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1.
Planta Med ; 82(4): 356-61, 2016 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-26669677

RESUMEN

A reversed-phase high-performance liquid chromatography method was developed for the chemical fingerprinting of Commiphora wightii gum resin (guggul). This method was also used for the quantification of E- and Z-guggulsterones in different C. wightii gum resin samples. The analysis was conducted on a high-performance liquid chromatography system with a reversed-phase column using a gradient elution comprised of water and acetonitrile with 0.1% acetic acid, and a run time of 50 min at 38 °C. The calibration curve of E- and Z-guggulsterones showed good linearity with a standard correlation coefficient >0.999, which is within the established range (0.5-250 µg/mL). Twelve marker compounds were selected and successfully analyzed by this method in 22 C. wightii gum resin samples along with 9 gum resin samples of possible adulterant species.


Asunto(s)
Cromatografía Líquida de Alta Presión/métodos , Commiphora/química , Pregnenodionas/análisis , Resinas de Plantas/química
2.
J AOAC Int ; 98(3): 757-759, 2015.
Artículo en Inglés | MEDLINE | ID: mdl-26086254

RESUMEN

The central nervous system stimulant 1,3-dimethylamylamine (DMAA) has been found in preworkout products and dietary supplements. A fast direct analysis in real time-quadrupole time of flight-MS method was used for identification of DMAA in dietary supplements and to determine if this compound is present in geranium (Pelargonium graveolens) plants or oil. This method involved the use of [M+H]+ ions in the positive mode based on the exact mass of DMAA. The results of this investigation showed that DMAA was not detected from authentic samples of P. graveolens plant material or pelargonium oil or in multiple samples of commercially available pelargonium oil. DMAA was detected in three samples of dietary supplements. The LOD of DMAA was found to be 10 ng/mL.


Asunto(s)
Aminas/análisis , Suplementos Dietéticos/análisis , Geranium/química , Límite de Detección , Espectrometría de Masas , Aceites de Plantas/análisis , Plantas/química , Reproducibilidad de los Resultados
3.
J AOAC Int ; 98(1): 13-21, 2015.
Artículo en Inglés | MEDLINE | ID: mdl-25857873

RESUMEN

Alkaloids have been reported to be the major physiologically active constituents in Mitragyna. An analytical method was developed to provide an alternative, fast method for characterization of alkaloids from various M. speciosa samples. The separation was achieved using an RP octylsilyl (C8) column, MS detection, and a water-acetonitrile with formic acid gradient as the mobile phase. Ultra-HPLC/quadrupole time-of-flight MS analysis and characterization were performed on 12 corynanthe-type indole/oxindole alkaloids obtained from the leaves of M. speciosa Korth. The indoles and oxindoles had an open E ring with or without substitution occurring at the C9 position. The full single mass spectrum of alkaloids showed a strong signal for the protonated molecule [M+H]+. The product ion spectrum of mitragynine type of alkaloids showed strong response at m/z=174.0901 suggestive of an ion containing an odd number of nitrogen atoms corresponding to formula C11H12NO, which is characteristic of indole alkaloids. A multivariate statistical analysis technique, principal component analysis, was used to show discrimination between the M. speciosa samples. The results indicated that the analytical method is suitable for QC testing of various Mitragyna commercial samples and can be used to evaluate market products purported to contain M. speciosa.


Asunto(s)
Alcaloides/química , Cromatografía Liquida/métodos , Indoles/química , Espectrometría de Masas/métodos , Mitragyna/química , Estructura Molecular , Oxindoles , Hojas de la Planta/química
4.
Artículo en Inglés | MEDLINE | ID: mdl-25421162

RESUMEN

The use of cinnamon as a spice and flavouring agent is widespread throughout the world. Many different species of plants are commonly referred to as 'cinnamon'. 'True cinnamon' refers to the dried inner bark of Cinnamomum verum J. S. Presl (syn. C. zeylanicum) (Lauraceae). Other 'cinnamon' species, C. cassia (Nees & T. Nees) J. Presl (syn. C. aromaticum Nees) (Chinese cassia), C. loureiroi Nees (Saigon cassia), and C. burmannii (Nees & T. Nees) Blume (Indonesian cassia), commonly known as cassia, are also marketed as cinnamon. Since there is a prevalence of these various types of 'cinnamons' on the market, there is a need to develop a rapid technique that can readily differentiate between true cinnamon (C. verum) and other commonly marketed species. In the present study, coumarin and other marker compounds indicative of 'cinnamon' were analysed using DART-QToF-MS in various samples of cinnamon. This method involved the use of [M + H](+) ions in positive mode in addition to principal component analysis (PCA) using Mass Profiler Professional software to visualise several samples for quality and to discriminate 'true cinnamon' from other Cinnamomum species using the accurate mass capabilities of QToF-MS.


