Hortensia Ortega Ortiz - Academia.edu (original) (raw)

Papers by Hortensia Ortega Ortiz

Polymer-Plastics Technology and Materials, 2018

This study presents the fabrication and characterization of cotton textile fibers coated with hyd... more This study presents the fabrication and characterization of cotton textile fibers coated with hydrogels containing silver and Graphene or Graphene Oxide nanoparticles using 1-hexyl-3-methyl-imidazolium (HMIMPF6) ionic liquid (IL) as carbon filler dispersant. Acrylic acid/Itaconic acid (AA-IA) hydrogels are synthesized by polymerizing an acrylic acid-itaconic acid aqueous (80/20 v/v) solution and mixed with 2-2-Azobis (2-methylpropionamide) diclorohydrate, and N,N´-methylenbis (acrylamide). Then silver nanoparticles are generated throughout the hydrogel networks using in situ method by incorporating the silver ions and subsequent reduction with sodium borohydride. Then a cotton textile fiber substrate was coated with this hydrogel. Finally, graphene or graphene oxide was added to the textile substrate already impregnated with hydrogel and silver nanoparticles. In order to favor the dispersion of the carbon nano-structures in the system, an IL was used. The influence of these nanocomposite hydrogels on the properties of textile fiber were investigated by infrared spectroscopy (ATR), scanning electron microscopy (SEM), inductively coupled plasma mass spectroscopy (ICP) and antibacterial tests against Staphylococcus aureus (Gram positive) and Escherichia coli (Gram negative). The effect of each and combined fillers dispersion on antimicrobial properties were determined. Cotton fibers coated with hydrogel containing silver nanoparticles and graphene showed better results when the ionic liquid was used. Graphene showed greater antimicrobial efficiency than graphene oxide. It was proved that the textiles coated with hydrogels containing these fillers had an excellent antibacterial ability and are a good option to be used for medical applications such as wounds and burns dressing.

Revista Mexicana de Ciencias Agrícolas, 2021

El uso de nanopartículas de quitosán (NPs CS) se ha vuelto una alternativa prometedora en la agri... more El uso de nanopartículas de quitosán (NPs CS) se ha vuelto una alternativa prometedora en la agricultura moderna como un inductor en la biosíntesis de metabolitos secundarios. El objetivo del presente trabajo fue evaluar el efecto de NPs CS en la calidad nutraceútica de germinados de triticale (x Triticosecale Wittmack). Dosis creciente de NPs CS: 0, 0.1, 0.2, 0.4 y 0.8 mg ml-1 se aplicaron una sola vez en la etapa de imbibición, después se dejaron en cajas Petri durante 7 días a 25 ±2 °C de temperatura. Las NPs CS no afectaron la germinación ni el peso freso de la raíz a las concentraciones probadas, y a la concentración de 0.1 mg ml-1 aumentó el peso fresco del brote hasta 83.3%. En presencia de 0.8 mg ml-1 de las NPs CS los compuestos fenólicos disminuyen un 7% y aumentan 29% los flavonoides. Los resultados confirman un efecto promotor de las NPS CS en los germinados, abriendo la posibilidad de ser utilizadas como inductores en la biosíntesis de compuestos bioactivos en germinado...

Notulae Botanicae Horti Agrobotanici Cluj-Napoca

Metal nanoparticles have many positive effects in improving crop production and productivity and ... more Metal nanoparticles have many positive effects in improving crop production and productivity and allow for increased germination and rapid crop establishment under field conditions. The metallic nanoparticles applied in this study were copper oxide nanoparticles (CuONPs) biosynthesized using orange peel (Citrus X sinensis) as a reducing agent to avoid or reduce toxicity in wheat seeds and sprouts. This study determined the effect of CuONPs on germination, radicle and plumule length, as well as the production of phytochemical compounds in wheat sprouts. The seeds were treated with suspensions of CuONPs at the following concentrations: 0, 0.5, 1, 2, 4 and 6 mg mL-1. The results indicate that the use of low doses of CuONPs (0.5 mg mL-1), improved germination, vigor, plumule and radicle length, in addition to increasing the biosynthesis of phytochemical compounds in wheat shoots. A high concentration of CuONPs (6 mg mL-1) causes inhibitory effects due to Cu accumulation and phytotoxicit...

