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Zannini M, Cattivelli A, Nissen L, Conte A, Gianotti A, Tagliazucchi D. Identification, Bioaccessibility, and Antioxidant Properties of Phenolic Compounds in Carob Syrup. Foods 2024; 13:2196. [PMID: 39063280 PMCID: PMC11276241 DOI: 10.3390/foods13142196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2024] [Revised: 07/05/2024] [Accepted: 07/10/2024] [Indexed: 07/28/2024] Open
Abstract
Carob syrup is a brown, thick syrup produced from carob pulp that can be directly consumed or used as a sweetener, which also finds applications in folk medicinal practices. In this work, the quali-quantitative phenolic profile of five different carob syrups was elucidated before and after in vitro gastro-intestinal digestion. Moreover, the anti-oxidant properties of undigested and digested carob syrups were investigated. A total of 75 phenolic compounds were identified in undigested carob syrups. The most important phenolic compound in all the samples was gallic acid, the concentration of which ranged between 54.28 and 117.73 mg/100 g. Additional compounds belonging to the classes of hydroxybenzoic acids (in particular glycosylated gallic acid derivatives), hydroxycinnamic acids, and flavonoids (especially flavonols) were also identified. During in vitro gastric digestion, gallic acid mono- and di-hexosides were diglycosylated, releasing gallic acid, which was further degraded in ellagic acid through oxidative polymerization in the intestinal phase of the digestion. Ellagic acid was the major compound detected after in vitro gastro-intestinal digestion of carob syrups. With few exceptions, the anti-oxidant properties of carob syrup were preserved even after digestion. Carob syrup can be considered an important source of phenolic compounds with demonstrated positive effects on human health.
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Affiliation(s)
- Melissa Zannini
- Nutritional Biochemistry Lab, Department of Life Sciences, University of Modena and Reggio Emilia, Via Amendola 2, 42122 Reggio Emilia, Italy; (M.Z.); (A.C.); (D.T.)
| | - Alice Cattivelli
- Nutritional Biochemistry Lab, Department of Life Sciences, University of Modena and Reggio Emilia, Via Amendola 2, 42122 Reggio Emilia, Italy; (M.Z.); (A.C.); (D.T.)
| | - Lorenzo Nissen
- Department of Agricultural and Food Sciences (DISTAL), Alma Mater Studiorum—University of Bologna, Piazza Goidanich 60, 47521 Cesena, Italy; (L.N.); (A.G.)
- Interdepartmental Centre of Agri-Food Industrial Research (CIRI), Alma Mater Studiorum—University of Bologna, Piazza G. Goidanich, 47521 Cesena, Italy
- Centre for Applied Biomedical Research—CRBA, Alma Mater Studiorum—University of Bologna, Policlinico di Sant’Orsola, Via Massarenti 9, 40138 Bologna, Italy
| | - Angela Conte
- Nutritional Biochemistry Lab, Department of Life Sciences, University of Modena and Reggio Emilia, Via Amendola 2, 42122 Reggio Emilia, Italy; (M.Z.); (A.C.); (D.T.)
| | - Andrea Gianotti
- Department of Agricultural and Food Sciences (DISTAL), Alma Mater Studiorum—University of Bologna, Piazza Goidanich 60, 47521 Cesena, Italy; (L.N.); (A.G.)
- Interdepartmental Centre of Agri-Food Industrial Research (CIRI), Alma Mater Studiorum—University of Bologna, Piazza G. Goidanich, 47521 Cesena, Italy
- Centre for Applied Biomedical Research—CRBA, Alma Mater Studiorum—University of Bologna, Policlinico di Sant’Orsola, Via Massarenti 9, 40138 Bologna, Italy
| | - Davide Tagliazucchi
- Nutritional Biochemistry Lab, Department of Life Sciences, University of Modena and Reggio Emilia, Via Amendola 2, 42122 Reggio Emilia, Italy; (M.Z.); (A.C.); (D.T.)