Asunto(s)
Cinnamomum aromaticum/clasificación , Cinnamomum zeylanicum/clasificación , Cinnamomum/clasificación , Aromatizantes/química , Especias/análisis , Acroleína/análogos & derivados , Acroleína/análisis , Cinamatos/análisis , Cinnamomum/química , Cinnamomum aromaticum/química , Cinnamomum zeylanicum/química , Cumarinas/análisis , Análisis de Componente Principal , Sesquiterpenos/análisis , Espectrometría de Masa por Láser de Matriz Asistida de Ionización Desorción/métodos
5.
J Nat Med ; 68(4): 686-98, 2014 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-24928704

RESUMEN

The edible tubers from different species of Dioscorea are a major source of food and nutrition for millions of people. Some of the species are medicinally important but others are toxic. The genus consists of about 630 species of almost wholly dioecious plants, many of them poorly characterized. The taxonomy of Dioscorea is confusing and identification of the species is generally problematic. There are no adequate anatomical studies available for most of the species. This study is aimed to fill this gap and provides a detailed investigation of the anatomy and micro-morphology of the rhizomes and tubers of five different species of Dioscorea, namely D. balcanica, D. bulbifera, D. polystachya, D. rotundata and D. villosa. The primary features that can help in distinguishing the species include the nature of periderm, presence or absence of pericyclic sclereids, lignification in the phloem, types of calcium oxalate crystals and features of starch grains. The descriptions are supported with images of bright-field and scanning electron microscopy for better understanding of these species. The diagnostic key of anatomical features included in this paper can help distinguish the investigated species unambiguously. Additionally, HPTLC analyses of authentic and commercial samples of the five species are described.


Asunto(s)
Dioscorea/anatomía & histología , Dioscorea/química , Cromatografía en Capa Delgada , Dioscorea/clasificación , Dioscorea/ultraestructura , Tubérculos de la Planta/anatomía & histología , Tubérculos de la Planta/química , Tubérculos de la Planta/clasificación , Tubérculos de la Planta/ultraestructura
6.
Planta Med ; 80(4): 321-9, 2014 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-24510365

RESUMEN

Yam (Dioscorea spp.) is an important edible tuber plant used for medicinal purposes to promote health and longevity in Chinese tradition. Steroidal saponins were reported to be the major physiologically active constituents in yams. In this current work, the structural characteristics of steroidal saponins in methanolic extracts from dried rhizomes of two Dioscorea species (D. villosa L. and D. cayenensis Lam.) and dietary supplements have been identified and analyzed using UHPLC/QTOF-MS in both negative and positive ion modes. The fragmentation patterns of reference standards were determined and the steroidal saponins in the extracts were identified or tentatively characterized from their retention times and mass spectra. The fragments produced by collision-induced dissociation (CID) revealed the characteristic cleavage of glycosidic bonds, and the fragmentation pattern provided structural information about the sugars. Twenty-one saponins, including four tentatively identified compounds, were detected in the crude extracts of two Dioscorea species. These saponins can be used to distinguish D. villosa from D. cayenensis. For example, asperin and gracillin are found only in D. cayenensis, and dioscoreavilloside A and B and parvifloside are only found in D. villosa. This can be used to determine the presence or absence of D. villosa in commercial products, which may help determine the spiking of plant material, and/or prevent the use of potentially mislabeled or misidentified "Dioscorea" material. The analytical method also provided an alternative, fast method for quality control of Dioscorea species in dietary supplements. Principal component analysis showed that Dioscorea species and commercial products were easily distinguished. From this a partial least squares model was constructed to determine what species are in different products.


