5 research outputs found

    Ziziphus lotus (L.) Lam. plant treatment by ultrasounds and microwaves to improve antioxidants yield and quality: An overview

    Get PDF
    The purpose of this review is to compile the literature published about different aspects of microwave-assisted extraction (MAE) use and ultrasound-assisted extraction (UAE) applied on jujube worldwide and to compare the results on the antioxidant activity obtained for each extraction method. As a result of the increased consumers demand for natural products, as well as for those of agro-food, nutraceutical, cosmetic industries, and green extraction techniques are nowadays trending to be potential alternatives that can improve antioxidant yield and its quality from an economical and environmental point of view by reducing time, energy, and solvent consumption. Ultrasounds and microwaves are widely used methods in the extraction of active principles due to their cavitation and dipolar rotation effect, respectively. These two techniques provide efficiency of extraction while minimizing the time and preserving the quality of the food matrix, overcoming the disadvantages of conventional techniques characterized by their consumption of large quantities of solvents and providing a sparse quantity of extraction. Jujube, a shrub with a high antioxidant potential, which can be affected by various extraction conditions can be the target of UAE and MAE to increase the antioxidant extraction yield. Exploiting the beneficial properties such as the antioxidant activity can lead to an industrialization process, replacing therefor synthetic antioxidants with natural compounds. These can also help in the development of new nutraceuticals and can be used, for instance, in agro-food industries as preservatives

    Kinetics and Thermodynamic Studies for Removal of Trypan Blue and Methylene Blue from Water Using Nano Clay Filled Composite of HTAB and PEG and its Antibacterial Activity

    Get PDF
    This work describes the preparation of new eco-friendly adsorbents with a simple method. At first, Montmorillonite (MMT) was modified with surfactant HTAB (MMT@HTAB) and then with polymer PEG (MMT@HTAB@PEG). The as-synthesized materials were characterized by several characterization techniques, including XRD, FTIR, SEM, TEM, TGA, N2 adsorption/desorption isotherm analysis by the BET method and zeta potential measurement then evaluated as adsorbents for removal of both methylene blue (MB) as a cationic dye and trypan blue (TB) as the anionic dye from aqueous solution under different contact time, dye concentration, temperature, and pH. The obtained results confirm the intercalation of surfactant within the clay layers, while the obtained nanocomposite showed different morphologies and structures in which the exfoliated and intercalated forms were obtained. The maximum adsorption capacity of TB and MB was found to be 190.81 and 237.22 mg/g, respectively, with MMT@HTAB@PEG adsorbent in an initial concentration of 100 mg/L at alkaline pH in 35 min and a temperature of 25 °C. The adsorption kinetics of TB and MB on MMT@HTAB@PEG was best fitted by the pseudo-second order model, and the isotherms results reveals better consistency of the Langmuir model, indicating that the adsorption is favorable and in the form of multilayers. The thermodynamic study showed that the adsorption processes of TB and MB by the both MMT@HTAB and MMT@HTAB@PEG adsorbents occur in an autonomous way and the temperature has not a significant effect on the adsorption capacity of TB and MB dyes. In addition, MMT@HTAB showed good antibacterial activity against both Escherichia coli (ATCC 8739) and Micrococcus luteus (ATCC 9341) bacteria compared to MMT@HTAB@PEG. The broadcast area was found to be 6 and 5 mm in Escherichia coli (ATCC 8739) and Micrococcus luteus (ATCC 9341), respectively

    Reducing the environmental impact of surgery on a global scale: systematic review and co-prioritization with healthcare workers in 132 countries

    Get PDF
    Abstract Background Healthcare cannot achieve net-zero carbon without addressing operating theatres. The aim of this study was to prioritize feasible interventions to reduce the environmental impact of operating theatres. Methods This study adopted a four-phase Delphi consensus co-prioritization methodology. In phase 1, a systematic review of published interventions and global consultation of perioperative healthcare professionals were used to longlist interventions. In phase 2, iterative thematic analysis consolidated comparable interventions into a shortlist. In phase 3, the shortlist was co-prioritized based on patient and clinician views on acceptability, feasibility, and safety. In phase 4, ranked lists of interventions were presented by their relevance to high-income countries and low–middle-income countries. Results In phase 1, 43 interventions were identified, which had low uptake in practice according to 3042 professionals globally. In phase 2, a shortlist of 15 intervention domains was generated. In phase 3, interventions were deemed acceptable for more than 90 per cent of patients except for reducing general anaesthesia (84 per cent) and re-sterilization of ‘single-use’ consumables (86 per cent). In phase 4, the top three shortlisted interventions for high-income countries were: introducing recycling; reducing use of anaesthetic gases; and appropriate clinical waste processing. In phase 4, the top three shortlisted interventions for low–middle-income countries were: introducing reusable surgical devices; reducing use of consumables; and reducing the use of general anaesthesia. Conclusion This is a step toward environmentally sustainable operating environments with actionable interventions applicable to both high– and low–middle–income countries

    Dossier: Le Maghreb avec ou sans l'Europe ?

    No full text
    L’importance des relations euro-maghrĂ©bines justifie que L’AnnĂ©e du Maghreb, qui leur a dĂ©jĂ  consacrĂ© plusieurs dossiers dans le passĂ©, s’y intĂ©resse Ă  nouveau, dans le contexte changeant et incertain des rĂ©volutions arabes. Les diffĂ©rents projets euro-maghrĂ©bins, les accords d’association avec l’Union europĂ©enne et les multiples accords bilatĂ©raux de coopĂ©ration entre chacun des pays du Maghreb et chacun des pays europĂ©ens constituent la trame d’un tissu de relations denses, prenant incontestablement l’allure d’un partenariat privilĂ©giĂ©. Si ces nouvelles relations ont remplacĂ© les anciens liens de domination coloniale, on peut nĂ©anmoins s’interroger sur la nature et les effets de ce partenariat non seulement sur chacun des pays maghrĂ©bins mais aussi et surtout sur le Maghreb comme ensemble rĂ©gional encore Ă  construire. La proximitĂ© avec l’Europe et les relations privilĂ©giĂ©es entretenues ne compromettentelles pas l’intĂ©gration rĂ©gionale du Maghreb et une meilleure insertion dans les Ă©changes Ă©conomiques internationaux ? La rĂ©flexion actuelle qui traverse l’espace public sur le degrĂ© de dĂ©pendance du Maghreb vis-Ă -vis de l’Europe et sur la possibilitĂ© de dĂ©velopper des relations ou des partenariats avec d’autres pays ou rĂ©gions du monde mĂ©ritait d’ĂȘtre interrogĂ©e. Tout d’abord, pour tenter de dresser un panorama, dans un certain nombre de domaines, des relations euromaghrĂ©bines, mais aussi pour Ă©tablir un bilan prospectif des diffĂ©rents aspects des relations du Maghreb en dehors de l’Europe, qu’il s’agisse des principales puissances Ă©conomiques ou des pays Ă©mergents, mais aussi des relations infra et supra-nationales. Le Maghreb et le partenariat euro-mĂ©diterranĂ©en ont-ils encore leur place dans un monde globalisĂ© ? Et si oui, laquelle
    corecore