The aim of the study is to investigate the differences in the interaction of three structurally diverse anthocyanidins, namely peonidin, petunidin, and delphinidin, as well as their glucosides with model biological membranes, human albumin, and plasmid DNA in order to look into their structure-activity relationships. Fluorimetric studies, as well as ATR-FTIR analyses, were jointly used in order to determine the changes observed in both the hydrophilic and hydrophobic layers of cell-mimic membranes (MM) which reflected the membrane lipid composition of tumour cells and red blood cell membranes (RBCM). Our results showed that anthocyanins and anthocyanidins can cause an increase in the packing order of the polar heads of lipids, as well as interact with their deeper layers by reducing the fluidity of lipid chains. The results presented here indicate that all compounds tested here possessed the ability to bind to human serum albumin (HSA) and the presence of a glucose molecule within the structures formed by anthocyanidin reduces their ability to bind to proteins. Using fluorescence correlation spectroscopy, it was demonstrated that the compounds tested here were capable of forming stable complexes with plasmid DNA and, particularly, strong DNA conformational changes were observed in the presence of petunidin and corresponding glucoside, as well as delphinidin. The results we obtained can be useful in comprehending the anthocyanins therapeutic action as molecular antioxidants and provide a valuable insight into their mechanism of action.
In solid tumors, hypoxia (lack of oxygen) is developed, which leads to the development of resistance of tumor cells to chemotherapy and radiotherapy through various mechanisms. Nevertheless, hypoxic cells are particularly vulnerable when glycolysis is inhibited. For this reason, in this study, the development of magnetically targetable nanocarriers of the sodium-glucose transporter protein (SGLT2) inhibitor dapagliflozin (DAPA) was developed for the selective delivery of DAPA in tumors. This nanomedicine in combination with radiotherapy or chemotherapy should be useful for effective treatment of hypoxic tumors. The magnetic nanoparticles consisted of a magnetic iron oxide core and a poly(methacrylic acid)-graft-poly(ethyleneglycol methacrylate) (PMAA-g-PEGMA) polymeric shell. The drug (dapagliflozin) molecules were conjugated on the surface of these nanoparticles via in vivo hydrolysable ester bonds. The nanoparticles had an average size of ~ 70 nm and exhibited a DAPA loading capacity 10.75% (w/w) for a theoretical loading 21.68% (w/w). The magnetic responsiveness of the nanoparticles was confirmed with magnetophoresis experiments. The dapagliflozin-loaded magnetic nanoparticles exhibited excellent colloidal stability in aqueous and biological media. Minimal (less than 15% in 24 h) drug release from the nanoparticles occurred in physiological pH 7.4; however, drug release was significantly accelerated in pH 5.5. Drug release was also accelerated (triggered) under the influence of an alternating magnetic field. The DAPA-loaded nanoparticles exhibited higher in vitro anticancer activity (cytotoxicity) against A549 human lung cancer cells than free DAPA. The application of an external magnetic field gradient increased the uptake of nanoparticles by cells, leading to increased cytotoxicity. The results justify further in vivo studies of the suitability of DAPA-loaded magnetic nanoparticles for the treatment of hypoxic tumors.
- MeSH
- benzhydrylové sloučeniny aplikace a dávkování chemie MeSH
- buňky A549 MeSH
- glifloziny MeSH
- glukosidy aplikace a dávkování chemie MeSH
- lidé MeSH
- magnetické nanočástice aplikace a dávkování chemie MeSH
- nádorová hypoxie účinky léků fyziologie MeSH
- nádorové buněčné linie MeSH
- nanomedicína metody MeSH
- nosiče léků aplikace a dávkování chemie MeSH
- systémy cílené aplikace léků metody MeSH
- transportér 2 pro sodík a glukózu MeSH
- uvolňování léčiv MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
Knotweeds (Reynoutria Houtt.) are plants native to the Far East. Japanese knotweed was introduced from Japan to the unsuspecting West by the horticultural activities of Philippe von Siebold via his nursery at Leiden in the 1840s. By 1854, the plant had arrived at the Royal Botanic Gardens in Edinburgh. The plants were then sold by a large number of commercial nursery gardens around the country. Further vegetative spread followed naturally along watercourses. The knotweed is currently extremely persistant invasive plant. There is also an important source of many bioactive substances which could be used in biomedicine. The article discusses biomedically relevant constituents and its pharmacological and toxicological properties.
