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1.
Int J Mol Sci ; 25(13)2024 Jun 28.
Artigo em Inglês | MEDLINE | ID: mdl-39000246

RESUMO

Quorum sensing (QS) allows bacteria to coordinate their activities by producing and detecting low-molecular-weight signal molecules based on population density, thereby controlling the infectivity of bacteria through various virulence factors. Quorum-sensing inhibition is a promising approach to tackle bacterial communication. Cyclodextrins (CDs) are a class of cyclic oligosaccharides that reversibly encapsulate the acyl chain of the signal molecules, thereby preventing their binding to receptors and interrupting bacterial communication. This results in the inhibition of the expression of various properties, including different virulence factors. To examine the potential quorum-quenching (QQ) ability of newly prepared cyclodextrin derivatives, we conducted short-term tests using Aliivibrio fischeri, a heterotrophic marine bacterium capable of bioluminescence controlled by quorum sensing. α- and ß-cyclodextrins monosubstituted with alkylthio moieties and further derivatized with quaternary ammonium groups were used as the test agents. The effect of these cyclodextrins on the quorum-sensing system of A. fischeri was investigated by adding them to an exponential growth phase of the culture and then measuring bioluminescence intensity, population growth, and cell viability. Our results demonstrate that the tested cyclodextrins have an inhibitory effect on the quorum-sensing system of A. fischeri. The inhibitory effect varies based on the length of the alkyl chain, with alkylthio substitution enhancing it and the presence of quaternary ammonium groups decreasing it. Our findings suggest that cyclodextrins can be a promising therapeutic agent for the treatment of bacterial infections.


Assuntos
Aliivibrio fischeri , Ciclodextrinas , Percepção de Quorum , Aliivibrio fischeri/efeitos dos fármacos , Percepção de Quorum/efeitos dos fármacos , Ciclodextrinas/farmacologia , Ciclodextrinas/química , Medições Luminescentes/métodos , Luminescência
2.
Molecules ; 28(5)2023 Feb 24.
Artigo em Inglês | MEDLINE | ID: mdl-36903361

RESUMO

Although crystallization has been widely applied for the enantiomeric enrichment of non-racemates both in research and in industrial applications, the physical-chemical background of chiral crystallizations is not as frequently discussed. A guide for the experimental determination of such phase equilibrium information is lacking. In the current paper, the experimental investigation of chiral melting phase equilibria, chiral solubility phase diagrams and their application in atmospheric and supercritical carbon dioxide-assisted enantiomeric enrichment is described and compared. Benzylammonium mandelate is a racemic compound; it shows eutectic behavior when molten. A similar eutonic composition was observed in its methanol phase diagram at 1 °C. The influence of the ternary solubility plot could be unequivocally discovered in atmospheric recrystallization experiments, which proved that the crystalline solid phase and the liquid phase were in an equilibrium. The interpretation of the results obtained at 20 MPa and 40 °C, using the methanol-carbon dioxide mixture as a pseudo-component, was more challenging. Although the eutonic composition was found to be the limiting enantiomeric excess value in this purification process as well, the high-pressure gas antisolvent fractionation results were only clearly thermodynamically controlled in certain concentration ranges.

3.
Molecules ; 28(8)2023 Apr 08.
Artigo em Inglês | MEDLINE | ID: mdl-37110544

RESUMO

A stereospecific capillary electrophoresis method was developed for the separation of the novel, antipsoriatic agent, apremilast (APR). Six anionic cyclodextrin (CD) derivatives were screened for their ability to discriminate between the uncharged enantiomers. Only succinyl-ß-CD (Succ-ß-CD) presented chiral interactions; however, the enantiomer migration order (EMO) was unfavorable, and the eutomer, S-APR, migrated faster. Despite the optimization of all possible parameters (pH, cyclodextrin concentration, temperature, and degree of substitution of CD), the method was unsuccessful for purity control due to the low resolution and the unfavorable enantiomer migration order. Changing the direction of electroosmotic flow (EOF) by the dynamic coating of the inner surface of the capillary with poly(diallyldimethylammonium) chloride or polybrene resulted in EMO reversal, and the developed method could be applied for the determination of R-APR as the enantiomeric purity. Thus, the application of the dynamic capillary coating offers a general opportunity for enantiomeric migration order reversal in particular cases when the chiral selector is a weak acid.

