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1
artículo
Publicado 2022
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“Cotton is the most widely used natural fiber for textiles; however, the capacity of cotton fibers to absorb large amounts of moisture, retain oxygen, and have a high specific surface area makes them more prone to microbial contamination, becoming an appropriate medium for the growth of bacteria and fungi. In recent years, the incorporation of silver nanoparticles in textile products has been widely used due to their broad-spectrum antibacterial activity and low toxicity towards mammalian cells. The aim of the current study is to continue the assessment of our developed nanocomposite and evaluate the antibacterial and antifungal activity of the nanocomposite based on silver nanoparticles and carboxymethyl chitosan (AgNPs-CMC) against Escherichia coli, Staphylococcus aureus, and Candida albicans, evaluated by the well diffusion method. The antibacterial activity against E. coli and S. a...
2
artículo
Publicado 2022
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Cotton is the most widely used natural fiber for textiles; however, the capacity of cotton fibers to absorb large amounts of moisture, retain oxygen, and have a high specific surface area makes them more prone to microbial contamination, becoming an appropriate medium for the growth of bacteria and fungi. In recent years, the incorporation of silver nanoparticles in textile products has been widely used due to their broad-spectrum antibacterial activity and low toxicity towards mammalian cells. The aim of the current study is to continue the assessment of our developed nanocomposite and evaluate the antibacterial and antifungal activity of the nanocomposite based on silver nanoparticles and carboxymethyl chitosan (AgNPs-CMC) against Escherichia coli, Staphylococcus aureus, and Candida albicans, evaluated by the well diffusion method. The antibacterial activity against E. coli and S. aure...
3
artículo
Publicado 2025
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Purple corn (Zea mays L.) is a superfood native to Peru, highly regarded for its functional properties and commonly used in the preparation of traditional beverages and desserts, such as chicha morada and mazamorra morada. Following processing, the corn cobs remaining as a byproduct retain significant amounts of bioactive compounds with potential for utilization. This study proposes their use as a primary component in the production of teas. To ensure product safety, the moisture content, total ash, and counts of enterobacteria and aflatoxins in the raw materials were first evaluated. Fourteen formulations were developed, varying in the proportions of corn cobs, quince, stevia, cinnamon, and cloves, as well as extraction times (5 and 10 minutes at 100 °C) with hot water. Two rapid sensory evaluation methods using consumer panels were applied sequentially: Flash Profile (FP) and Check-...
4
artículo
Publicado 2022
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Cotton is the most widely used natural fiber for textiles but its innate capacity to absorb moisture, retain oxygen, and high specific surface area make it more prone to microbial contamination, becoming an appropriate medium for the growth of bacteria and fungi. In recent years, the incorporation of silver nanoparticles in textile products has been widely used due to their broad-spectrum antibacterial activity and low toxicity towards mammalian cells. The aim of the current study is to synthesize and characterize a nanocomposite based on silver nanoparticles and carboxymethyl chitosan (AgNPs-CMC), which was utilized to provide a functional finish to cotton fabric. The scanning electron microscope (SEM) to produce a scanning transmission electron microscope (STEM) image showed that the nanocomposite presents AgNPs with a 5–20 nm size. The X-ray diffraction (XRD) analysis confirmed the ...
5
artículo
Publicado 2022
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Cotton is the most widely used natural fiber for textiles but its innate capacity to absorb moisture, retain oxygen, and high specific surface area make it more prone to microbial contamination, becoming an appropriate medium for the growth of bacteria and fungi. In recent years, the incorporation of silver nanoparticles in textile products has been widely used due to their broad-spectrum antibacterial activity and low toxicity towards mammalian cells. The aim of the current study is to synthesize and characterize a nanocomposite based on silver nanoparticles and carboxymethyl chitosan (AgNPs-CMC), which was utilized to provide a functional finish to cotton fabric. The scanning electron microscope (SEM) to produce a scanning transmission electron microscope (STEM) image showed that the nanocomposite presents AgNPs with a 5–20 nm size. The X-ray diffraction (XRD) analysis confirmed the ...
