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González-Ingelmo M, Granda M, Ruiz B, Fuente E, Sierra U, Rocha VG, González Z, Álvarez P, Menéndez R. Proactive Effect of Algae-Based Graphene Support on the Oxygen Evolution Reaction Electrocatalytic Activity of NiFe. Materials (Basel) 2023; 16:7641. [PMID: 38138783 PMCID: PMC10744590 DOI: 10.3390/ma16247641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 11/13/2023] [Accepted: 11/22/2023] [Indexed: 12/24/2023]
Abstract
The preparation of graphene materials from biomass resources is still a challenge, even more so if they are going to be employed as supports for electrocatalysts for water splitting. Herein, we describe the preparation and characterization of graphene oxides (GOs) from solid macroalgae waste obtained after processing an agar-agar residue. The structural and morphological characterization of the obtained GO confirm the presence of a lamellar material that is composed of few layers with an increased number of heteroatoms (including nitrogen) if compared with those observed in a GO obtained from graphite (reference). Three-dimensional electrodes were prepared from these GOs by depositing them onto a fibrous carbon paper, followed by electrodeposition of the catalyst, NiFe. The electrocatalytic performance of these hybrid systems for the oxygen evolution reaction (OER) showed a proactive effect of both graphene materials toward catalysis. Moreover, the electrode prepared from the algae-based graphene showed the highest electrocatalytic activity. This fact could be explained by the different structure of the algae-based graphene which, due to differences in the nucleation growth patterns and electroactive sites developed during the electrodeposition process, produced more reactive NiFe species (higher oxidation state).
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Affiliation(s)
- María González-Ingelmo
- Instituto de Ciencia y Tecnología del Carbono (INCAR), CSIC, Francisco Pintado, Fe 26, 33011 Oviedo, Spain; (M.G.-I.); (M.G.); (B.R.); (E.F.); (V.G.R.); (Z.G.)
| | - Marcos Granda
- Instituto de Ciencia y Tecnología del Carbono (INCAR), CSIC, Francisco Pintado, Fe 26, 33011 Oviedo, Spain; (M.G.-I.); (M.G.); (B.R.); (E.F.); (V.G.R.); (Z.G.)
| | - Begoña Ruiz
- Instituto de Ciencia y Tecnología del Carbono (INCAR), CSIC, Francisco Pintado, Fe 26, 33011 Oviedo, Spain; (M.G.-I.); (M.G.); (B.R.); (E.F.); (V.G.R.); (Z.G.)
| | - Enrique Fuente
- Instituto de Ciencia y Tecnología del Carbono (INCAR), CSIC, Francisco Pintado, Fe 26, 33011 Oviedo, Spain; (M.G.-I.); (M.G.); (B.R.); (E.F.); (V.G.R.); (Z.G.)
| | - Uriel Sierra
- Laboratorio Nacional de Materiales Grafénicos, Centro de Investigación en Química Aplicada, Blvd. Enrique Reyna Hermosillo, 140, Saltillo 25294, Mexico;
| | - Victoria G. Rocha
- Instituto de Ciencia y Tecnología del Carbono (INCAR), CSIC, Francisco Pintado, Fe 26, 33011 Oviedo, Spain; (M.G.-I.); (M.G.); (B.R.); (E.F.); (V.G.R.); (Z.G.)
| | - Zoraida González
- Instituto de Ciencia y Tecnología del Carbono (INCAR), CSIC, Francisco Pintado, Fe 26, 33011 Oviedo, Spain; (M.G.-I.); (M.G.); (B.R.); (E.F.); (V.G.R.); (Z.G.)
| | - Patricia Álvarez
- Instituto de Ciencia y Tecnología del Carbono (INCAR), CSIC, Francisco Pintado, Fe 26, 33011 Oviedo, Spain; (M.G.-I.); (M.G.); (B.R.); (E.F.); (V.G.R.); (Z.G.)
| | - Rosa Menéndez
- Instituto de Ciencia y Tecnología del Carbono (INCAR), CSIC, Francisco Pintado, Fe 26, 33011 Oviedo, Spain; (M.G.-I.); (M.G.); (B.R.); (E.F.); (V.G.R.); (Z.G.)