4.
Molecules ; 27(24)2022 Dec 09.
Artigo em Inglês | MEDLINE | ID: mdl-36557853

RESUMO

Pyrethroid insecticides are broadly used. They have low toxicity for warm-blooded living creatures, but high toxicity for both insects and fish. Therefore, it is important to reduce the environmental impact of pyrethroids. Pyrethroic acids are chiral compounds. An effective way to decrease pollution is to use enantio-pure insecticide products instead of their racemic mixtures. Enantiomer-pure products require enantiomer selective synthesis and analysis. The chiral selective analysis of pyrethroic acids (an intermediate of pyrethroids) is also important in terms of process control and from the point of view of their degradation metabolism in the environment. This study used various enantiomeric selective chromatographic methods for the separation of different pyrethroic acids, including gas chromatography, supercritical fluid chromatography and capillary electrophoresis. Systematic experiments were conducted to find the optimum conditions for their chiral separation. The employed enantio-selective agents were cyclodextrin derivatives with different ring sizes and substitution patterns. The ß-cyclodextrin proved to be excellent for the chiral separation of these acids. The different chiral recognition mechanisms were established using different ring-sized cyclodextrins. The results of these systematic studies demonstrated the correlations of the chiral selectivity features of selectors and the structures of analytes.


Assuntos
Ciclodextrinas , Inseticidas , Piretrinas , Ciclodextrinas/química , Eletroforese Capilar/métodos , Cromatografia Gasosa , Estereoisomerismo
5.
Electrophoresis ; 40(15): 1941-1950, 2019 08.
Artigo em Inglês | MEDLINE | ID: mdl-30892708

RESUMO

The exhaustive primary-side alkylation of cyclodextrins has never been achieved directly. The undesired and simultaneous derivatization of the secondary hydroxyl moieties generates intricate isomeric mixtures that are challenging to purify, analyse and characterize. The aim of this study was to develop a chromatography-free and up-scalable strategy towards the preparation of per-6-O-methylated cyclodextrin and to test the compound as potential chiral selector. The target molecule was prepared according to a five-step synthesis by using methyltriphenylphosphonium bromide as catalyst under heterogeneous conditions. The removal of benzyl moieties, used as temporary secondary-side protecting groups, was attained by applying hydrazine-carbonate in the presence of Pd/C. All the intermediates were obtained in high yields, thoroughly characterized and their purity was assessed by ad-hoc developed HPLC methods. The per-6-O-methylated ß-cyclodextrin showed promising chiral recognition ability as background electrolyte additive in cyclodextrin-modified capillary electrophoresis using the recreational drug methylene-dioxypyrovalerone as model compound. Additionally, a model for the inclusion geometry between the single isomer host and the selected drug was developed based on the extensive 2D NMR analysis. The versatility of the proposed synthetic strategy opens the way to the industrial production of homogeneously primary-alkylated cyclodextrins and to their wide application in chiral separation of various drugs.


Assuntos
Hidrazinas/química , beta-Ciclodextrinas/química , beta-Ciclodextrinas/síntese química , Benzodioxóis/análise , Benzodioxóis/química , Benzodioxóis/isolamento & purificação , Catálise , Cromatografia Líquida de Alta Pressão/métodos , Eletroforese Capilar/métodos , Hidrogenação , Espectroscopia de Ressonância Magnética/métodos , Modelos Químicos , Pirrolidinas/análise , Pirrolidinas/química , Pirrolidinas/isolamento & purificação , Estereoisomerismo , Catinona Sintética
6.
Electrophoresis ; 40(21): 2789-2798, 2019 11.
Artigo em Inglês | MEDLINE | ID: mdl-31295759