6
artículo
Publicado 2020
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The respiratory metabolism of fruits is affected by multiple internal (product) and external (environmental) factors that often interact with each other. Among the external factors that have the greatest influence on respiration are temperature, air composition, moisture content and illumination. The aim of this paper is to elucidate the influence of environmental factors on the respiration rate of peach fruits based on transfer models obtained by dynamic regression modelling (ARIMAX). The fitted ARIMA models met the criteria of parsimony and white noise in residuals. The estimated coefficients of each model were statistically significant under the Durbin-Watson (DW), Akaike (AIC) and Schwarz (SBC) criteria. Transfer functions revealed 0.15% and 1.9% increase, and 0.001% decrease in the respiration rate of the peach fruit for each unit of change in temperature, relative humidity and illu...
7
artículo
Publicado 2020
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The respiratory metabolism of fruits is affected by multiple internal (product) and external (environmental) factors that often interact with each other. Among the external factors that have the greatest influence on respiration are temperature, air composition, moisture content and illumination. The aim of this paper is to elucidate the influence of environmental factors on the respiration rate of peach fruits based on transfer models obtained by dynamic regression modelling (ARIMAX). The fitted ARIMA models met the criteria of parsimony and white noise in residuals. The estimated coefficients of each model were statistically significant under the Durbin-Watson (DW), Akaike (AIC) and Schwarz (SBC) criteria. Transfer functions revealed 0.15% and 1.9% increase, and 0.001% decrease in the respiration rate of the peach fruit for each unit of change in temperature, relative humidity and illu...
8
artículo
Publicado 2025
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Objective: The objective of this study was to demonstrate whether a gel formulation developed with collagen extracted from fish scales is stable, functional, and safe for cosmetic applications. Material and Methods: A gel formulation derived from fish scales was developed, and physicochemical parameters (pH, viscosity, protein, lipid, carbohydrate, ash, and moisture content) were analyzed following AOAC (Association of Official Analytical Chemists) methods. Additionally, microbiological aspects (mesophilic bacteria, coliforms, molds, yeasts, and Salmonella spp.) were evaluated, and a sensory test was conducted with consumers. Results: The results showed a pH of 6.8 and a viscosity of 150 cP, which are suitable for stability. Protein content was 25%, carbohydrates reached 60.2%, and lipids were 5.5%. No Salmonella spp. was detected, and other microbiological parameters remained within per...
9
tesis de grado
Publicado 2025
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Universidad Nacional Agraria La Molina. Facultad de Industrias Alimentarias. Departamento Académico de Tecnología de Alimentos y Productos Agropecuarios
10
tesis de grado
Publicado 2021
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La amazonia peruana enfrenta un elevado porcentaje de desnutrición infantil que requiere de manera urgente desarrollar, planificar y accederse en alimentos con alto valor nutricional que brinden nutrientes complementarios a la lactancia materna. Por tanto el presente trabajo de investigación tiene el objetivo de desenvolver una compota a base de Annona muricata (guanábana), Mauritia flexuosa (aguaje), Solanum sessiliflorum (cocona) y su capacidad antioxidante y su aceptabilidad como alimento complementario; para eso, se realizó un diseño completamente experimental aleatorizado con tres formulaciones y tres tratamientos térmicos aplicando un flujograma. Los resultados mostraron que la formulación con guanábana al 70%, cocona 15% y aguaje 15%; fue el que mostró los mejores valores en las pruebas fisicoquímicas, microbiológicas y sensoriales; siendo los valores de humedad 84.62 g...