- Klíčová slova
- křídlatka japonská, polydatin,
- MeSH
- antiflogistika nesteroidní MeSH
- antikarcinogenní látky MeSH
- antimutagenní látky MeSH
- antioxidancia MeSH
- antitumorózní látky fytogenní MeSH
- fytoterapie MeSH
- glukosidy farmakologie chemie terapeutické užití MeSH
- inhibitory agregace trombocytů MeSH
- inhibitory enzymů MeSH
- kořeny rostlin MeSH
- léčivé rostliny MeSH
- léky rostlinné čínské MeSH
- lidé MeSH
- listy rostlin MeSH
- Polygonaceae MeSH
- resveratrol MeSH
- Reynoutria japonica * MeSH
- rostlinné extrakty MeSH
- stilbeny farmakologie chemie terapeutické užití MeSH
- tradiční čínská medicína * MeSH
- zavlečené druhy MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- práce podpořená grantem MeSH
- přehledy MeSH
A new high-performance liquid chromatography method using fused-core column for fast separation of resveratrol and polydatin has been developed and used for quality control of nutraceuticals with resveratrol and polydatin content. Retention characteristics (log k) were studied under different conditions on C-18, RP-Amide C-18, Phenyl-hexyl, Pentafluorophenyl (F5) and Cyano stationary phases for both compounds. The effect of the volume fraction of acetonitrile on a retention factors log k of resveratrol and polydatin were evaluated. The optimal separation conditions for resveratrol, polydatin and internal standard p-nitrophenol were found on the fused-core column Ascentis Express ES-Cyano (100×3.0mm), particle size 2.7μm, with mobile phase acetonitrile/water solution with 0.5% acetic acid pH 3 (20:80, v/v) at a flow rate of 1.0mL/min and at 60°C. The detection wavelength was set at 305nm. Under the optimal chromatographic conditions, good linearity with regression coefficients in the range (r=0.9992-0.9998; n=10) for both compounds was achieved. Commercial samples of nutraceuticals were extracted with methanol using ultrasound bath for 15min. A 5μL sample volume of the filtered solution was directly injected into the HPLC system. Accuracy of the method defined as a mean recovery was in the range 83.2-107.3% for both nutraceuticals. The intraday method precision was found satisfactory and relative standard deviations of sample analysis were in the range 0.8-4.7%. The developed method has shown high sample throughput during sample preparation process, modern separation approach, and short time (3min) of analysis. The results of study showed that the declared content of resveratrol and polydatin varied widely in different nutraceuticals according the producers (71.50-115.00% of declared content).
- MeSH
- acetonitrily chemie MeSH
- glukosidy chemie MeSH
- indikátory a reagencie chemie MeSH
- nitrofenoly chemie MeSH
- potravní doplňky analýza MeSH
- řízení kvality MeSH
- roztoky chemie MeSH
- stilbeny chemie MeSH
- vysokoúčinná kapalinová chromatografie metody MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
The use of a liquid chromatography (LC) splitter inserted between an HPLC column and an evaporative light scattering detector (ELSD) is described. This paper aims to show the feasibility of using the splitter in an HPLC-ELSD system to fractionate a model mixture of analytes, namely salicin (2-(hydroxymethyl)-phenyl-β-d-glucopyranoside) and glucose. The retention factors and efficiency of the separation were studied under various temperatures and water contents in the mobile phase in order to clarify the mechanism of polyols separation on a diol column under the conditions of hydrophilic liquid chromatography (HILIC). Finally, the system was applied to a biological sample (a lyophilized colony gel of Pectinatella magnifica), where the presence of fructose and glucose was confirmed.