RESUMO

The chiral separation ability of the full library of methylated-ß-cyclodextrins towards pharmacologically significant racemic drugs including basic compounds was studied by chiral CE. The syntheses of all the methylated, single isomer ß-cyclodextrins were revised and optimized and the aqueous solubility of the derivatives was unambiguously established. The three most relevant commercially available methylated isomeric mixtures were also included in the screening, so a total of ten various methylated CDs were investigated. The effects of the selector concentration on the enantiorecognition properties at acidic pH were investigated. Among the dimethylated ß-cyclodextrins, the heptakis (2,6-di-O-methyl)-ß-cyclodextrin isomer (2,6-DIMEB) resulted to be the most versatile chiral selector. Terbutaline was selected as a model compound for the in-depth investigation of host-guest enantiodiscrimination ability. The association constants between the two terbutaline enantiomers and 2,6-DIMEB were determined in order to support that the enantioseparation is driven by differences is host-guest binding. The migration order of the enantiomers was confirmed by performing spiking experiments with the pure enantiomers. 1D and 2D NMR spectroscopy was applied to the 2,3-, and 2,6-DIMEB/terbutaline systems to rationalize at molecular level the different enantioseparation ability of the dimethylated ß-cyclodextrin selectors.


Assuntos
Eletroforese Capilar/métodos , beta-Ciclodextrinas/química , Modelos Químicos , Modelos Moleculares , Estereoisomerismo , Terbutalina/análise , Terbutalina/química , Terbutalina/isolamento & purificação
7.
Beilstein J Org Chem ; 15: 710-720, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-30992718

RESUMO

The regioselective difunctionalization of cyclodextrins (CDs) leading to derivatives amenable to further transformations is a daunting task due to challenging purification and unambiguous characterization of the obtained regioisomers with similar physicochemical properties. The primary-side homo-difunctionalization of ß-CD can lead to three regioisomers, while the hetero-difunctionalization can generate three pairs of pseudoenantiomers. Previously, approaches with several synthetic steps, expensive reagents, high purification demands and low yields of the products have been employed. Herein we present direct, short and efficient primary-side difunctionalization strategies featuring reproducibility, ease of product purification, scalability of the reactions and versatility of the substituents introduced. Specifically, the prepared ditosylated ß-CDs were separated using preparative reversed-phase column chromatography and their structures were elucidated by NMR experiments. Azidation led to the corresponding pure diazido regioisomers. Direct monotosylation of 6-monoazido-ß-CD or monoazidation of the single regioisomers 6A,6X-ditosyl-ß-CDs afforded hetero-difunctionalized 6A-monoazido-6X-tosyl-ß-CDs in significant yields. Overall, the single regioisomers, 6A,6X-ditosyl-, 6A,6X-diazido- and 6A-monoazido-6X-monotosyl-ß-CD were prepared in one or two steps and purified in multigram scale thus opening the way towards further selective and orthogonal functionalizations of ß-CD hosts.

8.
Acta Biol Hung ; 69(2): 156-169, 2018 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-29888668

RESUMO

In this study, we analyzed extracts of Ribes (black currant, red currant and gooseberry) fruits obtained with methanol, methanol 50% and water. For each extract total polyphenol content, total flavonoid content and total anthocyanin content was assessed. The antioxidant activity of extracts was evaluated by 1,1-Diphenyl-2-picrylhydrazyl (DPPH) and 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) radical scavenging capacity and by the photo-chemiluminescence (PCL) method. Identification and quantification of individual phenolic compounds was performed by means of high performance liquid chromatograph coupled with diode array detector (HPLC-DAD) analyses. From each fruit, best extraction of polyphenols was obtained with methanol 50%. In case of red currants and gooseberry there was no significant difference in flavonoids and anthocyanins extraction rate by the different extraction solvents. For black currants the methanol and methanol 50% extract presented the highest antioxidant activity. For red currants extracts with methanol 50% showed stronger antioxidant activity (IC50 = 5.71 mg/ml for DPPH, IC50 = 1.17 mg/ml for ABTS) than those with methanol or water. In case of gooseberry by the DPPH test the water extract proved to be the most active (IC50 = 5.9 mg/ml). In the PCL test black currants methanol 50% extract was over 6 times more powerful as the ones from red currants. In case of gooseberries, water extract presented the highest antioxidant activity (41.84 µmol AAE/g). In black currant cyanidin-3-glucoside was the major compound. Quercetin 3-O-glucoside was identified in each sample. From cinnamic acid derivatives neochlorogenic acid was present in black currants in the highest amount (356.33 µg/g).


