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1.
Sci Rep ; 11(1): 11657, 2021 06 02.
Artículo en Inglés | MEDLINE | ID: mdl-34079016

RESUMEN

Soapberry (Sapindus mukorossi Gaertn.) is a multi-functional tree with widespread application in toiletries, biomedicine, biomass energy, and landscaping. The pericarp of soapberry can be used as a medicine or detergent. However, there is currently no systematic study on the chemical constituents of soapberry pericarp during fruit development and ripening, and the dynamic changes in these constituents still unclear. In this study, a non-targeted metabolomics approach using ultra-high performance liquid chromatography-high resolution mass spectrometry (UHPLC-HRMS) was used to comprehensively profile the variations in metabolites in the soapberry pericarp at eight fruit growth stages. The metabolome coverage of UHPLC-HRMS on a HILIC column was higher than that of a C18 column. A total of 111 metabolites were putatively annotated. Principal component analysis and hierarchical clustering analysis of pericarp metabolic composition revealed clear metabolic shifts from early (S1-S2) to late (S3-S5) development stages to fruit ripening stages (S6-S8). Furthermore, pairwise comparison identified 57 differential metabolites that were involved in 18 KEGG pathways. Early fruit development stages (S1-S2) were characterized by high levels of key fatty acids, nucleotides, organic acids, and phosphorylated intermediates, whereas fruit ripening stages (S6-S8) were characterized by high contents of bioactive and valuable metabolites, such as troxipide, vorinostat, furamizole, alpha-tocopherol quinone, luteolin, and sucrose. S8 (fully developed and mature stage) was the most suitable stage for fruit harvesting to utilize the pericarp. To the best of our knowledge, this was the first metabolomics study of the soapberry pericarp during whole fruit growth. The results could offer valuable information for harvesting, processing, and application of soapberry pericarp, as well as highlight the metabolites that could mediate the biological activity or properties of this medicinal plant.


Asunto(s)
Frutas/química , Redes y Vías Metabólicas/fisiología , Metaboloma , Metabolómica/métodos , Sapindus/química , Ácidos Carboxílicos/clasificación , Ácidos Carboxílicos/aislamiento & purificación , Ácidos Carboxílicos/metabolismo , Cromatografía Líquida de Alta Presión , Ácidos Grasos/clasificación , Ácidos Grasos/aislamiento & purificación , Ácidos Grasos/metabolismo , Flavonas/clasificación , Flavonas/aislamiento & purificación , Flavonas/metabolismo , Frutas/metabolismo , Nucleótidos/clasificación , Nucleótidos/aislamiento & purificación , Nucleótidos/metabolismo , Análisis de Componente Principal , Quinonas/clasificación , Quinonas/aislamiento & purificación , Quinonas/metabolismo , Sapindus/metabolismo , Saponinas/clasificación , Saponinas/aislamiento & purificación , Saponinas/metabolismo
2.
J Ethnopharmacol ; 279: 114235, 2021 Oct 28.
Artículo en Inglés | MEDLINE | ID: mdl-34044081

RESUMEN

ETHNOPHARMACOLOGICAL RELEVANCE: Trichodesma indicum (L.) R. Br. (family: Boraginaceae) is a medicinal herb largely used to treat arthralgia, rheumatoid arthritis, wound healing, dysentery, etc. It's mechanism of anti-inflammatory activity has not been systematically analyzed yet. AIM OF THE STUDY: The present study was undertaken to examine the anti-inflammatory effects of successive solvent extracts (n-hexane extract (HE), ethyl acetate extract (EA), ethanol extract (EE), aqueous extract (AE) and fractions of HE) from the aerial parts of Trichodesma indicum (TI) against lipopolysaccharide (LPS) stimulated inflammatory reaction using mouse macrophage RAW 264.7 cells. MATERIALS AND METHODS: Cytotoxic effects of the extracts and fractions of TI were assessed by MTT assay. The effect of extracts and fractions on the production of nitric oxide (NO) in RAW 264.7 macrophages were measured using the Griess reagent method. IL - 6, IL - 1ß, TNF-α, iNOS and COX-2 gene expressions were examined by a qRT-PCR method. RESULTS: RAW 264.7 macrophages pretreated with HE, EA, EE and AE of TI showed a significant decrease in the production of proinflammatory cytokines and NO without exhibiting cytotoxicity. The potent HE was fractionated using flash chromatography into FA, FB, FC, FD and FE. Among the five fractions, FE displayed a stronger ability to reduce IL - 1ß, TNF-α, iNOS, COX2 and NO importantly no cytotoxicity was observed. The phytochemical compounds present in FE were further screened by Gas chromatography - Mass spectroscopy (GC-MS). GC-MS analysis revealed that 1,2-benzenedicarboxylic acid diisooctyl ester is the major compound in FE. Molecular docking analysis showed good inhibition of 1,2-benzenedicarboxylic acid diisooctyl ester against TLR-4, NIK and TACE. CONCLUSION: Our results suggested that 1,2-benzenedicarboxylic acid diisooctyl ester could be a potential candidate in alleviating inflammatory reactions in TI.