11
tesis de grado
Publicado 2006
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El aceite de los granos de Amaranthus caudatus L. “Kiwicha” (Anexo Nº1), se extrajo por el método de Soxhlet y se evaluó: la seguridad cutánea y ocular in vivo aplicando los métodos “Acute Dermal Irritation/Corrosion” (OECD 404) y “Acute Eye Irritation/Corrosion” (OECD 405) de Guidelines for Testing of Chemicals; se determinaron las propiedades físico-químicas del aceite: peso específico, índice de refracción, índice de acidez, índice de saponificación, índice de peróxido, índice de yodo. Se realizó una formulación O/W conteniendo 5% del aceite y se evaluaron las características microbiológicas de la fórmula según la USP 29; se evaluó la eficacia dermocosmética de la fórmula hasta las 24 horas con modernos equipos de Bio-ingeniería Cutánea, evaluando parámetros como: el efecto humectante empleando el Corneometer, la pérdida de agua transepidérmic...
12
tesis de maestría
Publicado 2022
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Universidad Nacional Agraria La Molina. Escuela de Posgrado. Maestría en Riego y Drenaje
13
tesis de grado
Publicado 2022
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La actual investigación se centra en evaluar y diseñar una propuesta de sistema de estabilización para defensa ribereña con gaviones del talud del Embarcadero Botafogo – Río Tambopata, provincia de Tambopata, departamento - Madre de Dios, estableciendo un sistema de gaviones el Gavión tipo colchón que contrarresta la erosión del suelo y el Gavión tipo caja que estabiliza el talud. Como estudios preliminares se tuvo la inspección in situ del talud realizando un levantamiento topográfico que nos proporcionará el perfil de la misma, para determinar las propiedades físico mecánicas del suelo del talud se auscultaron tres calicatas a lo largo de la zona de estudio ubicado entre las progresivas km 3+600m a km 3+800m del cual se realizaron los ensayos Caracterización del material (Contenido de Humedad, Análisis Granulométrico por tamizado de suelo, Límite Líquido, Límite P...
14
artículo
Measurements at the high-elevation Lamar Observatory in the Mantaro Valley (MV) in the Central Andes of Peru demonstrate a diurnal cycle of precipitation characterized by convective rainfall during the afternoon and nighttime stratiform rainfall with embedded convection. Wet season data (2016-2018) reveal long-duration (6-12 hr) shallow precipitating systems (LDPS) that produced about 17% of monsoon rainfall in 2016 and 2018 associated with El Nino and La Nina, respectively. The LPDS fraction of monsoon rainfall doubles to 35% with weekly recurrence in 2017 under El Nino Costero (coastal) conditions. LDPS occur under favorable moisture conditions dictated by the South America (SA) Low-Level Jet (SALLJ) and Cold Air Intrusions (CAIs). Backward trajectory analysis shows that precipitable water sustains >80% of seasonal precipitation and ties the LPDS to particular moisture source regions i...
15
tesis de grado
Publicado 2017
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La presente tesis se enmarca en la ciudad de Cusco, la investigación tiene por objetivo evaluar los efectos que producen el aceite requemado automotriz y la cola sintética blanca en las propiedades físico mecánicas de la madera Eucalipto Globulus con contenido de humedad seco procedente de Paucartambo – Cusco aplicada por inmersión prolongada para uso estructural. Las propiedades físico-mecánicas que se ensayaron fueron: Densidad básica, Dureza, Cizallamiento paralelo al grano, Compresión axial o paralela al grano, Compresión perpendicular y Flexión estática, para lo cual se utilizó un total de 360 probetas elaboradas de 5 árboles extraídos de la zona de Paucartambo, se utilizaron 20 probetas por ensayo dando un total de 120 probetas por tratamiento con cola sintética blanca, 120 con tratamiento de aceite requemado automotriz y 120 probetas sin tratamiento. Se utilizó ...
