboreum was highlighted. The NADES, consisting of choline chloride and oxalic acid (1:1), was screened out as an extractant, and single-factor experiments combined with a two-site kinetic model were employed to describe the extraction process. Further, the work investigated ultrasound-assisted adsorption/desorption to efficiently purify Cy3-gal using macroporous resins. The optimal extraction conditions to attain maximum Cy3-gal yield was 30% water in a 50:1 (mL/g) solvent-to-sample ratio, 11.25 W/cm3 acoustic density, and 50% duty cycle for 16 min of extraction time. Under these conditions, the results revealed 23.07 ± 0.14 mg/g of Cy3-gal, two-fold higher than the traditional solvents. Furthermore, of the different resins used, Amberlite XAD-7HP showed significantly (p < 0.05) higher adsorption/desorption capacities (12.82 ± 0.18 mg/g and 10.97 ± 0.173 mg/g) and recovery (48.41 ± 0.76%) percent over other adsorbents. Experiments on the degrading behavior (40-80 °C) of the recovered Cy3-gal were performed over time, and the first-order kinetic model better explained the obtained data. In conclusion, the study asserts the use of ultrasonication with NADES and XAD-7HP resin for the improved purification of Cy3-gal from the crude extract.
Subject(s)
Anthocyanins , Plant Extracts , Rhododendron , Thermodynamics , Kinetics , Anthocyanins/chemistry , Anthocyanins/isolation & purification , Rhododendron/chemistry , Plant Extracts/chemistry , Plant Extracts/isolation & purification , Deep Eutectic Solvents/chemistry , Galactosides/chemistry , Galactosides/isolation & purification , Adsorption , Chemical Fractionation/methodsABSTRACT
Obesity is a chronic disease that has been causing serious problems all over the world. However, there is a lack of available therapeutic approaches to treat obesity. The FDA-approved drug orlistat has severe side effects, such as abdominal pain, flatulence and oily stool. As the therapeutic target of orlistat is pancreatic lipase, there is an urgent need for discovery of new pancreatic lipase inhibitors from natural sources that have reduced side effects compared with orlistat. In this study, ultrafiltration in combination with molecular simulation and spectroscopy was reported as an effective approach for identifying new pancreatic lipase inhibitors from anthocyanin-rich berry sources. Using this approach, four monomeric anthocyanins cyanidin-3-O-arabinoside (C3A), cyanidin-3-O-galactoside (C3Ga), peonidin-3-O-arabinoside (Pn3A) and peonidin-3-O-galactoside (Pn3Ga) from cranberries were discovered as potent pancreatic lipase inhibitors. These four cranberry anthocyanins were shown to form hydrophobic interactions and hydrogen bonds with pocket amino acid residues in molecular docking and molecular dynamics simulations. C3A showed greater impact on secondary structures of the enzyme and showed higher binding capacity with the enzyme compared with C3Ga, Pn3A and Pn3Ga as observed by CD and fluorescence spectroscopy. The structure-activity relationships were then investigated and summarized as both the structures of the B ring and glycosyl group were related to the inhibitory activities of anthocyanins. In short, our results suggested that cranberry anthocyanins could be developed as food supplements to facilitate the prevention and treatment of obesity.