Asunto(s)
Antiinflamatorios/farmacología , Derivados del Benceno/farmacología , Boraginaceae/química , Ácidos Carboxílicos/farmacología , Ésteres/farmacología , Inflamación/tratamiento farmacológico , Extractos Vegetales/farmacología , Animales , Antiinflamatorios/aislamiento & purificación , Derivados del Benceno/aislamiento & purificación , Derivados del Benceno/uso terapéutico , Ácidos Carboxílicos/aislamiento & purificación , Ácidos Carboxílicos/uso terapéutico , Citocinas/metabolismo , Ésteres/aislamiento & purificación , Ésteres/uso terapéutico , Cromatografía de Gases y Espectrometría de Masas , Inflamación/patología , Lipopolisacáridos , Macrófagos/efectos de los fármacos , Ratones , Simulación del Acoplamiento Molecular , Óxido Nítrico/metabolismo , Células RAW 264.7
3.
Z Naturforsch C J Biosci ; 76(9-10): 347-356, 2021 Sep 27.
Artículo en Inglés | MEDLINE | ID: mdl-33826808

RESUMEN

Lambertianic acid (LA) is a diterpene bioactive compound mainly purified from different species of Pinus. It is an optical isomer of another natural compound daniellic acid and was firstly purified from Pinus lambertiana. LA can be synthesized in laboratory from podocarpic acid. It has been reported to have potential health benefits in attenuating obesity, allergies and different cancers including breast, liver, lung and prostate cancer. It exhibits anticancer properties through inhibiting cancer cell proliferation and survival, and inducing apoptosis, targeting major signalling components including AKT, AMPK, NFkB, COX-2, STAT3, etc. Most of the studies with LA were done using in vitro models, thus warranting future investigations with animal models to evaluate its pharmacological effects such as antidiabetic, anti-inflammatory and neuroprotective effects as well as to explore the underlying molecular mechanisms and toxicological profile. This review describes the chemistry, source, purification and therapeutic potentials of LA and it can therefore be a suitable guideline for any future study with LA.


Asunto(s)
Ácidos Carboxílicos/química , Ácidos Carboxílicos/uso terapéutico , Naftalenos/química , Naftalenos/uso terapéutico , Ácidos Carboxílicos/aislamiento & purificación , Humanos , Hiperlipidemias/tratamiento farmacológico , Hipersensibilidad/tratamiento farmacológico , Naftalenos/aislamiento & purificación , Neoplasias/tratamiento farmacológico , Obesidad/tratamiento farmacológico
4.
Biosci Biotechnol Biochem ; 85(5): 1194-1204, 2021 Apr 24.
Artículo en Inglés | MEDLINE | ID: mdl-33704369

RESUMEN

Papaya (Carica papaya L.) is widely cultivated in tropical and subtropical countries. While ripe fruit is a popular food item globally, the unripe fruit is only consumed in some Asian countries. To promote the utilization of unripe papaya based on the compositional changes of biological active metabolites, we performed liquid chromatography-Orbitrap-mass spectrometry-based analysis to reveal the comprehensive metabolite profile of the peel and pulp of unripe and ripe papaya fruits. The number of peaks annotated as phenolics and aminocarboxylic acids increased in the pulp and peel of ripe fruit, respectively. Putative carpaine derivatives, known alkaloids with cardiovascular effects, decreased, while carpamic acid derivatives increased in the peel of ripe fruit. Furthermore, the functionality of unripe fruit, the benzyl glucosinolate content, total polyphenol content, and proteolytic activity were detectable after heating and powder processing treatments, suggesting a potential utilization in powdered form as functional material.


Asunto(s)
Alcaloides/metabolismo , Ácidos Carboxílicos/metabolismo , Carica/metabolismo , Glucosinolatos/metabolismo , Redes y Vías Metabólicas/fisiología , Polifenoles/metabolismo , Alcaloides/química , Alcaloides/clasificación , Alcaloides/aislamiento & purificación , Ácidos Carboxílicos/química , Ácidos Carboxílicos/clasificación , Ácidos Carboxílicos/aislamiento & purificación , Carica/química , Cromatografía Liquida , Culinaria/métodos , Frutas/química , Frutas/metabolismo , Alimentos Funcionales/análisis , Glucosinolatos/química , Glucosinolatos/clasificación , Glucosinolatos/aislamiento & purificación , Humanos , Extractos Vegetales/química , Polifenoles/química , Polifenoles/clasificación , Polifenoles/aislamiento & purificación , Análisis de Componente Principal , Espectrometría de Masas en Tándem
5.
Molecules ; 26(4)2021 Feb 07.
Artículo en Inglés | MEDLINE | ID: mdl-33562181

