Examinando por Materia "Chromatography, Gas"

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Acceso abierto
Actividad antioxidante y efecto antibacteriano del aceite esencial de cáscaras de Citrus sinensis variedad Valencia Late
(Universidad Privada Norbert Wiener, 2021-06-09) Luque Lipa, Miguel; Marquez Vega, Rosalinda; Ramos Jaco, Antonio Guillermo
The present research work aimed to evaluate the antioxidant activity and antibacterial effect of the essential oil of Citrus sinensis peels variety Valencia Late. The extraction of the essential oil was carried out by steam distillation. The antibacterial effect was evaluated against the strains of Staphylococcus aureus ATCC 25923 and Escherichia coli ATCC 12228 following the agar diffusion method and the antioxidant activity was determined by the DPPH radical method (2,2-diphenyl-1-picrylhydrazyl). It is a quasi-experimental and quantitative research work. For the results in the antibacterial effect, a nonparametric Kruskal Wallis test was used. Regarding the antioxidant activity in the essential oil of Citrus sinensis peels variety Valencia Late, the IC50 (minimum concentration necessary to inhibit 50% of DPPH) was determined by a linear regression adjustment. The results were illustrated using bar charts and box plots. It was concluded that the essential oil of Citrus sinensis variety Valencia Late exhibits antibacterial effects against the two strains tested and antioxidant activity against the DPPH radical.
Acceso abierto
Determinación de la graduación de etanol en vinos tintos nacionales que se expenden el mercado Unicachi del distrito de Comas – Lima, periodo diciembre 2016–marzo 2017
(Universidad Privada Norbert Wiener, 2017) Cardenas Rivera, Nataly Maria; Melendez Ruiz de la Vega, Leslie Roxana; Hernández Aguilar, Manuel Gregorio
Alcoholic beverages are produced by fermentation and/or distillation processes, reaching different alcoholic strengths ranging from an average of 5% to 50%. Among these is wine, with various types such as red, burgundy, and white, mainly obtained from grapes, which are highly consumed, especially during festivities, meetings, and celebrations. Wines have an alcoholic strength that fluctuates between 10% and 20% v/v, but this can be adulterated or counterfeited by merchants to obtain greater profits. The objective of this research was to determine the alcoholic strength present in the collected national red wines and verify if these strengths correspond to the labels, as well as if they are within the range specified by the Peruvian Technical Standard (NTP) N° 212.014:2011. For the study, 30 samples of red wine were analyzed. These were acquired from various stalls at the Unicachi market in the Comas district and subsequently analyzed using a Gas Chromatograph with Flame Ionization Detector (GC-FID). Results reported alcoholic strengths with a minimum value of 1.03% v/v and a maximum value of 8.86% v/v from a total of 30 national red wines of different brands. These findings confirm our hypothesis, which states that the national red wines sold in the Unicachi market do not contain the alcoholic strength consigned on their label, as they present a lower alcohol degree. These results do not comply with the Peruvian Technical Standard (NTP) N° 212.014:2011, which indicates that wine must have a minimum alcoholic strength of 10% v/v.
Acceso abierto
Determinación de trazas de óxido de etileno en suturas quirúrgicas fabricadas por dos laboratorios de dispositivos médicos de fabricación nacional, agosto 2018
(Universidad Privada Norbert Wiener, 2018-12-04) Flores Arias, Noelia Angela; Silva Florián, Rosa Esther; Lizano Gutiérrez, Jesús Víctor
The present research aimed to determine the concentration of ethylene oxide residues or traces present in nylon surgical sutures. The sample was acquired in August 2018 from Farmacia Universal in downtown Lima; however, the sutures had been manufactured in July 2015 and January–February 2018. A total of 24 nylon surgical suture samples were obtained, with all necessary safety measures taken for their transport to the LABICER laboratory for subsequent analysis using the gas chromatography method with flame ionization detector (GC-FID). The results showed that 100% of the nylon surgical suture samples manufactured by the Peruvian laboratories Tagumedica S.A. and Unilene S.A.C. did not exceed the Maximum Residual Limit established by the FDA, which is 250 ppm per small device (<10 grams).