Nano-liquid chromatography and conventional HPLC were used for the separation of diastereomers of (+)-catechin-ethyl-malvidin-3-glucoside. Those bridged anthocyanin dyes were obtained by reaction of (+)-catechin with malvidin-3-glucoside in the presence of acetaldehyde. Both diastereomers were isolated with semipreparative chromatography and their structures were confirmed by nuclear magnetic resonance and mass spectrometry. In-laboratory prepared capillary columns packed with fully porous particles Chromosphere C18, dp=3μm, core-shell particles Kinetex C18, dp=2.6μm (100μm i.d.) and monolithic column Chromolith CapRod (100μm i.d.) were used for the separation of (+)-catechin, malvidin-3-glucoside and both diastereomers. Chromosphere C18 stationary phase provided the best chromatographic performance. Mobile phase containing water:acetonitrile (80:20) acidified with trifluoroacetic acid (0.1%, v/v/v) was used in an isocratic elution mode with a flow rate of 360nLmin(-1). Separation of studied compounds was achieved in less than 7min under optimized conditions. The nano-liquid chromatographic method and a conventional HPLC one using the same fully porous particles (Chromosphere C18, 3μm, 100mm×4.6mm) were compared providing higher separation efficiency with the first analytical method and similar selectivity. A better peak symmetry and higher resolution of the studied diastereomers was achieved by conventional chromatography. Nevertheless, nano-liquid chromatography appeared to be useful for the separation of complex anthocyanin dyes and can be utilized for their analysis in plant and food micro-samples. The developed method was used for analysis of red wine grape pomace.
- MeSH
- acetaldehyd chemie MeSH
- acetonitrily chemie MeSH
- analýza potravin metody MeSH
- anthokyaniny chemie MeSH
- glukosidy chemie MeSH
- hmotnostní spektrometrie MeSH
- katechin chemie MeSH
- poréznost MeSH
- Vitis chemie MeSH
- vysokoúčinná kapalinová chromatografie * MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- srovnávací studie MeSH
Enzyme-linked immunosorbent assay (ELISA) represents a bioanalytical strategy frequently used for rapid screening of mycotoxin deoxynivalenol (DON) in cereals and derived products. Due to a considerable affinity of some anti-DON antibodies to structurally similar DON metabolites, such as DON-3-glucoside (DON-3-Glc) and 3-acetyl-DON (3-ADON), a significant overestimation of DON concentrations may occur. A validation study of six commercial DON-dedicated ELISA kits, namely Ridascreen DON, Ridascreen FAST, DON, DON EIA, AgraQuant DON Assay, Veratox 5/5, and Veratox HS was carried out on wheat, barley, and malt matrices. Performance characteristics of all tested ELISAs were determined using aqueous solutions of DON, DON-3-Glc, and 3-ADON analytical standards, further with extracts of artificially spiked blank cereals, and finally with matrix-matched standards of all three compounds. In the final phase, the accuracy of data was assessed through a comparison of DON concentrations determined by particular ELISAs and reference ultra-high-performance liquid chromatography-tandem mass spectrometry method. For this purpose, both quality control materials and a comprehensive set of naturally and artificially contaminated samples of wheat, barley, and malt were analyzed. High cross-reactivities were proved for both DON-3-Glc and 3-ADON in the majority of examined assays, and moreover, a considerable contribution of some matrix components to overestimation of DON results was confirmed.
