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Browsing by Author "Giraldo Rojas, Francisco Javier"

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    Aprovechamiento del suero lácteo de una empresa del norte antioqueño mediante microorganismos eficientes
    (Área Metropolitana del Valle de Aburrá, 2012-07-17) Sánchez Sánchez, Guillermo León; Gil Garzón, Miriam Janet; Gil Garzón, Maritza Andrea; Giraldo Rojas, Francisco Javier; Millán Cardona, Leonidas de Jesús; Villada Ramírez, María Eugenia
    Introduction. Environmental pollution produced by the disposal of the serum that results from dairy industries activities is a motivation for keeping on searching for effective technologies that allow the use of this sub product. The use of efficient micro organisms usually used to transform the soil, recovery of agricultural and farming resources and water treatments, can be an alternative for a company located in the North of Antioquia, Colombia, which produces great quantities of serum per year and does not have an effective treatment for it, causing environmental problems. Objective. To transform mil serum obtained from a dairy company located in the North of Antioquia by the use of efficient micro organisms, aiming to reduce the contamination produced by this process remain. Materials and methods. Efficient micro organisms of the lactobacillus type were applied to the salty serum produced in a company from the Northern Antioquia region. The serum was treated at 94°C and the phases formed were separated with a filtration. The initial and precipitated serums were characterized by the application of physical, chemical and bromatological analysis procedures. Result analysis. Efficient micro organisms help to separate two stages: An inferior stage or precipitation represented by the 7.10%, in which a protein increase is observed (from 0.86±0.04% to 6.58±0.05% after the treatment) due to the hydrogen fixation and concentration capacity of the micro organisms. The second stage, which takes place at a liquid state, was characterized in order to determine the reduction of the value corresponding to the chemical oxygen demand (COD). A 98% measure was achieved. Conclusion. The use of efficient micro organisms is an alternative for the treatment of serum, as an organic waste from dairy industries, because it allows the recovery of a phase (7.10%) which represents a protein increase that can be used for obtaining other products for human an animal consumption. Besides, an approximately 98% COD removal rate is achieved in the liquid stage, avoiding an environmental risk.
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    Comparación de métodos de extracción de oleorresina de páprika (Capsicum annuum L.) convencionales con una tecnología amigable al medio ambiente
    (2012-05-14) Giraldo Rojas, Francisco Javier; Gil Garzón, Maritza Andrea; Alzate Tamayo, Luz María; Restrepo Duque, Ana María; Millán Cardona, Leonidas de Jesús; Ordóñez Castillo, Andrés Francisco; Restrepo Restrepo, Carlos Esteban
    Introduction. Paprika oleoresin (Capsicum annuum L.) is a product with a great added value in international markets for food and pharmaceutical industries. Objective. This research work aims to compare the performance of the paprika oleoresin extracted by the use of supercitric fluids, with carbon dioxide, and by the use of Soxhlet with three organic solvents (ethyl acetate, hexane and petroleum ether). Materials and methods. The supercitric fluids equipment operated at 280 and 350 bar and 70 °C. The sample was also characterized from the micro biological and physical chemical points of view (color according to the ASTA method). Results. The performances of supercritical fluids extracting method had significant differences (p<0.05) between the pressures evaluated. The extraction with ethytl acetate had the best performance and the highest value in degrees of ASTA color. Conclusion. In conclusion, the extraction at 350 bar and 70°C has a performance and a quality that can be compared to those of the Soxhlet conventional method, but also has environmental advantages because it does not leave organic solvent remains in the final product.