Consulta: subjectFacets:"Xanthine oxidase"
Registros recuperados: 2
Data/hora: 05/06/2024 09:21:24

Catabolism of caffeine and purification of a xanthine oxidade responsible for methyluric acids production in Pseudomonas putida L
Provedor de dados: 59
Autores: Yamaoka-Yano,Dirce Mithico; Mazzafera,Paulo.
Caffeine catabolism and a xanthine oxidase involved in the alkaloid breakdown were studied in Pseudomonas putida L, a strain displaying high ability to grow on this substrate. Cells cultured with unlabelled caffeine and 14C labeled caffeine and xanthine showed that this alkaloid was broken-down via theobromine/paraxanthine -&amp;gt; 7-methylxanthine -&amp;gt; xanthine -&amp;gt; uric acid -&amp;gt; allantoin -&amp;gt; allantoic acid. Methyluric acids were formed from the oxidation of theobromine, paraxanthine and 7-methylxanthine, although no bacterial growth was observed on these compounds, indicating that this might be due to a wide substrate specificity of xanthine oxidase. This was confirmed by activity staining in PAGE where activity was observed with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caffeine; Methylpurines; Methyluric acids; Pseudomonas; Xanthine oxidase.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37141999000100013

Xanthine oxidase activity in patients with age-related cataract associated with hypertension
Provedor de dados: 56
Autores: Kisic,B.; Miric,D.; Zoric,L.; Rasic,J.V.; Grbic,R.; Popovic,Lj.M.; Arsic,A.M.
Reactive oxygen species and lipid peroxidation are important factors that contribute to the development of age-related cataract. The study included 130 patients with age-related cataract, 69 of whom were diagnosed with hypertension (HT), 20 with hypertension and type 2 diabetes mellitus (DM), and 41 had no accompanying condition. The following parameters were measured in the serum of the examinees: products of lipid peroxidation malondialdehyde (MDA) and lipofuscin-like fluorophores (LLF), activity of prooxidative enzymes xanthine oxidase (XO) and myeloperoxidase (MPO), antioxidant enzymes superoxide dismutase (SOD) and glutathione peroxidase (GPx), the concentration of thiol groups, and the ferric reducing activity of plasma. The activity of prooxidative...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Age-related cataract; Hypertension; Xanthine oxidase; Myeloperoxidase.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2018000500611