Asunto(s)
Dioscorea/química , Contaminación de Medicamentos/prevención & control , Extractos Vegetales/química , Rizoma/química , Saponinas/análisis , Esteroides/análisis , Cromatografía Líquida de Alta Presión/métodos , Suplementos Dietéticos/análisis , Dioscorea/clasificación , Estructura Molecular , Análisis de Componente Principal , Estándares de Referencia , Saponinas/química , Especificidad de la Especie , Espectrometría de Masa por Ionización de Electrospray/métodos , Esteroides/química
7.
J Nat Prod ; 77(3): 509-15, 2014 Mar 28.
Artículo en Inglés | MEDLINE | ID: mdl-24471493

RESUMEN

Six new octulosonic acid derivatives (1-6) were isolated from the flower heads of Roman chamomile (Chamaemelum nobile). Their structures were elucidated by means of spectroscopic interpretation. The biological activity of the isolated compounds was evaluated toward multiple targets related to inflammation and metabolic disorder such as NAG-1, NF-κB, iNOS, ROS, PPARα, PPARγ, and LXR. Similar to the action of NSAIDs, all the six compounds (1-6) increased NAG-1 activity 2-3-fold. They also decreased cellular oxidative stress by inhibiting ROS generation. Compounds 3, 5, and 6 activated PPARγ 1.6-2.1-fold, while PPARα was activated 1.4-fold by compounds 5 and 6 only. None of the compounds showed significant activity against iNOS or NF-κB. This is the first report of biological activity of octulosonic acid derivatives toward multiple pathways related to inflammation and metabolic disorder. The reported anti-inflammatory, hypoglycemic, antiedemic, and antioxidant activities of Roman chamomile could be partly explained as due to the presence of these constituents.


Asunto(s)
Antiinflamatorios no Esteroideos/aislamiento & purificación , Antiinflamatorios no Esteroideos/farmacología , Chamaemelum/química , Azúcares Ácidos/aislamiento & purificación , Azúcares Ácidos/farmacología , Antiinflamatorios no Esteroideos/química , Flores/química , Hipoglucemiantes/farmacología , Mississippi , Estructura Molecular , FN-kappa B/metabolismo , Óxido Nítrico Sintasa de Tipo II/efectos de los fármacos , Resonancia Magnética Nuclear Biomolecular , Estrés Oxidativo/efectos de los fármacos , PPAR alfa/metabolismo , PPAR gamma/metabolismo , Azúcares Ácidos/química
8.
Neurotoxicol Teratol ; 41: 80-8, 2014.
Artículo en Inglés | MEDLINE | ID: mdl-24368316

RESUMEN

The use of over-the-counter botanical estrogens containing isolated soy isoflavones, including genistein and daidzein, has become a popular alternative to traditional hormone therapies. Menopausal women use these products as an aide in healthy aging, including for the maintenance of cognitive function. The safety and efficacy of many of these commercial preparations remain unknown. Previous research in our lab found that treatment of ovariectomized (OVX) female Long-Evans rats with genistein impaired working memory in an operant delayed spatial alternation (DSA) task and response learning in a plus-maze, but enhanced place learning assessed in the plus-maze. The present study further examined the effects of isolated isoflavones on working memory and place learning by treating middle-aged (12-13 month old) OVX female Long-Evans rats with S-equol, the exclusive enantiomer produced by metabolism of daidzein in the mammalian gut. S-equol binds selectively to ERß with an affinity similar to that of genistein but has low transcriptional potency. For DSA testing, S-equol at 1.94, 0.97 mg, or 0mg (sucrose control) was orally administered to animals daily, 30 min before behavioral testing, and again both 4 and 8 hours after the first treatment. Rats were tested on the DSA task following the first, morning dose. For place learning, rats received 0.97 mg S-equol every 4 hours during the light portion of the cycle beginning 48 hours prior to behavioral testing (total exposure 8.7 mg S-equol). S-equol treatment was largely without effect on the DSA and place learning tasks. This is the first study to test the behavioral effects of isolated S-equol in OVX rodents, and shows that, unlike genistein or estradiol, repeated daily treatment with this isoflavone metabolite does not alter learning and memory processes in middle-aged OVX rats.


Asunto(s)
Equol/administración & dosificación , Trastornos de la Memoria/dietoterapia , Análisis de Varianza , Animales , Condicionamiento Operante/efectos de los fármacos , Relación Dosis-Respuesta a Droga , Equol/sangre , Femenino , Genisteína/toxicidad , Aprendizaje por Laberinto/fisiología , Trastornos de la Memoria/inducido químicamente , Memoria a Corto Plazo , Ovariectomía , Fitoestrógenos/toxicidad , Ratas , Ratas Long-Evans , Proteínas de Soja/administración & dosificación
9.
Biomed Chromatogr ; 28(2): 281-94, 2014 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-24019066