RESUMEN

The African weaver ant, Oecophylla longinoda, is used as a biological control agent for the management of pests. The ant has several exocrine glands in the abdomen, including Dufour's, poison, rectal, and sternal glands, which are associated with pheromone secretions for intra-specific communication. Previous studies have analyzed the gland secretions of Dufour's and poison glands. The chemistry of the rectal and sternal glands is unknown. We re-analyzed the secretions from Dufour's and poison glands plus the rectal and sternal glands to compare their chemistries and identify additional components. We used the solid-phase microextraction (SPME) technique to collect gland headspace volatiles and solvent extraction for the secretions. Coupled gas chromatography-mass spectrometry (GC-MS) analysis detected a total of 78 components, of which 62 were being reported for the first time. These additional components included 32 hydrocarbons, 12 carboxylic acids, 5 aldehydes, 3 alcohols, 2 ketones, 4 terpenes, 3 sterols, and 1 benzenoid. The chemistry of Dufour's and poison glands showed a strong overlap and was distinct from that of the rectal and sternal glands. The different gland mixtures may contribute to the different physiological and behavioral functions in this ant species.


Asunto(s)
Hormigas/química , Glándulas Exocrinas/química , Control Biológico de Vectores , Abdomen , Alcoholes/química , Alcoholes/aislamiento & purificación , Aldehídos/química , Aldehídos/aislamiento & purificación , Animales , Hormigas/metabolismo , Ácidos Carboxílicos/química , Ácidos Carboxílicos/aislamiento & purificación , Cromatografía de Gases y Espectrometría de Masas , Hidrocarburos/química , Hidrocarburos/aislamiento & purificación , Cetonas/química , Cetonas/aislamiento & purificación , Feromonas/biosíntesis , Feromonas/química , Feromonas/aislamiento & purificación , Microextracción en Fase Sólida , Esteroles/química , Esteroles/aislamiento & purificación , Terpenos/química , Terpenos/aislamiento & purificación
6.
Biomed Chromatogr ; 35(2): e4969, 2021 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-32845527

RESUMEN

A new approach to the quantitative analysis of aromatic metabolites in cerebrospinal fluid samples of neurosurgical patients based on microextraction by packed sorbent coupled with derivatization and GC-MS was developed. Analytical characteristics such as recoveries (40-90%), limit of detection (0.1-0.3 µm) and limit of quantitation (0.4-0.7 µm) values, accuracy (<±20%), precision (<20%) and linear correlations (R2 ≥ 0.99) over a 0.4-10 µm range of concentrations demonstrated that microextraction by packed sorbent provides results for the quantitative analysis of target compounds comparable with those for liquid-liquid extraction. Similar results were achieved using 40 µl of sample for microextraction by packed sorbent instead of 200 µl for liquid-liquid extraction. Benzoic, 3-phenylpropionic, 3-phenyllactic, 4-hydroxybenzoic, 2-(4-hydroxyphenyl)acetic, homovanillic and 3-(4-hydroxyphenyl)lactic acids were found in cerebrospinal fluid samples (n = 138) of neurosurgical patients in lower concentrations than in serum samples (n = 110) of critically ill patients. Analysis of the cerebrospinal fluid and serum samples taken at the same time from neurosurgical patients (n = 5) revealed similar results for patients without infection and multidirectional results for patients with central nervous system infection. Our preliminary results demonstrate the necessity of further evaluating the aromatic compound profile in cerebrospinal fluid for its subsequent verification for potential diagnostic markers.


Asunto(s)
Ácidos Carboxílicos/líquido cefalorraquídeo , Ácidos Carboxílicos/metabolismo , Cromatografía de Gases y Espectrometría de Masas/métodos , Extracción Líquido-Líquido/métodos , Adulto , Ácidos Carboxílicos/química , Ácidos Carboxílicos/aislamiento & purificación , Femenino , Humanos , Límite de Detección , Modelos Lineales , Masculino , Persona de Mediana Edad , Reproducibilidad de los Resultados
7.
Food Chem ; 345: 128749, 2021 May 30.
Artículo en Inglés | MEDLINE | ID: mdl-33302110

RESUMEN

The development of sensitive method for analysis ofpesticide residue is of great significance to ensure food safety and promote globalization of food trade. An original method was proposed for analysis of phenoxy carboxylic acids (PCAs) pesticide in plant-derived food. To concentrate trace PCAs, the TAPT-DHTA-COF was fabricated by a facile room-temperature method and utilized as the solid phase extraction cartridge packing. The TAPT-DHTA-COF exhibited excellent adsorption capacity and recyclability towards PCAs. Theoretical simulation indicated that the adsorption of PCAs onto the TAPT-DHTA-COF was driven by hydrogen bond, halogen bond and π-π interaction. Using liquid chromatography tandem mass spectrometry for detection, good linearity ranged from 0.10 to 40 ng·g-1 and low limits of detection varied from 0.007 to 0.030 ng·g-1 were achieved for PCAs in rice, apple and greengrocery. The recoveries of PCAs from the spiked samples ranged from 81.2% to 107%. The reliability was verified by the accurate determination of certified reference materials.