The use of chitosan nanoparticles (NPs CS) has become a promising alternative in modern agricultu... more The use of chitosan nanoparticles (NPs CS) has become a promising alternative in modern agriculture as an inducer in the biosynthesis of secondary metabolites. The objective of this research was to evaluate the effect of NPs CS on the nutraceutical quality of triticale sprouts (x Triticosecale Wittmack). Increasing doses of NPs Cs: 0, 0.1, 0.2, 0.4 and 0.8 mg ml were applied only once at the imbibition stage, then they were left in Petri dishes for 7 days at 25 ±2 °C temperature. NPs CS did not affect germination or fresh root weight at the tested concentrations, and the concentration of 0.1 mg ml increased the fresh weight of the shoots up to 83.3%. In the presence of 0.8 mg ml of NPs CS phenolic compounds decrease by 7% and flavonoids increase by 29%. The results confirm a promoter effect of NPS CS on sprouts, opening the possibility of being used as inducers in the biosynthesis of bioactive compounds in triticale sprouts.

In the search to improve the use of natural resources and increase the yield and quality of the f... more In the search to improve the use of natural resources and increase the yield and quality of the fruits using environmentally friendly techniques, such as grafting and the use of metal nanoparticles. The objective of this research was to determine the effect of grafting combined with the application of different concentrations of selenium nanoparticles (Se NPs) encapsulated in one gram of chitosanpolyvinyl alcohol hydrogel (CS-PVA) in the productivity and production of grafted cucumber. The treatments were applied to the substrate at the time of transplantation as follows: 1, 2.5 and 5 mg of Se NPs absorbed in one gram of hydrogels of CS-PVA, CS-PVA without NPs and a control treatment, in grafted and non-grafted cucumber plants. The variables evaluated were length and diameter of the stem, fresh and dry weight of leaves, foliar area, root length, fruit length, number of fruits and yield per plant. The results showed that the application of Se NPs has a beneficial effect for plants, a...

Revista Mexicana de Ciencias Agrícolas, 2019

El jitomate es una de las hortalizas de mayor importancia a nivel mundial, por lo que, conocer ... more El jitomate es una de las hortalizas de mayor importancia a nivel mundial, por lo que, conocer el manejo en la nutrición y su interacción en el rendimiento agronómico es importante. El experimento se realizó en un invernadero de baja tecnología, de la Universidad Autónoma Agraria Antonio Narro con el objetivo de determinar el efecto suplementario en diferentes concentraciones de los microelementos Fe, Cu y Zn en el rendimiento agronómico del cultivo de jitomate. Se evaluaron tres factores que consistieron en las aplicaciones suplementarias de fertilizantes a base de Fe, Cu y Zn y dos niveles de concentración para cada caso, además del tratamiento testigo (dosis normal de la solución nutritiva Steiner). Los tratamientos fueron evaluados mediante un diseño completamente al azar con arreglo factorial 3 x 2, con 16 repeticiones por tratamiento. Las dosis bajas de Zn superaron al testigo 27.3% en la variable vitamina C, mientras que, en los sólidos solubles totales, área foliar (AF), r...

Plants, 2019

The effects of nanoparticles (NPs) on plants are contrasting; these depend on the model plant, th... more The effects of nanoparticles (NPs) on plants are contrasting; these depend on the model plant, the synthesis of the nanoparticles (concentration, size, shape), and the forms of application (foliar, substrate, seeds). For this reason, the objective of this study was to report the impact of different concentrations of selenium (Se) and copper (Cu) NPs on yield, antioxidant capacity, and quality of tomato fruit. The different concentrations of Se and Cu NPs were applied to the substrate every 15 days (five applications). The yield was determined until day 102 after the transplant. Non-enzymatic and enzymatic antioxidant compounds were determined in the leaves and fruits as well as the fruit quality at harvest. The results indicate that tomato yield was increased by up to 21% with 10 mg L−1 of Se NPs. In leaves, Se and Cu NPs increased the content of chlorophyll, vitamin C, glutathione, 2,2′-azino-bis(3-ethylbenzthiazolin-6-sulfonic acid (ABTS), superoxide dismutase (SOD), glutathione p...

Applied Sciences, 2018

Nanotechnology is a potential and emerging field with multiple applications in different areas of... more Nanotechnology is a potential and emerging field with multiple applications in different areas of study. The beneficial effects of the use of nanoparticles in agriculture have already been proven. The objective of this research was to determine if the foliar application of Cu nanoparticles (NPs) could increase the content of the bioactive compounds in tomato fruits. Our study considered four treatments with different concentrations of Cu nanoparticles (50, 125, 250, 500 mg L −1 , diameter 50 nm) applied twice during the development of the culture. The effects on the fruit quality and the contents of the antioxidant compounds were determined. The application of the Cu nanoparticles induced the production of fruits with greater firmness. Vitamin C, lycopene, and the ABTS antioxidant capacity increased compared to the Control. In addition, a decrease in the ascorbate peroxidase (APX) and glutathione peroxidase (GPX) enzymatic activity was observed, while the superoxide dismutase (SOD) and catalase (CAT) enzymes showed a significant increase. The application of Cu NPs induced a greater accumulation of bioactive compounds in tomato fruits.

