No abstract

No abstract

Extracts rich in bioactive compounds added to edible films have allowed the development of active packaging that increases the shelf life of food. However, it is necessary to search for solvents that are nontoxic and not harmful to the environment, with natural deep eutectic solvents (NADES) being an attractive and easily synthesized alternative. This research aimed to design NADES by lyophilization to be used in the extraction of anthocyanins from the Chilean Luma chequen (Molina) A. Gray berry, and subsequently adding them to the matrix of edible ƙ-carrageenan films. For this purpose, ultrasound-assisted extraction (UAE) was used and the anthocyanin content was evaluated with the pH differential method. The antioxidant capacity of extracts was determined by DPPH assay and the antibacterial capacity by diffusion agar tests. The results obtained indicate that the designed NADES are efficient at extracting anthocyanins, reaching concentrations between 81.1 and 327.6 mg eq cyanidin 3-glucoside/100 g dw of L. chequen (Molina) A. Gray. The extracts reached inhibition diameters between 5 and 34 mm against Escherichia coli, Staphylococcus aureus, and Salmonella typhi strains. Once the extracts were incorporated into ƙ-carrageenan films, active edible films with antioxidant and antibacterial capacities were obtained.

El objetivo de esta investigación fue estimar la vida útil de la uchuva por efecto de la aplicación de un recubrimiento a base de quitosano y áloe vera utilizando el método de aspersión. La Norma Técnica Colombiana (NTC 4580) se empleó para comparar las características físicas de las uchuvas, utilizando como indicadores de deterioro, pérdida de peso, carotenoides totales e índice de color. Las muestras evaluadas se mantuvieron a dos condiciones de almacenamiento; bajo refrigeración (4 °C) y a temperatura ambiente de la ciudad de Cali (28 °C), durante un periodo de 21 y 6 días, respectivamente. Cuatro uestreos se realizaron para cada temperatura y los resultados obtenidos se utilizaron para definir la cinética de deterioro. La cinética fue de orden cero, siendo la pérdida de peso el indicador que limitó el tiempo de vida útil. Las variables como pH, acidez e índice de madurez no mostraron diferencia significativa a un nivel de significancia p < 0,05. Finalmente, el modelamiento cinético para la pérdida de peso presentó un incremento de 1 día para las muestras almacenadas a temperatura ambiente y de 2 días para las muestras refrigeradas a 4 °C.

Honeybee pollen (HBP) is a mixture of floral pollen collected by honeybees near the hive. It is characterized by a composition rich in phenolic compounds, carotenoids and vitamins that act as free radicals scavengers, conferring antioxidant and antibacterial capacity to the matrix. These bioactive properties are related to the botanical origin of the honeybee pollen. Honeybee pollen samples were collected from different geographical locations in central Chile, and their total carotenoid content, polyphenols profile by HPLC/MS/MS, DPPH radical scavenging capacity, and antimicrobial capacity against S. pyogenes, E. coli, S. aureus, and P. auriginosa strains were evaluated. Our results showed a good carotenoids content and polyphenols composition, while antioxidant capacity presented values between 0 -95 % for the scavenging effect related to the botanical origin of the samples. Inhibition diameter for the different strains presented less variability among the samples, Furthermore, binary mixtures representing the two most abundant species in each HBP were prepared to assess the synergy effect of the floral pollen (FP) present in the samples. Data shows an antagonist effect was observed when assessing the carotenoid content, and a synergy effect often presents for antimicrobial and antioxidant capacity for bee pollen samples. The bioactive capacities of the honeybee pollen and their synergy effect could apply to develop new functional ingredients for the food industry.

The objective of this study was to evaluate the effect of ciprofibrate on serum triglyceride concentrations in canine patients. A sample size of 21 canines was study, that had a diagnosis of familial dyslipidemia, and was established with triglyceride levels above 500mg/dl, treatment with ciprofibrate was evaluated at 2 months. The analysis of the variation in triglyceride levels was performed using the non-parametric Wilcoxon matched-pairs signed-rank test. The Wilcoxon test revealed that the triglyceride concentration decreased significantly after two months of treatment with ciprofibrate; from 621 (512 to 1046)mg/dL to 136 (67 to 215)mg/dL (p <0.0001). The difference in medians was -482.0md/dL with a 97.3% confidence interval of -579.0 to -443.0mg/dL. It was concluded that the use of drugs such as ciprofibrate in the treatment of patients with familial hiperlipidemia, had a significant decrease in serum triglyceride concentrations, without generating adverse reactions in this study.