Antimicrobial Potential of Chitosan Films Incorporated with Alcoholic Extract from Mimosa tenuiflora Leaves Arnaud Victor dos Santos, Rodrigo N. Santos, Aiane N. Santana, Andreza Santos de Jesus, Suzimone de Jesus C. Torquato, et al. Chemistry and Biodiversity, 2025 Antimicrobial films were prepared with chitosan containing the methanolic extract of M. tenuiflora leaves (FECT20 %, FECT30 %, and FECT40 %), and their antimicrobial activities were evaluated by agar diffusion. The films were characterized by IR spectroscopy, scanning electron microscopy (SEM) and TG/DTG curves. TG/DTG curves showed thermal stability of chitosan‐extract films up to 166 °C. Micrographs of chitosan‐extract films revealed an increase in porosity with the addition of extract. The FECT40 % film showed inhibition zone diameters (IZ) against Micrococcus luteus, Staphylococcus aureus, Bacillus subtilis, and B. cereus, ranging from 1.0±0.02 to 0.72±0.09 cm. Only FECT30 % and FECT40 % inhibited the P. aeruginosa with IZs of 0.68±0.02 and 0.77±0.06 cm, respectively. In turn, the extract showed inhibition against B. subtilis and B. cereus, with IZs values of 0.92±0.2 cm and 0.72±0.05 cm, respectively. Additionally, the crude extract presented antioxidant potential with inhibition percentages of 32.74 %±0.90 for ABTS and 27.04 %±1.36 for DPPH. The antimicrobial and antioxidant activities of the crude extract, as well as the antimicrobial property of chitosan‐extract films, suggests the potential of these biopolymers for the development of wound healing bandages and new food packaging alternatives.
Exploiting Micrometer-Scale Replication of Fungal Biotemplates for Multifunctional Uses in Electrochemistry and SERS Substrates Verônica B. Maciel, Adriana M. Fontes, Regina Geris, Zênis N. da Rocha, Jéssica G. S. Ramalho, et al. ACS Omega, 2024 In this paper, filamentous fungi have been used as biotemplates to integrate gold nanoparticles (Au-NPs) into the cell wall. A new chemical mechanism has been proposed to elucidate the assimilation of Au-NPs by fungi, considering the ionic current that arises in the function of fungal metabolism. After biological components were eliminated, mycelium-like gold microtubes have been obtained using different fungal species as precursors. Mycelium-like gold microtubes replicate the biological shape of fungi, presenting inherent multifunctionality. This work presents two promising applications for this material: high surface area electrodes for electrochemical experiments and substrates for SERS detection of organic molecules such as Rhodamine 6G.
Exploring Culture Media Diversity to Produce Fungal Secondary Metabolites and Cyborg Cells Regina Geris, Vitória Evelyn Teles de Jesus, Antonio Ferreira da Silva, Marcos Malta Chemistry and Biodiversity, 2024 Fungi are microorganisms of significant biotechnological importance due to their ability to provide food and produce several value‐added secondary metabolites and enzymes. Its products move billions of dollars in the pharmaceutical, cosmetics, and additives sectors. These microorganisms also play a notable role in bionanotechnology, leading to the production of hybrid biological‐inorganic materials (such as cyborg cells) and the use of their enzyme complex in the biosynthesis of nanoparticles. In this sense, optimizing the fungal growth process is necessary, with selecting the cultivation medium as one of the essential factors for the microorganism to reach its maximum metabolic expression. The culture medium‘s composition can also impact the nanomaterial's stability and prevent the incorporation of nanoparticles into fungal cells. Therefore, our main objectives are the following: (1) compile and discuss the most commonly employed culture media for the production of fungal secondary metabolites and the formation of cyborg cells, accompanied by preparation methods; (2) provide a six‐step guide to investigating the fungal metabolomic profile and (3) discuss the main procedures of microbial cultivation to produce fungal cyborg cells.