Assuntos
Sequestradores de Radicais Livres/farmacologia , Extratos Vegetais/farmacologia , Antocianinas/análise , Antioxidantes/farmacologia , Benzotiazóis , Compostos de Bifenilo , Ácido Clorogênico/análogos & derivados , Ácido Clorogênico/análise , Cromatografia Líquida de Alta Pressão , Glucosídeos/análise , Indicadores e Reagentes , Medições Luminescentes , Picratos , Extratos Vegetais/análise , Polifenóis/análise , Quercetina/análogos & derivados , Quercetina/análise , Ácido Quínico/análogos & derivados , Ácido Quínico/análise , Ribes , Ácidos Sulfônicos
9.
Electrophoresis ; 38(15): 1869-1877, 2017 08.
Artigo em Inglês | MEDLINE | ID: mdl-28378327

RESUMO

In this work, the synthesis, characterization, and chiral capillary electrophoretic study of heptakis-(2,3-di-O-methyl-6-O-carboxymethyl)-ß-CD (HDMCM), a single-isomer carboxymethylated CD, are presented. The pH-dependent and selector concentration-dependent enantiorecognition properties of HDMCM were investigated and discussed herein. The enantioseparation was assessed applying a structurally diverse set of noncharged, basic, and zwitterionic racemates. The increase in the selector concentration and gross negative charge of HDMCM improved the enantioseparation that could be observed in the majority of the cases. HDMCM was also successfully applied as BGE additive in NACE using a methanol-based system in order to prove the separation selectivity features and to highlight the broad applicability of HDMCM. Over 25 racemates showed partial or baseline separation with HDMCM under the conditions investigated, among which optimal enantiomer migration order was found for the four stereoisomers of tadalafil, tapentadol, and dapoxetine, offering the possibility of a chiral CE method development for chiral purity profiling of these drugs.


Assuntos
Eletroforese Capilar/métodos , beta-Ciclodextrinas/química , Eletroforese Capilar/instrumentação , Concentração de Íons de Hidrogênio , Metanol/química , Preparações Farmacêuticas/análise , Preparações Farmacêuticas/química , Preparações Farmacêuticas/isolamento & purificação , Estereoisomerismo
10.
Acta Biol Hung ; 68(3): 321-333, 2017 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-28901804

RESUMO

In this study field restharrow (Ononis arvensis) was investigated for histological and antimicrobial features. The aerial part and the root were embedded in synthetic resin and investigated following sectioning by a rotation microtome. The antimicrobial activity and minimum inhibitory concentration of the solvent fractions of the aerial part were studied against four bacterial strains and one fungus. According to histology, the root covered by rhizodermis contains contiguous vascular elements, which are surrounded by sclerenchyma cells. The epidermis cells are anisodiametric in the stem, sepal, and petal. The bundles of the stem form a Ricinus type thickening. The adaxial side of the heterogeneous leaf is covered by unbranching non-glandular and capitate glandular trichomes. The stipule, petiole, sepals and petals are isolateral having mesomorphic stomata. Pollen grains are tricolpate. The different extracts of the herb showed antimicrobial activity against Escherichia coli, Pseudomonas aeruginosa, Salmonella Typhimurium, Staphylococcus aureus, and Candida albicans. Data show that the extracts of the leaf contain compounds which may be responsible for the antifungal effect, while extracts obtained from display against the tested bacteria, except Escherichia coli. Further studies are required to complete the phytochemical analysis and identify the antimicrobial compounds of extracts.