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Rezaei S, Doaei S, Tabrizi R, Ghobadi S, Zare M, Gholamalizadeh M, Mazloom Z. The effects of macro-algae supplementation on serum lipid, glycaemic control and anthropometric indices: A systematic review and meta-analysis of clinical trials. Endocrinol Diabetes Metab 2023; 6:e439. [PMID: 37469128 PMCID: PMC10495559 DOI: 10.1002/edm2.439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 06/25/2023] [Accepted: 07/02/2023] [Indexed: 07/21/2023] Open
Abstract
INTRODUCTION Macro-algae products have been shown to ameliorate the metabolic disorders state. Thus, highlighting their function as supplementary therapeutic agents can be a novel strategy for clinical therapies. This systematic review and meta-analysis of clinical trials aimed to summarize the effect of macro-algae consumption on serum lipid profile, glycaemic control and anthropometric factors. METHODS In this systematic review and meta-analysis, a comprehensive search was performed for relevant studies published up to May 2023. The Cochran's Q test and I-square (I2 ) tests were used to evaluate heterogeneity across the included studies. The meta-analysis was conducted using random-effects model (DerSimonian and Laird), and weighted mean difference (WMD) was considered as the pooled effect size. RESULTS Out of 8602 papers in the initial screening, eight clinical trials with a total of 438 participants were included into this meta-analysis. The results indicated that macro-algae supplementation significantly decreased serum levels of total cholesterol (TC) (WMD = -6.7 mg/dL; 95% CI: -12.59, -0.80; item = 0.026) and low-density lipoprotein cholesterol (LDL-c) (WMD = -8.25 mg/dL; 95% CI: -15.38, -1.12; p-value = .023). There was an increase in level of high-density lipoprotein cholesterol (HDL-c) (WMD = 0.48 mg/dL; 95% CI: -2.05, 3.01; p-value = .71) which was not statistically significant. Macro-algae supplementation reduced body mass index (BMI) (WMD = -0.28 kg/m2 ; 95% CI: -0.96, 0.41; p-value = .426), weight (WMD = -0.39 kg; 95% CI: -3.6, 2.83; p-value = .81), waist circumference (WC) (WMD = -0.52 cm; 95% CI: -2.71, 1.66; p-value = .64), fasting blood sugar (FBS) (WMD = -1.95 mg/dL; 95% CI: -5.19, 1.28; p-value = .24) and HbA1c (WMD = -0.02%; 95% CI: -0.14, 0.09; p-value = .66) in intervention group. CONCLUSIONS This meta-analysis indicated that macro-algae supplementation significantly decreased TC and LDL-c level. It can also increase HDL-c level and reduce anthropometric indices and glycaemic control factors.
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Affiliation(s)
- Shahla Rezaei
- Student Research CommitteeShiraz University of Medical SciencesShirazIran
- Nutrition Research Center, School of Nutrition and Food SciencesShiraz University of Medical SciencesShirazIran
| | - Saeid Doaei
- Department of Community Nutrition, Faculty of Nutrition and Food Technology, National Nutrition and Food Technology Research InstituteShahid Beheshti University of Medical SciencesTehranIran
| | - Reza Tabrizi
- Non‐Communicable Diseases Research CenterFasa University of Medical SciencesFasaIran
| | - Saeed Ghobadi
- Nutrition Research Center, School of Nutrition and Food SciencesShiraz University of Medical SciencesShirazIran
- Institute for Physical Activity and Nutrition, School of Exercise and Nutrition SciencesDeakin UniversityMelbourneVictoriaAustralia
| | - Morteza Zare
- Nutrition Research Center, School of Nutrition and Food SciencesShiraz University of Medical SciencesShirazIran
| | | | - Zohreh Mazloom
- Department of Clinical Nutrition, School of Nutrition and Food SciencesShiraz University of Medical SciencesShirazIran