- MeSH
- artefakty * MeSH
- ELISA normy MeSH
- glukosidy chemie MeSH
- ječmen (rod) chemie mikrobiologie MeSH
- mykotoxiny analýza MeSH
- protilátky chemie MeSH
- pšenice chemie mikrobiologie MeSH
- reagenční diagnostické soupravy normy MeSH
- specificita protilátek MeSH
- tandemová hmotnostní spektrometrie MeSH
- trichotheceny analýza chemie MeSH
- vysokoúčinná kapalinová chromatografie MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
Anthocyanins are plant pigments occurring in flowers and berry fruits. Since a phenomenon of food-drug interactions is increasingly emerging, we examined the effects of 21 major anthocyanins and the extracts from 3 food supplements containing anthocyanins on the aryl hydrocarbon receptor (AhR)-cytochrome P450 CYP1A1 signaling pathway in human hepatocytes and human hepatic HepG2 and intestinal LS174T cancer cells. Pelargonidin-3-O-rutinoside (PEL-2) and cyanidin-3,5-O-diglucoside (CYA-3) dose-dependently activated AhR, as revealed by gene reporter assay. PEL-2 and CYA-3 induced CYP1A1 mRNA but not protein in HepG2 and LS174T cells. Neither compounds induced CYP1A1 mRNA and protein in four different primary human hepatocytes cultures. The effects of PEL-2 and CYA-3 on AhR occurred by ligand-dependent and ligand-independent mechanisms, respectively, as demonstrated by ligand binding assay. In a direct enzyme inhibition assay, none of the antocyanins tested inhibited the CYP1A1 marker activity to less than 50% even at 100 μM concentration. PEL-2 and CYA-3 at 100 μM inhibited CYP1A1 to 79% and 65%, respectively. In conclusion, with exception of PEL-2 and CYA-3, there were no effects of 19 major anthocyanins and 3 food supplements containing anthocyanins on AhR-CYP1A1 signaling, implying zero potential of these compounds for food-drug interactions with respect to AhR-CYP1A1 pathway.
- MeSH
- anthokyaniny chemie toxicita MeSH
- buňky Hep G2 MeSH
- cytochrom P-450 CYP1A1 metabolismus MeSH
- dospělí MeSH
- glukosidy chemie toxicita MeSH
- hepatocyty účinky léků metabolismus MeSH
- inhibitory enzymů toxicita MeSH
- interakce mezi potravou a léky MeSH
- jaterní mikrozomy účinky léků enzymologie MeSH
- lidé středního věku MeSH
- lidé MeSH
- potravní doplňky MeSH
- receptory aromatických uhlovodíků účinky léků metabolismus MeSH
- regulace genové exprese enzymů účinky léků MeSH
- signální transdukce účinky léků MeSH
- vazba proteinů MeSH
- viabilita buněk účinky léků MeSH
- Check Tag
- dospělí MeSH
- lidé středního věku MeSH
- lidé MeSH
- mužské pohlaví MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Research Support, N.I.H., Extramural MeSH
HPLC methods (LC-MS/APCI and chiral HPLC) were used for the identification of astaxanthin derivatives from the red snow alga Chlamydomonas nivalis collected in Austrian Alps, Slovak High Tatra Mountains and Bulgarian Pirin. We observed a striking difference in the composition of astaxanthin optical isomers in C. nivalis collected in geographically distinct regions. Furthermore, algae from the Pirin Mountains differed in the dominance of astaxanthin diglucoside diesters, suggesting an alternative strategy to enhance cell viability at low temperatures.
- MeSH
- Chlamydomonas chemie MeSH
- chromatografie kapalinová * MeSH
- estery chemie MeSH
- glukosidy chemie MeSH
- hmotnostní spektrometrie * MeSH
- molekulární struktura MeSH
- nízká teplota MeSH
- stereoizomerie MeSH
- viabilita buněk MeSH
- xanthofyly chemie MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
Methanolic extract from lyophilized roots of Impatiens glandulifera Royle was analyzed by high performance liquid chromatography using DAD and FLD detection and this revealed one dominant highly fluorescent very unstable substance. The stability of this derivative is strongly dependent on the plant material drying procedure and extraction procedure used. The structure of the substance was established as 1,2,4-trihydroxynaphthalene-1-O-glucoside (THNG) according LC-MS and NMR measurements. When lyophilized plant material was extracted with methanol an almost four times higher amount of THNG was found in the extract, compared to the amount of 2-hydroxy-1,4-naphthoquinone obtained, while in the case of the same lyophilized plant material extracted with water there was no THNG in the extract. The main compounds in this case was 2-hydroxy-1,4-naphthoquinone. In the plant material dried at the laboratory temperature and extracted by methanol there are only traces of THNG.
- MeSH
- glukosidy chemie izolace a purifikace MeSH
- hmotnostní spektrometrie MeSH
- Impatiens chemie MeSH
- kořeny rostlin chemie MeSH
- magnetická rezonanční spektroskopie metody MeSH
- naftoly chemie izolace a purifikace MeSH
- rostlinné extrakty chemie MeSH
- vysokoúčinná kapalinová chromatografie MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
