Caparica, Portugal

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    ABSTRACT: The proper disposal of the several types of wastes produced in industrial activities increases production costs. As a consequence, it is common to develop strategies to reuse these wastes in the same process and in different processes or to transform them for use in other processes. This work combines the needs for new synthesis methods of nanomaterials and the reduction of production cost using wastes from citrine juice (orange, lime, lemon and mandarin) to produce a new added value product, green zero-valent iron nanoparticles that can be used in several applications, including environmental remediation. The results indicate that extracts of the tested fruit wastes (peel, albedo and pulp fractions) can be used to produce zero-valent iron nanoparticles (nZVIs). This shows that these wastes can be an added value product. The resulting nZVIs had sizes ranging from 3 up to 300nm and distinct reactivities (pulp>peel>albedo extracts). All the studied nanoparticles did not present a significant agglomeration/settling tendency when compared to similar nanoparticles, which indicates that they remain in suspension and retain their reactivity.
    Science of The Total Environment 10/2014; 496:233–240. DOI:10.1016/j.scitotenv.2014.07.058
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    ABSTRACT: 1′,2,3,3′,4,4′,6-Hepta-O-benzyl-6′-N-methacryloyl-6′-deoxysucrose 1, 6′-deoxy-6′-N-methacryloyloxyethylureido sucrose 2 and 6,6′-dideoxy-6,6′-N-dimethacryloyloxyethylureido sucrose 3 have been homo-polymerized and copolymerized with styrene by a free radical process, yielding polymer materials with pendant sucrose moieties, attached to the polymer backbone via amide linkages. The results demonstrated that varying the structural features of the monomers, greatly affected the thermal and rheological properties of the polymers. The polymer materials obtained have been characterized by NMR, MALDI-TOF, DSC, AFM and EWC (equilibrium water content). The efficient synthesis of the three novel, regioisomerically pure, N-methacryloylamide sucrose-containing monomers (1, 2 and 3) have been described.
    Carbohydrate Polymers 09/2014; 110:38–46. DOI:10.1016/j.carbpol.2014.03.050
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    ABSTRACT: Total antioxidant capacity assays are recognized as instrumental to establish antioxidant status of biological samples, however the varying experimental conditions result in conclusions that may not be transposable to other settings. After selection of the complexing agent, reagent addition order, buffer type and concentration, copper reducing assays were adapted to a high-throughput scheme and validated using model biological antioxidant compounds of ascorbic acid, Trolox (a soluble analogue of vitamin E), uric acid and glutathione. A critical comparison was made based on real samples including NIST-909c human serum certified sample, and five study samples. The validated method provided linear range up to 100 µM Trolox, (limit of detection 2.3 µM; limit of quantification 7.7 µM) with recovery results above 85% and precision <5%. The validated developed method with an increased sensitivity is a sound choice for assessment of TAC in serum samples.
    International Journal of Molecular Sciences 07/2014; 15(7):11387-11402. DOI:10.3390/ijms150711387


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    Caparica, Portugal
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Top publications last week by reads

Journal of Proteomics 03/2015; DOI:10.1016/j.jprot.2015.02.017
9 Reads
The Analyst 08/2014; 139(19). DOI:10.1039/c4an00810c
8 Reads

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