RESUMEN

Ultra high-performance liquid chromatography (UHPLC) with evaporative light scattering detection was used for the quantification of steroidal saponins and diosgenin from the rhizomes or tubers of various Dioscorea species and dietary supplements that were purported to contain Dioscorea. The analysis was performed on an Acquity UPLC™ system with an UPLC™ BEH Shield RP18 column using a gradient elution with water and acetonitrile. Owing to their low UV absorption, the steroidal saponins were observed by evaporative light scattering detection. The 12 compounds could be separated within 15 min using the developed UHPLC method with detection limits of 5-12 µg/mL with 2 µL injection volume. The analytical method was validated for linearity, repeatability, accuracy, limits of detection and limits of quantification. The relative standard deviations for intra- and inter-day experiments were <3.1%, and the recovery efficiency was 97-101%. The total content of standard compounds was found to be in the ranges 0.01-14.5% and 0.9-28.6 mg daily intake for dry plant materials and solid commercial preparations, respectively. UHPLC-mass spectrometry with a quadrupole mass analyzer and ESI source was used only for confirmation of the identity of the various saponins. The developed method is simple, rapid and especially suitable for quality control analysis of commercial products.


Asunto(s)
Cromatografía Líquida de Alta Presión/métodos , Suplementos Dietéticos/análisis , Dioscorea/química , Diosgenina/análisis , Extractos Vegetales/química , Saponinas/análisis , Diosgenina/química , Límite de Detección , Modelos Lineales , Reproducibilidad de los Resultados , Saponinas/química
10.
J Pharm Biomed Anal ; 88: 278-88, 2014 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-24095803

RESUMEN

A new rapid UHPLC-UV-QTOF/MS method has been developed for the simultaneous analysis of nine phenolic compounds [(Z)-2-ß-d-glucopyranosyloxy-4-methoxycinnamic acid (cis-GMCA), chlorogenic acid, (E)-2-ß-d-glucopyranosyloxy-4-methoxycinnamic acid (trans-GMCA), quercetagetin-7-O-ß-d-glucopyranoside, luteolin-7-O-ß-d-glucoside, apigenin-7-O-ß-d-glucoside, chamaemeloside, apigenin 7-O-(6″-O-acetyl-ß-d-glucopyranoside), apigenin] and one polyacetylene (tonghaosu) from the flower heads of Chamomile/Chrysanthemum samples. The chromatographic separation was achieved using a reversed phase C18 column with a mobile phase of water and acetonitrile, both containing 0.05% formic acid. The ten compounds were completely separated within 15min at a flow rate of 0.25mL/min with a 2µL injection volume. The different chemo-types of Chamomiles/Chrysanthemum displayed variations in the presence of chemical constituents. German Chamomile samples confirmed the presence of cis-GMCA, trans-GMCA, apigenin-7-O-ß-d-glucoside and tonghaosu as major constituents whereas Roman chamomile samples confirmed the presence of chamamaeloside and apigenin as major compounds. The Chrysanthemum morifolium samples showed the presence of luteolin-7-O-ß-d-glucose as the major compound. The method was applied for the analysis of various commercial products including capsules, tea bags, body and hair care products. LC-mass spectrometry with electrospray ionization (ESI) interface method is described for the evaluation of ten compounds in plant samples and commercial products. This method involved the detection of [M+Na](+) and [M+H](+) ions in the positive mode. Partial least squares discriminant analysis (PLS-DA) was used to visualize commercial samples quality and may be of value for discriminating between chamomile types and Chrysanthemum with regards to the relative content of individual constituents. The results indicated that the method is suitable as a quality control test for various Chamomile/Chrysanthemum samples and market products.


Asunto(s)
Manzanilla/química , Chrysanthemum/química , Flores/química , Calibración , Química Farmacéutica , Cromatografía Líquida de Alta Presión , Iones , Análisis de los Mínimos Cuadrados , Espectrometría de Masas , Fenol/química , Extractos Vegetales/química , Análisis de Componente Principal , Control de Calidad , Reproducibilidad de los Resultados , Sensibilidad y Especificidad , Espectrometría de Masa por Ionización de Electrospray , Espectrofotometría Ultravioleta
11.
Planta Med ; 79(15): 1421-8, 2013 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-23970424

