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1.
PLoS One ; 19(6): e0300099, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38875226

RESUMO

In this paper, a Multi-Index Nonlinear Robust Adaptive Control (MINRAC) method was proposed for ultra-complex multi-input multi-output power systems with uncertain parameter factors and external disturbances. The controller designed by this method has excellent static and dynamic characteristics. Under the condition of the uncertainty of system parameters and external disturbance at the same time, the MINRAC method can ensure that the multiple indexes concerned by ultra-complex power systems can be controlled at their expected values. The simulation results showed that the control mechanism of MINRAC method was consistent in both single-machine infinite bus system and multi-machine interconnected coupling system. The output function chooses power angle, angular frequency and terminal voltage as constraints. When the system has parameter uncertainty and external interference, the uncertain parameter values are adjusted by adaptive control to force these indicators to tend to the given expected value. For three-phase short circuit, which is the most serious fault in power system, the use of multi index nonlinear robust controller can ensure that the system is stable in a wide range and has better dynamic performance.


Assuntos
Dinâmica não Linear , Algoritmos , Simulação por Computador , Fontes de Energia Elétrica , Modelos Teóricos
2.
Artigo em Inglês | MEDLINE | ID: mdl-37917355

RESUMO

Copper nanowire (CuNW), with combined advantages of high conductivity and cost-effectiveness, is considered a promising material for the development of next-generation transparent conductive films (TCFs) in the field of flexible optoelectronics. However, the practical application of CuNW TCFs is hindered by some limitations, such as conductivity degradation and poor adhesion. Here, we demonstrate a stable CuNW composite film by embedding CuNWs into a polydopamine (PDA)-modified sodium alginate (NaAlg) matrix without sacrificing the optoelectronic properties of the CuNW network. The introduction of the PDA modifier significantly enhances the antiaging capability of the NaAlg layer, providing strengthened protection of the embedded CuNWs against moisture and oxygen, thereby resulting in minimal degradation of the conductivity of CuNWs for up to 9 months under ambient conditions. Simultaneously, the interface adhesion between the CuNW network and the substrate is further enhanced due to the abundance of catechol structures in PDA, allowing for the maintenance of the electrical conductivity of the CuNW network even under cyclic external bending stress and tape-peeling forces. In addition, embedding CuNWs into the polymer binding layer produces a CuNW composite film with a very smooth surface. A flexible OLED based on the PDA-modified NaAlg/CuNW TCF is successfully fabricated, exhibiting performance comparable to that of a traditional rigid indium tin oxide-based device, while also demonstrating remarkable mechanical durability. The modification strategy can promote practical applications of the CuNW network in flexible optoelectronic devices.

3.
ACS Appl Mater Interfaces ; 15(29): 35366-35379, 2023 Jul 26.
Artigo em Inglês | MEDLINE | ID: mdl-37439547

RESUMO

Silver nanowire (AgNW) is recognized as a critical material for developing the next generation of transparent conductive films (TCFs); however, poor stability remains a major issue. Herein, we demonstrate a stable AgNW TCF passivated by a metal-organic framework (MOF) via a facile solution process. The MOF is chemically bonded to the surface of the AgNWs as a chemical inhibitor, which contributes to passivating highly active sites and providing chemical protection, leading to enhanced resistance to corrosive molecules and thereby offering exceptional stability under an ambient atmosphere. Simultaneously, the binding interaction with the MOF anchors silver atoms at the surface of the nanowires, suppressing their diffusion at high temperatures and allowing the AgNW film to maintain excellent conductivity up to 300 °C. Additionally, the hydrogen bonding between the MOF and the substrate, along with the tight connection of the MOF with AgNWs, improves the welding between the nanowires, enhancing the conductivity of the AgNW film at mild conditions while offering good flexibility and adhesion properties. Furthermore, the OLED device integrating the MOF-modified AgNW electrode shows comparable performance to an indium tin oxide-based device, verifying its huge potential for applications in optoelectronic devices.

