Browsing by Author "Velásquez, Patricia"

Now showing 1 - 7 of 7
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    Bioactivities of phenolic blend extracts from Chilean honey and bee pollen
    (2019) Velásquez, Patricia; Montenegro Rizzardini, Gloria; Giordano Villatoro, Ady; Retamal, M.; Valenzuela, L. M.
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    Combinación de extractos de notro (Embothrium coccineum) y maqui (Aristotelia chilensis) con capacidad antibacteriana, composiciones y uso (Chile, concesión n° 68427)
    Giordano, Ady; Montenegro Rizzardini, Gloria Del Carmen; Ojeda Flores, Camila Fernanda; Velásquez, Patricia
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    Combined antioxidant capacity of Chilean bee hive products using mixture design methodology
    (2022) Velásquez, Patricia; Giordano, A.; Valenzuela Roediger, Loreto Margarita; Montenegro, G.
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    Floral Pollen Bioactive Properties and Their Synergy in Honeybee Pollen
    (2023) Velásquez, Patricia; Muñoz-Carvajal, Eduardo; Grimau, Lissette; Bustos, Daniela; Montenegro, Gloria; Giordano, AdyVelásquez, Patricia; Muñoz-Carvajal, Eduardo; Grimau, Lissette; Bustos, Daniela; Montenegro, Gloria; Giordano, Ady
    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.
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    K-carrageenan edible films for beef: Honey and bee pollen phenolic compounds improve their antioxidant capacity
    (2022) Velásquez, Patricia; Montenegro, G.; Valenzuela Roediger, Loreto Margarita; Giordano, A.; Cabrera-Barjas, G.; Martin-Belloso, O.
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    Ultrasound-Assisted Extraction of Anthocyanins Using Natural Deep Eutectic Solvents and Their Incorporation in Edible Films
    (2021) Velásquez, Patricia; Bustos, Daniela; Montenegro Rizzardini, Gloria; Giordano, Ady
    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.
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