Person:
Ramos Ruiz, Amparo

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First Name
Amparo
Last Name
Ramos Ruiz
URI
https://hdl.handle.net/20.500.14352/82271
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Geológicas
Department
Area
Estratigrafía
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20202
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End date: 2020 × Start date: 2010 ×

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Now showing 1 - 2 of 2
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    Study of the influence of the precursors on the sensing properties of ZnO:Cu system
    (Ceramics international, 2020) Ramos Ruiz, Amparo; Urbieta Quiroga, Ana Irene; Escalante, G.; Hidalgo Alcalde, Pedro; Espinós, J.P.; Fernández Sánchez, Paloma
    The properties of ZnO based materials for ethanol detection have been studied. Cu doped samples obtained from different precursors have been investigated. ZnO and ZnS have been used as host and Cu and CuO as dopant sources. The sensing measurements have been mostly performed at room temperature. To monitor the effect of the presence of gas, resistivity and photoluminescence experiments with and without sensing gas have been carried out. The sensing behaviour is affected by the nature of the precursors used. For ZnO:Cu and ZnO:CuO series, a higher sensitivity is obtained at the lower gas concentrations, the better response is obtained for the sample ZnO:Cu with wt.1% of metallic copper. Strong segregation effects observed in these samples could be deleterious for the sensing properties. In the series ZnS:CuO, no segregation is observed, however the sensing behaviour is erratic and attributed to the reduction of Cu ions to the metallic state.
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    Deoxynivalenol degradation in wheat kernels by exposition to ammonia vapours: a tentative strategy for detoxification
    (Food Control, 2020) Borràs-Vallverdú, Bernat; Ramos Ruiz, Amparo; Marín, Sonia; Sanchis, Vicente; Rodríguez Bencomo, Juan José
    Deoxynivalenol (DON) is a mycotoxin produced mainly by Fusarium species and occurs predominantly in cereal grains such as wheat. Due to its toxic effects, in the European Union DON content in unprocessed cereals and processed cereal-based products for human consumption has been regulated, and recommended maximum limits have been established for animal feed. In this study, a method for degrading DON on wheat kernels, by exposition to ammonia (NH3) vapours, was optimized. Results have shown that with a simple treatment with ammonia vapours at 90 °C (for 2 h), degradations higher than 75% were achieved in kernels affected by a moderated contamination up to 2000 μg/kg DON. The study of the reaction between DON and NH3 allowed us to tentatively establish the structure of possible degradation products. In addition, in silico evaluation indicated, in general, lower toxicity and biological effects for the degradation products than for DON.