Subject(s)
Anthocyanins/pharmacology , Enzyme Inhibitors/pharmacology , Lipase/antagonists & inhibitors , Pancreas/enzymology , Plant Extracts/chemistry , Vaccinium macrocarpon/chemistry , Animals , Anthocyanins/chemistry , Anthocyanins/isolation & purification , Circular Dichroism , Dietary Supplements , Enzyme Inhibitors/chemistry , Enzyme Inhibitors/isolation & purification , Fruit/chemistry , Galactosides/chemistry , Galactosides/isolation & purification , Galactosides/pharmacology , Lipase/chemistry , Lipase/metabolism , Models, Molecular , Molecular Docking Simulation , Molecular Dynamics Simulation , Structure-Activity Relationship , Swine , UltrafiltrationABSTRACT
: Aronia melanocarpa are a rich source of anthocyanins that have received considerable interest for their relations to human health. In this study, the anti-adipogenic effect of cyanidin-3-O-galactoside-enriched Aronia melanocarpa extract (AM-Ex) and its underlying mechanisms were investigated in an in vivo system. Five-week-old male C57BL/6N mice were randomly divided into five groups for 8-week feeding with a control diet (CD), a high-fat diet (HFD), or a HFD with 50 (AM-Ex 50), 100 (AM-Ex 100), or 200 AM-Ex (AM-Ex 200) mg/kg body weight/day. HFD-fed mice showed a significant increase in body weight compared to the CD group, and AM-Ex dose-dependently inhibited this weight gain. AM-Ex significantly reduced the food intake and the weight of white fat tissue, including epididymal fat, retroperitoneal fat, mesenteric fat, and inguinal fat. Treatment with AM-Ex (50 to 200 mg/kg) reduced serum levels of leptin, insulin, triglyceride, total cholesterol, and low density lipoprotein (LDL)-cholesterol. Real-time reverse transcription-polymerase chain reaction (RT-PCR) analysis revealed that AM-Ex suppressed adipogenesis by decreasing CCAAT/enhancer binding protein , peroxisome proliferator-activated receptor , sterol regulatory element-binding protein-1c, peroxisome proliferator-activated receptor gamma coactivator-1, acetyl-CoA carboxylase 1, ATP-citrate lyase, fatty acid synthase, and adipocyte protein 2 messenger RNA (mRNA) expressions. These results suggest that AM-Ex is potentially beneficial for the suppression of HFD-induced obesity by modulating multiple pathways associated with adipogenesis and food intake.
Subject(s)
Adipogenesis/drug effects , Adipose Tissue, White/drug effects , Anthocyanins/pharmacology , Anti-Obesity Agents/pharmacology , Diet, High-Fat , Galactosides/pharmacology , Obesity/drug therapy , Photinia , Plant Extracts/pharmacology , Weight Gain/drug effects , Adipogenesis/genetics , Adipose Tissue, White/metabolism , Adipose Tissue, White/physiopathology , Animals , Anthocyanins/isolation & purification , Anti-Obesity Agents/isolation & purification , Disease Models, Animal , Galactosides/isolation & purification , Gene Expression Regulation , Mice, Inbred C57BL , Obesity/genetics , Obesity/metabolism , Obesity/physiopathology , Photinia/chemistry , Plant Extracts/isolation & purification , Signal TransductionABSTRACT
An improved, reliable and comprehensive method for assessing the quality of the ethyl acetate extract from persimmon leaves (EAPL) and its commercial preparation, Naoxinqing (Brain and Heart Clear capsules), has been developed and validated. Based on HPLC-DAD-ESI-Q-TOF-MS analysis, myricetin-3-O-ß-D-galactoside (1), myricetin-3-O-glucoside (2), quercetin-3-O-ß-D-galactoside (3), quercetin-3-O-ß-D-glucoside (4), quercetin-3-O-(2â³-O-galloyl-ß-D-galactoside) (5), quercetin-3-O-(2â³-O-galloyl-ß-D-glucoside) (6), kaempferol-3-O-ß-D-galactoside (7), kaempferol-3-O-ß-D-glucoside (8), kaempferol-3-O-(2â³-O-galloyl-ß-D-galactoside) (9), kaempferol-3-O-(2â³-O-galloyl-ß-D-glucoside) (10), quercetin (11) and kaempferol (12) were identified from 15 batch samples. A HPLC fingerprint analytical method was established. All compounds, with the exception of compound 2, were simultaneously quantified by the single standard to determine multi-components (SSDMC) method, using kaempferol-3-O-ß-D-glucoside as the internal standard. The rate of analysis was found to be faster with the SSDMC method than with current acid hydrolysis method (Pharmacopoeia of the People's Republic of China 2015 edition) and the results were more intuitive and reliable. Three-dimensional principal component analysis revealed that there were similar characteristics in persimmon leaf from same district. Analysis of the myocardial cell protection activity of 11 monomeric compounds showed that compounds 12, 11 and 10 were the main active ingredients that produce pharmacologic functions in EAPL. Among these compounds, the bioactive constituent of myricetin-3-O-ß-D-galactoside was determined for the first time in Diospyros khaki. Thus, we have established an effective assessment method that can be applied to the comprehensive quality evaluation of EAPL extract and Naoxinqing capsule.