4.
Hereditas ; 160(1): 10, 2023 Mar 10.
Artigo em Inglês | MEDLINE | ID: mdl-36895014

RESUMO

BACKGROUND: RNA binding proteins (RBPs) have been implicated in oncogenesis and progression in various cancers. However, the potential value of RBPs as prognostic indicators and therapeutic targets in colorectal cancer (CRC) requires further investigation. METHODS: Four thousand eighty two RBPs were collected from literature. The weighted gene co-expression network analysis (WGCNA) was performed to identify prognosis-related RBP gene modules based on the data attained from the TCGA cohorts. LASSO algorithm was conducted to establish a prognostic risk model, and the validity of the proposed model was confirmed by an independent GEO dataset. Functional enrichment analysis was performed to reveal the potential biological functions and pathways of the signature and to estimate tumor immune infiltration. Potential therapeutic compounds were inferred utilizing CMap database. Expressions of hub genes were further verified through the Human Protein Atlas (HPA) database and RT-qPCR. RESULTS: One thousand seven hundred thirty four RBPs were differently expressed in CRC samples and 4 gene modules remarkably linked to the prognosis were identified, based on which a 12-gene signature was established for prognosis prediction. Multivariate Cox analysis suggested this signature was an independent predicting factor of overall survival (P < 0.001; HR:3.682; CI:2.377-5.705) and ROC curves indicated it has an effective predictive performance (1-year AUC: 0.653; 3-year AUC:0.673; 5-year AUC: 0.777). GSEA indicated that high risk score was correlated with several cancer-related pathways, including cytokine-cytokine receptor cross talk, ECM receptor cross talk, HEDGEHOG signaling cascade and JAK/STAT signaling cascade. ssGSEA analysis exhibited a significant correlation between immune status and the risk signature. Noscapine and clofazimine were screened as potential drugs for CRC patients with high-risk scores. TDRD5 and GPC1 were identified as hub genes and their expression were validated in 15 pairs of surgically resected CRC tissues. CONCLUSION: Our research provides a depth insight of RBPs' role in CRC and the proposed signature are helpful to the personalized treatment and prognostic judgement.


Assuntos
Neoplasias Colorretais , Proteínas Hedgehog , Humanos , Algoritmos , Neoplasias Colorretais/genética , Citocinas , Prognóstico , Redes Reguladoras de Genes , Proteínas de Ligação a RNA/genética
5.
J Ethnopharmacol ; 276: 113991, 2021 Aug 10.
Artigo em Inglês | MEDLINE | ID: mdl-33675914

RESUMO

ETHNOPHARMACOLOGICAL RELEVANCE: Cistanche tubulosa (Schrenk) R. Wight (Orobanchaceae) is a frequently prescribed component in many traditional herbal prescriptions which are used to treat diabetes in China. In recent studies, the antidiabetic activity of Cistanche tubulosa extracts have been confirmed. However, no systematic investigation has been reported on the total glycosides of Cistatnche tubulosa (TGCT). AIM OF THE STUDY: The present study aimed to investigate the hypoglycemic and hypolipidemic effects of TGCT and the potential mechanisms in diet/streptozotocin (STZ)-induced diabetic rats, and to chemically characterize the main constituents of TGCT. MATERIALS AND METHODS: The major constituents of TGCT were characterized by HPLC/Q-TOF-MS and the analytical quantification was performed with HPLC-DAD. Type 2 diabetic rats were induced by high-fat high-sucrose diet (HFSD) and a single injection of STZ (30 mg/kg). TGCT (50 mg/kg, 100 mg/kg and 200 mg/kg) or metformin (200 mg/kg) were orally administered for 6 weeks. Body weight and calorie intake were monitored throughout the experiment. Fasting plasma glucose (FPG), oral glucose tolerance test (OGTT), area under curve of glucose (AUC-G), glycosylated hemoglobin (HbA1c), fasting insulin, serum C-peptide, glycogen content and insulin sensitivity index were tested. The levels of phosphorylated protein kinase B and phosphorylated glycogen synthase kinase 3ß, the activities of hexokinase and pyruvate kinase were assayed. Meanwhile, the changes in serum lipid profiles, superoxide dismutase, glutathione peroxidase, malondialdehyde and inflammatory factors were measured. Histological of pancreas were also evaluated by haematoxylin-eosin stain. RESULTS: Our investigation revealed the presence of phenylethanoid glycosides (PhGs): echinacoside (500.19 ± 11.52 mg/g), acteoside (19.13 ± 1.44 mg/g) and isoacteoside (141.82 ± 5.78 mg/g) in TGCT. Pharmacological tests indicated that TGCT significantly reversed STZ-induced weight loss (11.1%, 200 mg/kg); decreased FPG (56.4%, 200 mg/kg) and HbA1c (37.4%, 200 mg/kg); ameliorated the OGTT, AUC-G and insulin sensitivity; increased glycogen content (40.8% in liver and 52.6% in muscle, 200 mg/kg) and the activities of carbohydrate metabolizing enzymes; regulated lipid profile changes and the activities of antioxidant enzymes; diminished serum markers of oxidative stress and inflammation in a dose-dependent manner (p < 0.05). CONCLUSIONS: This study confirmed that TGCT was an effective nutritional agent for ameliorating hyperglycemia and hyperlipidemia in diet/STZ-induced diabetic rats, which might be largely attributed to the activities of TGCT on inhibitions of oxidative stress and inflammation.