RESUMEN

Dioscorea villosa (wild yam) is native to North America and has been widely used as a natural alternative for estrogen replacement therapy to improve women's health as well as to treat inflammation, muscle spasm, and asthma. Diosgenin and dioscin (glycoside form of diosgenin) are reported to be the pharmacologically active compounds. Despite the reports of significant pharmacological properties of dioscin and diosgenin in conditions related to inflammation, cancer, diabetes, and gastrointestinal ailments, no reports are available on ADME properties of these compounds. This study was carried out to determine ADME properties of diosgenin and dioscin and their effects on major drug metabolizing enzymes (CYP 3A4, 2D6, 2C9, and 1A2). The stability was determined in simulated gastric and intestinal fluids (SGF, pH 1.2 and SIF, pH 6.8), and intestinal transport was evaluated in Caco-2 model. Phase I and phase II metabolic stability was determined in human liver microsomes and S9 fractions, respectively. Quantitative analysis of dioscin and diosgenin was performed by UPLC-MS system. Dioscin degraded up to 28.3 % in SGF and 12.4 % in SIF, which could be accounted for by its conversion to diosgenin (24.2 %. in SGF and 2.4 % in SIF). The depletion of diosgenin in SGF and SIF was < 10 %. Diosgenin was stable in HLM but disappeared in S9 fraction with a half-life of 11.3 min. In contrast, dioscin was stable in both HLM and S9 fractions. Dioscin showed higher permeability across Caco-2 monolayer with no significant efflux, while diosgenin was subjected to efflux mediated by P-glycoprotein. Diosgenin and dioscin inhibited CYP3A4 with IC50 values of 17 and 33 µM, respectively, while other CYP enzymes were not affected. In conclusion, dioscin showed better intestinal permeability. Conversion of dioscin to diosgenin was observed in both gastric and intestinal fluids. No phase I metabolism was detected for both compounds. The disappearance of diosgenin in S9 fraction indicated phase II metabolism.


Asunto(s)
Dioscorea/química , Diosgenina/farmacocinética , Fase II de la Desintoxicación Metabólica , Extractos Vegetales/farmacocinética , Miembro 1 de la Subfamilia B de Casetes de Unión a ATP/metabolismo , Antiinflamatorios/farmacocinética , Células CACO-2 , Citocromo P-450 CYP3A/metabolismo , Diosgenina/análogos & derivados , Diosgenina/metabolismo , Semivida , Humanos , Concentración 50 Inhibidora , Absorción Intestinal , Parasimpatolíticos/farmacocinética , Permeabilidad , Extractos Vegetales/metabolismo
12.
FASEB J ; 27(11): 4406-18, 2013 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-23882126

RESUMEN

Because little is known about the actions of botanical estrogens (BEs), widely consumed by menopausal women, we investigated the mechanistic and cellular activities of some major BEs. We examined the interactions of genistein, daidzein, equol, and liquiritigenin with estrogen receptors ERα and ERß, with key coregulators (SRC3 and RIP140) and chromatin binding sites, and the regulation of gene expression and proliferation in MCF-7 breast cancer cells containing ERα and/or ERß. Unlike the endogenous estrogen, estradiol (E2), BEs preferentially bind to ERß, but their ERß-potency selectivity in gene stimulation (340- to 830-fold vs. E2) is enhanced at several levels (coregulator recruitment, chromatin binding); nevertheless, at high (0.1 or 1 µM) concentrations, BEs also fully activate ERα. Because ERα drives breast cancer cell proliferation and ERß dampens this, the relative levels of these two ERs in target cells and the BE dose greatly affect gene expression and proliferative response and will be crucial determinants of the potential benefits vs. risks of BEs. Our findings reveal key and novel mechanistic differences in the estrogenic activities of BEs vs. E2, with BEs displaying patterns of activity distinctly different from those seen with E2 and provide valuable information to inform future studies.


Asunto(s)
Receptor beta de Estrógeno/metabolismo , Fitoestrógenos/farmacología , Proteínas Adaptadoras Transductoras de Señales/metabolismo , Sitios de Unión , Proliferación Celular , Cromatina/metabolismo , Relación Dosis-Respuesta a Droga , Estradiol/farmacología , Receptor alfa de Estrógeno/metabolismo , Humanos , Células MCF-7 , Proteínas Nucleares/metabolismo , Coactivador 3 de Receptor Nuclear/metabolismo , Proteína de Interacción con Receptores Nucleares 1 , Transcripción Genética
13.
Nat Prod Commun ; 8(3): 319-21, 2013 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-23678800

