Biomimetic oxidation using synthetic iron-porphyrin (F TPPFeCl) as a catalyst eliminated a xylene moiety of the fungicide mandestrobin, uniformly labeled with carbon-14 at the benzyl ring, to produce the corresponding radiolabeled metabolite 1. This reaction mechanism was investigated by identifying chemical structures of intermediate 5 and p-xyloquinone derivatives 6 and 7, as by-products. Optimization of reaction factors based on the mechanism improved the yield of 1 from mandestrobin up to 87%. Finally, various carbon-14 labeled metabolites of mandestrobin were prepared from 1.
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http://dx.doi.org/10.1002/jlcr.4044 | DOI Listing |
Cancer Chemother Pharmacol
December 2024
Department of Pharmacy, The First Affiliated Hospital of Soochow University, Suzhou, 215031, China.
Purpose: The study aims to investigate the absorption, metabolism, and excretion of donafenib, a deuterated derivative of sorafenib, in healthy Chinese male volunteers.
Methods: Six healthy Chinese male volunteers were administered a single oral dose of 300 mg donafenib containing 120 µCi of [14 C]-donafenib. The study involved collecting and analyzing plasma, urine, and feces samples to determine the recovery and distribution of total radioactivity, identify metabolites, and assess the metabolic pathways of donafenib.
Genes (Basel)
November 2024
Konan Laboratory for Oligonucleotide Therapeutics (KOLOT), 7-1-20 Minatojima-minamimachi, Chuo-ku, Kobe 650-0047, Hyogo, Japan.
: Riboswitches are functional nucleic acids that regulate biological processes by interacting with small molecules, such as metabolites, influencing gene expression. Artificial functional nucleic acids, including deoxyribozymes, have been developed through in vitro selection for various catalytic functions. In a previous study, an l-histidine-dependent deoxyribozyme was identified, exhibiting RNA cleavage activity in the presence of l-histidine resembling ribonuclease catalytic mechanisms.
View Article and Find Full Text PDFSci Total Environ
December 2024
Department of Environmental Engineering and Earth Sciences, Clemson University, Clemson, SC 29634, USA. Electronic address:
In fractured rock aquifers contaminated with trichloroethene (TCE), the extent of groundwater plumes is impacted by degradation occurring within the rock matrix. The objective of this study was to evaluate TCE degradation in rock samples from three sites where in situ conditions may favor natural or enhanced attenuation. Intact rock core microcosms (94 total) were used to assess in situ conditions and enhancement by addition of lactate or lactate + sulfate.
View Article and Find Full Text PDFEcotoxicol Environ Saf
November 2024
Center of Nuclear Energy in Agriculture, University of São Paulo, Av. Centenário 303, Piracicaba, SP 13400-970, Brazil.
Sci Total Environ
December 2024
IRSN, PSE-ENV/STAAR/LRTA, BP 159, CEA Cadarache, 13115 Saint-Paul-les-Durance, France.
Carbon-14 (C) has a natural origin but is also anthropogenically released from civil nuclear facilities. Due to its long decay period (half-life: 5700 ± 30 years), it is a persistent radionuclide in the environment. In rivers, the complex speciation of carbon makes the fate of industrial C difficult to track.
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