Subject(s)
Cardiotonic Agents/isolation & purification , Diospyros/chemistry , Flavonoids/isolation & purification , Myocytes, Cardiac/drug effects , Plant Extracts/pharmacology , Animals , Cell Line , China , Chromatography, High Pressure Liquid/methods , Drug Evaluation, Preclinical , Flavonoids/pharmacology , Fruit/chemistry , Galactosides/isolation & purification , Glucosides/isolation & purification , Kaempferols/isolation & purification , Mice , Myocardium , Phytotherapy , Plant Leaves/chemistry , Principal Component Analysis , Quercetin/analogs & derivativesABSTRACT
The impact of glycosylation on anthocyanin stability has largely been associated with sugar type, site, and size, with glycosyl stereochemistry being under-explored. Seven cyanidin-3-glycosides were isolated by HPLC, diluted in pH 1-9, mixed with bisulfite or ascorbic acid at pH 3, and stored for 8â¯weeks (25⯰C, dark). Spectral changes, half-lives, and bleaching rates were determined. Cyanidin-3-galactoside was more reactive (susceptible to hydration and bleaching) than cyanidin-3-glucoside. The 1â¯ââ¯2 disaccharides exhibited greater λvis-max (≤16â¯nm), resistance to hydration, and bleaching compared to 1â¯ââ¯6 disaccharides.The 1â¯ââ¯6 disaccharides had similar λvis-max (â¼2â¯nm) to the monosaccharides but slightly improved resistance to hydration and bleaching. The tri-glycosylated anthocyanin had the greatest stability and its spectral and bleaching characteristics was intermediate to 1â¯ââ¯2 and 1â¯ââ¯6 disaccharides. The 1â¯ââ¯2 disaccharides generally exhibited lower half-lives compared to monosaccharides; whereas, 1â¯ââ¯6 disaccharides exhibited higher stability. These findings highlight the role of glycosyl assembly on anthocyanin reactivity and stability.
Subject(s)
Anthocyanins/chemistry , Galactosides/chemistry , Glycosides/chemistry , Anthocyanins/isolation & purification , Anthocyanins/metabolism , Ascorbic Acid/chemistry , Chromatography, High Pressure Liquid , Galactosides/isolation & purification , Galactosides/metabolism , Glycosides/isolation & purification , Glycosides/metabolism , Glycosylation , Half-Life , Hydrogen-Ion Concentration , Morus/chemistry , Morus/metabolism , Sulfites/chemistryABSTRACT
As a continuation of investigating Impatiens L. genus, eight flavonoids, eriodyctiol, eriodyctiol 7-O-ß-á´ -glucoside, kaempferol 3-O-ß-á´ -glucoside, kaempferol 3-O-ß-á´ -galactoside, kaempferol 3-rhamnosyl-di-glucoside, kaempferol 3-O-ß-á´ -rutinoside, quercetin 3-O-ß-á´ -glucoside and quercetin 3-O-ß-á´ -galactoside, two phenolic acids - p-hydroxybenzoic acid and protocatechuic acid, and 2-methoxynaphthalene-1,4-dione were isolated from the aerial parts of I. glandulifera collected in Poland. The structures of the compounds were established by analysis of their spectroscopic (1H and 13C NMR) and spectrometric (MS) data, as well as by comparison of these with those reported in the literature. Quercetin 3-O-ß-á´ -glucoside, kaempferol 3-O-ß-á´ -galactoside and kaempferol 3-O-ß-á´ -rutinoside were isolated for the first time from the investigated taxon. In addition, the antioxidant activities in different tests of all obtained compounds were evaluated. The results clearly showed that among analyzed constituents, quercetin 3-O-ß-á´ -glucoside exhibited antioxidant activity comparable or better than ascorbic acid and Trolox which were used as a positive control.