RESUMEN

Nine glycosides of spirostan (1-7) and furostan (8 and 9) type steroids including a new compound, 7-oxodioscin (1), were isolated from the rhizomes of Dioscorea nipponica. The structure of 1 was established as (25R)-3beta-O-[(alpha-L-rhamnopyranosyl-(1 --> 4)-O-[alpha-L-rhamnopyranosyl-(1 --> 2)]-beta-D-glucopyranosyl)oxy]spirost-5-en-7-one by extensive spectroscopic techniques including HRESI-TOFMS, 1D and 2D NMR, and chemical methods. Known compounds were elucidated as dioseptemloside G (2), (25R)-dracaenoside G (3), orbiculatoside B (4), dioscin (5), progenin III (6), gracillin (7), (3beta3,22alpha,25R)-26-(beta-D-glucopyranosyloxy)-22-methoxyfurost-5-en-3-yl O-[alpha-L-rhamnopyranosyl-(1 --4)]-beta-D-glucopyranoside (8), and methylprotodioscin (9).


Asunto(s)
Dioscorea/química , Glicósidos/química , Espirostanos/química , Estructura Molecular , Esteroides/química
14.
Nat Prod Commun ; 8(3): 323-6, 2013 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-23678801

RESUMEN

Two new fatty acid-spirostan steroid glycoside esters, progenin III palmitate (1) and progenin III linoleate (2), were isolated from the MeOH extract of Dioscorea cayenensis rhizomes. The extract also yielded seven previously known spirostan and furostan steroid glycosides (3-9). The structures of the new compounds were established as (25R)-spirost-5-en-3beta-yl O-alpha-L-rhamnopyranosyl-(1 --> 2)-[6-O-palmitoyl]-O-beta-D-glucopyranoside (1) and (25R)-spirost-5-en-3beta-yl O-alpha-L-rhamnopyranosyl-(1 --> 2)-[6-O-linoleoyl]-O-beta-D-glucopyranoside (2) by chemical and spectroscopic methods, including 1D and 2D NMR. The known compounds were identified as progenin III (3), dioscin (4), deltonin (5), asperin (6), gracillin (7), protodioscin (8)], and methyl protodioscin (9).


Asunto(s)
Dioscorea/química , Glicósidos/química , Espirostanos/química , Diosgenina/análogos & derivados , Diosgenina/química , Espectroscopía de Resonancia Magnética , Estructura Molecular , Saponinas/química
15.
Carbohydr Res ; 370: 86-91, 2013 Apr 05.
Artículo en Inglés | MEDLINE | ID: mdl-23454141

RESUMEN

Phytochemical investigation of the MeOH extract of Dioscorea villosa rhizomes resulted in the isolation of two new bidesmosidic cholestane steroid glycosides, dioscoreavillosides A and B (1 and 2). In addition, the extract yielded 12 previously known furostan and spirostan steroid glycosides (3-14), along with diosgenin (15). Compounds 3-7, 9, 14, and 15 were isolated for the first time from D. villosa. The structures of the isolated compounds were determined using spectroscopic and chemical methods including 1D and 2D NMR. The antimicrobial action of most of these compounds was tested against five fungal and five bacterial strains.


Asunto(s)
Antiinfecciosos/química , Antiinfecciosos/farmacología , Colestanos/química , Dioscorea/química , Glicósidos/química , Glicósidos/farmacología , Rizoma/química , Antiinfecciosos/aislamiento & purificación , Bacterias/efectos de los fármacos , Hongos/efectos de los fármacos , Glicósidos/aislamiento & purificación
16.
Nat Prod Commun ; 7(9): 1177-80, 2012 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-23074901

RESUMEN

A rapid UPLC method was developed for the simultaneous analysis of five indole alkaloids (harmalol, harmol, harmane, harmaline and harmine) and four flavonoids (orientin, isoorientin, vitexin, and isovitexin) from the aerial parts of Passiflora incarnata L. (Passifloraceae), other species of Passiflora (P. violacea Veil., P. edulis Sims., P. suberosa L., P. morifolia Mast. and P. quadrangularis L.), Peganum harmala, and dietary supplements that claim to contain Passiflora. The separation was achieved within eight minutes by using C-18 column, a water/acetonitrile mobile phase, both containing formic acid, using a gradient system and a temperature of 35 degrees C. The method was validated for linearity, repeatability, limits of detection (LOD), and limits of quantification (LOQ). The wavelength used for quantification with the diode array detector was 340 nm for flavonoids and alkaloids. The developed method is simple, economic, fast and especially suitable for quality control analysis of flavonoids and alkaloids in plant samples and dietary supplements. The compounds (including isoschaftoside and schaftoside) in plant samples and commercial products of Passiflora were identified and confirmed by UPLC-MS. A HPTLC method was also developed for the chemical fingerprint analysis of Passiflora samples.