A Review about the Mycoremediation of Soil Impacted by War-like Activities: Challenges and Gaps Regina Geris, Marcos Malta, Luar Aguiar Soares, Lourdes Cardoso de Souza Neta, Natan Silva Pereira, et al. Journal of Fungi, 2024 (1) Background: The frequency and intensity of war-like activities (war, military training, and shooting ranges) worldwide cause soil pollution by metals, metalloids, explosives, radionuclides, and herbicides. Despite this environmentally worrying scenario, soil decontamination in former war zones almost always involves incineration. Nevertheless, this practice is expensive, and its efficiency is suitable only for organic pollutants. Therefore, treating soils polluted by wars requires efficient and economically viable alternatives. In this sense, this manuscript reviews the status and knowledge gaps of mycoremediation. (2) Methods: The literature review consisted of searches on ScienceDirect and Web of Science for articles (1980 to 2023) on the mycoremediation of soils containing pollutants derived from war-like activities. (3) Results: This review highlighted that mycoremediation has many successful applications for removing all pollutants of war-like activities. However, the mycoremediation of soils in former war zones and those impacted by military training and shooting ranges is still very incipient, with most applications emphasizing explosives. (4) Conclusion: The mycoremediation of soils from conflict zones is an entirely open field of research, and the main challenge is to optimize experimental conditions on a field scale.
Filamentous fungi as eco-friendly precursors for the synthesis of luminescent green-emitting carbon dots M Soares, I Rigoli, AF da Silva, M Malta, R Geris Journal of Photochemistry and Photobiology B: Biology, 113421 , 2026 2026
Antimicrobial Potential of Chitosan Films Incorporated with Alcoholic Extract from Mimosa tenuiflora Leaves AV Dos Santos, RN Santos, AN Santana, A Santos de Jesus, ... Chemistry & Biodiversity 22 (3), e202400645 , 2025 2025 Citations: 2
Exploiting Micrometer-Scale Replication of Fungal Biotemplates for Multifunctional Uses in Electrochemistry and SERS Substrates VB Maciel, AM Fontes, R Geris, ZN da Rocha, JGS Ramalho, AF da Silva, ... ACS omega 9 (43), 43385-43394 , 2024 2024 Citations: 6
Evaluation of 1, 9-Dimethyl-Methylene Blue nanoencapsulation using rhamnolipid nanoparticles to potentiate the Photodynamic Therapy technique in Candida albicans: In vitro study IPF Nunes, RS de Jesus, JA Almeida, WLR Costa, M Malta, LGP Soares, ... Journal of Photochemistry and Photobiology B: Biology 256, 112943 , 2024 2024 Citations: 3
Exploring culture media diversity to produce fungal secondary metabolites and cyborg cells R Geris, VE Teles de Jesus, A Ferreira da Silva, M Malta Chemistry & Biodiversity 21 (3), e202302066 , 2024 2024 Citations: 15
Previous: Strategic Culture Media Design to Boost Fungal Secondary Metabolite Biosynthesis and Cyborg Cell Growth Current: Exploiting the diversity of culture media to produce … R Geris, M Malta, AF da Silva, VET de Jesus Chemistry & Biodiversity, e202302066-e202302066 , 2024 2024 Citations: 2
A review about the mycoremediation of soil impacted by war-like activities: Challenges and gaps R Geris, M Malta, LA Soares, LC de Souza Neta, NS Pereira, M Soares, ... Journal of Fungi 10 (2), 94 , 2024 2024 Citations: 25
Advanced applications of lignocellulosic fibers and mycelium-based composites for a sustainable world R Geris, S Calil, IC Rigoli, RRL Vidal, AF da Silva, M Malta Trends and innovations in energetic sources, functional compounds and … , 2023 2023 Citations: 6
