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Publication
Optimization of Extraction Conditions for Gracilaria gracilis Extracts and Their Antioxidative Stability as Part of Microfiber Food Coating Additives
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Advisor(s)
Abstract(s)
Incorporation of antioxidant agents in edible films and packages often relies in the usage of
essential oils and other concentrated hydrophobic liquids, with reliable increases in antimicrobial and
antioxidant activities of the overall composite, but with less desirable synthetic sources and extraction
methods. Hydroethanolic extracts of commercially-available red macroalgae Gracilaria gracilis were
evaluated for their antioxidant potential and phenolic content, as part of the selection of algal
biomass for the enrichment of thermoplastic film coatings. The extracts were obtained through
use of solid-liquid extractions, over which yield, DPPH radical reduction capacity, total phenolic
content, and FRAP activity assays were measured. Solid-to-liquid ratio, extraction time, and ethanol
percentages were selected as independent variables, and response surface methodology (RSM) was
then used to estimate the effect of each extraction condition on the tested bioactivities. These extracts
were electrospun into polypropylene films and the antioxidant activity of these coatings was measured.
Similar bioactivities were measured for both 100% ethanolic and aqueous extracts, revealing high
viability in the application of both for antioxidant coating purposes, though activity losses as a result
of the electrospinning process were above 60% in all cases.
Description
Keywords
Active Packaging Response Surface Methodology Rhodophyta Electrospinning Box– Behnken Design Segurança Alimentar Toxicologia dos Alimentos Composição dos Alimentos Toxicologia
Pedagogical Context
Citation
Molecules. 2020 Sep 5;25(18):4060. doi: 10.3390/molecules25184060
Publisher
MDPI