Repository logo

Browsing by Author "Murillo Bocanegra, J. Eduardo"

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Incidencia de Salmonella spp en bagre de canal (Ictalurus punctatus) en Mississippi, Estados Unidos
    (Corporación Universitaria Lasallista, 2017) Becerra Ossa, Jhennys Paola; Durango Villadiego, Alba Manuela; Silva, Juan L.; Murillo Bocanegra, J. Eduardo; Corredor Gómez, Alba Lucía
    Introduction. the channel catfish (Ictalurus punctatus) its aquaculture specie most relevant and biggest production in Mississippi. Salmonella spp, with a 67.6%, is the most frequently found pathogen in samples of the channel catfish filet. Objective. to establish in winter and spring the influence of Salmonella sp on filets previous cooling, after cooling, injected and frozen channel catfish, whole fish, equipment, entrails, cooling water and truck water of a processing plant located in Mississippi state. Materials and methods. Salmonella spp was established by the manual method of Food Safety Inspection Service. Results. the influence of Salmonella spp in fillet samples and whole fish exhibited significant differences (P<0.05) between stations, with a 1.33% in winter and 6% in spring. The tools and equipment samples, during winter showed a Salmonella spp percentage that surpassed the allowed limits, according to International Commission on Microbiological Specifications for Food-ICMSF (1986), which are n = 5; c = 0; m = 0 y M = 0. The strains and water analyzed (cooling and truck) showed values of Salmonella spp inside boundaries. Conclusion. the influence of Salmonella spp in whole fish, fillets before cooling, fillets after cooling, injected and frozen variates between winter and spring stations, presented a bigger influence of microorganism in spring.
  • Thumbnail Image
    Item
    Los líquidos iónicos como prometedores catalizadores en síntesis orgánica: una contribución a la química sostenible
    (Corporación Universitaria Lasallista, 2017) Montaño Montoya, Diego Fernando; Juaristi Cosio, Eusebio; Sepúlveda Aguirre, Jovany; Murillo Bocanegra, J. Eduardo
    Introduction. In all chemical processes, a reaction medium or solvent is required, and such organic solvents are highly volatile so they are pollutants to the atmosphere, and new methods, processes and other solvents are required to minimize the contamination, and Ionic liquids are proving to be a great alternative to such problem. Objective. Synthesize imidazole based ionic liquids with both inorganic and organic anions and evaluate their potential application as catalysts in important reactions of organic synthesis, such as asymmetric synthesis, specifically in asymmetric aldol reacion. Materials and Methods. Methyl imidazole (99%), 1-bromobutane (97%), proline (98%), KOH (97%), Ethyl acetate, ethanol, reagent grade were supplied by Sigma Chemical Co. It was used the methyl imidazol for the synthesis of the ionic liquid butyl methyl imidazole bromide, [Bmim] [Br], and the other ionic liquids were obtained by metathesis reaction from such ionic liquid, to obtain the butyl methyl imidazole hydroxy [Bmim] [OH], and the butyl methyl imidazole prolinate, [Bmim] [Pro]. These ionic liquids were used as catalysts in the asymmetric aldol reaction. Results. A classical aldol reaction, p-nitrobenzaldehyde with cyclohexanone was performed to test the ionic liquids synthesized as catalysts, and when comparing the results obtained with conventional methods, advantages were observed, such as high yields and high selectivity in less time reaction. Conclusions. Under very mild reaction conditions, it was possible to reuse up to 6 times the ionic liquid as a reaction catalyst without losing the mentioned advantages, which makes it a sustainable system.