Assuntos
Anti-Infecciosos/administração & dosagem , Fenômenos Fisiológicos Bacterianos/efeitos dos fármacos , Fungos/efeitos dos fármacos , Ononis/química , Extratos Vegetais/administração & dosagem , Extratos Vegetais/química , Anti-Infecciosos/química , Sobrevivência Celular/efeitos dos fármacos , Fungos/fisiologia , Componentes Aéreos da Planta/química , Raízes de Plantas/química
11.
Biomed Chromatogr ; 30(6): 923-32, 2016 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-26433204

RESUMO

In this study the polyphenolic composition of lilac flowers and fruits was determined for the first time. For the identification of compounds, accurate molecular masses and formulas, acquired by LC and ESI-TOF-MS and fragmentation pattern given by LC-ESI/MS/MS analyses, were used. Our chromatographic system in conjunction with tandem MS was found to be valuable in the rapid separation and determination of the multiple constituents in methanolic extracts of lilac flowers and fruits. Altogether 34 phenolics, comprising 18 secoiridoids, seven phenylpropanoids, four flavonoids and five low-molecular-weight phenols, were identified. As marker compounds two secoiridoids (oleuropein and nuzhenide), two phenylpropanoids (acteoside and echinacoside) and rutin were quantified by validated methods. As a result of quantitative analysis, it was confirmed that flowers contain significant amounts of phenylpropanoids (acteoside, 2.48%; echinacoside, 0.75%) and oleuropein (0.95%), while in fruits secoiridoid oleuropein (1.09%) and nuzhenide (0.42%) are the major secondary metabolites. The radical scavenging activities of the extracts and the constituents were investigated by DPPH (2,2-diphenyl-1-picrylhydrazyl) and ABTS [2,2'-azino-bis-(3-ethylbenzothiazoline-6-sulfonic acid)] assays. Both extracts show remarkable antioxidant activities. Our results clearly show that lilac flowers and fruits are inexpensive, readily available natural sources of phenolic compounds with pharmacological and cosmetic applications. Copyright © 2015 John Wiley & Sons, Ltd.


Assuntos
Antioxidantes/química , Cromatografia Líquida de Alta Pressão/métodos , Flores/química , Fenóis/química , Espectrometria de Massas por Ionização por Electrospray/métodos , Espectrofotometria Ultravioleta/métodos , Syringa/química
12.
Beilstein J Org Chem ; 12: 2873-2882, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-28144360

RESUMO

Advanced oxidation processes (AOPs) are considered highly competitive water treatment technologies for the removal of organic pollutants. Among AOP techniques, photocatalysis has recently been the most widely studied. Our aims were to investigate how the dispersion of nanosized titanium dioxide (nanoTiO2) applied in photodegradation-based procedures can be stabilized with cyclodextrins in order to obtain a new, more efficient photocatalyst for the purification of waters polluted by xenobiotics applying UV irradiation. During our work, on the one hand, we studied the behavior and stability of nanoTiO2 in cyclodextrin solutions. On the other hand, we used various monomer and polymer cyclodextrin derivatives, and assessed the options for nanoTiO2 stabilization in the presence of various salts and tap water on the basis of turbidity tests. The physical stability of nanoTiO2 dispersions is diminished in the presence of the salts found in tap water (and occurring also in surface waters and ground water) and they are precipitated immediately. This colloidal instability can be improved by cyclodextrin derivatives. Based on the results of our studies we have selected carboxymethyl ß-cyclodextrin polymer (CMBCD-P) for stabilization of nanoTiO2 dispersions. The photocatalytic degradation of methylene blue and ibuprofen as model organic pollutants in various media (distilled water, NaCl solution and tap water) has been studied using nanoTiO2 as catalyst stabilized by CMBCD-P. CMBCD-P itself showed a catalytic effect on the UV degradation of methylene blue. In addition to enhancing the colloid stability of nanoTiO2 CMBCD-P showed also synergistic effects in catalyzing the photodecomposition process of the dye. On the other hand, ibuprofen as a model pharmaceutical, a pollutant of emerging concern (EP), was protected by CMBCD-P against the photocatalytic degradation showing that inclusion complex formation can result in opposite effects depending on the structure of the host-guest complex.