Asunto(s)
Alcaloides/análisis , Flavonoides/análisis , Passiflora/química , Cromatografía Liquida , Cromatografía en Capa Delgada , Suplementos Dietéticos , Espectrometría de Masas , Control de Calidad , Espectrofotometría Ultravioleta
17.
J Pharm Biomed Anal ; 70: 53-63, 2012 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-22809670

RESUMEN

UPLC-UV and HPLC-TOF-MS methods have been developed for the analysis of major sesquiterpenes and pyrrolizidine alkaloids from rhizomes of Petasites hybridus (L.) G.M. et Sch. (Family, Asteracea) and dietary supplements claiming to contain P. hybridus. The best results were obtained with Acquity UPLC™ HSS T3 (100 mm × 2.1 mm, I.D., 1.8 µm) column system using a gradient elution with a mobile phase consisting of ammonium formate (50mM) and acetonitrile (0.05% formic acid) at a constant flow rate of 0.25 mL/min via UPLC-UV. The newly developed method was validated according to the ICH guidelines with respect to specificity, linearity, accuracy and precision. The limits of detection were found to be 5 µg/mL and 0.1 µg/mL for pyrrolizidine alkaloids and sesquiterpenes, respectively by UPLC-UV and 0.001 and 0.01 µg/mL, respectively using HPLC-TOF-MS. The methods were successfully used to analyze different P. hybridus market products, as well as to distinguish between two other Petasites species. The total content of petasins was found to be in the range of 0.02-11.6 mg/dosage form for 15 dietary supplements and no petasins were detected in an additional six dietary supplements. Additionally, pyrrolizidine alkaloids, which are considered to be toxic for the liver, were detected in seven dietary supplements. The amount of petasin in seven dietary supplements was found to be within limits of label claim and no pyrrolizidine alkaloids were detected. HPLC-mass spectrometry coupled with electrospray ionization (ESI) interface method is described for the identification and confirmation of sesquiterpenes and pyrrolizidine alkaloids from plant extracts and dietary supplements that claim to contain P. hybridus as well as different species of Petasites.


Asunto(s)
Cromatografía Líquida de Alta Presión , Cromatografía Liquida , Suplementos Dietéticos/análisis , Petasites/química , Alcaloides de Pirrolicidina/análisis , Rizoma/química , Sesquiterpenos/análisis , Espectrometría de Masa por Láser de Matriz Asistida de Ionización Desorción , Espectrofotometría Ultravioleta , Tampones (Química) , Calibración , Cromatografía Líquida de Alta Presión/normas , Cromatografía Liquida/normas , Suplementos Dietéticos/normas , Límite de Detección , Petasites/clasificación , Control de Calidad , Estándares de Referencia , Reproducibilidad de los Resultados , Espectrometría de Masa por Ionización de Electrospray , Espectrometría de Masa por Láser de Matriz Asistida de Ionización Desorción/normas , Espectrofotometría Ultravioleta/normas
18.
J Pharm Biomed Anal ; 63: 120-7, 2012 Apr 07.
Artículo en Inglés | MEDLINE | ID: mdl-22342658

RESUMEN

Scutellaria lateriflora has been used more than 200 years as a mild relaxant and as a therapy for anxiety, nervous tension, and convulsions. Currently, it is one of the most popular botanicals with many products on the USA market. Flavonoids with anxiolytic property have been reported from the aerial parts of this plant. From the HPLC chromatogram of the methanolic extract of this plant, it can be concluded that some flavonoids have not been identified yet. In the present study a simple high-performance liquid chromatography with UV and electrospray ionization mass spectrometric detection (HPLC-DAD/ESI-MS(n)) method has been developed for the identification of major phenolic compounds from it. The ESI-MS(n) fragmentation pathways of four types of flavonoid references have been interpreted which provide very useful guidance for the characterization of different types of flavonoids from this plant. Further analysis of the methanolic extract of S. latellaria based on the combination of their fragmentation patterns with the UV spectra led to characterize thirteen flavonoids and one stilbene derivative, seven of which are described for the first time from this species.


