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  1. Article ; Online: Zinc oxide nanostructures for fluorescence and Raman signal enhancement

    Ioana Marica / Fran Nekvapil / Maria Ștefan / Cosmin Farcău / Alexandra Falamaș

    Beilstein Journal of Nanotechnology, Vol 13, Iss 1, Pp 472-

    a review

    2022  Volume 490

    Abstract: Since the initial discovery of surface-enhanced Raman scattering (SERS) and surface-enhanced fluorescence (SEF), these techniques have shown huge potential for applications in biomedicine, biotechnology, and optical sensors. Both methods rely on the high ...

    Abstract Since the initial discovery of surface-enhanced Raman scattering (SERS) and surface-enhanced fluorescence (SEF), these techniques have shown huge potential for applications in biomedicine, biotechnology, and optical sensors. Both methods rely on the high electromagnetic fields created at locations on the surface of plasmonic metal nanoparticles, depending on the geometry of the nanoparticles, their surface features, and the specific location of analyte molecules. Lately, ZnO-based nanostructures have been exploited especially as SERS substrates showing high enhancement factors and increased charge transfer effect. Additionally, applications focused on enhancing the fluorescence of analyte molecules as well as on tuning the photoluminescence properties of ZnO nanostructures through combination with metal nanoparticles. This review covers the major recent results of ZnO-based nanostructures used for fluorescence and Raman signal enhancement. The broad range of ZnO and ZnO–metal nanostructures synthesis methods are discussed, highlighting low-cost methods and the recyclability of ZnO-based nanosubstrates. Also, the SERS signal enhancement by ZnO-based nanostructures and the influences of lattice defects on the SERS signal are described. The photoluminescence enhancement of ZnO in the presence of noble metal nanoparticles and the molecular fluorescence enhancement in the presence of ZnO alone and in combination with metal nanoparticles are also reviewed.
    Keywords fluorescence ; surface-enhanced raman spectroscopy ; zno–metal nanomaterials ; zno nanostructures ; Technology ; T ; Chemical technology ; TP1-1185 ; Science ; Q ; Physics ; QC1-999
    Subject code 500
    Language English
    Publishing date 2022-05-01T00:00:00Z
    Publisher Beilstein-Institut
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: A Novel Nanoporous Adsorbent for Pesticides Obtained from Biogenic Calcium Carbonate Derived from Waste Crab Shells

    Fran Nekvapil / Adina Stegarescu / Ildiko Lung / Razvan Hirian / Dragoș Cosma / Erika Levei / Maria-Loredana Soran

    Nanomaterials, Vol 13, Iss 23, p

    2023  Volume 3042

    Abstract: A novel nanoporous adsorbent was obtained through the thermal treatment and chemical wash of the wasted crab shells (BC1) and characterized by various techniques. The structure of BC1 at the end of the treatments comprised a mixture of calcite and ... ...

    Abstract A novel nanoporous adsorbent was obtained through the thermal treatment and chemical wash of the wasted crab shells (BC1) and characterized by various techniques. The structure of BC1 at the end of the treatments comprised a mixture of calcite and amorphous CaCO 3 , as evidenced by X-ray diffraction and Fourier transform infrared absorption. The BET surface area, BET pore volume, and pore diameter were 250.33 m 2 g −1 , 0.4 cm 3 g −1 , and <70 nm, respectively. The point of zero charge of BC1 was determined to be around pH 9. The prepared adsorbent was tested for its adsorption efficacy towards the neonicotinoid pesticide acetamiprid. The influence of pH (2–10), temperature (20–45 °C), adsorbent dose (0.2–1.2 g L −1 ), contact time (5–60 min), and initial pesticide concentration (10–60 mg L −1 ) on the adsorption process of acetamiprid on BC1 was studied. The adsorption capacity of BC1 was 17.8 mg g −1 under optimum conditions (i.e., 20 mg L −1 initial acetamiprid concentration, pH 8, 1 g L −1 adsorbent dose, 25 °C, and 15 min contact time). The equilibrium data obtained from the adsorption experiment fitted well with the Langmuir isotherm model. We developed an effective nanoporous adsorbent for the recycling of crab shells which can be applied on site with minimal laboratory infrastructure according to local needs.
    Keywords crab shell ; blue biotechnology ; porosity ; acetamiprid ; adsorption ; Chemistry ; QD1-999
    Subject code 333
    Language English
    Publishing date 2023-11-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: A New Biofertilizer Formulation with Enriched Nutrients Content from Wasted Algal Biomass Extracts Incorporated in Biogenic Powders

    Fran Nekvapil / Iolanda-Veronica Ganea / Alexandra Ciorîță / Razvan Hirian / Sanja Tomšić / Ildiko Melinda Martonos / Simona Cintă Pinzaru

    Sustainability, Vol 13, Iss 8777, p

    2021  Volume 8777

    Abstract: Raw algae waste naturally thrown on shores could pose serious threats for landfilling and its reuse for composting or further processing as added-value by-products require knowledge-based decisions and management for the sustainable development of local ... ...