Assuntos
Cistanche/química , Diabetes Mellitus Experimental/tratamento farmacológico , Glicosídeos/farmacologia , Hipoglicemiantes/farmacologia , Hipolipemiantes/farmacologia , Extratos Vegetais/farmacologia , Animais , Glicemia/efeitos dos fármacos , Peso Corporal/efeitos dos fármacos , Peptídeo C/sangue , Dieta/efeitos adversos , Ingestão de Alimentos/efeitos dos fármacos , Hemoglobinas Glicadas/efeitos dos fármacos , Glicogênio/metabolismo , Glicosídeos/química , Glicosídeos/uso terapêutico , Hipoglicemiantes/uso terapêutico , Hipolipemiantes/uso terapêutico , Inflamação/metabolismo , Insulina/sangue , Masculino , Estresse Oxidativo/efeitos dos fármacos , Pâncreas/efeitos dos fármacos , Pâncreas/patologia , Fosfotransferases/metabolismo , Extratos Vegetais/química , Extratos Vegetais/uso terapêutico , Ratos Sprague-Dawley , Estreptozocina
6.
Phytochemistry ; 173: 112223, 2020 May.
Artigo em Inglês | MEDLINE | ID: mdl-32113063

RESUMO

Seven undescribed labdane diterpenoids, japonicones A-G, were isolated from the aerial parts of Leonurus japonicus Houtt. Japonicones C-G contained two keto carbonyl groups in their structures attached to C-3 and C-7, which are rare for labdane diterpenoids. The structures and absolute configurations of japonicones A-G were established by means of spectroscopic analyses (HRESIMS, 1D and 2D NMR, and ECD). Their anti-inflammatory activities were evaluated by measuring their inhibitory effects on PGE2 production in LPS-stimulated RAW264.7 macrophages. Japonicones A-D and G showed inhibition of PGE2 production with IC50 values in the range of 8.62-30.71 µM (the positive control paracetamol showed an IC50 = 5.79 µM).


Assuntos
Diterpenos , Leonurus , Anti-Inflamatórios , Espectroscopia de Ressonância Magnética , Estrutura Molecular
7.
Biomed Chromatogr ; 33(12): e4692, 2019 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-31452210

RESUMO

Ginkgo diterpene lactone (GDL) is the raw material for ginkgo diterpene lactone meglumine injection, which is used for treating cerebral ischemia. The aims of this study were to explore the cellular pharmacokinetics of GDL in whole cells and subcellular fractions, and detect cellular pharmacodynamics on the human SH-SY5Y cells induced by oxygen-glucose deprivation and reoxygenation (OGD/R). Firstly, a simple, sensitive and reliable liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was developed and validated for assessing the amount of ginkgolide A (GA), B (GB) and K (GK) in cellular/subcellular samples. Then, phosphatidylserine and mitochondria membrane potential were assayed to evaluate the extent of apoptosis effect. The study showed that the cellular/subcellular accumulation of GA and GB were increased in a concentration-dependent manner; the levels of GA and GB in cytosol were the highest among these subcellular organelles. Meanwhile, GDL also attenuated the OGD/R-induced increases in the percentage of apoptotic and mitochondria membrane potential. In addition, verapamil increased the rate and amount of GA and GB entering cellular/subcellular compartments through inhibition of P-glycoprotein activity, and promoted the protective effect of GDL. The present study reports the cellular pharmacokinetics profiles of GA and GB in normal and OGD/R-induced SH-SY5Y cells in vitro for the first time, which provided valuable information for clinical safety application.