16
artículo
Publicado 2020
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Low-fat cheeses are characterized as having poor flavour, texture and functional properties due to the high moisture and protein content. Some strategies developed to improve these deficiencies include the use of adjunct cultures, use of fat replacers and processing techniques. The use of adjunct cultures (mainly Lactobacillus spp) can improve the functionality and flavour of low-fat cheeses. It is desirable to have cultures of low proteolytic activity, but of high peptidolytic activity (to avoid excessive acid formation and bitter flavours). The use of fat stabilizers, replacers and fat mimetics (protein and carbohydrate based) has also been used to improve the quality of low-fat cheeses. Processing techniques, such as membrane processes (ultrafiltration and microfiltration), supplementation of milk with whey proteins, direct addition of buttermilk, standardization of milk in terms of c...
17
artículo
Publicado 2020
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Low-fat cheeses are characterized as having poor flavour, texture and functional properties due to the high moisture and protein content. Some strategies developed to improve these deficiencies include the use of adjunct cultures, use of fat replacers and processing techniques. The use of adjunct cultures (mainly Lactobacillus spp) can improve the functionality and flavour of low-fat cheeses. It is desirable to have cultures of low proteolytic activity, but of high peptidolytic activity (to avoid excessive acid formation and bitter flavours). The use of fat stabilizers, replacers and fat mimetics (protein and carbohydrate based) has also been used to improve the quality of low-fat cheeses. Processing techniques, such as membrane processes (ultrafiltration and microfiltration), supplementation of milk with whey proteins, direct addition of buttermilk, standardization of milk in terms of c...
18
tesis de grado
Publicado 2016
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This thesis aims to design a method of controlling moisture in pressing for plant JADA S.A. to obtain a press cake moisture within acceptable ranges, where a relationship between humidity and screw speed press shown. In Chapter 1 Introduction of the thesis which describes the problem. problems such as high times, fluctuations in the data and maintenance costs and rework are identified. In Chapter 2 basics of the different parts that make up the design of automatic humidity control, and some important parameters to be taken into account are detailed. Chapter 3 information on various current methods of moisture control and procedures to be followed in the press is collected. Then we determine the most suitable method for controlling moisture in the press that can be implemented at the plant JADA S.A. evaluating three options, using an array of selection based on some design criteria, obtai...
19
tesis de grado
Publicado 2023
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La presente tesis se enmarca en la ciudad de Cusco, la investigación tiene por objetivo evaluar la variación de las propiedades físico - mecánicas de la madera Miza de la zona de Puerto Maldonado, en comparación con la madera Miza de las zonas de Camanti y Kosñipata según NTP E.0.10. Las propiedades físico-mecánicas que se ensayaron fueron: Contenido De Humedad, Densidad básica, Cizallamiento paralelo al grano, Compresión axial o paralela al grano, Compresión perpendicular, Flexión estática y Dureza Brinell, para lo cual se utilizó un total de 432 probetas elaboradas de 5 árboles según la NTP 251.008 de las zonas de Puerto Maldonado, Camanti y Kosñipata, siendo utilizadas para cada ensayo un total de 24 probetas por grupo de evaluación. Las dimensiones de cada probeta se realizaron de acuerdo a lo estipulado en las Normas Técnicas Peruanas, y se verifico que estuviera...
20
tesis de grado
Publicado 2023
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El presente trabajo de investigación denominado “Diseño Estructural del Pavimento de la vía entre Kilómetro 22.5 Carretera Simbal y el Anexo CPM Ciudad De Dios, Trujillo, La Libertad”, busca en breve y conciso, ser un trabajo de carácter social en beneficio de la comunidad liberteña, con el objetivo de aportar en el progreso y avance de los pobladores de la CPM Ciudad de Dios, un centro poblado que necesita, como muchos otros, una mejora de condiciones infraestructurales viales, para optar por una transitabilidad y seguridad de vehículos y de los habitantes de la zona, y así, les permita crecer no solo económicamente sino también optar por una calidad de vida más acomodada. La mejora en carreteras y vías, conlleva consigo más trabajo y oportunidades de desarrollo. Es por eso, que en esta investigación nos centramos en el diseño estructural de un pavimento flexible, en ...