Subject(s)
Antioxidants/chemistry , Antioxidants/pharmacology , Impatiens/chemistry , Plant Components, Aerial/chemistry , Antioxidants/isolation & purification , Flavonoids/chemistry , Galactosides/chemistry , Galactosides/isolation & purification , Galactosides/pharmacology , Kaempferols/chemistry , Kaempferols/isolation & purification , Kaempferols/pharmacology , Monosaccharides/chemistry , Monosaccharides/isolation & purification , Monosaccharides/pharmacology , Phenols/chemistry , Phenols/pharmacology , Plant Extracts/chemistry , Poland , Quercetin/analogs & derivatives , Quercetin/chemistry , Quercetin/isolation & purification , Quercetin/pharmacologyABSTRACT
The endogenous alpha-galactosidase activity of cowpea seeds was characterized and modelled assuming Michaelian behavior. The aim is to use the resulting knowledge to optimize alpha-galactoside degradation during the soaking-cooking process. In this study, the alpha-galactosidase enzyme from Wankoun cowpea was extracted and its enzymatic activity was analyzed as a function of temperature, pH and the presence of some inhibitors. Enzymatic activity was optimal around 35⯰C and a pH of 5.8. Activation and inactivation energy was evaluated at 50⯱â¯3 and 103⯱â¯9â¯kJ.mol-1, respectively. The strongest inhibitor was galactose with an inhibition constant KI of 0.28⯱â¯0.03â¯mM. Incubation of the enzyme extract with alpha-galactosides revealed a 10-h lag phase in the early stages that could be due to low pH, the action of inhibitors including galactose and the biosynthesis of alpha-galactosides. After the lag phase, the degradation of each alpha-galactoside occurred without the appearance of any intermediary product. The degradation of alpha-galactosides was observed with a Km of 1.7⯱â¯0.3â¯mM for raffinose; 3.6⯱â¯0.6â¯mM for stachyose and 15.9⯱â¯0.1â¯mM for verbascose. A long soaking step around 35⯰C is suggested to maximize the alpha-galactosides enzymatic degradation.
Subject(s)
Galactosides , Plant Proteins , Seeds/enzymology , Vigna/enzymology , Cooking , Galactosides/chemistry , Galactosides/isolation & purification , Galactosides/metabolism , Hydrogen-Ion Concentration , Hydrolysis , Kinetics , Particle Size , Plant Proteins/chemistry , Plant Proteins/isolation & purification , Plant Proteins/metabolism , TemperatureABSTRACT
Simultaneous synthesis and purification (SSP) of galacto-oligosaccharides (GOS) from lactose was conducted using a combi-biocatalyst formed by crosslinked enzyme aggregates of Aspergillus oryzae ß-galactosidase and Saccharomyces cerevisiae cells co-immobilized by entrapment in calcium alginate gel particles. Product yield obtained with the combi-biocatalyst was similar than obtained with the soluble enzyme (23.3%), having a final purity of 25.7%. During the simultaneous process, ethyl-ß-galactoside was produced from the ethanol generated as a metabolic product of yeast cells, but ethyl-ß-galactoside was considerably decreased at high aeration (4 vvm). The combi-biocatalyst can be recovered and reused but its performance is limited by the reduction of the metabolic capacity of the cells. In this way, a process was developed for the SSP of GOS from lactose, obtaining a comparable product yield and higher specific productivity than in a conventional synthesis.
Subject(s)
Aspergillus oryzae/enzymology , Enzymes, Immobilized/metabolism , Galactose/chemistry , Galactosides/metabolism , Oligosaccharides/metabolism , Saccharomyces cerevisiae/enzymology , beta-Galactosidase/metabolism , Galactosides/isolation & purification , Hydrogen-Ion Concentration , Oligosaccharides/isolation & purificationABSTRACT
Camellia oleifera is expected to provide alternative aglycone to synthesize some saponins similar to that from Schima superba with inhibitory activity against Magnaporthe oryzae. Eight theasapogenol galactosides were synthesized via protection of adjacent hydroxyl groups by a benzylidene for regioselective glycosylation in the multi-hydroxyl sapogenin. Water soluble galactose chain connected far from liposoluble end was a key group in inhibiting the growth of M. oryzea unless theasapogenol was modified by two galactosyl groups or by one galactosyl group and one benzylidene group. The amphoteric characteristics of saponin such as saccharide group number, distance between bipolar groups play an important role in inhibiting mycelium growth of M. oryzae.