Asunto(s)
Ácidos Carboxílicos/análisis , Análisis de los Alimentos/métodos , Contaminación de Alimentos/análisis , Radical Hidroxilo/química , Estructuras Metalorgánicas/química , Residuos de Plaguicidas/análisis , Plantas Comestibles/química , Adsorción , Ácidos Carboxílicos/química , Ácidos Carboxílicos/aislamiento & purificación , Cromatografía Liquida , Límite de Detección , Residuos de Plaguicidas/química , Residuos de Plaguicidas/aislamiento & purificación , Reproducibilidad de los Resultados , Extracción en Fase Sólida , Espectrometría de Masas en Tándem
8.
Molecules ; 25(23)2020 Nov 24.
Artículo en Inglés | MEDLINE | ID: mdl-33255301

RESUMEN

In our ongoing search for new bioactive fungal metabolites, four previously undescribed oxazole carboxylic acid derivatives (1-4) for which we proposed the trivial names macrooxazoles A-D together with two known tetramic acids (5-6) were isolated from the plant pathogenic fungus Phoma macrostoma. Their structures were elucidated based on high-resolution mass spectrometry (HR-MS) and nuclear magnetic resonance (NMR) spectroscopy. The hitherto unclear structure of macrocidin Z (6) was also confirmed by its first total synthesis. The isolated compounds were evaluated for their antimicrobial activities against a panel of bacteria and fungi. Cytotoxic and anti-biofilm activities of the isolates are also reported herein. The new compound 3 exhibited weak-to-moderate antimicrobial activity as well as the known macrocidins 5 and 6. Only the mixture of compounds 2 and 4 (ratio 1:2) showed weak cytotoxic activity against the tested cancer cell lines with an IC50 of 23 µg/mL. Moreover, the new compounds 2 and 3, as well as the known compounds 5 and 6, interfered with the biofilm formation of Staphylococcus aureus, inhibiting 65%, 75%, 79%, and 76% of biofilm at 250 µg/mL, respectively. Compounds 5 and 6 also exhibited moderate activity against S. aureus preformed biofilm with the highest inhibition percentage of 75% and 73% at 250 µg/mL, respectively.


Asunto(s)
Ácidos Carboxílicos/química , Oxazoles/química , Phoma/química , Antiinfecciosos/química , Antiinfecciosos/aislamiento & purificación , Antiinfecciosos/farmacología , Biopelículas/efectos de los fármacos , Ácidos Carboxílicos/aislamiento & purificación , Ácidos Carboxílicos/farmacología , Humanos , Espectroscopía de Resonancia Magnética , Pruebas de Sensibilidad Microbiana , Conformación Molecular , Estructura Molecular , Phoma/metabolismo , Enfermedades de las Plantas/microbiología , Metabolismo Secundario , Staphylococcus aureus/efectos de los fármacos , Relación Estructura-Actividad
9.
J Nat Prod ; 83(12): 3606-3613, 2020 12 24.
Artículo en Inglés | MEDLINE | ID: mdl-33314934

RESUMEN

Ten novel (1, 2, 3a, 3b, 4a, 4b, 5a, 5b, 6a, and 6b) furancarboxylic acids including four pairs of epimers (3a, 3b; 4a, 4b; 5a, 5b; 6a, 6b), together with seven known analogues (7a, 7b, 8a, 8b, 9a, 9b, and 10), were isolated from the fermentation of the soil-derived fungus Penicillium sp. sb62. Their structures were established on the basis of spectroscopic data analysis, and the absolute configurations were determined by time-dependent density functional theory electronic circular dichroism calculations, comparison of the specific optical rotation values, and modified Mosher's method. Compounds 1-4 represent the first class of natural furancarboxylic acids featuring a thiophene moiety. Compounds 1-7 showed antimicrobial inhibitory activities against Escherichia coli, Staphylococcus aureus, and Candida albicans with MIC values ranging from 0.9 to 7.0 µg/mL, from 1.7 to 3.5 µg/mL, and from 3.3 to 7.0 µg/mL, respectively.


