Determinação de deoxinivalenol e zearalenona em arroz natural e parboilizado e suas frações utilizando quEChERS e HPLC/UV-FL

The QuEChERS extraction method followed by quantification using HPLC/UV-FL was evaluated for deoxynivalenol (DON) and zearalenone (ZEA) determination in natural and parboiled rice and their fractions (bran and husk). The comparison between QuEChERS and partition with acetonitrile extraction showed that the first one was better. It presented higher recovery (91% for DON, 105% for ZEA) wih precision ranging from 1.5 to 18.6%. The limits of quantification were 22.2 µg kg-1 for DON and 4.3 µg kg-1 for ZEA. DON and ZEA showed higher levels in endosperm of parboiled rice (8 e 111.7 µg kg-1, respectively) when compared to natural rice.

Franz Brentano: equivocidad del ser y objeto intencional

Este trabajo se propone probar que el concepto brentaniano de intencionalidad, más propiamente, su teoría de la inmanencia del objeto intencional y el posterior abandono de la misma, no pueden ser comprendidos de modo adecuado sino en el marco de las preocupaciones ontológicas del autor y, en particular, de su defensa inicial y subsiguiente rechazo de la tesis de la equivocidad del ser.