Agronomy, 2018

Moringa oleifera Lam is a plant that has recently gained importance as a food because of its nutr... more Moringa oleifera Lam is a plant that has recently gained importance as a food because of its nutritional value and bioactive compound content and because practically all the organs are usable. The use of nanoparticles has appeared as an alternative to increase bioactive compounds in plants. The goal of this work was to determine if the application of copper nanoparticles would increase the content of bioactive compounds and antioxidant capacity in M. oleifera. Copper (Cu) nanoparticles were applied to the leaves at four different times throughout crop growth. The biocompounds were analyzed after the second, third, and fourth applications. The results show that application of Cu nanoparticles has a beneficial effect on the accumulation of bioactive compounds in M. oleifera leaves. In addition, the antioxidant capacity and carotenoid and chlorophyll contents in the leaves of M. oleifera increased after Cu nanoparticles application. The same effect was not observed in the fruit of M. o...

Plasma Processes and Polymers, 2014

Surface modification of copper nanoparticles (CuNPs) was performed in a radiofrequency plasma rea... more Surface modification of copper nanoparticles (CuNPs) was performed in a radiofrequency plasma reactor using acrylic acid, acrylonitrile, and methyl methacrylate monomers. Treated and untreated CuNPs were analyzed by thermogravimetrical analysis, X-ray diffraction (XRD), transmission electronic microscopy, energy dispersive X-ray spectroscopy, and Fourier transform infrared spectroscopy. The oxidation of CuNPs was assessed by XRD as a function of the plasma treatment. The antibacterial properties of plasma treated CuNPs were evaluated using Pseudomonas aeruginosa and Staphylococcus aureus. It was found that the plasma modification did not affect significantly the antibacterial properties of CuNPs, since the plasma films deposited on their surfaces were in the order of few nanometers and copper ions traveled easily through the plasma polymer to interact with the bacteria. Further, the nanocoating deposited by plasma on the CuNPs protects them against the oxidation even in solution dispersions. CuNPs coated with acrylonitrile presented a slightly lower antibacterial activity than pristine CuNPs.

Macromolecular Bioscience, 2003

Journal of Applied Polymer Science, 2011

Silver nanoparticles were deposited on the surface of the external polyamide 6 (PA6) layer of a m... more Silver nanoparticles were deposited on the surface of the external polyamide 6 (PA6) layer of a multilayer film, by spraying and ultrasound-assisted methods. The effect of silver nanoparticles content and deposition method on the mechanical and optical properties of the multilayered films as well as the efficiency of silver ion release and their fungicidal characteristics were evaluated. Itaconic (IA) and Maleic anhydride (MA) were used as adhesion promoter agents for preventing the agglomeration of the silver nanoparticles and for improving the adhesion to the PA6 polymer surface. With IA, a homogeneous distribution of silver nanoparticles on the PA6 surface was achieved. The silver ion release and biocide effect of the multilayered films was found to be dependent on the anhydride type and on the deposition method used. The multilayer films with a layer of PA6silver nanocomposite demonstrated good fungicidal activity, specifically against fungus Aspergillius niger. The observed results could be applied in the design of industrial films for packaging. V

Agrofaz, 2004

... REFERENCIA: Benavides-Mendoza, A., H. Ortega-Ortíz, A. Flores-Olivas, H. Ramírez, LO Fuentes-... more ... REFERENCIA: Benavides-Mendoza, A., H. Ortega-Ortíz, A. Flores-Olivas, H. Ramírez, LO Fuentes-Lara, J. Hernández-Dávila, V. Robledo-Torres. 2004. ... PFA es el peso fresco del pseudotallo y hojas, PFB es el peso fresco del bulbo y PFT es el peso fresco total. ...

Agriculture stands to benefit from nanotechnology in areas such as combating pests and pathogens,... more Agriculture stands to benefit from nanotechnology in areas such as combating pests and pathogens, regulating the growth and quality of crops, and developing intelligent materials and nanosensors. The objective of this paper is to provide an overview of the use of nanomaterials (NMs) and nanoparticles (NPs) in plant nutrition, highlighting their advantages and potential uses, but also reviewing their possible environmental destination and effects on ecosystems and consumers. NPs and NMs have been shown to be an attractive alternative for the manufacture of nanofertilizers (NFs), which are more effective and efficient than traditional fertilizers. Because of their impact on crop nutritional quality and stress tolerance in plants, the application of NFs is increasing. However, there are virtually no studies on the potential environmental impact of NPs and NMs when used in agriculture. These studies are necessary because NPs and NMs can be transferred to ecosystems by various pathways where they can cause toxicity to organisms, affecting the biodiversity and abundance of these ecosystems, and may ultimately even be transferred to consumers.