    Abstract Raw algae waste naturally thrown on shores could pose serious threats for landfilling and its reuse for composting or further processing as added-value by-products require knowledge-based decisions and management for the sustainable development of local ecosystems. Raw marine waste containing salt (halite) and heavy metals that eventually accumulate in algae hamper their safe applicability in soil fertilization or in other exploitations. Here, the suitability of algal biomass for use as an environmentally safe fertilizer was investigated, thereby supporting sustainable coastal management. The simple extraction of the dry algal biomass of three abundant Mediterranean species, Enteromorpha intestinalis , Corallina elongata , and Gelidium pulchellum , in water containing sodium carbonate resulted in a greenish extract containing a reduced heavy metals content, and nutrients such as K + , PO 4 3− , SO 4 2− , NO 3 − , Ca 2+ , and Mg 2+ . UV-Vis and Raman techniques, including surface-enhanced Raman scattering (SERS), were employed for the fast evidencing of polyphenols, carotenoids, and chlorophylls in the extracts content, while E. intestinalis extract additionally exhibited polysaccharide signals. Heavy metals analysis showed that the major metals in the extracts were Fe, Ni, Zn, and Cu; however, their levels were an order of magnitude lower than in the dry biomass. The extracts also showed a mild antibacterial effect. The combination option of aqueous extracts with powdered crustacean shells to obtain a novel, eco-friendly, solid biofertilizer complex was further shown, which could be pelleted for convenient use. The immersion of solid biofertilizer pellets in water is accompanied by re-solubilization of the compounds originating from algae extracts, presenting the opportunity for dry storage and easier handling and land applicability. In summary, aqueous extracts of marine algae waste present an environmentally safe and attractive way to recycle excessive algal biomass and to formulate a new, eco-friendly biofertilizer complex.
    Keywords biofertilizer ; algal biomass ; aqueous extracts ; environmental legislation ; UV/Vis ; surface-enhanced Raman spectroscopy ; Environmental effects of industries and plants ; TD194-195 ; Renewable energy sources ; TJ807-830 ; Environmental sciences ; GE1-350
    Subject code 333
    Language English
    Publishing date 2021-08-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Novel Drug Carrier

    Geza Lazar / Fran Nekvapil / Razvan Hirian / Branko Glamuzina / Tudor Tamas / Lucian Barbu-Tudoran / Simona Cinta Pinzaru

    ACS Omega, Vol 6, Iss 42, Pp 27781-

    5‑Fluorouracil Formulation in Nanoporous Biogenic Mg-calcite from Blue Crab ShellsProof of Concept

    2021  Volume 27790

    Keywords Chemistry ; QD1-999
    Language English
    Publishing date 2021-10-01T00:00:00Z
    Publisher American Chemical Society
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Comparative screening the life-time composition and crystallinity variation in gilthead seabream otoliths Sparus aurata from different marine environments

    Geza Lazar / Fran Nekvapil / Sanja Matić-Skoko / Călin Firta / Dario Vrdoljak / Hana Uvanović / Lucian Barbu-Tudoran / Maria Suciu / Luka Glamuzina / Branko Glamuzina / Regina Mertz-Kraus / Simona Cinta Pinzaru

    Scientific Reports, Vol 12, Iss 1, Pp 1-

    2022  Volume 13

    Abstract: Abstract Differences in crystallinity, structure and composition variation along the growing direction in gilthead seabream, Sparus aurata otoliths that inhabited different environments were determined to evaluate the correlation of spectroscopic and ... ...

    Abstract Abstract Differences in crystallinity, structure and composition variation along the growing direction in gilthead seabream, Sparus aurata otoliths that inhabited different environments were determined to evaluate the correlation of spectroscopic and chemical data with the lifetime development and movement pattern. The Raman spectroscopy signal provided the characteristic bands whose Full Width at Half Maximum (FWHM) were used to track the signal variability. The FWHM showed an initial increase in the core area, followed by a decrease depicting two minima coinciding growth rings. The crystal discontinuity linked to annual rings was confirmed. The FWHM pattern followed cycle in the individual’s activity. However, no significant correlation with FWHM and environmental factors although the slope of the FWHM variation distinguished aquaculture and costal groups from open sea and transitional, estuarine waters. Raman data were further correlated with morphological and elemental composition obtained via SEM–EDX and by LA-ICP-MS. SEM clearly confirmed CRM findings. Finally, multiparameter analysis of Ba/Ca concentrations obtained by LA-ICP-MS indicated the separation of groups associated with aquaculture and transitional waters due lowest variability in the elemental composition. Other groups are more variable possibly due to the water oligotrophic character and greater variability in prey availability in each environment. Results of the present study showed the additional potential of Raman spectroscopy as a complementary tool for inference of migration or origin of fish based on otolith composition and structure like other well-established technique.
    Keywords Medicine ; R ; Science ; Q
    Subject code 333
    Language English
    Publishing date 2022-06-01T00:00:00Z
    Publisher Nature Portfolio
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: The Influence of Zn Substitution on Physical Properties of CoFe 2 O 4 Nanoparticles

    Adam Szatmari / Rares Bortnic / Gabriela Souca / Razvan Hirian / Lucian Barbu-Tudoran / Fran Nekvapil / Cristian Iacovita / Emil Burzo / Roxana Dudric / Romulus Tetean

    Nanomaterials, Vol 13, Iss 1, p

    2022  Volume 189

    Abstract: Co 1− x Zn x Fe 2 O 4 nanoparticles (0 ≤ x ≤ 1) have been synthesized via a green sol–gel combustion method. The prepared samples were studied using X-ray diffraction measurements (XRD), transmission electron microscopy (TEM), Raman, and magnetic ... ...