Subject(s)
Galactosides/isolation & purification , Galactosides/pharmacology , Magnaporthe/drug effects , Saponins/chemical synthesis , Theaceae/chemistry , Camellia/chemistry , Galactosides/chemistry , Molecular Structure , Saponins/chemistry , Structure-Activity RelationshipABSTRACT
Phytochemical investigation of the aerial parts of Sansevieria trifasciata, one of the most common Dracaenaceae plants, has resulted in the isolation of a new dihydrochalcone derivative named trifasciatine C (1), four previously unreported steroidal saponins as two pairs of inseparable regioisomers: trifasciatosides K/L (2/3), M/N (4/5), together with the known 1,2-(dipalmitoyl)-3-O-ß-D-galactopyranosylglycerol (6), aconitic acid (7), and 1-methyl aconitic acid (8). Their structures were elucidated mainly by extensive spectroscopic analysis (1D and 2D nuclear magnetic resonance) and high-resolution electronspray ionization-mass spectrometry, as well as chemical methods and comparison of their spectral data with those of related compounds. Compounds 2/3 and 4/5 were evaluated for their antiproliferative activity on Hela cells, and no significant effect was observed.
Subject(s)
Chalcones/isolation & purification , Galactosides/isolation & purification , Sansevieria/chemistry , Saponins/isolation & purification , Aconitic Acid/analogs & derivatives , Aconitic Acid/isolation & purification , Aconitic Acid/pharmacology , Carbohydrate Sequence , Cell Proliferation/drug effects , Chalcones/pharmacology , Galactosides/pharmacology , HeLa Cells , Humans , Saponins/pharmacology , StereoisomerismABSTRACT
The purpose of this study was to explain how extracts from chokeberry and blackcurrant interact with the lipid phase of biological membrane and with human albumin - the main protein of blood. Aiming at better understanding of the observed biological activity of the extracts, we also conducted experiments with their main components: cyanidin-3-0-galactoside and cyanidin-3-0-ruthinoside. Antioxidant activities of extracts and cyanidin derivatives were investigated with phosphatidy1choline liposomes and AAPH as oxidation inducing factor. Fluorescent probes (merocyanin and N-phenyl-1-naphthylamine) that were located at different depths within the membrane lipid bilayer were also used. The interaction between the compounds and human serum albumin was investigated using natural fluorescence quenching. According to our study it is highly likely that the significant antioxidant activity of chokeberry and blackcurrant extracts (IC50chokeberry = 4.92 pg/mL; IC50blackbcurrant = 7.04 µg/mL) is probably due to cyjanidin's main derivatives, which protect the lipid membrane more than the extracts. In addition, it has been suggested that the compounds are anchored mainly on the membrane surface and rigidify/order the lipids in the membrane. That rigidifying effect is the key factor for understanding their antioxidant properties. Experimental results have proved that all the study compounds quench the fluorescence of HSA through a static mechanism and the main interaction forces are the Van der Waals and hydrogen bonding interactions. The results of the study have improved our knowledge on how to protect membranes against lipid peroxidation using extracts rich in anthocyanins. The results can be relevant to pharmacists and nutritionists.
Subject(s)
Anthocyanins/pharmacology , Antioxidants/pharmacology , Cell Membrane/drug effects , Fruit , Galactosides/pharmacology , Phosphatidylcholines/metabolism , Plant Extracts/pharmacology , Ribes , Anthocyanins/isolation & purification , Anthocyanins/metabolism , Antioxidants/isolation & purification , Antioxidants/metabolism , Cell Membrane/metabolism , Dose-Response Relationship, Drug , Fruit/chemistry , Galactosides/isolation & purification , Galactosides/metabolism , Humans , Liposomes , Membrane Fluidity/drug effects , Oxidation-Reduction , Phytotherapy , Plant Extracts/isolation & purification , Plant Extracts/metabolism , Plants, Medicinal , Protein Binding , Prunus/chemistry , Ribes/chemistry , Serum Albumin, Human/metabolism , Time FactorsABSTRACT
BACKGROUND: Acacia ataxacantha (Fabaceae), used in traditional medicine grows in the South-West of Bénin. Ethyl acetate extract of the barks of this species was previously reported to display various bioactivities, including antibacterial, antifungal and antioxidant activities. In the present study, we investigate the antimicrobial and antioxidant activities of compound isolated from ethyl acetate extract of Acacia ataxacantha. METHODS: Purification, isolation and structural identification of isolated compound were done using various chromatographic and spectroscopic methods. Antimicrobial activity was investigated using a two-fold serial microdilution method. The inhibitory potency of isolated compound was evaluated by kinetic experiments. The antioxidant activity was also determined using 2, 2-diphenyl-1-picrylhydrazyl. RESULTS: The isolated compound was identified as 7-hydroxy-2-methyl-6-[ß-galactopyranosyl-propyl]-4H-chromen-4-one. As far as we know, this compound, named "acthaside", reported for the first time, was active against all tested microorganisms with minimal inhibitory concentration ranging from 25 to 50 µg/ml. At 50 µl/ml, no growth was observed in almost all tested microbial after 24 h of exposure. The isolated compound had significant antioxidant activity with an IC50 value of 3.61 ± 0.12 µg/ml compared to quercetin (IC50 1.04 ± 0.01 µg/ml). CONCLUSION: The present work demonstrates that the new chromen derivative isolated from A. ataxacantha may help treat bacterial and yeast infections. However, further studies are required to clarify the mechanism of action of this compound.
