Objective: To establish HPLC chromatographic fingerprint of Citrus reticulata Blanco cv. Dahongan.
Methods: The experimental condition of the RP-HPLC method was as follows: Angilent Zorbax C18 column (4.6 mm x 250 mm, 5 microm), with linear gradient elution using (A) methanol and (B) water; The flow rate was 1.0 ml/min, and the injected volume was 20 microl, detected wavelength was 283 nm.
Results: Under the qualitative conditions we determined different samples of Citrus reticulata Blanco cv. Dahongan. There were 11 common peaks in chromatographic.
Conclusions: According to analyze and contrast the relative retention values and relative peak area in chromatographic fingerprint, we establish HPLC chromatographic fingerprint of Citrus reticulata Blanco cv. Dahongan to provide a scientific basement for the quality evaluation of it.
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J Chromatogr A
January 2025
National Institute of Oceanography and Fisheries, NIOF, Cairo, Egypt. Electronic address:
The comprehensive identification of peaks in untargeted lipidomics using LC-MS/MS remains a significant challenge. Confidence in lipid annotation can be greatly improved by integrating a highly accurate machine learning-based retention time prediction model. Such an approach enables the identification of lipids for understanding pathogenic mechanisms, biomarker discovery, and drug screening.
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School of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou 310053, People's Republic of China.
Proteolysis-targeting chimeras (PROTACs) are heterobifunctional molecules that target undruggable proteins, enhance selectivity and prevent target accumulation through catalytic activity. The unique structure of PROTACs presents challenges in structural identification and drug design. Liquid chromatography (LC), combined with mass spectrometry (MS), enhances compound annotation by providing essential retention time (RT) data, especially when MS alone is insufficient.
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Department of Inorganic Chemistry, Analytical Chemistry and Electrochemistry, Faculty of Chemistry, Silesian University of Technology, Gliwice, Poland.
Pesticides are commonly found in plant-based foods, which inevitably reduces food quality and poses significant health risks to consumers. The extensive variety of crops and the wide range of pesticides used means that no single analytical approach can provide clear and comprehensive information on the pesticide-protection status of a crop. Since most pesticide analyses in food rely on chromatographic techniques combined with various MS platforms, this article focuses exclusively on LC-MS and GC-MS system methodologies.
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Department of Pharmaceutical Analysis, School of Pharmacy, Hebei Medical University, Shijiazhuang, China.
A novel dual-wavelength ultrahigh performance liquid chromatography (UHPLC) fingerprint was established, 56 common peaks were confirmed and attributed to the source of the medicinal materials, and 13 chromatographic peaks of them were identified by UHPLC quadrupole time-of-flight (Q-TOF)-MS/MS and UHPLC-UV method. Furthermore, a simple and sensitive HPLC-quadrupole trap (Q-TRAP)-MS/MS was developed for the simultaneous determination of 16 active components with electrospray ionization (ESI) source switching between positive and negative modes in a single run. The above two methods were successfully applied for the quality evaluation of Guanxinjing capsule (GXJC).
View Article and Find Full Text PDFACS Omega
December 2024
Department of Chemistry, Humboldt Universität zu Berlin, Brook-Taylor-Str. 2, Berlin 12489, Germany.
In this study, we extended a previously developed one-pot double derivatization reaction to establish the first routine isotope-coded multiplex derivatization for vitamin D and its metabolites for application in clinical environments, using commercial reagents, without the need for specialized reagents and advanced synthesis requirements. The original derivatization process consisted of using both a Cookson-type reagent and derivatization of hydroxyl groups. Initially, the analytes are derivatized by a Diels-Alder reaction using 4-phenyl-1,2,4-triazoline-3,5-dione (PTAD), followed by acetylation using acetic anhydride, catalyzed by 4-dimethylaminopyridine at room temperature.
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