Asunto(s)
Antiinfecciosos/aislamiento & purificación , Ácidos Carboxílicos/aislamiento & purificación , Penicillium/química , Antiinfecciosos/química , Antiinfecciosos/farmacología , Candida albicans/efectos de los fármacos , Ácidos Carboxílicos/química , Escherichia coli/efectos de los fármacos , Espectroscopía de Resonancia Magnética , Pruebas de Sensibilidad Microbiana , Estructura Molecular , Staphylococcus aureus/efectos de los fármacos
10.
Food Chem ; 333: 127540, 2020 Dec 15.
Artículo en Inglés | MEDLINE | ID: mdl-32682226

RESUMEN

A novel of magnetic dummy-template molecularly imprinted polymers (mag-MWCNTs-DMIPs) were prepared by surface molecular imprinting technique. The structure of polymers were characterized and the binding properties were assessed by adsorption experiments. The synthetic mag-MWCNTs-DMIPs exhibit satisfying adsorption capacity, excellent selectivity and fast adsorption rate toward phenoxy carboxylic acid (PCA) herbicides. Afterwards, a reliable analytical method for selective separation and determination of trace PCA herbicides in cereals was established by using magnetic solid-phase extraction (mag-MWCNTs-DMIPs as magnetic adsorbent) and UPLC-MS/MS detection. A series of requisite factors were optimized in detail to achieve expected extraction performance. Under the optimum MSPE parameters, the mean spiked recoveries for analytes in different cereals ranged from 86.7% to 95.2% with intra- and inter-day precision not greater than 8.5% and 10.6%, respectively. At last, the developed method was successfully utilized for determination the four PCA herbicides in actual cereals.


Asunto(s)
Ácidos Carboxílicos/análisis , Ácidos Carboxílicos/aislamiento & purificación , Grano Comestible/química , Herbicidas/química , Impresión Molecular , Nanotubos de Carbono/química , Extracción en Fase Sólida/métodos , Adsorción , Ácidos Carboxílicos/química , Contaminación de Alimentos/análisis , Imanes/química , Polímeros/síntesis química , Polímeros/química , Factores de Tiempo
11.
J Chromatogr A ; 1621: 461066, 2020 Jun 21.
Artículo en Inglés | MEDLINE | ID: mdl-32299623

RESUMEN

The ion-exchange and complex forming equilibria were quantitatively described and demonstrated in order to understand major factors in the control of selectivity in the analytical separation of carboxylic acids and inorganic anions in cryptand based ion chromatography. A complex retention model has been developed for the separation on a non-conventional IC column. Changes in retention are treated both theoretically and experimentally. Retention mechanism is employed on a macrocycle-based (cryptand n-decyl-[2.2.2]) ion-exchange chromatographic phase to improve the selectivity for a mixture of model analytes. We introduced an alternative internal gradient method by mixed eluent (i.e. eluents formed by combination of two alkali hydroxide with different molar ratio). The effect of binary mixed eluent (Li/Na, Li/K) on the retention behavior and peak shape of carboxylic acids are also discussed in view of the proposed theory. It was shown that the effects of binary aqueous mobile phases, held isocratically behave very similar to the step gradient mode. The "internal gradient" separation system has advantages over traditional step gradient mode. Twenty-six anions of widely varying chemical character (mono-, di-, tri-valent inorganic anions, mono-, di-, tri-valent aliphatic carboxylic acids, aromatic- and haloacetic carboxylic acids) were investigated on the cryptand-based (D222) stationary phase using different methods by LiOH, NaOH and KOH eluent. The predicted vs measured retention data are in rather good agreement. High degree of linearity was obtained for inorganic anions, multivalent carboxylic acids, and for aromatic and haloacetic acids R2 = 0.992, 0.969, and 0.980, respectively.


Asunto(s)
Ácidos Carboxílicos/análisis , Cromatografía por Intercambio Iónico/métodos , Éteres Cíclicos/química , Bases de Schiff/química , Ácidos/química , Aniones/química , Ácidos Carboxílicos/aislamiento & purificación , Intercambio Iónico
12.
J Nat Prod ; 83(4): 985-995, 2020 04 24.
Artículo en Inglés | MEDLINE | ID: mdl-32141299

RESUMEN

Twenty new chebulic acid and brevifolincarboxylic acid derivatives, including eight optically pure or achiral compounds (1-7 and 14) and six pairs of enantiomers (8a/8b-13a/13b), along with nine known analogues (15-23), were isolated from an EtOH extract of the aerial parts of Euphorbia hirta. The absolute configurations of the new compounds were assigned based on single-crystal X-ray diffraction analysis and comparison of the experimental and calculated ECD data. Racemic or scalemic mixtures of 8-13 were isolated, and their enantiomers were analyzed by chiral-phase HPLC-ECD measurements. Compound 12 possesses an unprecedented 2H-cyclopenta[de]chromene-2,5(4H)-dione scaffold. Compounds 12, 20, and 23 displayed moderate inhibitory effects against lipopolysaccharide-induced nitric oxide production in BV-2 microglial cells, while all the isolates exhibited significant DPPH radical scavenging activities with EC50 values of 2.2-15.8 µM.


