Abstract
Posidonia oceanica waste biomass has been valorised to produce extracts by means of different methodologies and their bioactive properties have been evaluated. Water-based extracts were produced using ultrasound-assisted and hot water methods and classified according to their ethanol-affinity (E1: ethanol soluble; E2: non-soluble). Moreover, a conventional protocol with organic solvents was applied, yielding E3 extracts. Compositional and structural characterization confirmed that while E1 and E3 extracts were mainly composed of minerals and lipids, respectively, E2 extracts were a mixture of minerals, proteins and carbohydrates. All the extracts showed remarkably high antioxidant capacity, which was not only related to phenolic compounds but also to the presence of proteins and polysaccharides. All E2 and E3 extracts inhibited the growth of several foodborne fungi, while only E3 extracts decreased substantially the infectivity of feline calicivirus and murine norovirus. These results show the potential of P. oceanica waste biomass for the production of bioactive extracts.
Highlights
Bioactive compounds with antioxidant and antimicrobial activity have found applications in a broad range of areas, like biomedicine or food science, and prospection of new biomass resources to obtain extracts with these functional properties is a topic of great interest [1,2]
For E1 US, 9.3 ± 2.8% for E1 H2 O, 2.1 ± 0.1% for E2 US and 3.0 ± 0.3% for E2 H2 O. These results were very similar to those obtained by applying ultrasound and hot water extraction techniques to raw biomass from Lentinus edodes [14]
Water-soluble extracts from Posidonia oceanica waste biomass have been produced by means of the conventional organic solvent-based extraction method, as well as alternative greener methods based on heating and ultrasound-assisted methodologies from aqueous suspensions
Summary
Bioactive compounds with antioxidant and antimicrobial activity have found applications in a broad range of areas, like biomedicine or food science, and prospection of new biomass resources to obtain extracts with these functional properties is a topic of great interest [1,2]. In the food science area, certain microorganisms can negatively affect the quality, safety and shelf-life of food products. Oxidative processes can have an impact on food quality promoting, for instance, rancidity. These oxidative processes are known to affect human health due to free. Mar. Drugs 2019, 17, 409; doi:10.3390/md17070409 www.mdpi.com/journal/marinedrugs. Mar. Drugs 2019, 17, 409 radical formation leading to changes in protective enzymes, membrane lipids or even DNA; a fact which has been correlated to the development of several diseases
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