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fermentation process » termination process (Expander búsqueda), implementation process (Expander búsqueda), creation process (Expander búsqueda)
two fermentation » _ fermentation (Expander búsqueda), pre fermentation (Expander búsqueda), two termination (Expander búsqueda)
1
tesis de grado
Publicado 2025
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En Perú, uno de los mayores problemas es la gestión del agua: más del 50% de la población costera depende solo del 2% del abastecimiento disponible. Esta escasez provoca la pérdida de miles de hectáreas agrícolas por falta de riego. Paralelamente, el 45% del lactosuero total producido, subproducto de la industria quesera, se desecha, ocasionando contaminación de suelos y ríos. Como alternativa, se propone aplicar hidrogeles biodegradables en suelos agrícolas para disminuir el estrés hídrico durante periodos de sequía. La tesis plantea el diseño de un proceso para producir hidrogeles de almidón reticulados con ácido cítrico obtenido por fermentación sumergida por lotes de lactosuero con Aspergillus niger. El ácido cítrico se recupera mediante precipitación química con hidróxido de calcio y ácido sulfúrico, seguido de la síntesis del hidrogel de almidón. Se defin...
2
tesis de grado
Publicado 2025
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Desde la invención de las máquinas despulpadoras de café, estas se han convertido en una herramienta esencial en las industrias cafetaleras por sus beneficios, como el aumento de la producción y la reducción de la carga laboral. Sin embargo, la calidad del despulpado no ha sido suficientemente mejorada con el tiempo. La máquina implementada en este proyecto aborda cuatro etapas cruciales del procesamiento del café: control de flujo de ingreso, tamizado pre-despulpado, despulpado y almacenamiento y fermentación. El proyecto se divide en estas etapas, detalladas en el documento. Además, se utiliza un sistema de control con un tablero, un PLC Coolmay y una pantalla HMI para optimizar el manejo y la visualización del proceso. Tras las pruebas, la máquina demostró una producción de 128 kg/h con una eficiencia del 92% en granos correctamente despulpados frente a los dañados. La o...
3
artículo
Publicado 2001
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Vinegar has been elaborated from apple juice by inmersed fermentation at room temperature. The process was developed in two stages, firstly, the alcoholic termentation was carried out using Saccharomyces Cerevísíae yeast, Ellipsoideus variety. Secondly, an acetic fermentation was carried out using acetobacter. The global yield of the process, based on row material usage was around 52%. The product obtained has an acidity of 6,8% in acetic acid and fulfill the market requirements.
4
artículo
Publicado 2001
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Vinegar has been elaborated from apple juice by inmersed fermentation at room temperature. The process was developed in two stages, firstly, the alcoholic termentation was carried out using Saccharomyces Cerevísíae yeast, Ellipsoideus variety. Secondly, an acetic fermentation was carried out using acetobacter. The global yield of the process, based on row material usage was around 52%. The product obtained has an acidity of 6,8% in acetic acid and fulfill the market requirements.
5
tesis de maestría
The thesis has two purposes: The first one is to build a mathematical model that better approximates (with respect to the mathematical model in [2]) to the behaviour of the wine fermentation process with the addition of certain amount of nitrogen at some instant of time, based in [2]. This mathematical model is described by mean ordinary differential equations including some parameters which will be identified solving some optimization problems. The second purpose of the thesis is to study the improved model but introducing some control variables in order to stabilize in an appropriated sense the corresponding dynamical system of the new model. This is a kind of MIMO nonlinear system control problems and will be solved using the tools in [6].La tesis tiene dos objetivos: El primero es construir un modelo matemático que aproxime mejor (con respecto al modelo matemático en “Modeling th...
6
artículo
Publicado 2024
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In local cup chocolate production, the influence of cocoa varieties and fermentation conditions on its sensory characteristics are overlooked. The objective of the study was to sensorially evaluate chocolate made from two varieties and three clones of cocoa (Theobroma cacao L.) fermented for 5, 6, 7 and 8 days. Brix degrees and pH were recorded. Sensory evaluation was carried out with a panel of 10 judges. The research was experimental. Friedman's test and its multiple comparisons test were used. The maximum fermentation temperature reached was 51°C, decreasing to 38°C towards the end of the process. Both pH and initial brix degrees decreased from 4.6 to 4.15 and from 11 to 9.6, respectively. Differences were observed in the cocoa flavor and acidity attributes of Criollo cup chocolate at different fermentation periods. The 5-day fermentation was the one with the highest total score, f...