Assuntos
Membro 1 da Subfamília B de Cassetes de Ligação de ATP , Diterpenos , Ginkgo biloba/química , Lactonas , Membro 1 da Subfamília B de Cassetes de Ligação de ATP/antagonistas & inibidores , Membro 1 da Subfamília B de Cassetes de Ligação de ATP/metabolismo , Linhagem Celular Tumoral , Sobrevivência Celular/efeitos dos fármacos , Cromatografia Líquida , Diterpenos/química , Diterpenos/farmacocinética , Diterpenos/farmacologia , Humanos , Lactonas/química , Lactonas/farmacocinética , Lactonas/farmacologia , Limite de Detecção , Modelos Lineares , Potencial da Membrana Mitocondrial/efeitos dos fármacos , Extratos Vegetais/química , Reprodutibilidade dos Testes , Espectrometria de Massas em Tandem
8.
Zhongguo Zhong Yao Za Zhi ; 44(13): 2675-2679, 2019 Jul.
Artigo em Chinês | MEDLINE | ID: mdl-31359676

RESUMO

As an important integral part of traditional Chinese medicine chemical biology( TCMCB),it is of great importance to rapid isolate,and reliably identify the chemical components in herbal medicines. Phytochemical studies on the anti-inflammatory active part of Chinese dragon's blood,the red resin of Dracaena cochinchinensis,resulted in the isolation of two compounds,nordracophane( 1) and dracophane( 2),using LC-MS and chromatographic techniques( Silica gel,ODS and preparative HPLC). The structures,cyclic dihydrochalcane trimers,were elucidated on the basis of 1 D and 2 D NMR,MS,IR and UV spectral analysis. Compound 1 is a new compound,and 2 is isolated from D. cochinchinensis for the first time. Both compounds exhibited significant inhibition of nitric oxide production in lipopolysaccharides( LPS)-stimulated RAW264. 7 cells with IC50 values of( 14. 9±4. 50) and( 9. 0±0. 7) µmol·L-1.


Assuntos
Anti-Inflamatórios/isolamento & purificação , Espectrometria de Massas , Extratos Vegetais/isolamento & purificação , Animais , Cromatografia Líquida , Dracaena , Camundongos , Óxido Nítrico/metabolismo , Células RAW 264.7
9.
Molecules ; 24(7)2019 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-30939835

RESUMO

Hyperlipidemia is a major component of metabolic syndrome, and regarded as one of the main risk factors causing metabolic diseases. We have developed a therapeutic drug, akebia saponin D (ASD), and determined its anti-hyperlipidemia activity and the potential mechanism(s) of action by analyzing the metabolome and intestinal microbiota. Male Sprague-Dawley rats were fed a high fat diet to induce hyperlipidemia, and then given ASD orally for 8 weeks. Lipid levels in serum were determined biochemically. Metabolites in serum, urine and feces were analyzed by UPLC-Q/TOF-MS, and the structure of the intestinal microbiota was determined by 16S rRNA sequencing. The ASD treatment significantly decreased the levels of TC, TG and LDL-c and increased the serum level of HDL-c. Metabolomics analysis indicated that the ASD treatment mainly impacted seven differential metabolites in the serum, sixteen differential metabolites in the urine and four differential metabolites in feces compared to the model group. The ASD treatment significantly changed eight bacteria at the genus level compared to the model group. In conclusion, ASD treatment can significantly alleviate HFD-induced hyperlipidemia and the hypolipidemic effect of ASD treatment is certainly associated with a systematic change in the metabolism, as well as dynamic changes in the structure of the intestinal microbiota.


Assuntos
Dieta Hiperlipídica/efeitos adversos , Microbioma Gastrointestinal/efeitos dos fármacos , Hiperlipidemias/metabolismo , Hiperlipidemias/microbiologia , Metaboloma/efeitos dos fármacos , Saponinas/farmacologia , Animais , Hiperlipidemias/tratamento farmacológico , Hiperlipidemias/etiologia , Masculino , Filogenia , Ratos , Ratos Sprague-Dawley
10.
Zhongguo Zhong Yao Za Zhi ; 44(2): 298-307, 2019 Jan.
Artigo em Chinês | MEDLINE | ID: mdl-30989949