Asunto(s)
Benzopiranos/química , Benzopiranos/farmacología , Euphorbia/química , Benzopiranos/aislamiento & purificación , Ácidos Carboxílicos/química , Ácidos Carboxílicos/aislamiento & purificación , Ácidos Carboxílicos/farmacología , Línea Celular , Supervivencia Celular/efectos de los fármacos , Cromatografía Líquida de Alta Presión , Dicroismo Circular , Depuradores de Radicales Libres/farmacología , Humanos , Lipopolisacáridos , Estructura Molecular , Óxido Nítrico/antagonistas & inhibidores , Componentes Aéreos de las Plantas/química , Extractos Vegetales/química , Extractos Vegetales/farmacología , Estereoisomerismo , Difracción de Rayos X
13.
Curr Pharm Des ; 26(6): 650-663, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-31878850

RESUMEN

Carboxylic acids are an important natural component as a final product or intermediates for syntheses. They are produced in plants, animals and also as products from biotechnological processes. This review presents the use of single hydroxide particles and layered double hydroxides as alternative adsorbents to remove carboxylic acids from liquid media. The proposal to use hydroxide particles is based on its affinity to adsorb or intercalate carboxylic acids. Besides, the change in properties of the adsorbate-sorbate product evinces that this intermediate can be used as a vehicle to transport and release carboxylic acids. Additional examples will also be presented to prove that layered hydroxides are capable of removing non-ionic compounds from wine, milk and tomato. The use of layered compounds to remove active ingredients could reduce the number of separations steps, costs and reduce or eliminate solvents, thus encouraging the design of industrial processes of separation using hydroxides particles.


Asunto(s)
Ácidos Carboxílicos/aislamiento & purificación , Hidróxidos/química , Adsorción
14.
Electrophoresis ; 40(18-19): 2390-2397, 2019 09.
Artículo en Inglés | MEDLINE | ID: mdl-31218732

RESUMEN

In this article, optimization of BGE for simultaneous separation of inorganic ions, organic acids, and glutathione using dual C4 D-LIF detection in capillary electrophoresis is presented. The optimized BGE consisted of 30 mM 2-[4-(2-hydroxyethyl)piperazin-1-yl]ethanesulfonic acid, 15 mM 2-amino-2-hydroxymethyl-propane-1,3-diol, and 2 mM 18-crown-6 at pH 7.2 and allowed simultaneous separation of ten inorganic anions and cations, three organic acids and glutathione in 20 min. The samples were injected hydrodynamically from both capillary ends using the double-opposite end injection principle. Sensitive detection of anions, cations, and organic acids with micromolar LODs using C4 D and simultaneously glutathione with nanomolar LODs using LIF was achieved in a single run. The developed BGE may be useful in analyses of biological samples containing analytes with differing concentrations of several orders of magnitude that is not possible with single detection mode.


Asunto(s)
Electroforesis Capilar/métodos , Espectrometría de Fluorescencia/métodos , Pruebas Respiratorias/métodos , Ácidos Carboxílicos/análisis , Ácidos Carboxílicos/aislamiento & purificación , Conductividad Eléctrica , Diseño de Equipo , Glutatión/análisis , Glutatión/aislamiento & purificación , Humanos , Iones/análisis , Iones/aislamiento & purificación , Límite de Detección , Modelos Lineales , Reproducibilidad de los Resultados , Lágrimas/química
15.
Free Radic Biol Med ; 144: 183-191, 2019 11 20.
Artículo en Inglés | MEDLINE | ID: mdl-31095999

RESUMEN

Cardiolipins (CL) are anionic dimeric phospholipids bearing four fatty acids, found in inner mitochondrial membrane as structural components and are involved in several processes as oxidative phosphorylation or apoptotic signalling. As other phospholipids, CL can be modified by reactive oxygen species (ROS) and reactive nitrogen species (RNS), which can modulate various cellular functions. Modifications of CL by RNS remain largely unstudied although other nitrated lipids are emerging as bioactive molecules. In this work, we developed a C30-LC-HRMS/MS methodology to identify the nitrated and nitroxidized tetralinoleoyl-cardiolipin (TLCL), using a biomimetic model of nitration, and to disclose specific fragmentation pathways under HCD MS/MS. Using this lipidomics approach, we were able to separate and identify nitro, nitroso, nitronitroso, and nitroxidized TLCL derivatives, comprising 11 different nitrated compounds. These products were identified using accurate mass measurements and the fragmentation pattern acquired in higher-energy collision dissociation (HCD)-tandem MS/MS experiments. These spectra showed classifying fragmentation pathways, yielding phosphatidic acid (PA-), lysophosphatidic acid (LPA-), and carboxylate fragment ions with the modifying moiety. Remarkably, the typical neutral losses associated with the added moieties were not observed. In conclusion, this work has developed a new method for the identification of nitroso, nitrated and nitroxidized cardiolipin products by using a C30LC-MS platform method, potentially allowing their detection in biological samples.


