Application of Advanced High-Resolution Mass Spectrometric Techniques for the Analysis of Losartan Potassium Drug Substance Degradation Products: From Nontargeted to Targeted Screening.

Advances in techniques for quality analysis allow for a more detailed examination of drug impurities. High-resolution mass spectrometry (HRMS) contributes to detecting both known and unknown impurities. In this study, a combination of a nontargeted and targeted screening approach was established and applied to the detailed degradation profile of the losartan potassium (LP) drug substance.

Structural elucidation of a capsular polysaccharide from Bacteroides uniformis and its ameliorative impact on DSS-induced colitis in mice.

Capsular polysaccharides derived from Bacteroides species have emerged as potential mitigators of intestinal inflammation in murine models. However, research on capsular polysaccharides from B. uniformis, a Bacteroides species with reduced abundance in colons of patients with ulcerative colitis, remains scarce.

A Rapid and Accurate UHPLC Method for Determination of Monosaccharides in Polysaccharides of Different Sources of Radix Astragali and Its Immune Activity Analysis.

With the escalating demand for Astragalus polysaccharides products developed from Radix Astragali (RA), the necessity for quality control of polysaccharides in RA has become increasingly urgent. In this study, a specific method for the simultaneous determination of seven monosaccharides in polysaccharides extracted from Radix Astragali (RA) has been developed and validated using ultra-performance liquid chromatography equipped with an ultraviolet detector (UHPLC-UV) for the first time. The 1-phenyl-3-methyl-5-pyrazolone (PMP) derivatizations were separated on a C18 column (Waters ACQUITY, Milfor, MA, USA, 1.

Classification and Authentication of Lonicerae Japonicae Flos and Lonicerae Flos by Using H-NMR Spectroscopy and Chemical Pattern Recognition Analysis.

Lonicerae japonicae flos and Lonicerae flos are increasingly widely used in food and traditional medicine products around the world. Due to their high demand and similar appearance, they are often used in a confused or adulterated way; therefore, a rapid and comprehensive analytical method is highly required. In this case, the comparative analysis of a total of 100 samples with different species, growth modes, and processing methods was carried out by nuclear magnetic resonance (H-NMR) spectroscopy and chemical pattern recognition analysis.

Integrating Anti-Influenza Virus Activity and Chemical Pattern Recognition to Explore the Quality Evaluation Method of Lonicerae Japonicae Flos.

Lonicerae japonicae flos (LJF, Thunb.) is adopted as a core herb for preventing and treating influenza. However, the anti-influenza virus components of LJF and the impact of quality-affecting factors on the anti-influenza activity of LJF have not been systematically investigated.

Discrimination of Lonicerae Japonicae Flos according to species, growth mode, processing method, and geographical origin with ultra-high performance liquid chromatography analysis and chemical pattern recognition.

Lonicerae japonicae flos (LJF, Lonicera japonica Thunb.) is often confused and/or adulterated with Lonicerae flos (LF, Lonicera macrantha (D.Don) Spreng.

Chemical characteristics of Rhodiola Crenulata and its mechanism in acute mountain sickness using UHPLC-Q-TOF-MS/MS combined with network pharmacology analysis.

Ethnopharmacological Relevance: Rhodiola crenulata (Hook.f. & Thomson) H.

Chemical Pattern Recognition for Quality Analysis of Lonicerae Japonicae Flos and Lonicerae Flos Based on Ultra-High Performance Liquid Chromatography and Anti-SARS-CoV2 Main Protease Activity.

Lonicerae japonicae flos (L. japonicae flos, Thunb.) is one of the most commonly prescribed botanical drugs in the treatment or prevention of corona virus disease 2019.

The Study of Steaming Durations and Temperatures on the Chemical Characterization, Neuroprotective, and Antioxidant Activities of .

(PN) is one of the most valuable traditional Chinese medicines and has extensive pharmacological effects. Recent studies demonstrated that PN exhibited pharmacological effect related to Alzheimer's disease (AD). However, whether steaming process can boost its anti-AD activity is still unexplored.

