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1.
Nat Prod Bioprospect ; 2020 May 15.
Artigo em Inglês | MEDLINE | ID: mdl-32415420

RESUMO

Betulin (BE) has exceedingly become a potential natural product, providing multiple pharmacological and biological activities, including anti-cancer, anti-viral, and anti-inflammatory benefits. Previous research indicated that the solvatomorphism of BE can easily occur through crystallization with different organic solvents. This property of BE can directly affect its extraction, isolation, and preparation process. In this study, a system of thermogravimetry (TG)-differential thermal analysis (DTA) coupled with mass spectrometry (MS) with electron ionization (EI) and photoionization (PI) capability, equipped with the skimmer-type interface (i.e., skimmer-type interfaced TG-DTA-EI/PI-MS system), as a real-time and onsite analysis technique, was employed. Then, four solvatomorphs of BE, namely, with pyridine and water (A), sec-butanol (B), n,n-dimethylformamide (DMF) (C), and isopropanol (V), were analyzed for the first time. Finally, five kinds of the main volatile gaseous species, including H2O, pyridine, sec-butanol, DMF, and isopropanol, were identified clearly. Furthermore, the multi-step desolvation processes of the four solvatomorphs of BE were revealed by this system for the first time. This system showed great potential for the rapid and accurate analysis of various solvatomorphs of natural products.

2.
Biochem Biophys Res Commun ; 525(3): 759-766, 2020 May 07.
Artigo em Inglês | MEDLINE | ID: mdl-32145915

RESUMO

Formononetin (FN), a methoxy isoflavone abundant in many plants and herbs, has been evidently proven to possess multiple medicinal properties. Our study aimed to clarify the impact of FN on myocardial ischemia/reperfusion (I/R) injury (MIRI) and the involved mechanism. A rat model of MIRI was produced by ligation and loosening of the left anterior descending (LAD) branch of the coronary artery. Rats received 10 and 30 mg/kg of FN when the reperfusion started. At 24 h after surgery, cardiac function, infarct size, and sera levels of the cardiac markers and inflammatory mediators were measured. To mimic the inflammasome activation in cardiomyocytes, neonatal rat cardiomyocytes (NRCMs) were cultured and treated with lipopolysaccharide (LPS) plus nigericin. Cell death and reactive oxygen species (ROS) were determined. Myocardial expression and activation of the nucleotide-binding domain and leucine-rich repeat-containing protein 3 (NLRP3) inflammasome in rats were examined by western blotting. The level of thioredoxin interacting protein (TXNIP)-NLRP3 interaction was assessed. FN notably attenuated cardiac dysfunction, infarct size, release of cardiac markers, and elevation of TNF-α, IL-1ß, and IL-6. FN alleviated LPS plus nigericin-induced injury and ROS increase in NRCMs. Western blotting revealed that FN suppressed the activation of NLRP3 inflammasome and TXNIP-NLRP3 interaction in rats. These findings indicate that FN ameliorated MIRI in rats and inhibited the activation of the NLRP3 inflammasome, at least partially, attributable to suppression of the ROS-TXNIP-NLRP3 pathway.

3.
Zhongguo Zhong Yao Za Zhi ; 41(15): 2861-2863, 2016 Aug.
Artigo em Chinês | MEDLINE | ID: mdl-28914029

RESUMO

This study was performed to systematically investigate the polymorphism of shikimic acid. Through optimizing the recrystallization solvent, solvent volume, recrystallization temperature, time and pressure, three crystal forms were discovered and prepared. The differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), X-ray powder diffraction (PXRD) and infrared spectrometry (IR) were used to characterize these solid states. Furthermore, the influencing factor experiments were used to explore the stability of these polymorphisms and the transformation among them. Three new polymorphisms were prepared and identified. The results indicated that only PXRD could identify different polymorphisms and there was no solvent in all three crystal forms. The composition, thermodynamic property and transformation of these crystal forms were described in this work. Furthermore, an effective method for qualitative analysis of these crystal forms was established.


Assuntos
Ácido Chiquímico/química , Varredura Diferencial de Calorimetria , Cristalização , Solubilidade , Termogravimetria , Difração de Raios X
4.
Zhongguo Ying Yong Sheng Li Xue Za Zhi ; 20(4): 389-92, 2004 Nov.
Artigo em Chinês | MEDLINE | ID: mdl-21158124

RESUMO

AIM: To investigate the effects of glycyrrhiza decoction on migrating myoelectric complex (MMC) and gastrointestinal hormone in small intestine in rats. METHODS: We observed MMC cycle,phase Ill duration,fast wave numbers of phase III of MMC in one minute, fast wave numbers of one cluster in phase III of MMC of small intestine of glycyrrhiza group and control group rats with electrophysiology method, and immunohistochemistry to examine relative content of serotonin (5-HT), substance p(SP) and vasoactive intestinal polypeptide (VIP) in small intestinal chromophil (EC) and myenteric nerve plexus in small intestine of control group and glycyrrhiza group rats. RESULTS: Compared glycyrrhiza group with control group,we found that glycyrrhiza was able to decrease fast wave numbers in one minute and fast wave numbers in one cluster in phase III of MMC of small intestine (P < 0.05), and evidently extend small intestinal cycle of MMC (P < 0.05), it also shortened the phase III III duration (P < 0.05) or made the phase III of MMC absent. Compared glycyrrhiza group with control group it was indicated that content of 5-HT in small intestinal mucous membrane and myenteric nerve plexus was evidently decreased (P < 0.05), and content of SP in myenteric nerve plexus of small intestine of rats was evidently decreased (P < 0.05), and content of VIP in small intestine of rats was evidently increased (P < 0.05). CONCLUSION: Glycyrrhiza is able to inhibit small intestinal motility, this inhibition is related with the amount of 5-HT, SP, VIP secreted by small intestinal mucous membrane of rats.


Assuntos
Medicamentos de Ervas Chinesas/farmacologia , Motilidade Gastrointestinal/efeitos dos fármacos , Glycyrrhiza , Intestino Delgado/efeitos dos fármacos , Animais , Eletromiografia , Motilidade Gastrointestinal/fisiologia , Intestino Delgado/fisiologia , Ratos , Ratos Sprague-Dawley , Serotonina/análise , Substância P/análise , Peptídeo Intestinal Vasoativo/análise
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