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The purpose of this work was to evaluate γ‐irradiation effects on native microbiota, some phytochemicals and sensory attributes of fresh spinach (Spinacia oleracea L.) throughout 15 days of storage (6 °C ± 1 °C). The proposed treatment (1.5 kGy) effectively reduced native microbiota extending shelf life under refrigeration to 14 days, and the evaluated phytochemicals (polyphenols, compounds with antioxidant capacity, chlorophyll, carotenoids) were preserved with the exception of ascorbic acid, which was reduced by more than 80% after treatment. Sensory acceptability, evaluated by a consumer panel, of samples irradiated either at 1.5 or 3.0 kGy was good till the last analysis date (day 14). The target dose had a great performance, presenting scores in some attributes significantly higher than those of control samples (overall liking and appearance on day 2). Overall, the performance of gamma rays was acceptable and significantly increased product acceptability; therefore, it represents a feasible alternative for spinach disinfection. Practical applications Gamma irradiation has attracted attention as a potential nonthermal decontamination strategy to ensure the safety of fresh fruits and vegetables. Several studies have demonstrated the high efficiency of this technology applied on different vegetables to control typical pathogens, but vegetables tolerance to radiation can vary, so process validation is required in each case. Hopefully the results presented herein could encourage large‐scale adoption of this technology by the fresh produce industry.

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[234] departamento de filosofía • facultad de ciencias humanas • universidad nacional de colombia juan ignacio garrido RESUMENSe muestra cómo K. Marx establece en el marxismo y en la filosofía política en general una ambivalencia constitutiva entre la crítica y la imaginación política, pues desarrolla un realismo político que derrumba los artificios del idealismo al denunciar los intereses dominantes que lo sostienen, y que constituye una nueva figura del presente. En El Capital y en los Grundrisse lleva a cabo un desmontaje de las apariencias del mundo de las mercancías, y al mismo tiempo indica cómo los montajes colectivos constituyen la manera en que la realidad y la praxis proletaria no pueden dejar de aparecer.Palabras clave: K. Marx, idealismo, mercancía, proletariado. ABSTRACTThe article shows how K. Marx stablishes a constitutive ambivalence between critique and political imagination in Marxism and in political philosophy in general, for he develops a political realism which overthrows idealism's artifices as he denounces the dominant interests which support it. In this way, he reveals a new figure from the present. In Capital and the Grundrisse, he carries out a disassembly of the world of merchandises' appearances and at the same time, he points out how the collective assemblies constitute the way in which reality and proletarian praxis can not stop appearing. This constitutes a big problem which is waiting to be resolved by political theory an practice.