Asunto(s)
Cardiolipinas/química , Lipidómica/métodos , Nitratos/química , Óxidos de Nitrógeno/química , Compuestos Nitrosos/química , Especies de Nitrógeno Reactivo/química , Ácidos Carboxílicos/química , Ácidos Carboxílicos/aislamiento & purificación , Cardiolipinas/aislamiento & purificación , Cromatografía Liquida , Humanos , Lisofosfolípidos/química , Lisofosfolípidos/aislamiento & purificación , Compuestos Nitrosos/aislamiento & purificación , Ácidos Fosfatidicos/química , Ácidos Fosfatidicos/aislamiento & purificación , Soluciones , Espectrometría de Masas en Tándem/métodos
16.
J Chromatogr A ; 1602: 150-159, 2019 Sep 27.
Artículo en Inglés | MEDLINE | ID: mdl-30961967

RESUMEN

A rapid and effective method was successfully established for the extraction and determination of chlorogenic acid, protocatechuic acid, malic acid, caffeic acid and gallic acid in fruit (chaenomeles speciosa) via matrix solid-phase dispersion (MSPD) microextraction combined with ultra-high performance liquid chromatography with quadrupole time-of-flight tandem mass spectrometry (UHPLC-Q-TOF/MS). Several major extraction parameters were investigated and optimized, such as the type of sorbent, the amount of sorbent, the grinding time, the type and concentration of the eluting solvent. The optimal extraction conditions were obtained by using 20 mg of calix[8]arene as dispersing adsorbent, selecting 60 s as the appropriate grinding time and applying 250 mM of 1-dodecyl-3-methylimidazolium bromide as eluent solvent. Moreover, the calibration curves of the analytes were in the range of 0.01-500 µg/mL with the determination coefficients (r2) higher than 0.9995. The limits of detection and limits of quantification were in the range of 0.202-1.056 ng/mL and 0.674-3.521 ng/mL, respectively. The recoveries of the target compounds at two spiked levels were between 82.19 and 113.36%. Furthermore, this method had acceptable reproducibility (RSD ≤ 3.84%). The proposed approach combined the advantages of MSPD microextraction with UHPLC-Q-TOF/MS, and could be applicable for the analysis organic acids in fruit.


Asunto(s)
Calixarenos/química , Ácidos Carboxílicos/aislamiento & purificación , Frutas/química , Líquidos Iónicos/química , Microextracción en Fase Sólida/métodos , Adsorción , Iones/análisis , Límite de Detección , Modelos Lineales , Estándares de Referencia , Reproducibilidad de los Resultados , Solventes/química , Espectrometría de Masas en Tándem , Factores de Tiempo
17.
Org Biomol Chem ; 17(6): 1466-1470, 2019 02 06.
Artículo en Inglés | MEDLINE | ID: mdl-30672950

RESUMEN

Actinomycin D (Act-D) is a biologically important polypeptide antibiotic clinically used to treat several malignant tumors. Herein, we extended its hitherto-unexplored application as an applicable chiral solvating agent (CSA) for the rapid enantiomeric determination of different chiral carboxylic acids in deuterated chloroform by 1H NMR spectroscopy. Notable enantiodiscrimination with well-splitting α-H or α-CH3 resonance signals of the enantiomers of carboxylic acids were achieved without significant interference from Act-D. To check its applicability for the determination of enantiomeric excess (ee) values, various mandelic acid (MA) samples were determined and compared with the observed ones, resulting in an excellent linear relationship. To our knowledge, this is the first example of using a natural antibiotic compound as a CSA to achieve chiral recognition for carboxylic acids.


Asunto(s)
Ácidos Carboxílicos/química , Dactinomicina/química , Espectroscopía de Resonancia Magnética/métodos , Solventes/química , Ácidos Carboxílicos/aislamiento & purificación , Estereoisomerismo
18.
Chemosphere ; 214: 511-518, 2019 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-30286420

RESUMEN

In this study, activated petroleum coke (APC) and commercial activated carbon (CAC) were used in a continuous adsorption column for removal of model naphthenic acids and organics from real oil sands process-affected water (OSPW). Diphenylacetic acid and 2-naphthoic acid, two model naphthenic acid (NA) compounds, were removed completely by the APC in a continuous column operation. Due to the complex nature of organics in OSPW, total organic carbon (TOC) was measured to determine the effectiveness of OSPW treatment by APC. The removal of TOC from OSPW at its natural pH 8 by APC was only 25%, whereas acidification at pH 4 followed by APC adsorption removed 96% of the initial TOC. When compared to a commercial activated carbon, the APC showed an average of 20% higher organics removal. The experimental breakthrough curves were better fitted by Thomas model in comparison to Adams-Bohart and Yoon-Nelson models. The regeneration of APC was conducted using methanol with 0.01 wt% NaOH (pH = 11.7) and a total of four cycles of adsorption and regeneration were conducted with marginal loss of adsorption sites.