7
artículo
Publicado 2007
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In this comparative study the effect of the temperature was evaluated in the fermentation and production of biomass coming from the microbiote of the grain of kéfir using whole milk as sustrate. Inocule was used at 5% of concentration and it was allowed to ferment for 4 cyc1es of fermentation at reason of 24 hours per cyc1e for being the results evaluated later at two given temperatures: constant at 24 ºC and variable, between 19 and 26 ºc. The evaluation revealed that there was not a significant difference between constant and variable temperatures of fermentation concerning to the weight, that is to say concerning to the yield in biomass, although there was a difference respect to grains of kéfir consistency. The results demonstrated that the grains of kéfir obtained at variable temperature of fermenta non, it means at ambient temperature between 19 and 26 ºC, they turned out to ...
8
artículo
Publicado 2007
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In this comparative study the effect of the temperature was evaluated in the fermentation and production of biomass coming from the microbiote of the grain of kéfir using whole milk as sustrate. Inocule was used at 5% of concentration and it was allowed to ferment for 4 cyc1es of fermentation at reason of 24 hours per cyc1e for being the results evaluated later at two given temperatures: constant at 24 ºC and variable, between 19 and 26 ºc. The evaluation revealed that there was not a significant difference between constant and variable temperatures of fermentation concerning to the weight, that is to say concerning to the yield in biomass, although there was a difference respect to grains of kéfir consistency. The results demonstrated that the grains of kéfir obtained at variable temperature of fermenta non, it means at ambient temperature between 19 and 26 ºC, they turned out to ...
9
artículo
Publicado 2008
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El objetivo del presente trabajo es el de conocer la composición de las fracciones de los destilados del mosto para la producción de pisco, de dos de las principales variedades de uva para su fabricación: Torontel y Quebranta. El análisis se realizó por el método de cromatografía de gases siguiendo la Norma Técnica Peruana para el análisis de pisco. Se analizaron 24 fracciones de destilado obtenidas de dos mostos de uva torontel y quebranta, obtenidos por fermentación natural.El mosto de uva quebranta presenta una mayor concentración de alcoholes superiores que el mosto de torontel, pero menor cantidad de ésteres que esta última. Los análisis para las muestras de ambas destilaciones presentan una disminución en la concentración (expresado en mg de compuesto/100 ml de alcohol anhidro) de ésteres y alcoholes superiores conforme transcurre el proceso de destilación, mientr...
10
artículo
Publicado 2008
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The purpose of this study is to know the composition of the fractions of distillates wort for the production of Pisco, two of the main grape varieties for their manufacture: Torontel and broken. The analysis was performed by the method of gas chromatography to follow the standard technique for the analysis of Peruvian Pisco. We analyzed 24 of distillate fractions obtained from two grape must Torontel and shakes, obtained by natural fermentation.The grape shakes presents a greater concentration of higher alcohols that must of torontel, but lesser amount of esters that the latter. The analysis on samples from both distillations, show a decrease in the concentration of higher alcohols and esters passes under the process of distillation, while the concentrations of acetaldehyde and methanol remained virtually constant. Considering the total volume of each fraction analyzed, all components di...
11
artículo
Publicado 2018
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This study is part of research developed in the area of Food Science, Department of Analytical Chemistry and Food, University of Vigo Ourense Campus, Spain.; whose ultimate goal is to occurring fermented beverages with probiotic properties with kefir grains juice of red and white grapes would thus not valuing vinificables grapes with low commercial value or direct consumption. And obtaining healthy drinks combining ink effects mainly polyphenol grape character with antioxidant kefir and functional benefits. Kinetics main fermentation process cash studied, the effect of change on the fermentation substrate and microbial populations analyzed kefir. The procedure was carried out as follows: the pellet was activated, conducted a sequence of four successive crops. In each one the juice grain was incubated of nonsterile red grape during 24 h. The grain separated and juice fermented by fr...
