p-Hydroxybenzaldehyde, a component of soil humic substances, was ozonated and chlorinated. The ether extract and the residue were subjected to the Ames assay; mutagenic activities were identified. The non-ionic resin CSP800 and the anion exchange resin CHPA25 were used for separation of mutagenic compounds. The compounds in the water layer were not adsorbed on CSP800 or CHPA25 and exhibited strong mutagenic activity. Mutagenic activity was reduced as the added chlorine was increased. Ether extracts were analyzed by gas chromatography-mass spectrometry (GC-MS) and chloral, 1,3-dichloro-2-propanone, 1,2,3-trichloro-1-propene, tetrachloroethylene and 1,1,1,3,3-pentachloro-2-propanone were identified as mutagenic compounds.
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http://dx.doi.org/10.1016/0048-9697(91)90140-a | DOI Listing |
Environ Toxicol Chem
January 2025
School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou, China.
N-Nitrosamines are a class of compounds that includes the potent mutagenicity and carcinogenicity of many of its members and is distributed widely throughout the human environment. DNA alkylation by their diazonium ions formed metabolically acts as a molecular initiating event (MIE) that links molecular chemistry to mutagenicity. However, the regiochemistry for diazonium ions reacting with DNA bases is still under debate.
View Article and Find Full Text PDFAm J Chin Med
January 2025
School of Pharmacy, Nantong University, 9 Seyuan Road, Nantong 226019, P. R. China.
Ginkgolic acids (GAs) are distinctive secondary metabolites of () primarily found in its leaves and seeds, with the highest concentration located in the exotesta. GAs are classified as long-chain phenolic compounds, and exhibit structural similarities to lignoceric acid. Their structural diversity arises from variations in the length of side chains and their number of double bonds, resulting in six distinct forms within extracts (GBE).
View Article and Find Full Text PDFDNA Repair (Amst)
January 2025
Department of Chemistry and Stanford University, Stanford, CA 94305, United States. Electronic address:
A potentially promising approach to targeted cancer prevention in genetically at-risk populations is the pharmacological upregulation of DNA repair pathways. SMUG1 is a base excision repair enzyme that ameliorates adverse genotoxic and mutagenic effects of hydrolytic and oxidative damage to pyrimidines. Here we describe the discovery and initial cellular activity of a small-molecule activator of SMUG1.
View Article and Find Full Text PDFJ Appl Toxicol
January 2025
Laboratory of Genetic Toxicology, Lutheran University of Brazil (ULBRA), Canoas, Rio Grande do Sul, Brazil.
The widespread use of electronic devices has led to increased blue light exposure, highlighting the need for effective radiation blockers with blue light protection. Two synthetic 2-(2'-hydroxyphenyl)benzoxazole derivatives named azo-4'-benzoxazole and azo-5'-benzoxazole have shown an unprecedented blue light absorption capacity but had not been subjected to a safety evaluation. This study aimed to evaluate the cytotoxic, genotoxic, and mutagenic activities of these compounds.
View Article and Find Full Text PDFMol Biochem Parasitol
January 2025
Post-graduate Program in Pharmaceutical Sciences, Federal University of Ceará, Fortaleza - CE, Brazil; Fundação Oswaldo Cruz, Fiocruz, Fiocruz Ceará, Eusébio - CE, Brazil; Northeast Network of Biotechnology (RENORBIO), State University of Ceará (UECE), Fortaleza - CE, Brazil.
Globally, an estimated 1 billion people reside in endemic areas, and over 12 million individuals are infected with leishmaniasis. Despite its prevalence, leishmaniasis continues to be a neglected disease, mainly affecting underdeveloped countries. In Brazil, the available treatments are pentavalent antimonials and Amphotericin B, which are outdated, toxic, require prolonged parenteral administration and have limited efficacy.
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