Advanced fungal bio-based materials for remediation of toxic metals in aquatic ecosystems M de Godoi Pereira, AV dos Santos, R Geris, M Malta Novel materials for environmental remediation applications, 35-62 , 2023 2023 Citations: 5
Mycoremediation of Cd 2+ and Pb 2+ from Aqueous Media by Dead Biomass of Phialomyces macrosporus GFM Brito, R Geris, MS Passos, M Malta, JN Ribeiro, MVVJ Licínio, ... Water, Air, & Soil Pollution 232 (12), 482 , 2021 2021 Citations: 4
Surface studies of the chemical environment in gold nanorods supported by X-ray photoelectron spectroscopy (XPS) and ab initio calculations C Oliveira, CR Chaves, P Bargiela, MGC da Rocha, AF da Silva, ... journal of materials research and technology 15, 768-776 , 2021 2021 Citations: 59
Unveiling the surface and the ultrastructure of palladized fungal biotemplates AM Fontes, C Oliveira, P Bargiela, MGC da Rocha, R Geris, AF da Silva, ... Langmuir 37 (44), 12961-12971 , 2021 2021 Citations: 6
Aging effect on vanadium oxide hybrid nanotubes: a XANES study ME Saleta, D Tobia, M Granada, RD Sánchez, SJA Figueroa, CA López, ... Proceedings of the 30. RAU: annual users meeting LNLS/CNPEM. Abstract book … , 2020 2020
Aging effect on vanadium oxide hybrid nanotubes ME Saleta, D Tobia, SJA Figueroa, CA López, M Granada, RD Sánchez, ... Journal of Physics: Condensed Matter 31 (50), 505701 , 2019 2019 Citations: 3
Photoluminescent organisms: how to make fungi glow through biointegration with lanthanide metal-organic frameworks J Rosário, LL da Luz, R Geris, JGS Ramalho, AF da Silva, SA Júnior, ... Scientific Reports 9 (1), 7302 , 2019 2019 Citations: 30
Functionalization of fungal cells with transition metal oxides for the development of biomimetic hybrid structures VM Bispo, R Geris, M Malta Proceedings of the 41. annual meeting of the Brazilian Society on Chemistry … , 2018 2018
Improving the rates of Pd-catalyzed reactions by exciting the surface plasmons of AuPd bimetallic nanotriangles MK Gangishetty, AM Fontes, M Malta, TL Kelly, RWJ Scott RSC Advances 7 (64), 40218-40226 , 2017 2017 Citations: 25
Síntese sonoquímica de novos híbridos de óxido de vanádio/polímero condutor JR Almeida, AV Santos, TM Benedetti, RM Torresi, M Malta Resumos , 2014 2014
Bio-inspired gold microtubes based on the morphology of filamentous fungi AM Fontes, R Geris, AV Dos Santos, MG Pereira, JGS Ramalho, ... Biomaterials science 2 (7), 956-960 , 2014 2014 Citations: 22
Controlling the energy transfer in lanthanide–organic frameworks for the production of white-light emitting materials LL da Luz, BFL Viana, GCO da Silva, CC Gatto, AM Fontes, M Malta, ... CrystEngComm 16 (30), 6914-6918 , 2014 2014 Citations: 57
MOST CITED SCHOLAR PUBLICATIONS
Nanofibers composite vanadium oxide/polyaniline: synthesis and characterization of an electroactive anisotropic structure M Malta, G Louarn, N Errien, RM Torresi Electrochemistry communications 5 (12), 1011-1015 , 2003 2003 Citations: 118
Técnicas in situ de baixo custo em eletroquímica: a microbalança a cristal de quartzo H Varela, M Malta, RM Torresi Química Nova 23 (5), 664-679 , 2000 2000 Citations: 109
Materiais para cátodos de baterias secundárias de lítio H Varela, F Huguenin, M Malta, RM Torresi Química Nova 25 (2), 287-299 , 2002 2002 Citations: 89
Effect of Additives in the Stabilization of the α Phase of Ni ( OH ) 2 Electrodes SI Córdoba de Torresi, K Provazi, M Malta, RM Torresi Journal of The Electrochemical Society 148 (10), A1179-A1184 , 2001 2001 Citations: 83
