ABSTRACT
Pseudomonas mendocina P2d grew in sodium benzoate at as high as 1% concentration and formed a quinonoid compound, identified as ortho-benzoquinone, that rendered the medium orange to wine-red in colour. The quinone was not metabilised further by the organism. Sodium benzoate was converted to catechol, which was a central metabolite forming ortho-benzoquinone and 2- hydroxymuconic semialdehyde (2-HMS) via. meta ring cleavage pathway.
Subject(s)
Aldehydes/metabolism , Benzoquinones/metabolism , Catechols/metabolism , Chromatography, High Pressure Liquid , Chromatography, Thin Layer , Models, Chemical , Pseudomonas mendocina/metabolism , Sodium Benzoate/metabolism , Time FactorsABSTRACT
Glutamate or deoxyuridine in the presence of Cu2+ and delta-aminolevulinic acid (ALA) reaction resulted in the formation of thiobarbituric acid reactive compounds (TBAR), which was linear up to 2 hr. TBAR increased linearly with the increase of both ALA and copper ion concentration. Oxygen consumption was directly proportional to the concentration of formaldehyde perhaps formed by secondary oxidation of dimethyl sulfoxide. Addition of oxyradical scavengers in the reaction mixture resulted in the inhibition of TBAR formation.
Subject(s)
Aldehydes/metabolism , Aminolevulinic Acid/pharmacology , Copper/pharmacology , Deoxyuridine/metabolism , Glutamic Acid/metabolismABSTRACT
A reacao entre semicarbazina e 2-tiofenocarboxaldeido, 2-pirrolcarboxaldeido e N-metil-2-pirrolcarboxaldeido, dando origem a semicarbazonas, em solucao aquosa, a 25,0 graus centigrados e com forca ionica 0,50, ocorre em duas etapas: formacao de uma carbinolamina intermediaria (etapa lenta em valores de pH inferiores a 5) e desidratacao da carbinolamida (etapa lenta em valores de pH superiores a 5). A formacao da carbinolamina e susceptivel a catalise acida geral, efetuada pelo ion hidronio e pelos carboxilicos, enquanto que a desidratacao da carbinolamina e catalisada somente pelo ion hidronio