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Silva CS, Tonelli FMP, Delgado VMS, Lourenço VDO, Pinto GDC, Azevedo LS, Lima LARDS, Furtado CA, Ferreira DRC, Tonelli FCP, Parreira AG. Nanoremediation and Antioxidant Potential of Biogenic Silver Nanoparticles Synthesized Using Leucena's Leaves, Stem, and Fruits. Int J Mol Sci 2024; 25:3993. [PMID: 38612800 PMCID: PMC11012344 DOI: 10.3390/ijms25073993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2024] [Revised: 03/19/2024] [Accepted: 03/31/2024] [Indexed: 04/14/2024] Open
Abstract
Synthetic dyes are persistent organic environmental pollutants that can cause extensive damage to living beings and to the ecosystem as a whole. Cost-effective, sustainable, and efficient strategies to deal with this type of pollution are necessary as it commonly resists conventional water treatment methods. Silver nanoparticles (AgNPs) synthesized using the aqueous extract from the leaves, stem, and fruits of Leucaena leucocephala (Leucena) were produced and characterized through UV-vis, TEM, EDS, SDL, XPS, XRD, and zeta potential, and they proved to be able to promote adsorption to remediate methylene blue and tartrazine pollution in water. The nanoremediation was performed and did not require direct exposure to sunlight or any special lamp or a specific reduction agent. The AgNPs produced using the extract from the leaves exhibited the best performance in nanoremediation and also presented antioxidant activity that surpassed the one from butylated hydroxytoluene (BHT). Consequently, it is an interesting nanotool to use in dye nanoremediation and/or as an antioxidant nanostructure.
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Affiliation(s)
- Christopher Santos Silva
- Biotechnological Processes Laboratory, Centro-Oeste Campus, Federal University of São João del-Rei, Divinópolis 35501-296, MG, Brazil; (C.S.S.); (V.M.S.D.); (V.d.O.L.); (G.d.C.P.); (F.C.P.T.)
| | - Fernanda Maria Policarpo Tonelli
- Biotechnological Processes Laboratory, Centro-Oeste Campus, Federal University of São João del-Rei, Divinópolis 35501-296, MG, Brazil; (C.S.S.); (V.M.S.D.); (V.d.O.L.); (G.d.C.P.); (F.C.P.T.)
| | - Vinicius Marx Silva Delgado
- Biotechnological Processes Laboratory, Centro-Oeste Campus, Federal University of São João del-Rei, Divinópolis 35501-296, MG, Brazil; (C.S.S.); (V.M.S.D.); (V.d.O.L.); (G.d.C.P.); (F.C.P.T.)
| | - Vitória de Oliveira Lourenço
- Biotechnological Processes Laboratory, Centro-Oeste Campus, Federal University of São João del-Rei, Divinópolis 35501-296, MG, Brazil; (C.S.S.); (V.M.S.D.); (V.d.O.L.); (G.d.C.P.); (F.C.P.T.)
| | - Geicielly da Costa Pinto
- Biotechnological Processes Laboratory, Centro-Oeste Campus, Federal University of São João del-Rei, Divinópolis 35501-296, MG, Brazil; (C.S.S.); (V.M.S.D.); (V.d.O.L.); (G.d.C.P.); (F.C.P.T.)
| | - Lucas Santos Azevedo
- Phytochemistry Laboratory, Centro-Oeste Campus, Federal University of São João del-Rei, Divinópolis 35501-296, MG, Brazil; (L.S.A.); (L.A.R.d.S.L.)
| | | | - Clascídia Aparecida Furtado
- Carbon Nanostructure Chemistry Laboratory, Nuclear Technology Development Center (CDTN), Belo Horizonte 31270-901, MG, Brazil; (C.A.F.); (D.R.C.F.)
| | - Danilo Roberto Carvalho Ferreira
- Carbon Nanostructure Chemistry Laboratory, Nuclear Technology Development Center (CDTN), Belo Horizonte 31270-901, MG, Brazil; (C.A.F.); (D.R.C.F.)
| | - Flávia Cristina Policarpo Tonelli
- Biotechnological Processes Laboratory, Centro-Oeste Campus, Federal University of São João del-Rei, Divinópolis 35501-296, MG, Brazil; (C.S.S.); (V.M.S.D.); (V.d.O.L.); (G.d.C.P.); (F.C.P.T.)
