The bound volatile fraction of cape gooseberry (Physalis peruviana L.) fruit harvested in Colombia has been examined by HRGC and HRGC-MS after enzymatic hydrolysis using a nonselective pectinase (Rohapect D5L). Forty bound volatiles could be identified, with 21 of them being reported for the first time in cape gooseberry. After preparative isolation of the glycosidic precursors on XAD-2 resin, purification by multilayer coil countercurrent chromatography and HPLC of the peracetylated glycosides were carried out. Structure elucidation by NMR, ESI-MS/MS, and optical rotation enabled the identification of (1S,2S)-1-phenylpropane-1,2-diol 2-O-beta-D-glucopyranoside (1) and p-menth-4(8)-ene-1,2-diol 1-O-alpha-L-arabinopyranosyl-(1-6)-beta-D-glucopyranoside (2). Both glycosides have been identified for the first time in nature. They could be considered as immediate precursors of 1-phenylpropane-1,2-diol and p-menth-4(8)-ene-1,2-diol, typical volatiles found in the fruit of cape gooseberry.
El presente artículo corresponde al estudio a nivel de laboratorio en el cual se evaluó el comportamiento de dos filtros anaeróbicos como método de tratamiento de aguas residuales de origen industrial. En el trabajo se evaluaron dos medios soportes y la puesta en marcha se realizó mediante el incremento porcentual de carga orgánica. Cada incremento se hizo una vez se consiguieron en el sistema condiciones de estado estable. Los resultados obtenidos mostraron que la adherencia de los microorganismos al soporte es una variable importante, de la cual dependerá de la selección del medio soporte. Este trabajo es el resumen del Proyecto de Grado de los estudiantes Jairo Guevara y Humberto Mayorga.
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