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3 results on '"Adolfo, Marcelo"'

1. An improved microbial synthesis of purine nucleosides

Author

Lewkowicz, Elizabeth Sandra, Martínez, Natalia, Rogert, María C., Porro, Silvia, and Iribarren, Adolfo Marcelo

Subjects
PURINE NUCLEOSIDES, BIOTRANSFORMATIONS, Otras Ciencias Químicas, Ciencias Químicas, NUCLEOSIDE PHOSPHORYLASES, ESCHERICHIA COLI, CIENCIAS NATURALES Y EXACTAS
Abstract

E. coli BL21 synthesized purine nucleosides from pyrimidine ones. A 94% yield of adenosine from uridine was reached within 1 h. Fil: Lewkowicz, Elizabeth Sandra. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Quilmes; Argentina Fil: Martínez, Natalia. Universidad Nacional de Quilmes; Argentina Fil: Rogert, María C.. Universidad Nacional de Quilmes; Argentina Fil: Porro, Silvia. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Quilmes; Argentina Fil: Iribarren, Adolfo Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones en Ingeniería Genética y Biología Molecular "Dr. Héctor N. Torres"; Argentina

Published
2000
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2. Complete and regioselective deacetylation of peracetylated uridines using a lipase

Author

Iglesias, Luis Emilio, Zinni, Maria Alejandra, Gallo, Mariana, and Iribarren, Adolfo Marcelo

Subjects
NUCLEOSIDES, DEACETYLATION, Otras Ciencias Químicas, Ciencias Químicas, LIPASE, TRIACETYLURIDINES, CIENCIAS NATURALES Y EXACTAS, ACETYLURIDINES
Abstract

Lipase-catalysed alcoholysis and hydrolysis of 2',3',5-tri-O- acetyluridine (1a) and 2',3',5'-tri-O-acetyl-2'-C-methyluridine (1b) were studied. Conditions for full and regioselective deacetylation of 1a and 1b are shown in the present work. New compound 2',3'-di-O-acetyl-2'-C- methyluridine (3b) was prepared by regioselective lipase-catalysed deacetylation. Fil: Iglesias, Luis Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Quilmes; Argentina Fil: Zinni, Maria Alejandra. Universidad Nacional de Quilmes; Argentina Fil: Gallo, Mariana. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones en Ingeniería Genética y Biología Molecular "Dr. Héctor N. Torres"; Argentina Fil: Iribarren, Adolfo Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Quilmes; Argentina

Published
2000
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3. Novel fungal organophosphorus hydrolases in acidic media: an application to apples decontamination.

Author

Santillan JY, Rojas NL, Lewkowicz ES, and Iribarren AM

Subjects
Aryldialkylphosphatase, Organophosphorus Compounds chemistry, Decontamination, Hydrolases chemistry, Pesticides chemistry, Malus metabolism
Abstract

Organophosphorus pesticides bring significant improvements in agriculture, but their toxicity causes environmental and health negative impacts. The aim of this work was the development of robust biocatalysts to be applied in bioremediation. Four fungi were evaluated as hydrolase sources capable of degrading organophosphorus pesticides: Aspergillus niger, Fusarium sp., Penicillium chrysogenum, and Penicillium nalgiovense. The hydrolysis rates of methyl paraoxon obtained under acidic conditions were in the range of 10 to 21 mg L -1 d -1 , which is remarkable since most similar biocatalysts are active under alkaline conditions. Penicillium chrysogenum activity was outstanding, and it was selected to prepare, characterize, and study the applications of its enzymatic extract. It was used to evaluate the bioremediation of apple surfaces at pH 2 in the presence of SDS, achieving complete methyl paraoxon degradation under proposed conditions. These results indicate that this biocatalyst could complement industrialized fruit washing processes for the elimination of organophosphorus pesticides., (© 2022. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)

Published
2023
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