12
tesis de grado
Publicado 2004
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Our research principal aim is to produce red dry wine using dry active yeast Saccharomyces cerevisiae r.f. cerevisae, cultivated in unfermented juice (must) of grapes called "Borgoña Negra" (Vitis labrusca), which is the only variety of grapes cultivated in the San Martin region, PERU, South America. In our experiment research we used unfermented juice of the mentioned grapes to level of 20ºBrix, 23ºBrix and 26ºBrix of sugar concer:ttration which was obtained adding granulated white sugar. During the fermentation process we checked the "yeast" at different temperature levels of 20º C, 25ºC and environment temperature, also, during 30 days. At the beginning, we evaluated nine treatments, which belonged to "musts" of various soluble solid percentages, in relation with the temperatures we have already mentioned. We have chosen the best treatments by using "surface methodology answers"...
13
tesis de grado
Publicado 2016
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Universidad Nacional Agraria La Molina. Facultad de Industrias Alimentarias. Departamento Académico de Tecnología de Alimentos y Productos Agropecuarios
14
tesis de grado
Publicado 2023
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Universidad Nacional Agraria La Molina. Facultad de Industrias Alimentarias. Departamento Académico de Tecnología de Alimentos y Productos Agropecuarios
15
tesis de grado
Publicado 2019
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El presente trabajo de investigación tuvo como objetivo contribuir en la mejora del proceso de fermentación sobre la calidad del grano de cacao. La masa de granos de cacao planteadas en la investigación fue de 150 y 500 kilogramos. El tipo de cajón que se utilizó como aislamiento térmico fue el poliestireno expandido- EPS. Las almendras de cacao se recepcionaron de los agricultores socios de la Cooperativa Agraria Allima Cacao Ltda. y fueron fermentados en cajones de madera tornillo de dos volúmenes de masa (150 y 500 kilogramos) con aislamiento y sin aislamiento térmico durante siete días; se evaluaron parámetros químicos (pH y acidez) en la testa y el cotiledón del grano en todo el proceso de fermentación cada 12 horas. Los procesos de secado de los granos fueron de 6 días en donde al finalizar el proceso se evaluaron el porcentaje de fermentación. La evaluación sensori...
16
tesis de grado
Publicado 2018
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Universidad Nacional Agraria La Molina. Facultad de Ciencias. Departamento Académico de Ingeniería Ambiental, Física y Meteorología
17
tesis de grado
Publicado 2023
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Universidad Nacional Agraria La Molina. Facultad de Ciencias. Departamento Académico de Biología
18
tesis de maestría
The thesis has two purposes: The first one is to build a mathematical model that better approximates (with respect to the mathematical model in [2]) to the behaviour of the wine fermentation process with the addition of certain amount of nitrogen at some instant of time, based in [2]. This mathematical model is described by mean ordinary differential equations including some parameters which will be identified solving some optimization problems. The second purpose of the thesis is to study the improved model but introducing some control variables in order to stabilize in an appropriated sense the corresponding dynamical system of the new model. This is a kind of MIMO nonlinear system control problems and will be solved using the tools in [6].
19
tesis doctoral
Publicado 2025
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Universidad Nacional Agraria La Molina. Escuela de Posgrado. Doctorado en Ingeniería y Ciencias Ambientales
20
artículo
Publicado 2020
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It was isolated bacteria strains from three different types of samples: fresh water, in situ baits and ex situ enrichment. Serial dilutions were prepared and culture was carried at 50 °C using a Basal-Saline medium. Isolated strains were screened for endoglucanase and xylanase activities with qualitative (Congo Red) and quantitative (DNS) methods. Molecular 16S rDNA sequencing analysis was performed for taxonomic identification. It was isolated 31 strains of which 14 showed hydrolytic activities and belonged to Bacillus subtilis and Bacillus licheniformis species. Moreover, the strain B. subtilis DCH4 showed the highest endoglucanase activity at 45°C and pH 5, and xylanase activity at 55°C and pH 6. Then, DCH4 was cultivated by submerged fermentation with two different media supplemented with sugar cane bagasse, wheat straw, or quinoa stalk to evaluate its saccharification capability....