RESUMO

The study aims to qualitatively analyze the chemical composition of compound Nanxing acesodyne plaster by ultra-high performance liquid chromatography-quadrupole time-of-flight mass spectrometry( UPLC-Q-TOF-MS/MS). The analysis was performed on Agilent Zorbax SB-C_(18)( 4. 6 mm×250 mm,5 µm) column. The mobile phase consisted of methanol and 0. 2% formic acid-water was used as gradient elution. The flow rate was 1 mL·min~(-1) and column temperature was 30 ℃. The Mass spectrometry was acquired in both positive and negative ion modes using ESI. The components were identified by the precise mass-to-charge ratio,secondary fragmentation and other information combined with reference substance and literature data. As a result,58 compounds were identified and predicted,including alkaloids,flavonoids,coumarins,organic acids and lactone compounds,of which 12 compounds were verified by the reference substances. The results provide reference for the quality control of compound Nanxing acesodyne plaster,and lay the foundation for elucidating the active components mechanism.


Assuntos
Cromatografia Líquida de Alta Pressão , Medicamentos de Ervas Chinesas/química , Compostos Fitoquímicos/análise , Espectrometria de Massas em Tandem
11.
Zhongguo Zhong Yao Za Zhi ; 44(1): 150-157, 2019 Jan.
Artigo em Chinês | MEDLINE | ID: mdl-30868826

RESUMO

Ten fractions(A-J) were prepared by separation of Longxue Tongluo Capsules(LTC) by using silica gel column chromatography and orthogonal experimental design,showing similar chemical profiles with different abundances of peaks.These ten samples were assessed with UHPLC-QE OrbitrapHRMS for 97 common peaks.For the pharmacological activity experiment,three kinds of in vitro cell models including lipopolysaccharide(LPS)-induced BV-2 microglial cells NO release model,oxygen-glucose deprivation/reoxygenation(OGD/R)-treated HUVEC vascular endothelial cells injury model,and OGD/R-treated PC-12 nerve cells injury model were employed to evaluated the bioactivity of each fraction.Based on the contribution of each identified component,grey relation analysis and partial least squares(PLS) analysis were performed to establish component-activity relationship of LTC,identify the potential active components.After that,validation of the potential active components in LTC was carried out by using the same models.The results indicated that 4 phenolic compounds including 7,4'-dihydroxyhomoisoflavanone,loureirin C,4,4'-dihydroxy-2,6-dimethoxydihydrochalcone,and homoisosocotrin-4'-ol,might be the active components for anti-neuroinflammation effect;five phenolic compounds such as 3,5,7,4'-tetrahydroxyhomoisoflavanone,loureirin D,7,4'-dihydroxyhomoisoflavane,and 5,7-dihydroxy-4'-methoxy-8-methyflavane,might have positive effects on the vascular endothelial injury;three phenolic compounds including 5,7,4'-trihydroxyflavanone,7,4'-dihydroxy-5-methoxyhomoisoflavane,and loureirin D,might be the active components in LTC against neuronal injury.


Assuntos
Isquemia Encefálica/tratamento farmacológico , Medicamentos de Ervas Chinesas/farmacologia , Células Endoteliais da Veia Umbilical Humana/efeitos dos fármacos , Microglia/efeitos dos fármacos , Cápsulas , Linhagem Celular , Glucose , Humanos , Oxigênio
12.
J Ethnopharmacol ; 233: 169-178, 2019 Apr 06.
Artigo em Inglês | MEDLINE | ID: mdl-30639058

