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Authors = Rosa María Jiménez-Amezcua

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17 pages, 5563 KiB  
Article
Evaluation of the Fungitoxic Effect of Extracts from the Bark of Quercus laeta Liebm, the Cob of Zea mays and the Leaves of Agave tequilana Weber Blue Variety against Trametes versicolor L. Ex Fr
by Alberto Gálvez-Martínez, Rosa María Jiménez-Amezcua, José Anzaldo-Hernández, María Guadalupe Lomelí-Ramírez, José Antonio Silva-Guzmán, José Guillermo Torres-Rendón and Salvador García-Enriquez
Forests 2024, 15(7), 1204; https://doi.org/10.3390/f15071204 - 11 Jul 2024
Viewed by 1337
Abstract
Wood products used in outdoor applications can be degraded by xylophage organisms. For this reason, such products require treatments based on biocides in order to delay their service life. This brings troubles of its own due to the inherent toxicity of these treatments [...] Read more.
Wood products used in outdoor applications can be degraded by xylophage organisms. For this reason, such products require treatments based on biocides in order to delay their service life. This brings troubles of its own due to the inherent toxicity of these treatments towards humans and the environment. Therefore, it is imperative to find less-toxic natural preservatives. In this context, this work deals with the evaluation of the fungitoxic effect of raw extracts obtained from three types of agroindustrial waste materials: bark of Quercus laeta spp., the cob of Zea mays, and the leaves of Agave tequilana Weber Blue variety. Extracts were incorporated into the test wood Alnus acuminata (Aile wood) via a full-cell process. Bark extracts provided excellent protection against the attack of Trametes versicolor (L. ex. Fr.) Pilát, improving the decay resistance of Aile wood from being nonresistant to resistant. Also, bark extracts from Q. laeta showed less leaching than the other extracts. Full article
(This article belongs to the Special Issue Wood Durability and Protection)
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6 pages, 722 KiB  
Proceeding Paper
Nanocellulose and Its Application in the Food Industry
by Talita Szlapak Franco, Graciela Boltzon de Muniz, María Guadalupe Lomelí-Ramírez, Belkis Sulbarán Rangel, Rosa María Jiménez-Amezcua, Eduardo Mendizábal Mijares, Salvador García-Enríquez and Maite Rentería-Urquiza
Biol. Life Sci. Forum 2023, 28(1), 2; https://doi.org/10.3390/blsf2023028002 - 6 Nov 2023
Cited by 2 | Viewed by 3928
Abstract
This work presents a review related to the obtainment of cellulose from different structures in agro-industrial residues, both for application in the food industry and for the reinforcement of other materials. Cellulose nanofibers are produced by the heart of palm (Bactris gasipaes [...] Read more.
This work presents a review related to the obtainment of cellulose from different structures in agro-industrial residues, both for application in the food industry and for the reinforcement of other materials. Cellulose nanofibers are produced by the heart of palm (Bactris gasipaes) industry in Brazil and are used as a stabilizer in avocado oil emulsions; conversely, cellulose nanocrystals are produced in waste from the tequila industry (Agave tequilana Weber var. Azul) in Jalisco, Mexico, and are used for reinforcement applications. Full article
(This article belongs to the Proceedings of The 1st International Conference of the Red CYTED ENVABIO100 “Obtaining 100% Natural Biodegradable Films for the Food Industry”)
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14 pages, 4703 KiB  
Article
Physicomechanical and Morphological Characterization of Multi-Structured Potassium-Acrylate-Based Hydrogels
by José Luis Gradilla-Orozco, José Ángel Hernández-Jiménez, Oscar Robles-Vásquez, Jorge Alberto Cortes-Ortega, Maite Renteria-Urquiza, María Guadalupe Lomelí-Ramírez, José Guillermo Torres Rendón, Rosa María Jiménez-Amezcua and Salvador García-Enriquez
Gels 2022, 8(10), 627; https://doi.org/10.3390/gels8100627 - 1 Oct 2022
Cited by 6 | Viewed by 2891
Abstract
In this work, a photo-polymerization route was used to obtain potassium acrylate-co-acrylamide hydrogels with enhanced mechanical properties, well-defined microstructures in the dry state, and unique meso- and macrostructures in the hydrated state. The properties of the hydrogels depended on the concentration of the [...] Read more.