| | - Adriano Guimarães Parreira
- Protein Chemistry Laboratory, Centro-Oeste Campus, Federal University of São João del-Rei, Divinópolis 35501-296, MG, Brazil;
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Hwang W, Lee J, Choi MJ. Optimization and characterization of high internal phase double emulsion (HIPDE) stabilized by with soybean protein isolate, gallic acid and xanthan gum. Int J Biol Macromol 2024; 264:130562. [PMID: 38431022 DOI: 10.1016/j.ijbiomac.2024.130562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2024] [Revised: 02/26/2024] [Accepted: 02/28/2024] [Indexed: 03/05/2024]
Abstract
This study aims to formulate a stable high internal phase double emulsion (HIPDE) using soybean protein isolate (SPI), gallic acid (GA), and xanthan gum (XG). To prepare HIPDE, W1/O was formulated with the water phase dispersed in the oil phase using polyglycerol polyricinoleate (PGPR) as a stabilizer. Thereafter, W1/O dispersed in W2 (SPI solution) was used. To stabilize the HIPDE, GA was added in W1 (0 or 1 %), XG was added in W2 (0 or 1 %), and the pH of the W phases was adjusted to acidic, neutral, and basic. The samples containing GA in W1 and XG in W2 did not phase out during the storage periods and maintained a higher ζ-potential value, a higher apparent viscosity, and a more sustainable droplet compared to others. These results were derived by the interaction between SPI and XG, SPI and GA, or GA and PGPR. Physicochemical crosslinks were formed, such as gallate-derived groups, SPI-GA complexation (Michael addition, Shiff base reaction), and hydrogen bonding. In conclusion, applying the SPI, GA, and XG to HIPDE would contribute to various industries such as food, medicine, and cosmetics.
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Affiliation(s)
- Woongjun Hwang
- Department of Food Science and Biotechnology of Animal Resources, Konkuk University, Seoul 05029, South Korea
| | - Jiseon Lee
- Department of Food Science & Biotechnology, Sejong University, Seoul 05006, South Korea
| | - Mi-Jung Choi
- Department of Food Science and Biotechnology of Animal Resources, Konkuk University, Seoul 05029, South Korea.
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Ertan K, Sahin S, Sumnu G. Effects of alkaline pH and gallic acid enrichment on the physicochemical properties of sesame protein and common vetch starch-based composite films. Int J Biol Macromol 2024; 257:128743. [PMID: 38100960 DOI: 10.1016/j.ijbiomac.2023.128743] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Revised: 11/27/2023] [Accepted: 12/09/2023] [Indexed: 12/17/2023]
Abstract
In this study, sesame (Sesamum indicum L.) meal protein and common vetch (Vicia sativa L.) starch were extracted and used to obtain biodegradable composite films at different pH values (7, 9, and 11). Films were plasticized with glycerol (2.5 %) and enriched with gallic acid (0.25 %). Increasing pH promoted mechanical properties of the films with the developed barrier and thermal characteristics. Gallic acid addition at pH 7 resulted in lower tensile strength and higher elongation by reducing intermolecular forces, and a shift of diffraction peaks through lower angles due to crystal lattice expansion, as compared to neutral films without gallic acid. On the other hand, gallic acid-enriched films at neutral pH exhibited superior antioxidant properties. The mild alkalinity with gallic acid provided the lowest water vapor permeability, high thermal stability, improved mechanical properties and light barrier property due to deprotonation and subsequent interactions with biopolymers. The FTIR spectrum confirmed intense interactions, such as crosslinking and covalent bonding, promoted by mild alkalinity. Therefore, sesame protein and common vetch starch-based composite film with gallic acid incorporation at pH 9 can be recommended to be used in biodegradable active food packaging applications.
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Affiliation(s)
- Kubra Ertan
- Department of Food Engineering, Middle East Technical University, 06800 Ankara, Turkey; Department of Food Engineering, Faculty of Engineering and Architecture, Burdur Mehmet Akif Ersoy University, Istiklal Campus, 15030 Burdur, Turkey
| | - Serpil Sahin
- Department of Food Engineering, Middle East Technical University, 06800 Ankara, Turkey.