RESUMO

ETHNOPHARMACOLOGICAL RELEVANCE: Gardenia jasminoides fruit (GJF) is used as a well-known traditional folk medicine, a food and a natural colorant in Asia with a long history. The herbal medicine has usually been harvested in the autumn from September to November. However, this time span is too long and might result in the quality instability of GJF. AIM OF STUDY: We aimed to conduct the comprehensive quality evaluation of GJF including the quantitative analysis of the bioactive components and the main bioactivities, and further to determine the most appropriate harvest time of this phytomedicine. MATERIALS AND METHODS: In this study, an UFLC-Q-TRAP-MS/MS method was established to quantify 7 iridoid glycosides (geniposide, geniposidic acid, secoxyloganin, gardenoside, genipin 1-gentiobioside, scandoside methyl ester, and shanzhiside), 7 phenylpropanoid acids (chlorogenic acid, cryptochlorogenic acid, neochlorogenic acid, isochlorogenic acid A, isochlorogenic acid B, isochlorogenic acid C, and caffeic acid) and 2 carotenoids (crocin-1 and crocin-2) in GJF. With this method, nine samples of GJF harvested at different times were analyzed and compared. These samples were also investigated and compared in terms of their antioxidant activity (DPPH free radical scavenging, ABTS free radical scavenging, ferric-reducing antioxidation) and anti-influenza activity (neuraminidase inhibition), which are closely related to the GJF efficacies. Then, hierarchical cluster analysis (HCA) was separately performed for the quantitative analysis and bioactivity evaluation in vitro. RESULTS: The HCA results demonstrated that three GJF samples (S5, S6, and S7) were clustered into one group for both quantitative analysis and bioactivity evaluation in vitro; these three samples were found to have the highest standardized scores in both the former (12.775, 12.106, 10.817) and the latter (3.406, 3.374, 3.440). Based on the comprehensive results, the optimum harvest period was confirmed to extend from mid-October to early-November. CONCLUSIONS: This study firstly validated the use of UFLC-Q-TRAP-MS/MS method for the determination of 16 bioactive components in GJF. It was also the first time that a quantitative analysis and a bioactivity assay in vitro were integrated for the determination of the most appropriate harvest period of GJF. We hope this paper may provide some reference to studies of appropriate harvest periods and even the quality control of TCMs.


Assuntos
Antioxidantes , Antivirais , Gardenia , Compostos Fitoquímicos , Agricultura/métodos , Antioxidantes/química , Antivirais/química , Benzotiazóis/química , Compostos de Bifenilo/química , Análise por Conglomerados , Frutas/química , Gardenia/química , Neuraminidase/antagonistas & inibidores , Compostos Fitoquímicos/análise , Picratos/química , Ácidos Sulfônicos/química
13.
Nat Prod Res ; 33(1): 53-58, 2019 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-29502450

RESUMO

A new dimeric secoiridoids derivative, named japonicaside E, together with six known compounds were isolated from the flower buds of Lonicera japonica. The structures of these compounds were elucidated by the analyses of mass spectrometry and NMR spectroscopy. All compounds were evaluated for anti-inflammatory activity in vitro.


Assuntos
Iridoides/isolamento & purificação , Lonicera/química , Anti-Inflamatórios/isolamento & purificação , Anti-Inflamatórios/farmacologia , Flores/química , Espectroscopia de Ressonância Magnética , Espectrometria de Massas , Estrutura Molecular
14.
Nat Prod Res ; 33(17): 2490-2497, 2019 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-29631433

RESUMO

Two new labdane diterpenoids, Leojaponin E (1) and F (2), together with three known compounds were isolated from the dried herb of Leonurus japonicus Houtt., Lamiaceae. Their structures were determined based on extensive spectroscopic analyses. The absolute configurations of 1 and 2 were elucidated on the basis of experimental and calculated electronic circular dichroism spectra. In addition, compounds 1 and 2 exerted inhibition of LPS-induced PGE2 production in a dose-dependent manner at concentrations ranging from 5 to 20 µM.


Assuntos
Anti-Inflamatórios não Esteroides/farmacologia , Diterpenos/química , Diterpenos/farmacologia , Leonurus/química , Animais , Anti-Inflamatórios não Esteroides/administração & dosagem , Anti-Inflamatórios não Esteroides/química , Dicroísmo Circular , Dinoprostona/biossíntese , Relação Dose-Resposta a Droga , Avaliação Pré-Clínica de Medicamentos , Lipopolissacarídeos/farmacologia , Espectroscopia de Ressonância Magnética , Camundongos , Estrutura Molecular , Componentes Aéreos da Planta/química , Células RAW 264.7
15.
Zhongguo Zhong Yao Za Zhi ; 43(21): 4240-4247, 2018 Nov.
Artigo em Chinês | MEDLINE | ID: mdl-30583624

RESUMO

The qualitative analysis method of RRLC-Q-TOF-MS/MS was established for determine the chemical constituents in Qige Keli. Kramosil C18 column (4.6 mm×150 mm, 3.5 µm) was used at the temperature of 30 °C. The mobile phase was 0.2% formic acid and acetonitrile by gradient elution, with a flow rate at 1.0 mL·min⁻¹, and the injection volume was 10 µL. The high-resolution quadrupole time-flight mass spectrometry was used as detector with electrospray ion source in both positive and negative models. On the basis of medicinal materials, reference materials, literature reports, and mass spectrometry data, the chemical composition in the Qige Keli was identified. A total of 44 compounds were identified, including 3 flavonoids, 21 flavonoid glycosides, 8 organic acids, 6 lactones, and 3 saponins. The results laid the foundation for the quality control of Qige Keli and the further research on pharmacodynamic materials.