Asunto(s)
Carbono/química , Ácidos Carboxílicos/aislamiento & purificación , Yacimiento de Petróleo y Gas/química , Contaminantes Químicos del Agua/aislamiento & purificación , Purificación del Agua/métodos , Adsorción , Ácidos Carboxílicos/metabolismo , Contaminantes Químicos del Agua/metabolismo
19.
Chemosphere ; 214: 158-167, 2019 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-30265922

RESUMEN

Adsorption of a diverse set of chemicals onto goethite was evaluated by column chromatography. The pH of the effluents was 4.7-5.2. Van der Waals forces dominate the exothermic adsorption of 8 nonpolar compounds (e.g., PAHs and chlorobenzenes). H-bonding is responsible for the adsorption of 32 monocarboxylic acids (i.e., benzoic acids, naphthoic acids and acidic pharmaceuticals) and their adsorption tends to be endothermic. Steric effects significantly decreased the bonding of monocarboxylic acids with ortho-substitutions. Exothermic adsorption of 10 monophenols is controlled by weak H-bonding. Bonding of these 50 solutes onto goethite is totally reversible. In contrast, inner-sphere complexation of phthalic acid and chlortetracycline with goethite occurred according to their low desorption ratio (1.1%-54.4%). Polyparameter linear free energy relationship (PP-LFER) models were established to provide acceptable fitting results of the goethite-solute distribution coefficients (RMSE = 0.32 and 0.30 at 25 °C and 5 °C, respectively). It is worthy to note that steric effects must be considered to get a better prediction for compounds with ortho-substitutions.


Asunto(s)
Adsorción , Compuestos de Hierro/química , Minerales/química , Ácidos Carboxílicos/aislamiento & purificación , Cromatografía , Concentración de Iones de Hidrógeno , Interacciones Hidrofóbicas e Hidrofílicas , Fenoles/aislamiento & purificación , Termodinámica
20.
Comput Biol Chem ; 78: 242-259, 2019 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-30584950

RESUMEN

Anethum sowa L. has been used as a spice herb in the Asian and European culinary systems to add flavour and taste. The studied plant has diverse folkloric medicinal value. Present study was designed to isolate phytochemicals from the hexane, chloroform and ethyl acetate extracts of the roots by various chromatographic techniques. Based on spectral analysis (IR, LC-MS, NMR) the isolated compounds were identified as physcione (1), ß-sitosterol (2), stigmasterol (3), 2-oxo-3-propyl-2H-chromene-7-carboxylic acid (4), bergapten (5), 3-ethyl-7-hydroxy-2H-chromen-2-one (6) and graveolone (7). The mentioned compounds have been isolated for the first time from the roots part of the plant. Based on extensive literature review, physcione and bergapten were inferred to exhibit crucial bioactivities including inhibitory efficacy against various forms of cancer. Accordingly, in the present research approach molecular docking investigations of the isolated phytochemicals have been robustly executed with different oncogenes that have been reported to be actively involved in various forms of carcinoma. In silico investigations encompassing molecular docking analysis and drug-likeness profiling was executed to estimate the potential therapeutic tendencies of the phytochemicals targeted towards effective cancer therapy. Current investigation offers meaningful know-how pertaining to potential anticancer activities of the phytochemicals extracted from the roots of Anethum sowa L. and might open up new revenues towards effective drug development against cancer.


Asunto(s)
Antineoplásicos Fitogénicos/farmacología , Apiaceae/química , Simulación del Acoplamiento Molecular , Extractos Vegetales/farmacología , Raíces de Plantas/química , 5-Metoxipsoraleno/química , 5-Metoxipsoraleno/aislamiento & purificación , 5-Metoxipsoraleno/farmacología , Antineoplásicos Fitogénicos/química , Antineoplásicos Fitogénicos/aislamiento & purificación , Benzopiranos/química , Benzopiranos/aislamiento & purificación , Benzopiranos/farmacología , Ácidos Carboxílicos/química , Ácidos Carboxílicos/aislamiento & purificación , Ácidos Carboxílicos/farmacología , Proliferación Celular/efectos de los fármacos , Ensayos de Selección de Medicamentos Antitumorales , Humanos , Metoxaleno/análogos & derivados , Metoxaleno/química , Metoxaleno/aislamiento & purificación , Metoxaleno/farmacología , Extractos Vegetales/química , Extractos Vegetales/aislamiento & purificación , Sitoesteroles/química , Sitoesteroles/aislamiento & purificación , Sitoesteroles/farmacología , Estigmasterol/química , Estigmasterol/aislamiento & purificación , Estigmasterol/farmacología
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