    Abstract Co 1− x Zn x Fe 2 O 4 nanoparticles (0 ≤ x ≤ 1) have been synthesized via a green sol–gel combustion method. The prepared samples were studied using X-ray diffraction measurements (XRD), transmission electron microscopy (TEM), Raman, and magnetic measurements. All samples were found to be single phases and have a cubic Fd-3m structure. EDS analysis confirmed the presence of cobalt, zinc, iron, and oxygen in all studied samples. Raman spectra clearly show that Zn ions are preferentially located in T sites for low Zn concentrations. Due to their high crystallinity, the nanoparticles show high values of the magnetization, which increases with the Zn content for x < 0.5. The magnetic properties are discussed based on Raman results. Co ferrite doped with 30% of Zn produced the largest SAR values, which increase linearly from 148 to 840 W/g MNPs as the H is increased from 20 to 60 kA/m.
    Keywords zinc–cobalt ferrite nanoparticles ; Raman measurements ; magnetic properties ; Chemistry ; QD1-999
    Subject code 290 ; 620
    Language English
    Publishing date 2022-12-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article ; Online: Rapid and Application-Tailored Assessment Tool for Biogenic Powders from Crustacean Shell Waste

    Lovro Ogresta / Fran Nekvapil / Tudor Tǎmaş / Lucian Barbu-Tudoran / Maria Suciu / Rǎzvan Hirian / Mihaela Aluaş / Geza Lazar / Erika Levei / Branko Glamuzina / Simona Cintǎ Pinzaru

    ACS Omega, Vol 6, Iss 42, Pp 27773-

    Fourier Transform-Infrared Spectroscopy Complemented with X‑ray Diffraction, Scanning Electron Microscopy, and Nuclear Magnetic Resonance Spectroscopy

    2021  Volume 27780

    Keywords Chemistry ; QD1-999
    Language English
    Publishing date 2021-10-01T00:00:00Z
    Publisher American Chemical Society
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article ; Online: Biocompatible Magnetic Colloidal Suspension Used as a Tool for Localized Hyperthermia in Human Breast Adenocarcinoma Cells

    Elena-Alina Moacă / Claudia-Geanina Watz / Vlad Socoliuc / Roxana Racoviceanu / Cornelia Păcurariu / Robert Ianoş / Simona Cîntă-Pînzaru / Lucian Barbu Tudoran / Fran Nekvapil / Stela Iurciuc / Codruța Șoica / Cristina-Adriana Dehelean

    Nanomaterials, Vol 11, Iss 1189, p

    Physicochemical Analysis and Complex In Vitro Biological Profile

    2021  Volume 1189

    Abstract: Magnetic iron oxide nanoparticles are the most desired nanomaterials for biomedical applications due to their unique physiochemical properties. A facile single-step process for the preparation of a highly stable and biocompatible magnetic colloidal ... ...

    Abstract Magnetic iron oxide nanoparticles are the most desired nanomaterials for biomedical applications due to their unique physiochemical properties. A facile single-step process for the preparation of a highly stable and biocompatible magnetic colloidal suspension based on citric-acid-coated magnetic iron oxide nanoparticles used as an effective heating source for the hyperthermia treatment of cancer cells is presented. The physicochemical analysis revealed that the magnetic colloidal suspension had a z-average diameter of 72.7 nm at 25 °C with a polydispersity index of 0.179 and a zeta potential of −45.0 mV, superparamagnetic features, and a heating capacity that was quantified by an intrinsic loss power analysis. Raman spectroscopy showed the presence of magnetite and confirmed the presence of citric acid on the surfaces of the magnetic iron oxide nanoparticles. The biological results showed that breast adenocarcinoma cells (MDA-MB-231) were significantly affected after exposure to the magnetic colloidal suspension with a concentration of 30 µg/mL 24 h post-treatment under hyperthermic conditions, while the nontumorigenic (MCF-10A) cells exhibited a viability above 90% under the same thermal setup. Thus, the biological data obtained in the present study clearly endorse the need for further investigations to establish the clinical biological potential of synthesized magnetic colloidal suspension for magnetically triggered hyperthermia.
    Keywords magnetic iron oxides nanoparticles ; citric acid ; Raman spectroscopy ; combustion method ; breast adenocarcinoma ; Chemistry ; QD1-999
    Subject code 620
    Language English
    Publishing date 2021-04-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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