Assuntos
Medicamentos de Ervas Chinesas/química , Compostos Fitoquímicos/análise , Ácidos/análise , Flavonoides/análise , Glicosídeos/análise , Lactonas/análise , Saponinas/análise , Espectrometria de Massas por Ionização por Electrospray , Espectrometria de Massas em Tandem
16.
Zhongguo Zhong Yao Za Zhi ; 43(22): 4439-4449, 2018 Nov.
Artigo em Chinês | MEDLINE | ID: mdl-30593236

RESUMO

To analyze and identify the chemical components in Xingbei Zhike Keli by using ultra-performance liquid chromatography-quadrupole-time of flight mass spectrometry (UPLC-Q-TOF-MS/MS). The analysis was performed on Agilent Zorbax SB-C18(4.6 mm×250 mm, 5 µm) column, with methanol-0.08% formic acid solution (including 0.1% ammonium formate) as the mobile phase for gradient elution. The flow rate was 1 mL·min⁻¹ and column temperature was 30 °C. The MS spectrum was acquired in both negative and positive ion modes by using electron spray ionization (ESI). These components were further analyzed based on accurate m/z, secondary fragmentation and other information combined with reference substance and literature data. As a result, 87 compounds were successfully identified and predicted, including alkaloids, flavonoids, coumarins and saponins, of which 23 compounds were verified by comparing with reference substances. These results provide reference for the quality control of Xingbei Zhike Keli, and lay the foundation for elucidating their effective components and mechanism of action.


Assuntos
Medicamentos de Ervas Chinesas , Alcaloides , Cromatografia Líquida de Alta Pressão , Flavonoides , Espectrometria de Massas por Ionização por Electrospray , Espectrometria de Massas em Tandem
17.
Fitoterapia ; 131: 105-111, 2018 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-30339923

RESUMO

Five new homoisoflavonoid derivatives, including three meta-homoisoflavanes (1-3), one homoisoflavanone (4), and one homoisoflavan (5), along with five known analogues (6-10), were isolated from the red resin of Dracaena cochinchinensis (Chinese dragon's blood). Their structures were elucidated by analysis of spectroscopic data (1D and 2D NMR, IR, and HRESIMS). The absolute configuration of compound 1 was determined by single-crystal X-ray crystallographic analysis, and those of 2-5 were established on the basis of experimental and computed ECD data. Compounds 4, 6, and 9 exhibited moderate inhibition of nitric oxide production in lipopolysaccharide-stimulated BV-2 microglial cells with IC50 values of 60.4-75.6 µM.


Assuntos
Dracaena/química , Isoflavonas/isolamento & purificação , Resinas Vegetais/química , Animais , Linhagem Celular , Cristalografia por Raios X , Camundongos , Microglia/efeitos dos fármacos , Estrutura Molecular , Óxido Nítrico/metabolismo , Compostos Fitoquímicos/isolamento & purificação , Extratos Vegetais/química
18.
Se Pu ; 36(5): 464-473, 2018 May 08.
Artigo em Chinês | MEDLINE | ID: mdl-30136488

RESUMO

A two-dimensional reversed-phase liquid chromatography (2D-RPLC) method was established to separate lignan components and pure compounds from Schisandra chinensis. This method was based on the modules of separation-enrichment and self-developed with independent intellectual property rights. First, a C18 column (250 mm×4.6 mm, 5 µm) was used as the analytical column. A water-methanol mixture was selected as the mobile phase. Separation resolution and retention time were selected as indexes. Gradient chromatography of the lignan extracts was repeated four times and the information was input into XTool, a chromatographic separation software. The conditions for the first-and second-dimensional chromatographic separation were optimized by XTool. Then, linear amplification was used for preparative chromatography. C18 column (250 mm×30 mm, 10 µm) was selected as the first-and second-dimensional separation column. The C18 columns (80 mm×30 mm, 10 µm) were selected as enriching columns, and water was chosen as the diluent solution. Lignans from Schisandra chinensis were separated and purified by 2D-RPLC. Finally, nine lignan components were obtained by the first-dimensional separation. Totally, 20 high-purity compounds, containing six monomers, were obtained by the second-dimensional separation. Experimental results showed that this method has good reproducibility. This method thus allows for the systematic separation of lignans from Schisandra chinensis.