13.
Plant Mol Biol ; 87(1-2): 125-41, 2015 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-25398395

RESUMO

The phosphorylation of plant retinoblastoma-related (RBR) proteins by cyclin-dependent kinases (CDKs) is well documented, but the counteracting phosphatases have not been identified yet. We report here that rice retinoblastoma-related protein-1 (OsRBR1) interacted with the B″ subunit of rice protein phosphatase 2A (OsPP2A B″) and underwent reversible phosphorylation during the cell division cycle. The OsRBR1-OsPP2A B" association required B domain in OsRBR1 and the C-terminal region of OsPP2A B″. We found by immunoprecipitation that OsPP2A B″, OsPP2A catalytic subunit subtype II, PSTAIRE-type CDK and OsRBR1 were in the same protein complex, indicating a physical association between the phosphatase, the kinase and their common substrate. OsPP2A B″ contains three predicted CDK phosphorylation sites: Ser95, Ser102 and Ser119. The in vitro phosphorylation of Ser95 and Ser119 with PSTAIRE-kinases was verified by mass spectrometry. We generated a series of phosphorylation site mutants to mimic the dephosphorylated or phosphorylated states of OsPP2A B″, and confirmed that all of the three predicted sites can be phosphorylated. Yeast two-hybrid experiments suggested that the phosphorylation of OsPP2A B″ promoted the formation of the OsPP2A holoenzyme. A triple phosphorylation mimicking OsPP2A B″ mutant containing holoenzyme showed higher activity in phosphatase assays. Our data collectively show that the phosphatase activity of OsPP2A against OsRBR1 is regulated by the phosphorylation of its B″ regulatory subunit. However, the analysis of the effect of okadaic acid, a phosphatase inhibitor, in rice cell suspension cultures revealed that the dephosphorylation of OsRBR1 was completely inhibited only by high dose (300 nM) of the okadaic acid during the cell cycle progression. Therefore the role of the protein phosphatase 1 should be considered as an additional post translational regulatory component of RBR protein function in higher plants.


Assuntos
Oryza/metabolismo , Proteína Fosfatase 2/metabolismo , Proteína do Retinoblastoma/metabolismo , Sequência de Aminoácidos , Western Blotting , Domínio Catalítico , Cromatografia Líquida , Quinases Ciclina-Dependentes/metabolismo , Dados de Sequência Molecular , Mutagênese Sítio-Dirigida , Fosforilação , Proteína Fosfatase 2/química , Proteína Fosfatase 2/genética , Espectrometria de Massas em Tandem , Técnicas do Sistema de Duplo-Híbrido
14.
Acta Pharm Hung ; 85(3): 89-95, 2015.
Artigo em Húngaro | MEDLINE | ID: mdl-26642647

RESUMO

The mullein (Verbascum phlomoides L., V thapsus L., V. thapsiforme Schrad., V. speciosum L.) is a medicinal herb known and used for a long time, especially in traditional Turkish medicine. The aims of our study were to identify the species and study the plant's major active substances both qualitatively and quantitatively, comparing it to data found in scientific literature. The plants were identified as probable hybrids of V. phlomoides and V. thapsiforme. Microscopic analysis of the flowers showed no major difference between the specimens. The diameter of both stomata and pollen we observed was around 15-20 µm. Important flavonoids like rutin and quercetin were identified. Dosage resulted in a 0.135% total flavonoid aglycone content. (expressed as hypericin) and a 1.3% total flavonoid glycoside content (expressed as rutoside). Thin layer chromatography from saponines revealed two spots. A hemolytic index of 13095 was also determined. Repeating the dosage experiment a year later resulted in significantly lower flavonoid aglycone and glycoside content (0.006% and 0.95% respectively) as well as a hemolytic index of approximately 4000.