| | - Gulum Sumnu
- Department of Food Engineering, Middle East Technical University, 06800 Ankara, Turkey
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Riyad YM, Elmorsi TM, Alam MG, Abel B. Surface Functionalization of Bioactive Hybrid Adsorbents for Enhanced Adsorption of Organic Dyes. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2023; 20:ijerph20095750. [PMID: 37174267 PMCID: PMC10177766 DOI: 10.3390/ijerph20095750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2023] [Revised: 04/17/2023] [Accepted: 04/21/2023] [Indexed: 05/15/2023]
Abstract
In this study, a valuable adsorbent was functionalized using commercial ZnO and a mango seed extract (MS-Ext) as a green approach for synthesis. Fourier-transform infrared spectroscopy, transmission electron microscopy, scanning electron microscopy, and energy-dispersive X-ray analysis spectraconfirmed the presence of bioactive phenolic compounds and Cu2+ ions on the surface of ZnO. Functionalized Cu-doped ZnO/MS-Ext exhibits high efficacy in acidic, neutral, and alkaline medium, as indicated by 98.3% and 93.7% removal of methylene blue (MB) and crystal violet (CV) dyes, respectively. Cu-doped ZnO/MS-Ext has a zeta potential significantly lower than pristine zinc oxide (p-ZnO), which results in enhanced adsorption of cationic MB and CV dyes. In binary systems, both MB and CV were significantly removed in acidic and alkaline media, with 92% and 87% being removed for CV in acidic and alkaline media, respectively. In contrast, the removal efficiency of methyl orange dye (MO) was 16.4%, 6.6% and 11.2% for p-ZnO, ZnO/Ext and Cu-doped ZnO/Ext, respectively. In general, the adsorption kinetics of MB on Cu-doped ZnO/MS-Ext follow this order: linear pseudo-second-order (PSO) > nonlinear pseudo-second-order (PSO) > nonlinear Elovich model > linear Elovich model. The Langmuir isotherm represents the adsorption process and indicates that MB, CV, and MO are chemisorbed onto the surface of the adsorbent at localized active centers of the MS-extract functional groups. In a binary system consisting of MB and CV, the maximum adsorption capacity (qm) was 72.49 mg/g and 46.61 mg/g, respectively. The adsorption mechanism is governed by electrostatic attraction and repulsion, coordination bonds, and π-π interactions between cationic and anionic dyes upon Cu-doped ZnO/Ext surfaces.
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Affiliation(s)
- Yasser M Riyad
- Department of Chemistry, Faculty of Science, Islamic University of Madinah, Madinah 42351, Saudi Arabia
| | - Taha M Elmorsi
- Department of Chemistry, Faculty of Science, Al-Azhar University, Cairo 11884, Egypt
| | - Mohd Gulfam Alam
- Department of Chemistry, Faculty of Science, Islamic University of Madinah, Madinah 42351, Saudi Arabia
| | - Bernd Abel
- Institute of Chemical Technology, Leipzig University, Linne´-Strasse 3, 04103 Leipzig, Germany
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Djaniš JP, Periša J, Boštjančič PH, Mihajlovski K, Lazić V, Dramićanin M, Lisjak D. Barium hexaferrite nanoplatelets with polyphenol coatings for versatile applications as a stable, magnetic, and antimicrobial colloid. Colloids Surf B Biointerfaces 2023; 224:113198. [PMID: 36773411 DOI: 10.1016/j.colsurfb.2023.113198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Revised: 01/24/2023] [Accepted: 02/06/2023] [Indexed: 02/10/2023]
Abstract
Colloidal stabilization of magnetic nanoparticles is one of the most important steps in the preparation of magnetic nanoparticles for potential biomedical applications. A special kind of magnetic nanoparticle are barium hexaferrite nanoplatelets (BSHF NPLs) with a hexagonal shape and a permanent magnetic moment. One strategy for the stabilization of BHF in aqueous media is to use coatings. In our research, we used an eco-friendly tannic acid, as a coating on BSHF NPLs. As-prepared BSHF NPLs coated with tannic acid were examined with transmission electron microscopy, infrared and UV-Vis spectroscopy, electro-kinetic measurements, and their room-temperature magnetic properties were measured. Stable colloids were tested in two biological complex media and antimicrobial properties of the material were examined. To enhance the antimicrobial properties of our material, we used tannic acid as a platform for the in-situ production of silver on BSHF NPLs. New hybrid material with silver also possesses magnetic properties and excellent antimicrobial activity against Escherichia coli and Staphylococcus aureus.
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Affiliation(s)
- Jelena Papan Djaniš
- Department for the Synthesis of Materials, Jožef Stefan Institute, 1000 Ljubljana, Slovenia; Centre of Excellence for Photoconversion, Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Belgrade, 11351 Belgrade, Serbia.