Assuntos
Lignanas/isolamento & purificação , Schisandra/química , Cromatografia Líquida de Alta Pressão , Cromatografia de Fase Reversa , Reprodutibilidade dos Testes
19.
Zhongguo Zhong Yao Za Zhi ; 43(10): 2118-2122, 2018 May.
Artigo em Chinês | MEDLINE | ID: mdl-29933680

RESUMO

Focal cerebral ischemia reperfusion is an essential process during ischemic stroke. The apoptosis of vascular endothelial cells induced by ischemia/reperfusion (I/R) injury is an important cause for brain injury after focal cerebral ischemia. Longxuetongluo capsule (LTC) has been used for the treatment of ischemic stroke in clinic. However, its underlying action mechanism is still unclear. This study aimed to verify the protective effect and mechanisms of LTC on HUVEC cells against oxygen-glucose deprivation/reoxygenation (OGD/R) injury through MTT, LDH, flow cytometry, AO/EB staining and western blot assays. As a result, OGD/R significantly decreased the viability of HUVEC cells, which was significantly improved by LTC. LDH release assay showed that OGD/R significantly increased the lactate dehydrogenase (LDH) release, and LTC dramatically reduced the OGD/R-induced LDH release. Further mechanism study indicated that LTC dose-dependently inhibited the cleavage of PARP, caspase 3, and caspase 9 induced by OGD/R, suggesting that LTC could inhibit the activation of caspase 3/9 apoptosis pathway in the OGD/R-induced apoptosis of HUVEC cells. In conclusion, LTC could protect HUVEC cells against OGD/R injury by inhibiting the activation of mitochondria-related caspase 3/9 apoptosis pathway.


Assuntos
Apoptose/efeitos dos fármacos , Medicamentos de Ervas Chinesas/farmacologia , Células Endoteliais/efeitos dos fármacos , Traumatismo por Reperfusão , Sobrevivência Celular , Glucose , Humanos , Oxigênio
20.
Chin J Nat Med ; 16(5): 366-374, 2018 May.
Artigo em Inglês | MEDLINE | ID: mdl-29860998

RESUMO

Analysis errors can occur in the desorbing process of ginkgo diterpene lactone meglumine injection (GDMI) by a conventional analysis method, due to several factors, such as easily crystallized samples, solvent volatility, time-consuming sample pre-processing, fixed method, and offline analysis. Based on risk management, near-infrared (NIR) and mid-infrared (MIR) spectroscopy techniques were introduced to solve the above problems with the advantage of timely analysis and non-destructive nature towards samples. The objective of the present study was to identify the feasibility of using NIR or MIR spectroscopy techniques to increase the analysis accuracy of samples from the desorbing process of GDMI. Quantitative models of NIR and MIR were established based on partial least square method and the performances were calculated. Compared to NIR model, MIR model showed greater accuracy and applicability for the analysis of the GDMI desorbing solutions. The relative errors of the concentrations of Ginkgolide A (GA) and Ginkgolide B (GB) were 2.40% and 2.89%, respectively, which were less than 5.00%. The research demonstrated the potential of the MIR spectroscopy technique for the rapid and non-destructive quantitative analysis of the concentrations of GA and GB.


Assuntos
Química Farmacêutica/métodos , Ginkgolídeos/análise , Meglumina/análise , Gestão de Riscos , Espectrofotometria Infravermelho/normas , Química Farmacêutica/normas , Composição de Medicamentos/normas , Medicamentos de Ervas Chinesas/análise , Medicamentos de Ervas Chinesas/química , Medicamentos de Ervas Chinesas/normas , Ginkgolídeos/química , Ginkgolídeos/normas , Injeções , Lactonas/análise , Análise dos Mínimos Quadrados , Meglumina/química , Meglumina/normas , Reprodutibilidade dos Testes
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