Assuntos
Hemólise/efeitos dos fármacos , Farmacognosia , Plantas Medicinais/química , Verbascum/química , Antracenos , Cromatografia em Camada Fina , Flavonoides/isolamento & purificação , Flores/química , Perileno/análogos & derivados , Perileno/isolamento & purificação , Farmacognosia/métodos , Quercetina/isolamento & purificação , Rutina/isolamento & purificação , Saponinas/isolamento & purificação
15.
Acta Pharm Hung ; 84(2): 63-7, 2014.
Artigo em Húngaro | MEDLINE | ID: mdl-25167701

RESUMO

The aim of our study was to asses the efficacy of Xanthii spinosi herba in the treatment of rats with benign prostate hypertrophia induced under experimental conditions. Benign prostate hypertrophia (BPH) was induced by per oral (p.o.) administration of testosterone undecanoate (40 mg Undestor capsules) in concentrations of 15 mg/ kg/day and 35 mg/ kg/day. Drug induced BPH was treated with Xanthii spinosi herba as infusion and tincture. Drug induced benign prostate hyperplasia in rats was accompanied by a series of physical changes, like weight increase and shinier fur, and also by behavioral changes (increased appetite, aggression, increased libido). Prostate size was higher in all groups of animals treated with testosterone undecanoate compared to the control group. The morphopathological study of the organs taken from slaughtered animals, showed some microscopic changes in the prostate. In animals treated with Xanthii spinosi herba (infusion and tincture) we observed a decrease in volume of the prostate, while the microscopic changes were absent.


Assuntos
Fitoterapia/métodos , Extratos Vegetais/administração & dosagem , Plantas Medicinais , Próstata/efeitos dos fármacos , Hiperplasia Prostática/tratamento farmacológico , Testículo/efeitos dos fármacos , Androgênios , Animais , Apetite/efeitos dos fármacos , Esquema de Medicação , Infusões Intravenosas , Libido/efeitos dos fármacos , Masculino , Tamanho do Órgão/efeitos dos fármacos , Hiperplasia Prostática/induzido quimicamente , Ratos , Testosterona/análogos & derivados
16.
Acta Pharm Hung ; 84(3): 105-10, 2014.
Artigo em Húngaro | MEDLINE | ID: mdl-25470977

RESUMO

Phytochemical studies of Epilobium angustifolii herba aimed the determination of the active ingredients; antimicrobial activity of the aqueous and ethanolic extracts against human pathogenic bacteria and fungi was also examined. Six flavonoid and 4 phytosterol fractions were identified by thin layer chromatography, while tannins were present in low concentration. It has been shown that not only the ethanolic but also the aqueous extracts had inhibitory effect on certain pathogenic microorganisms, therefore E. angustifolium could be used for the development of external phytotherapic or disinfectant preparations.


Assuntos
Antibacterianos/farmacologia , Antifúngicos/farmacologia , Epilobium , Extratos Vegetais/farmacologia , Desinfetantes/farmacologia , Humanos , Compostos Fitoquímicos , Fitoterapia
17.
Plants (Basel) ; 12(24)2023 Dec 08.
Artigo em Inglês | MEDLINE | ID: mdl-38140443

RESUMO

The carotenoid composition of the flower of Telekia speciosa was investigated for the first time by HPLC-DAD-MS. In addition to the main carotenoid lutein and its geometrical isomers, 5,6-epoxy-carotenoids, namely violaxanthin, lutein 5,6-epoxide and antheraxanthin, were detected in larger amounts. In addition, ß-carotene 5,6-epoxide and ß-carotene 5,6,5',6'-diepoxide were found, which occurs very rarely in plants. For unambigous identification, ß-carotene 5,6-epoxide and ß-carotene 5,6,5',6'-diepoxide were prepared semisynthetically, and they were characterized by 1H and 13C NMR and HPLC-CD methods.