Redox behavior of nanohybrid material with defined morphology: Vanadium oxide nanotubes intercalated with polyaniline M Malta, G Louarn, N Errien, RM Torresi Journal of power sources 156 (2), 533-540 , 2006 2006 Citations: 61
Surface studies of the chemical environment in gold nanorods supported by X-ray photoelectron spectroscopy (XPS) and ab initio calculations C Oliveira, CR Chaves, P Bargiela, MGC da Rocha, AF da Silva, ... journal of materials research and technology 15, 768-776 , 2021 2021 Citations: 59
Controlling the energy transfer in lanthanide–organic frameworks for the production of white-light emitting materials LL da Luz, BFL Viana, GCO da Silva, CC Gatto, AM Fontes, M Malta, ... CrystEngComm 16 (30), 6914-6918 , 2014 2014 Citations: 57
Electrochemical and kinetic studies of lithium intercalation in composite nanofibers of vanadium oxide/polyaniline M Malta, RM Torresi Electrochimica acta 50 (25-26), 5009-5014 , 2005 2005 Citations: 57
Electrochemical and chromogenic relaxation processes in polyaniline films M Malta, ER Gonzalez, RM Torresi Polymer 43 (22), 5895-5901 , 2002 2002 Citations: 51
Photoluminescent organisms: how to make fungi glow through biointegration with lanthanide metal-organic frameworks J Rosário, LL da Luz, R Geris, JGS Ramalho, AF da Silva, SA Júnior, ... Scientific Reports 9 (1), 7302 , 2019 2019 Citations: 30
A review about the mycoremediation of soil impacted by war-like activities: Challenges and gaps R Geris, M Malta, LA Soares, LC de Souza Neta, NS Pereira, M Soares, ... Journal of Fungi 10 (2), 94 , 2024 2024 Citations: 25
Improving the rates of Pd-catalyzed reactions by exciting the surface plasmons of AuPd bimetallic nanotriangles MK Gangishetty, AM Fontes, M Malta, TL Kelly, RWJ Scott RSC Advances 7 (64), 40218-40226 , 2017 2017 Citations: 25
Microgravimetric study of the influence of the solvent on the redox properties of polypyrrol modified electrodes H Varela, M Malta, RM Torresi Journal of power sources 92 (1-2), 50-55 , 2001 2001 Citations: 24
Bio-inspired gold microtubes based on the morphology of filamentous fungi AM Fontes, R Geris, AV Dos Santos, MG Pereira, JGS Ramalho, ... Biomaterials science 2 (7), 956-960 , 2014 2014 Citations: 22
Ultrasound‐Assisted Synthesis of Hybrid Vanadium Oxide/Polyaniline Nanowires M Malta, LH Silva, A Galembeck, M Korn Macromolecular rapid communications 29 (14), 1221-1225 , 2008 2008 Citations: 22
Magnetic characterization of vanadium oxide/polyaniline nanotubes ME Saleta, J Curiale, HE Troiani, SR Guevara, RD Sánchez, M Malta, ... Applied Surface Science 254 (1), 371-374 , 2007 2007 Citations: 21
Exploring culture media diversity to produce fungal secondary metabolites and cyborg cells R Geris, VE Teles de Jesus, A Ferreira da Silva, M Malta Chemistry & Biodiversity 21 (3), e202302066 , 2024 2024 Citations: 15
Strong reduction of V4+ amount in vanadium oxide/hexadecylamine nanotubes by doping with Co2+ and Ni2+ ions: Electron paramagnetic resonance and magnetic studies ME Saleta, HE Troiani, S Ribeiro Guevara, G Ruano, RD Sánchez, ... Journal of Applied Physics 109 (9) , 2011 2011 Citations: 12
Influence of Ni doping on vanadium oxide/hexadecylamine multiwall nanotubes ME Saleta, J Curiale, HE Troiani, SR Guevara, RD Sánchez, M Malta, ... Physica B: Condensed Matter 398 (2), 333-336 , 2007 2007 Citations: 11
Medidas de tensão superficial pelo método de contagem de gotas: descrição do método e experimentos com tensoativos não-iônicos etoxilados É Teixeira Neto, MM Malta, RG Santos Química Nova 32 (1), 223-227 , 2009 2009 Citations: 10