| | - Jovana Periša
- Centre of Excellence for Photoconversion, Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Belgrade, 11351 Belgrade, Serbia
| | | | - Katarina Mihajlovski
- Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, Belgrade, Serbia
| | - Vesna Lazić
- Centre of Excellence for Photoconversion, Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Belgrade, 11351 Belgrade, Serbia
| | - Miroslav Dramićanin
- Centre of Excellence for Photoconversion, Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Belgrade, 11351 Belgrade, Serbia
| | - Darja Lisjak
- Department for the Synthesis of Materials, Jožef Stefan Institute, 1000 Ljubljana, Slovenia
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Enrique Cuevas-Suárez C, Aldrighi Münchow E, Gonçalves Schwarzbold C, Kuhn Rutz J, Fernandes da Silva A, Piva E. Effect of naturally derived antioxidants as polymerization inhibitors on experimental adhesive resins. J Photochem Photobiol A Chem 2023. [DOI: 10.1016/j.jphotochem.2022.114368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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8
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Adsorption of gallic acid by tailor-made magnetic metal-ceramic nanocomposites. J Mol Liq 2023. [DOI: 10.1016/j.molliq.2022.121083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Abstract
Lytic polysaccharide monooxygenases (LPMOs) are unique redox enzymes capable of disrupting the crystalline surfaces of industry-relevant recalcitrant polysaccharides, such as chitin and cellulose. Historically, LPMOs were thought to be slow enzymes relying on O2 as the co-substrate, but it is now clear that these enzymes prefer H2O2, allowing for fast depolymerization of polysaccharides through a peroxygenase reaction. Thus, quantifying H2O2 in LPMO reaction set-ups is of a great interest. The horseradish peroxidase (HRP)/Amplex Red (AR) assay is one of the most popular and accessible tools for measuring hydrogen peroxide. This assay has been used in various types of biological and biochemical studies, including LPMO research, but suffers from pitfalls that need to be accounted for. In this Chapter, we discuss this method and its use for assessing the often rate-limiting in situ formation of H2O2 in LPMO reactions. We show that, after accounting for multiple potential side reactions, quantitative data on H2O2 production obtained with the HRP/Amplex Red assay provide useful clues for understanding the catalytic activity of LPMOs, including the impact of reductants and transition metal ions.
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Affiliation(s)
- Anton A Stepnov
- Faculty of Chemistry, Biotechnology and Food Science, NMBU-Norwegian University of Life Sciences, Ås, Norway
| | - Vincent G H Eijsink
- Faculty of Chemistry, Biotechnology and Food Science, NMBU-Norwegian University of Life Sciences, Ås, Norway.
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A Model Iron Gall Ink: An In-Depth Study of Ageing Processes Involving Gallic Acid. Molecules 2022; 27:molecules27238603. [PMID: 36500696 PMCID: PMC9735674 DOI: 10.3390/molecules27238603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2022] [Revised: 11/22/2022] [Accepted: 12/02/2022] [Indexed: 12/12/2022] Open
Abstract
Iron gall inks have been among the most used writing materials after carbon black, thus representing an important element of the historical and artistic heritage of our society. Crucially, the preservation of manuscripts and drawings is influenced by the presence of these inks, leading to conservation issues related to paper degradation and text fading. Besides all the advances obtained in paper conservation, the study of iron gall ink's behaviour and ageing is still an important topic, which requires investigation through an accurate molecular characterisation to produce reliable models. In the present work a micro-destructive method based on liquid chromatography techniques (HPLC-DAD and HPLC-ESI-Q-ToF) has been optimised starting from a model gallic acid-based ink. An in-depth study of the behaviour of the ink in time was performed by natural and artificial ageing tests, monitored by colorimetry, showing the autoxidation of gallic acid to ellagic acid in the prepared mock-ups. The effect of relative humidity on ageing processes was also evaluated, allowing us to determine different intermediates depending on the environmental conditions. Finally, the analytical method developed was then successfully applied for investigating 19th-20th century historical ink samples, where one of the identified ageing markers was detected, besides the expected gallic and ellagic acids.
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Oxygen absorbing food packaging made by extrusion compounding of thermoplastic cassava starch with gallic acid. Food Control 2022. [DOI: 10.1016/j.foodcont.2022.109273] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Fiedot-Toboła M, Dmochowska A, Potaniec B, Czajkowska J, Jędrzejewski R, Wilk-Kozubek M, Carolak E, Cybińska J. Gallic Acid Based Black Tea Extract as a Stabilizing Agent in ZnO Particles Green Synthesis. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:1816. [PMID: 34361207 PMCID: PMC8308264 DOI: 10.3390/nano11071816] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Revised: 07/08/2021] [Accepted: 07/09/2021] [Indexed: 12/12/2022]
Abstract
In this work, zinc oxide particles (ZnO NPs) green synthesis with the application of black tea extract (BT) is presented. A thorough investigation of the properties of the extract and the obtained materials was conducted by using Fourier transform infrared spectroscopy (FTIR), liquid chromatography-mass spectrometry (LC-MS), X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and quadrupole mass spectroscopy (QMS). The obtained results indicated that the amount of used BT strongly influenced the morphology, chemical, and crystalline structure of the obtained particles. The investigation demonstrated that the substance present in black tea (BT) extract, which was adsorbed on the ZnO surface, was in fact gallic acid. It was found that gallic acid controls the crystallization process of ZnO by temporarily blocking the zinc cations. Additionally, these organic molecules interact with the hydroxide group of the precipitant. This blocks the dehydration process stabilizing the zinc hydroxide forms and hinders its transformation into zinc oxide. Performed measurements indicated that obtained ZnO particles have great antioxidant and antimicrobial properties, which are significantly correlated with ZnO-gallic acid interactions.