18.
J Chromatogr A ; 1683: 463506, 2022 Nov 08.
Artigo em Inglês | MEDLINE | ID: mdl-36195006

RESUMO

The present contribution describes the application of three single-isomeric cyclodextrin derivatives for the first time - Sugammadex, Subetadex and Sualphadex as chiral selectors. Their recognition ability was investigated by means of chiral capillary electrophoresis, on a pool of cathinone and amphetamine derivatives. The selectors differ in cavity sizes and in the number of ionizable groups which evidently influenced their enantioselectivity performance. Their common feature is their high isomeric purity that enabled the detailed study of the molecular association between the cathinone guest and the cyclodextrin host at the atomic level. With the aid of enantiopure cathinone derivatives, the migration order could also be determined in capillary electrophoresis. As the result of the capillary electrophoresis screening, partial or baseline chiral separation of 19 cathinones and an amphetamine derivative could be achieved, and the systematic study was performed focusing on three different pH conditions pH = 7.0, pH = 5.0 and pH = 2.5 and several different selector concentrations. Among the tested derivatives Subetadex is the best performing chiral selector, especially under acidic pH values for separating enantiomers, proven not only by capillary electrophoresis but also by 1D and 2D NMR measurements.


Assuntos
Ciclodextrinas , beta-Ciclodextrinas , Ciclodextrinas/química , Sugammadex , beta-Ciclodextrinas/química , Eletroforese Capilar/métodos , Estereoisomerismo
19.
Clin Dermatol ; 40(6): 651-664, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35914644

RESUMO

From the beginning of recorded history through the present day, dermatologic disorders have been treated with ethnomedicine remedies. We present the ethnodermatologic practices in Transylvania, Romania. We conducted ethnomedicine surveys in 35 villages in Transylvania (2007-2019). The 650 people interviewed were questioned about the treatment of dermatologic disorders by drugs derived from plant, animal, human, or other origins. Collected data were compared to earlier records of the regions and other European countries, completed with relevant pharmacologic studies of some plants. A total of 180 drugs were documented for 45 skin problems, including 112 plants, 1 fungus, 19 animals, 5 humans, and 43 other materials used in 11 preparation forms. Among these, 144 drugs were mentioned in humans, 10 in veterinary medicines, and 26 included in both therapies with overlapping human/animal (eg, Petroselinum crispum) and specific uses (eg, Daphne mezereum, Scrophularia nodosa). Compared to data from other countries, the local use of 32 plants and various animals and minerals was described only in the study area. The present study demonstrates that ethnomedicine practices are a valuable source of knowledge for skin diseases and highlight the relevance of fieldwork in the selected regions of Transylvania.


Assuntos
Plantas Medicinais , Animais , Humanos , Medicina Tradicional , Inquéritos e Questionários , Romênia , Conhecimento , Fitoterapia
20.
Biol Futur ; 72(2): 251-256, 2021 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-34554478

RESUMO

Calluna vulgaris (L.) Hull belonging to Ericaceae family occurs mostly at sour habitats in subalpine regions in Europe. The species is cultivated in many countries, but it is known as medicinal plant because of polyphenols and aucubin as main compounds. In this work, the polyphenolic, flavonoid, and tannin content, as well as the antimicrobial and antioxidant activity of the aerial part, were evaluated. In phytochemical analyses, methanol extract showed the highest phenolic and flavonoid content, followed by ethanol, methanol/water, and aqueous extracts. In antimicrobial tests, chloroform, ethyl acetate, butanol, and water extracts inhibited the growth of S. aureus and MRSA, while butanol and water fractions were effective against E. coli, and water extract for E. coli ESBL and K. pneumoniae ESBL. Water extract showed the most inhibitory effect for the tested 2 g-positive and 3 g-negative strains including both bactericidal and bacteriostatic activity. Data analysed by Pearson coefficient correlation showed positive correlation between polyphenol and flavonoid content. The determined antioxidant capacity of the herb ranged from 0.145 to 0.296 mg/mL. The results highlight the significance of the plant as possible antioxidant source and as an antimicrobial agent for further studies.


Assuntos
Anti-Infecciosos/farmacocinética , Antioxidantes/farmacocinética , Calluna/metabolismo , Extratos Vegetais/uso terapêutico , Polifenóis/isolamento & purificação , Anti-Infecciosos/metabolismo , Anti-Infecciosos/farmacologia , Antioxidantes/metabolismo , Antioxidantes/farmacologia , Extratos Vegetais/administração & dosagem
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