In this work, a photo-polymerization route was used to obtain potassium acrylate-co-acrylamide hydrogels with enhanced mechanical properties, well-defined microstructures in the dry state, and unique meso- and macrostructures in the hydrated state. The properties of the hydrogels depended on the concentration of the crosslinking agent. Mechanical properties, swelling capacity, and morphology were analyzed, showing a well-defined transition at a critical concentration of the crosslinker. In terms of morphology, shape-evolving surface patterns appeared at different scales during swelling. These surface structures had a noticeable influence on the mechanical properties. Hydrogels with structures exhibited better mechanical properties compared to unstructured hydrogels. The critical crosslinking concentration reported in this work (using glycerol diacrylate) is a reference point for the future preparation of multistructured acrylic hydrogel with enhanced properties. Full article
(This article belongs to the Special Issue Advances in Hydrogels)
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14 pages, 5443 KiB  
Article
Antifungal Activity of Datura stramonium L. Extractives against Xylophagous Fungi
by Jessica Esmeralda Vega-Ceja, Rosa María Jiménez-Amezcua, José Anzaldo-Hernández, José Antonio Silva-Guzmán, José Guillermo Torres-Rendón, María Guadalupe Lomelí-Ramírez and Salvador García-Enriquez
Forests 2022, 13(8), 1222; https://doi.org/10.3390/f13081222 - 2 Aug 2022
Cited by 5 | Viewed by 2980
Abstract
Some plants have great resistance against herbivores, invertebrates, insects, bacteria, and fungi. This resistance is mostly present in plants containing alkaloids, which are the substances responsible for giving them defensive properties. The genus Datura contains tropane alkaloids and all plants from this genus [...] Read more.
Some plants have great resistance against herbivores, invertebrates, insects, bacteria, and fungi. This resistance is mostly present in plants containing alkaloids, which are the substances responsible for giving them defensive properties. The genus Datura contains tropane alkaloids and all plants from this genus have defensive properties. In this work, we report the toxic effect against fungi of Datura stramonium extracts, obtained by the Petri dish method. The extraction solvents were water, ethanol, 2-propanol, n-butanol, propanone, butanone, 3-methyl-2-pentanone, dichloromethane, xylene, and toluene. The test fungi were Trametes versicolor (L. ex. Fr) Pilát and Rhodonia placenta (Fr.) Niemelä, K.H.Larss. & Schigel. It was found that water, butanone, and toluene extracts promoted mycelial growth, xylene extracts neither inhibited nor promoted mycelial growth, while the other extracts slightly inhibited the growth of these fungi. Full article
(This article belongs to the Special Issue Preservation, Protection, and Modification of Wood and Wood Byproducts)
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14 pages, 1750 KiB  
Article
Utilization of Wood Flour from White Oak Branches as Reinforcement in a Polypropylene Matrix: Physical and Mechanical Characterization
by José Angel Hernández-Jiménez, Rosa María Jiménez-Amezcua, María Guadalupe Lomelí-Ramírez, José Antonio Silva-Guzmán, José Guillermo Torres-Rendón and Salvador García-Enriquez
J. Compos. Sci. 2022, 6(7), 184; https://doi.org/10.3390/jcs6070184 - 22 Jun 2022
Cited by 10 | Viewed by 2612
Abstract
Compared to other fibrous materials, plant fibers can act as a reinforcement in plastics due to their relatively high strength and rigidity, low cost, low density, biodegradability, and renewability. In this context, this study examines the effect of the particle size and content [...] Read more.
Compared to other fibrous materials, plant fibers can act as a reinforcement in plastics due to their relatively high strength and rigidity, low cost, low density, biodegradability, and renewability. In this context, this study examines the effect of the particle size and content of white oak wood flour (Quercus laeta Liemb), obtained from its branches, on the properties of commercial polypropylene. In Mexico, wood from the branches of Quercus laeta Liemb is barely utilized despite its abundance and viability. The main objective of this study is to demonstrate that this waste material can be exploited to prepare useful materials, in this case composites with competitive properties. Tensile and flexural tests, as well as impact strength and melt flow index were evaluated. In addition, density and water absorption capacity were also tested. Results showed that the water absorption increased with the incorporation of wood particles. Mechanical properties were strongly influenced by particle content. A reduction in elongation and strength was observed, while Young’s modulus and flexural modulus increased with the incorporation of wood particles. Impact strength increased with particle size and particle content. Full article
(This article belongs to the Special Issue From Waste to Advance Composite Materials)
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