Asunto(s)
Ansiolíticos/aislamiento & purificación , Cromatografía Líquida de Alta Presión , Flavonoides/aislamiento & purificación , Fenoles/aislamiento & purificación , Extractos Vegetales/química , Scutellaria/química , Espectrometría de Masa por Ionización de Electrospray , Espectrofotometría Ultravioleta , Espectrometría de Masas en Tándem , Metanol/química , Estructura Molecular , Componentes Aéreos de las Plantas , Plantas Medicinales , Solventes/química
19.
J Pharm Biomed Anal ; 56(5): 895-903, 2011 Dec 15.
Artículo en Inglés | MEDLINE | ID: mdl-21872415

RESUMEN

Analytical methods including HPLC, UPLC and HPTLC are presented for the determination of major alkaloid and triterpene saponins from the roots of Caulophyllum thalictroides (L.) Michx. (blue cohosh) and dietary supplements claiming to contain blue cohosh. A separation by LC was achieved using a reversed phase column, PDA with ELS detection, and ammonium acetate/acetonitrile gradient as the mobile phase. Owing to their low UV absorption, the triterpene saponins were detected by evaporative light scattering. The eight triterpene saponins (cauloside H, leonticin D, cauloside G, cauloside D, cauloside B, cauloside C, cauloside A and saponin PE) and the alkaloid magnoflorine could be separated within 35 min using HPLC method and within 8.0 min using UPLC method with detection limits of 10 µg/mL for saponins and 1 µg/mL for magnoflorine. The detection wavelength was 320 nm for magnoflorine and ELS detection was used for the eight saponins. The methods were also successfully applied to analyze different dietary supplements. For the products claiming to contain blue cohosh, there was a significant variability in the amounts of triterpene saponins detected. Calculations based on the analysis results for dietary supplements showed that maximum daily intake of alkaloid and saponins vary with the form (solids/liquids) and recommended doses according to the products label. Intakes varied from 0.57 to 15.8 mg/day for magnoflorine and from 5.97 to 302.4 mg/day for total saponins. LC-mass spectrometry coupled with electrospray ionization (ESI) method is described for the identification and confirmation of nine compounds in plant samples and dietary products. A HPTLC method was also developed for the fast chemical fingerprint analysis of C. thalictroides samples.


Asunto(s)
Aporfinas/análisis , Caulophyllum/química , Cromatografía Liquida/métodos , Raíces de Plantas/química , Saponinas/análisis , Aporfinas/química , Secuencia de Carbohidratos , Límite de Detección , Datos de Secuencia Molecular , Reproducibilidad de los Resultados , Saponinas/química , Espectrofotometría Ultravioleta
20.
Planta Med ; 77(15): 1742-8, 2011 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-21590653

RESUMEN

This study describes the first analytical method for the determination of four triterpene saponins (ardisicrenoside B, ardisiacrispin A, 3- O- α- L-rhamnopyranosyl-(1 → 2)-ß-D-glucopyranosyl-(1 → 4)-α-L-arabinopynanosyl cyclamiretin A and ardisimamilloside H) and three alkenated-phenolics (irisresorcinol, belamcandol B, and demethylbelamcandaquinone B) from the leaves, leaves/stems, and roots of LABISIA PUMILA using an HPLC-UV-ELSD method. The separation was achieved using a reversed-phase (C-18) column, PDA and ELS detection, and a water/acetonitrile gradient as the mobile phase. The major triterpenoid (ardisiacrispin A) and irisresorcinol compounds were detected at a concentration as low as 10.0 and 0.2 µg/mL, respectively. Analysis of various samples showed considerable variation of 0.11-2.46 % for the major triterpenoid compound, ardisiacrispin A. LC-mass spectrometry method coupled with electrospray ionization (ESI) is described for the identification of compounds in plant samples. This method involved the use of the [M + Na]+ and [M + NH4]+ ions for compounds 1-4 in the positive ion mode with extractive ion chromatogram (EIC).


Asunto(s)
Fenoles/análisis , Extractos Vegetales/análisis , Primulaceae/química , Saponinas/análisis , Triterpenos/análisis , Cromatografía Líquida de Alta Presión , Cromatografía Liquida/métodos , Estructura Molecular , Fenoles/química , Fenoles/aislamiento & purificación , Extractos Vegetales/química , Extractos Vegetales/aislamiento & purificación , Hojas de la Planta/química , Raíces de Plantas/química , Tallos de la Planta/química , Saponinas/química , Saponinas/aislamiento & purificación , Espectrometría de Masa por Ionización de Electrospray/métodos , Espectrofotometría Ultravioleta , Triterpenos/química , Triterpenos/aislamiento & purificación
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