ASSESSING ZINC LEVELS: IS IT THE HOUR OF NEED?

Zinc is an essential mineral playing a pivotal role in numerous aspects of cellular metabolism. Zinc deficiency affects all age groups, but the effect on growing children is very severe. Zinc deficiency is known to cause stunted growth and development in children. However, there are no reliable biomarkers of zinc status to assess health risk. Without a specific, sensitive biomarker to determine the zinc nutritional status, zinc intervention program is a struggle. Sensitive and specific analysis of zinc status is hence cardinal to defining optimal zinc status and setting evidence-based reference intake level. Given the lack of an accurate, sensitive zinc biomarker that reflects zinc nutrition across various populations and situations, research is needed to identify new biomarkers. Presently, the biochemical marker for measuring the zinc status is analyzing the plasma zinc. However, zinc homeostasis depends on many factors complicating the detection of marginal zinc deficiency. Key words: Zinc; homeostasis; markers; under nutrition; deficienc

Protein-based structures for food applications: from macro to nanoscale

Novel food structures' development through handling of macroscopic and microscopic properties of bio-based materials (e.g., size, shape, and texture) is receiving a lot of attention since it allows controlling or changing structures' functionality. Proteins are among the most abundant and employed biomaterials in food technology. They are excellent candidates for creating novel food structures due to their nutritional value, biodegradability, biocompatibility, generally recognized as safe (GRAS) status and molecular characteristics. Additionally, the exploitation of proteins' gelation and aggregation properties can be used to encapsulate bioactive compounds inside their network and produce consistent delivery systems at macro-, micro-, and nanoscale. Consequently, bioactive compounds which are exposed to harsh storage and processing conditions and digestion environment may be protected and their bioavailability could be enhanced. In this review, a range of functional and structural properties of proteins which can be explored to develop macro-, micro-, and nanostructures with numerous promising food applications was discussed. Also, this review points out the relevance of scale on these structures' properties, allowing appropriate tailoring of protein-based systems such as hydrogels and micro- or nanocapsules to be used as bioactive compounds delivery systems. Finally, the behavior of these systems in the gastrointestinal tract (GIT) and the impact on bioactive compound bioavailability are thoroughly discussed.JM and AP acknowledge the Portuguese Foundation for Science and Technology (FCT) for their fellowships (SFRH/BPD/89992/2012 and SFRH/BPD/101181/2014). This work was supported by Portuguese FCT under the scope of the Project PTDC/AGR-TEC/5215/2014, of the strategic funding of UID/BIO/04469 unit and COMPETE 2020 (POCI-01-0145-FEDER-006684), and BioTecNorte operation (NORTE-01-0145-FEDER-000004) funded by the European Regional Development Fund under the scope of Norte2020—Programa Operacional Regional do Norte.info:eu-repo/semantics/publishedVersio

Design of bio-nanosystems for oral delivery of functional compounds

Nanotechnology has been referred to as one of the most interesting topics in food technology due to the potentialities of its use by food industry. This calls for studying the behavior of nanosystems as carriers of biological and functional compounds aiming at their utilization for delivery, controlled release and protection of such compounds during food processing and oral ingestion. This review highlights the principles of design and production of bio-nanosystems for oral delivery and their behavior within the human gastrointestinal (GI) tract, while providing an insight into the application of reverse engineering approach to the design of those bio-nanosystems. Nanocapsules, nanohydrogels, lipid-based and multilayer nanosystems are discussed (in terms of their main ingredients, production techniques, predominant forces and properties) and some examples of possible food applications are given. Phenomena occurring in in vitro digestion models are presented, mainly using examples related to the utilization of lipid-based nanosystems and their physicochemical behavior throughout the GI tract. Furthermore, it is shown how a reverse engineering approach, through two main steps, can be used to design bio-nanosystems for food applications, and finally a last section is presented to discuss future trends and consumer perception on food nanotechnology.Miguel A. Cerqueira, Ana C. Pinheiro, Helder D. Silva, Philippe E. Ramos, Ana I. Bourbon, Oscar L. Ramos (SFRH/BPD/72753/2010, SFRH/BD/48120/2008, SFRH/BD/81288/2011, SFRH/BD/80800/2011, SFRH/BD/73178/2010 and SFRH/BPD/80766/2011, respectively) are the recipients of a fellowship from the Fundacao para a Ciencia e Tecnologia (FCT, POPH-QREN and FSE Portugal). Maria L. Flores-Lopez thanks Mexican Science and Technology Council (CONACYT, Mexico) for PhD fellowship support (CONACYT Grant number: 215499/310847). The support of EU Cost Actions FA0904 and FA1001 is gratefully acknowledged