Application of UHPLC Fingerprints Combined with Chemical Pattern Recognition Analysis in the Differentiation of Six Species.

, especially and , is an increasingly widely used traditional medicine or dietary supplement in Asian and western countries. Because of the phytochemical diversity and difference of therapeutic efficacy among species, it is crucial to accurately identify them. In this study, a simple and efficient method of the classification of , , and their confusable species (, , and ) was established by UHPLC fingerprints combined with chemical pattern recognition analysis.

Developing a novel and simple biosensor for Cystatin C as a fascinating marker of glomerular filtration rate with DNase I-aided recycling amplification strategy.

Cystatin C (Cys C) has been proposed as a fascinating glomerular filtration rate (GFR) marker for early detection of acute kidney injury and chronic kidney disease. However, most of traditional methods for Cys C detection are immunoassays, which was tedious to perform and unfriendly for economics. In this work, a novel and simple biosensor for the sensitive measurement of Cys C via DNase I-aided recycling amplification strategy was successfully constructed based on the graphene oxide (GO) and fluorophore-labelled aptamer, which can be used to the early prediction of kidney injury.

and Anti-AChE and Antioxidative Effects of Extract: A Potential Candidate for Alzheimer's Disease.

Acetylcholinesterase (AChE) inhibition and antioxidants are two common strategies for the treatment in the early stage of Alzheimer's Disease (AD). In this study, extracts from nine traditional Chinese medical (TCM) herbs were tested for anti-AChE activity by Ellman's microplate assay and cytotoxicity by CCK-8. Based on its excellent AChE inhibition effect and its lowest cytotoxicity, (SC) extract was selected to do the mechanism research.

[A liquid chromatography-mass spectrometry-based metabolomic study on the changes of intracellular lipid metabolism regulated by Pokemon].

Pokemon, a transcriptional repressor, inhibits the transcription of tumor suppressor genes and promotes tumor formation by affecting chromatin recombination or binding directly to the tumor suppressor genes. In this study, the mechanism behind the Pokemon regulation of liver cancer cell metabolism was evaluated using liquid chromatography-mass spectrometry (LC-MS)-based metabolomics. Pokemon-overexpressing HL7702 cells were obtained by lipofection.

Evaluation of bisphenol A exposure induced oxidative RNA damage by liquid chromatography-mass spectrometry.

Highlighted evidence suggests the possible implication of bisphenol A (BPA) exposure on a variety of biological functions, such as DNA damage. Similar to DNA, exposed to BPA may also have potential risks to RNA damage due to its induction of reactive oxygen species. However, there are no related research reports about such health risks of BPA.

HPLC-MS/MS determination of flavonoids in Gleditsiae Spina for its quality assessment.

Gleditsiae Spina, the thorn of Gleditsia sinensis Lam., has been used as an anti-inflammatory, anti-tumor, and anti-bacterial traditional medicine for hundreds of years in China. This study used high-performance liquid chromatography and tandem mass spectrometry combined with chemometric methods to allow the fast and accurate identification and quantification of the flavonoids compounds in Gleditsiae Spina, and created reliable criteria for accurate identification of Gleditsiae Spina and its adulterants.

[Fingerprint of Solanum nigrum L. from different habitats using high performance liquid chromatography with evaporative light-scattering detection].

Solanum nigrum L. contains a variety of active ingredients. It has been applied broadly in clinical practice.

Urinary profiling of cis-diol-containing metabolites in rats with bisphenol A exposure by liquid chromatography-mass spectrometry and isotope labeling.

Exposure to bisphenol A (BPA), an environmental contaminant, has been linked to metabolic disorders. However, there are no reports describing the effects of BPA on the profiling of cis-diol metabolites. It is challenge to detect these metabolites in biological samples because of their low abundance, high polarity and serious matrix interference.