Revista Mexicana de Ciencias Agrícolas, 2018

El selenio es un elemento que no aparece en los listados de elementos esenciales para las plantas... more El selenio es un elemento que no aparece en los listados de elementos esenciales para las plantas y no se considera en los análisis de suelos, aguas y tejidos vegetales. Diferentes reportes indican que el Se parece asociarse con cambios en el estado redox celular. El objetivo de este estudio fue realizar aplicaciones de selenio en plantas de lechuga (Lactuca sativa) para verificar el efecto sobre el crecimiento, composición y metabolismo antioxidante. El experimento consistió en la aplicación de selenio de sodio en forma foliar en concentraciones de 0, 5 y 10 mg L-1 a los 15, 30 y 45 días después del trasplante. En las plantas se determinó el potencial de óxido-reducción, la biomasa, la concentración de minerales y la actividad catalasa foliar. La aplicación de selenio fue efectiva para modificar el potencial de óxido-reducción y elevar la actividad catalasa sin causar modificaciones en el contenido de minerales y la biomasa.

Revista de la Sociedad Química de Mexico, Sep 1, 2007

The objective of this work was the evaluation of the peroxidase and catalase level of activity in... more The objective of this work was the evaluation of the peroxidase and catalase level of activity in the protein extract of tomato in response to different treatments with chemical elicitors in different stages of tomato development. The elicitor compounds chitosan at 0.1 % (w/v), 0.1 mM salicylic acid and 0.1 mM benzoic acid were sprayed on tomato fruits without applying them in the leaves and stems of the plant. The elicitors were sprayed at one of the following stages: fruit set, fruit growth and phase 3 of fruit ripening. The activity of the antioxidant enzymes catalase and peroxidase was determined in the phase 4 of fruit ripening, being found an increase in the activity of both enzymes upon applying the elicitors in certain stages of the fruit development. The chitosan applied during fruit growing, and the salicylic acid applied during fruit set increased the activity of catalase. The peroxidase activity increased significantly upon applying chitosan during fruit set and fruit growing, finding a smaller effect for the salicylic acid. Benzoic acid did not modify the peroxidase or catalase activity.

Applied Sciences, 2020

Iodine is an essential trace nutrient for humans; its deficit can affect motor and cognitive deve... more Iodine is an essential trace nutrient for humans; its deficit can affect motor and cognitive development. Biofortifying crops with iodine is a way of promoting the adequate intake of this element. The uses of chitosan-iodine complexes for crop biofortification have not been previously studied. The present work evaluated the effects of KIO3 and KI salts, chitosan-KIO3 complex (Cs-KIO3), and chitosan-KI complex (Cs-KI) application on lettuce, with a chitosan-only treatment as a control and water as the absolute control. Each treatment involved the application of 0, 5, and 25 mg I kg−1 soil applied before transplanting or 25 mg I kg−1 soil applied as split doses of 12.5 mg kg−1, once immediately before transplanting and the second application 15 days later. Single application of Cs-KIO3 at 5 and 25 mg I kg−1 increased lettuce biomass while the split-dose application (SDA) of Cs-KI (25 mg I kg−1) led to a decrease in biomass. Maximum accumulation of iodine in lettuce was observed after ...

Horticulturae, 2022

Chitosan (CS) is a natural polymer used in agriculture as a biostimulant that has been evaluated ... more Chitosan (CS) is a natural polymer used in agriculture as a biostimulant that has been evaluated in different plant models. In this study, we evaluated the effect of the foliar application of chitosan–poly(acrylic acid) complexes (CS–PAA) and two nutrient solutions (A and B) on the parameters of growth and yield of two habanero pepper cultivars (Chichen Itza and Jaguar) in a greenhouse. Over the course of the experiment, eight foliar applications were carried out at 15-day intervals. Our results showed that foliar applications of CS–PAA complexes have a biostimulant effect on the habanero pepper crop by increasing the total dry biomass of the plant and the number of fruits of the two cultivars. Regarding nutrient solutions, the nutrient solution A increased the yield of the Chichen Itza cultivar; this effect was because it had a better balance of potassium and calcium compared to the nutrient solution B. These results provide advances on the use of CS–PAA complexes as a biostimulant...