Edible bio-based nanostructures: delivery, absorption and potential toxicity

The development of bio-based nanostructures as nanocarriers of bioactive compounds to specific body sites has been presented as a hot topic in food, pharmaceutical and nanotechnology fields. Food and pharmaceutical industries seek to explore the huge potential of these nanostructures, once they can be entirely composed of biocompatible and non-toxic materials. At the same time, they allow the incorporation of lipophilic and hydrophilic bioactive compounds protecting them against degradation, maintaining its active and functional performance. Nevertheless, the physicochemical properties of such structures (e.g., size and charge) could change significantly their behavior in the gastrointestinal (GI) tract. The main challenges in the development of these nanostructures are the proper characterization and understanding of the processes occurring at their surface, when in contact with living systems. This is crucial to understand their delivery and absorption behavior as well as to recognize potential toxicological effects. This review will provide an insight into the recent innovations and challenges in the field of delivery via GI tract using bio-based nanostructures. Also, an overview of the approaches followed to ensure an effective deliver (e.g., avoiding physiological barriers) and to enhance stability and absorptive intestinal uptake of bioactive compounds will be provided. Information about nanostructures potential toxicity and a concise description of the in vitro and in vivo toxicity studies will also be given.Joana T. Martins, Oscar L. Ramos, Ana C. Pinheiro, Ana I. Bourbon, Helder D. Silva and Miguel A. Cerqueira (SFRH/BPD/89992/2012, SFRH/BPD/80766/2011, SFRH/BPD/101181/2014, SFRH/BD/73178/2010, SFRH/BD/81288/2011, and SFRH/BPD/72753/2010, respectively) are the recipients of a fellowship from the Fundacao para a Ciencia e Tecnologia (FCT, POPH-QREN and FSE, Portugal). The authors thank the FCT Strategic Project PEst-OE/EQB/LA0023/2013 and the project "BioInd-Biotechnology and Bioengineering for improved Industrial and Agro-Food processes," REF.NORTE-07-0124-FEDER-000028, co-funded by the Programa Operacional Regional do Norte (ON.2-O Novo Norte), QREN, FEDER. We also thank to the European Commission: BIOCAPS (316265, FP7/REGPOT-2012-2013.1) and Xunta de Galicia: Agrupamento INBIOMED (2012/273) and Grupo con potencial de crecimiento. The support of EU Cost Action FA1001 is gratefully acknowledged

Eco-friendly Ag-CuO nanoparticles for antidiabetic, antimicrobial, anti-cancer, platelet aggregation inducing, antioxidant and photocatalytic applications

The development of nanotechnology has a major impact on pharmaceutical sciences, dramatically improving diagnosis and treatment of many diseases that are life-threatening. A number of metallic nanoparticles are widely employed as nanomedicines because they may have medicinal applications. The environmental pollution from textile industry is one the big global problems that pose substantial risks to the environment and public health. Finding affordable, efficient, and sustainable technology to solve the challenges with pollution is crucial. In the present study we developed multi-functional Ag-doped CuO nanoparticles by utilizing Actinidia delicia extract by employing solution combustion method. The synthesized nanoparticles were examined by Transmission electron microscopy, scanning electron microscopy including energy dispersion X-ray analysis (EDX), X-ray diffraction (XRD), Fourier transform infrared spectroscopy, and UV–visible spectroscopy. The synthesized nanoparticles have a variety of applications including anticancer, antibacterial, and antidiabetic agents via modulating the activities of carbohydrate digesting enzymes, and they also exhibit effective photocatalytic activity by degrading the methylene blue dye. Platelet aggregation and plasma coagulation were both enhanced by Ag-doped copper oxide nanoparticles, and this was achieved without any noticeable haemolytic activity. This study presents an eco-friendly method for producing multifunctional Ag-CuO nanoparticles

Health and environmental effects of silent killers Organochlorine pesticides and polychlorinated biphenyl

Persistent organic pollutants (POPs) are known to be silent killers due to their bioaccumulative and long-lasting existence. These pollutants are present everywhere in our environment, including plants, animals, and humans. POPs can be stored in several aquatic environmental matrices and biomagnified by the food web, thus presenting a danger to aquatic habitats and human health. During recent decades, they have gained substantial attention considering their possible persistent threats. In the aquatic environment, legacy POPs, such as organochlorine pesticides (OCPs), polychlorinated biphenyls (PCBs), were widely found and recorded. A complete description of OCPs and PCBs amounts and their distribution in the aquatic environment is necessary for a detailed understanding of the activities and threats of POPs in aquatic ecosystems