A novel method of liquid chromatography-tandem mass spectrometry combined with chemical derivatization for the determination of ribonucleosides in urine.

Ribonucleosides are the end products of RNA metabolism. These metabolites, especially the modified ribonucleosides, have been extensively evaluated as cancer-related biomarkers. However, the determination of urinary ribonucleosides is still a challenge due to their low abundance, high polarity and serious matrix interferences in urine samples.

Investigation of Pokemon-regulated proteins in hepatocellular carcinoma using mass spectrometry-based multiplex quantitative proteomics.

Pokemon is a transcription regulator involved in embryonic development, cellular differentiation and oncogenesis. It is aberrantly overexpressed in multiple human cancers including Hepatocellular carcinoma (HCC) and is considered as a promising biomarker for HCC. In this work, the isobaric tags for relative and absolute quantitation (iTRAQ)-based quantitative proteomics strategy was used to investigate the proteomic profile associated with Pokemon in human HCC cell line QGY7703 and human hepatocyte line HL7702.

Pharmacokinetics and metabolite identification of a novel VEGFR-2 and Src dual inhibitor 6-chloro-2-methoxy-N-(2-methoxybenzyl) acridin-9-amine in rats by liquid chromatography tandem mass spectrometry.

A novel VEGFR-2 and Src dual inhibitor, 6-Chloro-2-methoxy-N-(2-methoxybenzyl) acridin-9-amine (MBAA), is a 9-aminoacridine derivative, but its pharmacokinetics and metabolism in body remain unknown. Using liquid chromatography tandem electrospray ionization mass spectrometry with the multiple reaction monitoring modes, we developed and validated a simple, rapid, sensitive and accurate technology for analyses of MBAA in the rat plasma, urine and bile. The micro samples were quickly prepared by 96-well plate.

Metabolomics study of alcohol-induced liver injury and hepatocellular carcinoma xenografts in mice.

Alcohol abuse is one of the major causes of liver injury and a promoter for hepatocellular carcinoma (HCC). To understand the disease-associated metabolic changes, we investigated and compared the profiles of metabolites in nude mice with alcohol-induced liver injury or bearing a HCC xenograft (HCCX). Alcohol-induced liver injury was achieved by daily administration of grain liquor, and HCC xenografts were generated by subcutaneous inoculation of HepG2 cells in nude mice.

Copper-catalyzed aerobic oxidative intramolecular alkene C-H amination leading to N-heterocycles.

A copper-catalyzed aerobic oxidative intramolecular alkene C-H amination has been developed using readily available substituted 3-benzylidene-2-pyridin-2-ylmethyl-2,3-dihydro-isoindol-1-ones as the starting materials, and the corresponding N-heterocycles were obtained in good to excellent yields. This method should provide a new and useful strategy for constructing N-heterocycles.

Exploration of acridine scaffold as a potentially interesting scaffold for discovering novel multi-target VEGFR-2 and Src kinase inhibitors.

VEGFR-2 and Src kinases both play important roles in cancers. In certain cancers, Src works synergistically with VEGFR-2 to promote its activation. Development of multi-target drugs against VEGFR-2 and Src is of therapeutic advantage against these cancers.

Separation, identification and quantification of tetrodotoxin and its analogs by LC-MS without calibration of individual analogs.

We report here a simple and rapid method of separation, identification and quantification of tetrodotoxin (TTX) and its analogs in partially purified extract by LC-MS. Except for the main component calibration of individual components was not necessary. TTX and four of its analogs in the puffer fish extract were identified and quantified.

Copper-catalyzed domino synthesis of quinazolinones via Ullmann-type coupling and aerobic oxidative C-H amidation.

An efficient copper-catalyzed approach to quinazolinone derivatives has been developed, and the protocol uses cheap and readily available substituted 2-halobenzamides and (aryl)methanamines as the starting materials as well as economical and environmentally friendly air as the oxidant. This can be the first example of constructing N-heterocycles via sequential Ullmann-type coupling under air and aerobic oxidative C-H amidation.