Subject(s)
Acacia/chemistry , Anti-Infective Agents/isolation & purification , Antioxidants/isolation & purification , Chromones/isolation & purification , Galactosides/isolation & purification , Microbial Sensitivity Tests , Molecular Structure , Plant Bark/chemistryABSTRACT
Members of the fungal genus Exophiala are common saprobes in soil and water environments, opportunistic pathogens of animals, or endophytes in plant roots. Their ecological versatility could imply a capacity to produce diverse secondary metabolites, but only a few studies have aimed at characterizing their chemical profiles. Here, we assessed the secondary metabolites produced by five Exophiala sp. strains of a particular phylotype, isolated from roots of Microthlaspi perfoliatum growing in different European localities. Exophillic acid and two previously undescribed compounds were isolated from these strains, and their structures were elucidated by spectroscopic methods using MS, 1D and 2D NMR. Bioassays revealed a weak activity of these compounds against disease-causing protozoa and mammalian cells. In addition, 18 related structures were identified by UPLC/MS based on comparisons with the isolated structures. Three Exophiala strains produced derivatives containing a ß-d-glucopyranoside moiety, and their colony morphology was distinct from the other two strains, which produced derivatives lacking ß-d-glucopyranoside. Whether the chemical/morphological strain types represent variants of the same genotype or independent genetic populations within Exophiala remains to be evaluated.
Subject(s)
Benzoates/isolation & purification , Endophytes/chemistry , Exophiala/chemistry , Galactosides/isolation & purification , Benzoates/chemistry , Exophiala/genetics , Fungi/metabolism , Galactosides/chemistry , Molecular Structure , Nuclear Magnetic Resonance, Biomolecular , Plant Roots/geneticsABSTRACT
The present study was designed to determine the major chemical constituents of the leaves of Rhododendron dauricum L. Compounds were isolated and purified by various chromatographic methods, and their structures were elucidated by physicochemical properties and spectral data. The present study identified two new C-methyl flavanones, 5, 7, 3', 5'-tetrahydroxy-6, 8-di-C-methyl flavanone (1) and 5, 4'-dihydroxy-8-C-methylflavanone-7-O-ß-D-glucopyranoside (2), and one new flavonoid glycoside, quercetin-3-O-ß-D-(6"-O-cinnamoyl)-galactoside (3), along with seven known compounds, including syzalterin (4), poriolin (5), farrerol-7-O-ß-D-glucopyranoside (6), myrciacetin (7), quercetin-3-O-ß-D-(6-p-hydroxy-benzoyl)-galactoside (8), quercetin-3-O-ß-D-(6-p-coumaroyl)-galactoside (9), and 5, 7, 3', 5'-tetrahydroxyl flavanone (10). Compounds 1-3 were determined to be new flavonoids; compounds 4-6 were isolated from this species for the first time; and compounds 7-10 were reported for the first time from this genus.
Subject(s)
Flavanones/isolation & purification , Galactosides/isolation & purification , Glucosides/isolation & purification , Plant Extracts/chemistry , Quercetin/analogs & derivatives , Rhododendron/chemistry , Flavanones/chemistry , Flavonoids/chemistry , Flavonoids/isolation & purification , Galactosides/chemistry , Glucosides/chemistry , Molecular Structure , Plant Leaves/chemistry , Quercetin/chemistry , Quercetin/isolation & purificationABSTRACT
OBJECTIVE: To study the chemical constituents from the aerial part of Sibiraea angustata. METHODS: The constituents were isolated by various chromatographic techniques (HP-20 macroporous absorption resin, Sephadex LH-20 gel, RP-MPLC and PHPLC)and their structures were determined on the basis of physicochemical properties and their spectroscopic data,as well as literatures. RESULTS: Eleven compounds were separated and identified as p-methoxycinnamic acid(I), protocatechuic aldehyde(II), quercetin(III), isorhamnetin(IV), quercetin 3-O-beta-D-galactopyranoside (V),9-0-[beta-D-glucopyranoside]-3,4,5-trimethoxy cinnamyl alcohol(VI), syringaresinol-4'-O-beta-D-monoglucoside(VII), ntin(VIII), sibiraic acid(IX), sibiscolacton(X), methyl ferulic acid(XI). CONCLUSION: Compounds I-XIII are isolated from the genus of Sibiraea for the first time.