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Affiliation(s)
- Marta Fiedot-Toboła
- Łukasiewicz Research Network−PORT Polish Center for Technology Development, Stabłowicka 147, 54-066 Wrocław, Poland; (A.D.); (B.P.); (J.C.); (R.J.); (M.W.-K.); (E.C.); (J.C.)
| | - Anna Dmochowska
- Łukasiewicz Research Network−PORT Polish Center for Technology Development, Stabłowicka 147, 54-066 Wrocław, Poland; (A.D.); (B.P.); (J.C.); (R.J.); (M.W.-K.); (E.C.); (J.C.)
| | - Bartłomiej Potaniec
- Łukasiewicz Research Network−PORT Polish Center for Technology Development, Stabłowicka 147, 54-066 Wrocław, Poland; (A.D.); (B.P.); (J.C.); (R.J.); (M.W.-K.); (E.C.); (J.C.)
| | - Joanna Czajkowska
- Łukasiewicz Research Network−PORT Polish Center for Technology Development, Stabłowicka 147, 54-066 Wrocław, Poland; (A.D.); (B.P.); (J.C.); (R.J.); (M.W.-K.); (E.C.); (J.C.)
| | - Roman Jędrzejewski
- Łukasiewicz Research Network−PORT Polish Center for Technology Development, Stabłowicka 147, 54-066 Wrocław, Poland; (A.D.); (B.P.); (J.C.); (R.J.); (M.W.-K.); (E.C.); (J.C.)
| | - Magdalena Wilk-Kozubek
- Łukasiewicz Research Network−PORT Polish Center for Technology Development, Stabłowicka 147, 54-066 Wrocław, Poland; (A.D.); (B.P.); (J.C.); (R.J.); (M.W.-K.); (E.C.); (J.C.)
| | - Ewa Carolak
- Łukasiewicz Research Network−PORT Polish Center for Technology Development, Stabłowicka 147, 54-066 Wrocław, Poland; (A.D.); (B.P.); (J.C.); (R.J.); (M.W.-K.); (E.C.); (J.C.)
| | - Joanna Cybińska
- Łukasiewicz Research Network−PORT Polish Center for Technology Development, Stabłowicka 147, 54-066 Wrocław, Poland; (A.D.); (B.P.); (J.C.); (R.J.); (M.W.-K.); (E.C.); (J.C.)
- Faculty of Chemistry, University of Wroclaw, 14 F. Joliot-Curie Str., 50-383 Wroclaw, Poland
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Simulation Study to Investigate the Effects of Operational Conditions on Methylcyclohexane Dehydrogenation for Hydrogen Production. ENERGIES 2020. [DOI: 10.3390/en13010206] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In the recent era, hydrogen has gained immense consideration as a clean-energy carrier. Its storage is, however, still the main hurdle in the implementation of a hydrogen-based clean economy. Liquid organic hydrogen carriers (LOHCs) are a potential option for hydrogen storage in ambient conditions, and can contribute to the clean-fuel concept in the future. In the present work, a parametric and simulation study was carried out for the storage and release of hydrogen for the methylcyclohexane toluene system. In particular, the methylcyclohexane dehydrogenation reaction is investigated over six potential catalysts for the temperature range of 300–450 °C and a pressure range of 1–3 bar to select the best catalyst under optimum operating conditions. Moreover, the effects of hydrogen addition in the feed mixture, and byproduct yield, are also studied as functions of operating conditions. The best catalyst selected for the process is 1 wt. % Pt/γ-Al2O3. The optimum operating conditions selected for the dehydrogenation process are 360 °C and 1.8 bar. Hydrogen addition in the feed reduces the percentage of methylcyclohexane conversion but is required to enhance the catalyst’s stability. Aspen HYSYS v. 9.0 (AspenTech, Lahore, Pakistan) has been used to carry out the simulation study.
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