Utilization of ion-air reagents in a reversed-phase chromatographic system allows solving a number of problems related to the separation of purine and pyrimidine derivatives. Simultaneous analysis of nucleotides, nucleosides and their bases was carried out by acetonitrile gradient elution using tetrabutyl ammonium phosphate as a counterion in the mobile phase. Besides, optimal conditions were selected for isocratic separation of adenine nucleotides and their metabolites. Furthermore, isocratic separation of certain purines and pyrimidines was achieved by modifying the stationary C18-phase with pentane- and heptane sulphonic acids.
Download full-text PDF |
Source |
---|
J Cancer
January 2025
Jiangsu Key Laboratory of Drug Screening, China Pharmaceutical University, Nanjing, 210009, China.
Lung cancer is one of the most harmful cancers in the world, endangering the lives and health of many people. Although there are various methods to treat lung cancer at present, but lung cancer is asymptomatic in the early stages and has a high recurrence rate after late treatment which make it difficult to cure with conventional treatments. Drug combinations for the treatment of lung cancer have been used in many clinical studies.
View Article and Find Full Text PDFNat Commun
December 2024
Living Systems Institute, University of Exeter, Stocker Road, Exeter, Devon, EX4 4QD, UK.
The radical pair mechanism accounts for the magnetic field sensitivity of a large class of chemical reactions and is hypothesised to underpin numerous magnetosensitive traits in biology, including the avian compass. Traditionally, magnetic field sensitivity in this mechanism is attributed to radical pairs with weakly interacting, well-separated electrons; closely bound pairs were considered unresponsive to weak fields due to arrested spin dynamics. In this study, we challenge this view by examining the FAD-superoxide radical pair within cryptochrome, a protein hypothesised to function as a biological magnetosensor.
View Article and Find Full Text PDFSci Rep
December 2024
Graduate School of Life Sciences, Ritsumeikan University, Kusatsu, Shiga, 525-8577, Japan.
A circadian clock is reconstituted in vitro by incubating three proteins, KaiA, KaiB, and KaiC from the non-nitrogen-fixing cyanobacterium Synechococcus elongatus PCC 7942 in the presence of ATP. Leptolyngbya boryana is a filamentous cyanobacterium that grows diazotrophically under microoxic conditions. Among the aforementioned proteins, KaiC is the main clock oscillator belonging to the RecA ATPase superfamily.
View Article and Find Full Text PDFNanomaterials (Basel)
December 2024
Department of Chemistry and Chemical Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China.
Cisplatin-based platinum compounds are important clinical chemotherapeutic agents that participate in most tumor chemotherapy regimens. Through density-functional theory calculations, the formation and stability of the inorganic oxide carrier, the mechanisms of the hydrolysis reaction of the activated platinum compound, and its binding mechanism with DNA bases can be studied. The higher the oxidation state of Pt (II to IV), the more electrons transfer from the magnesia-gold composite material to the platinum compound.
View Article and Find Full Text PDFInt J Med Mushrooms
December 2024
School of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan 250355, People's Republic of China; Shandong Provincial Collaborative Innovation Center for Quality Control and Construction of the Whole Industrial Chain of Traditional Chinese Medicine, Jinan, Shandong, 250355, People's Republic of China.
In this work, magnetic molecularly imprinted polymer (MMIP) capable of selectively recognizing and adsorbing cordycepin was prepared. The MMIP was prepared using cordycepin as the template molecule, methacrylic acid and acrylamide as the functional monomer and ethylene glycol dimethacrylate as the crosslinker. The MMIP was analyzed using various techniques including transmission electron microscopy, thermogravimetric analysis, Fourier transform infrared spectroscopy, vibrating sample magnetometer and x-ray diffraction.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!