Subject(s)
Drugs, Chinese Herbal/chemistry , Plant Components, Aerial/chemistry , Rosaceae/chemistry , Benzaldehydes/chemistry , Benzaldehydes/isolation & purification , Catechols/chemistry , Catechols/isolation & purification , Chromatography, High Pressure Liquid , Cinnamates/chemistry , Cinnamates/isolation & purification , Drugs, Chinese Herbal/isolation & purification , Galactosides/chemistry , Galactosides/isolation & purification , Quercetin/analogs & derivatives , Quercetin/chemistry , Quercetin/isolation & purificationABSTRACT
The antiurease activity of the aqueous extracts of 42 plants growing in the Czech Republic was investigated. A phenol-hypochlorite reaction was used for the determination of ammonia produced by urease. The inhibitory activity of the extracts at a concentration of 0.2 mg/mL varied from 17.8% to 80.0%. Extracts from six Potentilla species expressed inhibitory activity against jack bean urease. They were further investigated for their phenolic constituents and the major compounds were subjected to molecular docking. The results revealed that both jack bean urease and Helicobacter pylori urease were inhibited by quercetin-3-O-ß-D-galactopyranoside-6â³-gallate (1), myricetin-3-O-ß-D-glucuronide (2), tiliroside (3) and B-type procyanidin (4). The antiurease activity of the investigated Potentilla species is probably due to the presence of complex phenolic constituents such as flavonoid glycosides and catechin dimers.
Subject(s)
Flavonoids/isolation & purification , Flavonoids/pharmacology , Galactosides/isolation & purification , Galactosides/pharmacology , Helicobacter pylori/drug effects , Phenols/isolation & purification , Phenols/pharmacology , Plants, Medicinal/chemistry , Potentilla/chemistry , Urease/antagonists & inhibitors , Algorithms , Canavalia/enzymology , Czech Republic , Flavonoids/chemistry , Galactosides/chemistry , Helicobacter Infections/drug therapy , Phenols/chemistry , Quercetin/analogs & derivativesABSTRACT
Two new anthocyanidin glycosides were isolated from the pale red flowers of Catharanthus roseus 'Equator Apricot with Red Eye', and identified as 7-O-methylpelargonidin 3-O-[6-O-(alpha-rhamnopyranosyl)-beta-galactopyranoside] and 7-O-methylpelargonidin 3-O-(beta-galactopyranoside) by chemical and spectroscopic methods.
Subject(s)
Anthocyanins/isolation & purification , Catharanthus/chemistry , Galactosides/isolation & purification , Glycosides/isolation & purification , Anthocyanins/chemistry , Flowers/chemistry , Pigments, Biological/chemistryABSTRACT
ETHNOPHARMACOLOGICAL RELEVANCE: Davilla elliptica St.-Hil. (Dilleniaceae) is a medicinal plant traditionally used in Brazil to treat inflammatory processes, to relieve pain, as diuretic, gastro- and hepatoprotective agents. AIM OF THE STUDY: To undertake the fractionation of the ethanolic extract from Davilla elliptica leaves guided by an antinociceptive assay. MATERIALS AND METHODS: The antinociceptive activity was evaluated through the formalin test in mice. Extract fractionation was performed by percolation through silica gel and partition between immiscible solvents, followed by successive column chromatography over Sephadex LH-20 and preparative RP-HPLC. Structure elucidation of the isolated compound was accomplished by spectroscopic data. RESULTS: The EtOAc and MeOH fractions derived from the crude extract reduced significantly the licking time in the late phase of the formalin test. The bioguided fractionation of the MeOH fraction resulted in the isolation of myricetin-3-O-ß-galactopyranoside, which produced significant inhibition on nociception induced by formalin (ID50=0.26 mg/kg; p.o.). CONCLUSIONS: These results point out that myricetin-3-O-ß-galactopyranoside contributes for the antinociceptive effect of Davilla elliptica extract, a constituent considerably more potent than diclofenac, employed as reference drug.