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Horta A, Pinteus S, Alves C, Fino N, Silva J, Fernandez S, Rodrigues A, Pedrosa R. Antioxidant and antimicrobial potential of the Bifurcaria bifurcata epiphytic bacteria. Mar Drugs 2014; 12:1676-89. [PMID: 24663118 PMCID: PMC3967231 DOI: 10.3390/md12031676] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2013] [Revised: 01/14/2014] [Accepted: 03/04/2014] [Indexed: 11/16/2022] Open
Abstract
Surface-associated marine bacteria are an interesting source of new secondary metabolites. The aim of this study was the isolation and identification of epiphytic bacteria from the marine brown alga, Bifurcaria bifurcata, and the evaluation of the antioxidant and antimicrobial activity of bacteria extracts. The identification of epiphytic bacteria was determined by 16S rRNA gene sequencing. Bacteria extracts were obtained with methanol and dichloromethane (1:1) extraction. The antioxidant activity of extracts was performed by quantification of total phenolic content (TPC), 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity and oxygen radical absorbance capacity (ORAC). Antimicrobial activities were evaluated against Escherichia coli, Pseudomonas aeruginosa, Bacillus subtilis, Salmonella enteritidis, Staphylococcus aureus, Saccharomyces cerevisiae and Candida albicans. A total of 39 Bifurcaria bifurcata-associated bacteria were isolated and 33 were identified as Vibrio sp. (48.72%), Alteromonas sp. (12.82%), Shewanella sp. (12.26%), Serratia sp. (2.56%), Citricoccus sp. (2.56%), Cellulophaga sp. (2.56%), Ruegeria sp. (2.56%) and Staphylococcus sp. (2.56%). Six (15.38%) of the 39 bacteria Bifurcaria bifurcata-associated bacteria presented less than a 90% Basic Local Alignment Search Tool (BLAST) match, and some of those could be new. The highest antioxidant activity and antimicrobial activity (against B. subtilis) was exhibited by strain 16 (Shewanella sp.). Several strains also presented high antimicrobial activity against S. aureus, mainly belonging to Alteromonas sp. and Vibrio sp. There were no positive results against fungi and Gram-negative bacteria. Bifurcaria bifurcata epiphytic bacteria were revealed to be excellent sources of natural antioxidant and antimicrobial compounds.
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Affiliation(s)
- André Horta
- Marine Resources Research Group (GIRM), School of Tourism and Maritime Technology (ESTM), Polytechnic Institute of Leiria, 2520-641 Peniche, Portugal.
| | - Susete Pinteus
- Marine Resources Research Group (GIRM), School of Tourism and Maritime Technology (ESTM), Polytechnic Institute of Leiria, 2520-641 Peniche, Portugal.
| | - Celso Alves
- Marine Resources Research Group (GIRM), School of Tourism and Maritime Technology (ESTM), Polytechnic Institute of Leiria, 2520-641 Peniche, Portugal.
| | - Nádia Fino
- Marine Resources Research Group (GIRM), School of Tourism and Maritime Technology (ESTM), Polytechnic Institute of Leiria, 2520-641 Peniche, Portugal.
| | - Joana Silva
- Marine Resources Research Group (GIRM), School of Tourism and Maritime Technology (ESTM), Polytechnic Institute of Leiria, 2520-641 Peniche, Portugal.
| | - Sara Fernandez
- Higher School of Agricultural Engineering (ETSEA), University of Lleida, E-25003 Lleida, Spain.
| | - Américo Rodrigues
- Marine Resources Research Group (GIRM), School of Tourism and Maritime Technology (ESTM), Polytechnic Institute of Leiria, 2520-641 Peniche, Portugal.
| | - Rui Pedrosa
- Marine Resources Research Group (GIRM), School of Tourism and Maritime Technology (ESTM), Polytechnic Institute of Leiria, 2520-641 Peniche, Portugal.