Subject(s)
Analgesics/therapeutic use , Dilleniaceae , Flavonoids/therapeutic use , Galactosides/therapeutic use , Pain/drug therapy , Plant Extracts/therapeutic use , Analgesics/isolation & purification , Animals , Flavonoids/isolation & purification , Formaldehyde , Galactosides/isolation & purification , Male , Mice , Pain/chemically induced , Phytotherapy , Plant LeavesABSTRACT
Chromatographic purification of ethyl acetate soluble fraction of the methanolic extract of the flowers of Aerva javanica yielded three new acylated flavone glycosides: kaempferol-3-O-ß-d-[4â´-E-p-coumaroyl-α-l-rhamnosyl(1 â 6)]-galactoside (1), kaempferol-3-O-ß-d-[4â´-E-p-coumaroyl-α-l-rhamnosyl(1 â 6)]-(3â³-E-p-coumaroyl)galactoside (2), and kaempferol-3-O-ß-d-[4â´-E-p-coumaroyl-α-l-rhamnosyl(1 â 6)]-(4â³-E-p-coumaroyl)galactoside (3), along with p-coumaric acid (4), caffeic acid (5), gallic acid (6), eicosanyl-trans-p-coumarate (7), hexadecyl ferulate (8), and hexacosyl ferulate (9). The compounds 1-9 were characterized using 1D ((1)H, (13)C) and 2D NMR (HMQC, HMBC, and COSY) spectroscopy and mass spectrometry (EI-MS, HR-EI-MS, FAB-MS, and HR-FAB-MS) and in comparison with the reported data in the literature. Compound 1 showed weak inhibitory activity against enzymes, such as acetylcholinesterase, butyrylcholinesterase, and lipoxygenase with IC50 values 205.1, 304.1, and 212.3 µM, respectively, whereas compounds 2 and 3 were only weakly active against the enzyme acetylcholinesterase.
Subject(s)
Amaranthaceae/chemistry , Cholinesterase Inhibitors/isolation & purification , Galactosides/isolation & purification , Glycosides/isolation & purification , Kaempferols/isolation & purification , Plants, Medicinal/chemistry , Caffeic Acids/chemistry , Caffeic Acids/isolation & purification , Cholinesterase Inhibitors/chemistry , Cholinesterase Inhibitors/pharmacology , Coumaric Acids/chemistry , Coumaric Acids/isolation & purification , Flowers/chemistry , Galactosides/chemistry , Galactosides/pharmacology , Gallic Acid/chemistry , Gallic Acid/isolation & purification , Glycosides/chemistry , Glycosides/pharmacology , Inhibitory Concentration 50 , Kaempferols/chemistry , Kaempferols/pharmacology , Molecular Structure , Nuclear Magnetic Resonance, Biomolecular , Pakistan , PropionatesABSTRACT
Increasing evidence has shown that beyond its role in coagulation, endothelial protein C receptor (EPCR) plays an important role in the cytoprotective pathway. Previous reports have shown that EPCR can be shed from the cell surface, and that this is mediated by tumor necrosis factor-α converting enzyme (TACE) and that sEPCR levels are increased in patients with systemic inflammatory diseases. Persicarin and isorhamnetin-3-O-galactoside (I3G) are active compounds from Oenanthe javanica, which has been widely studied for its neuroprotective, antioxidant, and barrier protective activities. However, little is known of the effects of persicarin on EPCR shedding. Here, we investigated this issue by monitoring the effects of persicarin and I3G on phorbol-12-myristate 13-acetate (PMA) and on cecal ligation and puncture (CLP)-mediated EPCR shedding and underlying mechanisms. According to the results, persicarin and I3G induced potent inhibition of PMA and CLP-induced EPCR shedding by suppressing expression of TACE. In addition, persicarin and I3G reduced PMA-stimulated phosphorylation of p38MAPK, extracellular regulated kinases (ERK) 1/2, and c-Jun N-terminal kinase (JNK). Given these results, persicarin and I3G could be used as a candidate therapeutic for treatment of severe vascular inflammatory diseases.