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Morris CA, Owen JR, Thomas MC, El-Hiti GA, Harwood JL, Kille P. Intracellular localization and induction of a dynamic RNA-editing event of macro-algal V-ATPase subunit A (VHA-A) in response to copper. Plant Cell Environ 2014; 37:189-203. [PMID: 23738980 DOI: 10.1111/pce.12145] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2013] [Revised: 05/15/2013] [Accepted: 05/18/2013] [Indexed: 06/02/2023]
Abstract
A V-ATPase subunit A protein (VHA-A) transcript together with a variant (C793 to U), which introduces a stop codon truncating the subunit immediately downstream of its ATP binding site, was identified within a Fucus vesiculosus cDNA from a heavy metal contaminated site. This is intriguing because the VHA-A subunit is the crucial catalytic subunit responsible for the hydrolysis of ATP that drives ion transport underlying heavy metal detoxification pathways. We employed a chemiluminescent hybridization protection assay to quantify the proportion of both variants directly from mRNA while performing quantification of total transcript using Q-PCR. Polyclonal antisera raised against recombinant VHA-A facilitated simultaneous detection of parent and truncated VHA-A and revealed its cellular and subcellular localization. By exploiting laboratory exposures and samples from an environmental copper gradient, we showed that total VHA-A transcript and protein, together with levels of the truncated variant, were induced by copper. The absence of a genomic sequence representing the truncated variant suggests a RNA editing event causing the production of the truncated VHA-A. Based on these observations, we propose RNA editing as a novel molecular process underpinning VHA trafficking and intracellular sequestration of heavy metals under stress.
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Affiliation(s)
- C A Morris
- School of Biosciences, Cardiff University, Cardiff, CF10 3AT, Wales, UK
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Jiménez E, Dorta F, Medina C, Ramírez A, Ramírez I, Peña-Cortés H. Anti-phytopathogenic activities of macro-algae extracts. Mar Drugs 2011; 9:739-756. [PMID: 21673886 PMCID: PMC3111179 DOI: 10.3390/md9050739] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2011] [Revised: 04/07/2011] [Accepted: 04/15/2011] [Indexed: 12/30/2022] Open
Abstract
Aqueous and ethanolic extracts obtained from nine Chilean marine macro-algae collected at different seasons were examined in vitro and in vivo for properties that reduce the growth of plant pathogens or decrease the injury severity of plant foliar tissues following pathogen infection. Particular crude aqueous or organic extracts showed effects on the growth of pathogenic bacteria whereas others displayed important effects against pathogenic fungi or viruses, either by inhibiting fungal mycelia growth or by reducing the disease symptoms in leaves caused by pathogen challenge. Organic extracts obtained from the brown-alga Lessonia trabeculata inhibited bacterial growth and reduced both the number and size of the necrotic lesion in tomato leaves following infection with Botrytis cinerea. Aqueous and ethanolic extracts from the red-alga Gracillaria chilensis prevent the growth of Phytophthora cinnamomi, showing a response which depends on doses and collecting-time. Similarly, aqueous and ethanolic extracts from the brown-alga Durvillaea antarctica were able to diminish the damage caused by tobacco mosaic virus (TMV) in tobacco leaves, and the aqueous procedure is, in addition, more effective and seasonally independent. These results suggest that macro-algae contain compounds with different chemical properties which could be considered for controlling specific plant pathogens.
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Affiliation(s)
- Edra Jiménez
- Biotechnology Center “D. Alkalay L.”, Universidad Técnica Federico Santa María, Avda. España 1680, Valparaiso, Chile; E-Mails: (E.J.); (F.D.); (I.R.)
| | - Fernando Dorta
- Biotechnology Center “D. Alkalay L.”, Universidad Técnica Federico Santa María, Avda. España 1680, Valparaiso, Chile; E-Mails: (E.J.); (F.D.); (I.R.)
| | - Cristian Medina
- Fundación Chile, Avda. Parque Antonio Rabat Sur 6165, Vitacura, Santiago, Chile; E-Mails: (C.M.); (A.R.)
| | - Alberto Ramírez
- Fundación Chile, Avda. Parque Antonio Rabat Sur 6165, Vitacura, Santiago, Chile; E-Mails: (C.M.); (A.R.)
| | - Ingrid Ramírez
- Biotechnology Center “D. Alkalay L.”, Universidad Técnica Federico Santa María, Avda. España 1680, Valparaiso, Chile; E-Mails: (E.J.); (F.D.); (I.R.)
| | - Hugo Peña-Cortés
- Biotechnology Center “D. Alkalay L.”, Universidad Técnica Federico Santa María, Avda. España 1680, Valparaiso, Chile; E-Mails: (E.J.); (F.D.); (I.R.)
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