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Research Project
DEVELOPMENT OF FOOD BIOACTIVES THROUGH THE VALORIZATION OF OLIVE OIL PRODUCTION WASTES
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Effect of gamma radiation on bioactive compounds of olive wastes
Publication . Madureira, Joana; Dias, Maria Inês; Barros, Lillian; Santos-Buelga, Celestino; Margaça, Fernanda M.A.; Ferreira, Isabel C.F.R.; Cabo Verde, Sandra
The olive pomace is an environmentally detrimental residue from olive oil industry. This residue contains large amounts of bioactive compounds, such as hydroxytyrosol and tyrosol, secoiridoid derivatives, phenolic acids and flavonoids1 that might be used by the food industry as preservatives. The aim of this work was to study the gamma radiation potential to improve the extractability of the bioactive compounds present in olive wastes. Gamma radiation is an eco-friendly technology that can be used to enhance the benefic properties of different agro-industrial products. Olive pomace samples (crude olive pomace - COP - and extracted olive pomace - EOP) were collected from UCASUL - União de Cooperativas Agrícolas do Sul, located in Alentejo region, in Portugal. The irradiation experiments were carried out at room temperature in a Co-60 semi-industrial facility (absorbed doses: 5-22 kGy; dose rate: 16 kGy/h). The characterization of the phenolic profile in the extracts of olive pomace and the identification of the radiolytic products were carried out by HPLC-DAD-ESI/MS2. The major phenolic compounds present in olive pomace extracts were hydroxytyrosol, hydroxytyrosol-1-β-glucoside, tyrosol, syringic acid and luteolin-7-O-rutinoside. Caffeic acid, vanillin, verbascoside and its derivatives and oleuropein aglycons were also found in the extracts although in lower concentrations. The obtained results demonstrated that gamma radiation significantly improved the extraction of phenolic compounds from both olive pomace extracts, obtaining the highest yield at 10 kGy for EOP and at 22 kGy for COP. At these doses, the total concentration of phenolic compounds in the extracts was 159±7 mg/g in the EOP and 161±2 mg/g in the COP ones. Comparing with non-irradiated samples, these values represent an increase in extractable phenolic compounds of 2.5 and 2.4 fold, respectively. Nevertheless, for EOP it was found that an absorbed dose of 5 kGy was capable to increase the phenolic content with no significant difference from the higher applied doses.
These results demonstrated that gamma radiation could be a suitable technology for the valorization of olive oil by-products, contributing to enhance extraction of phenolic compounds. This outcome can help the olive oil industry to adopt clean processes and promote the sustainable development.
Applications of bioactive compounds extracted from olive industry wastes: a review
Publication . Madureira, Joana; Margaça, Fernanda M.A.; Santos‐Buelga, Celestino; Ferreira, Isabel C.F.R.; Verde, Sandra Cabo; Barros, Lillian
The wastes generated during the olive oil extraction process, even if presenting
a negative impact for the environment, contain several bioactive compounds
that have considerable health benefits. After suitable extraction and purification,
these compounds can be used as food antioxidants or as active ingredients in
nutraceutical and cosmetic products due to their interesting technological and
pharmaceutical properties. The aim of this review, after presenting general applications
of the different types of wastes generated from this industry, is to focus
on the olive pomace produced by the two-phase system and to explore the challenging
applications of the main individual compounds present in this waste.
Hydroxytyrosol, tyrosol, oleuropein, oleuropein aglycone, and verbascoside are
the most abundant bioactive compounds present in olive pomace. Besides their
antioxidant activity, these compounds also demonstrated other biological properties
such as antimicrobial, anticancer, or anti-inflammatory, thus being used
in formulations to produce pharmaceutical and cosmetic products or in the fortification
of food. Nevertheless, it is mandatory to involve both industries and
researchers to create strategies to valorize these byproducts while maintaining
environmental sustainability.
Applications of bioactive compounds extracted from olive industry wastes: a review
Publication . Madureira, Joana; Margaça, Fernanda M.A.; Santos-Buelga, Celestino; Ferreira, Isabel C.F.R.; Cabo Verde, Sandra; Barros, Lillian
The wastes generated during the olive oil extraction process, even if presenting a negative impact for the environment, contain several bioactive compounds that have considerable health benefits. After suitable extraction and purification, these compounds can be used as food antioxidants or as active ingredients in nutraceutical and cosmetic products due to their interesting technological and pharmaceutical properties. The aim of this review, after presenting general applications of the different types of wastes generated from this industry, is to focus on the olive pomace produced by the two-phase system and to explore the challenging applications of the main individual compounds present in this waste. Hydroxytyrosol, tyrosol, oleuropein, oleuropein aglycone, and verbascoside are the most abundant bioactive compounds present in olive pomace. Besides their antioxidant activity, these compounds also demonstrated other biological properties such as antimicrobial, anticancer, or anti-inflammatory, thus being used in formulations to produce pharmaceutical and cosmetic products or in the fortification of food. Nevertheless, it is mandatory to involve both industries and researchers to create strategies to valorize these byproducts while maintaining environmental sustainability.
Applications of bioactive compounds extracted from olive industry wastes: A review
Publication . Madureira, Joana; Margaça, Fernanda M.A.; Santos-Buelga, Celestino; Ferreira, Isabel C.F.R.; Verde, Sandra Cabo; Barros, Lillian; Madureira J.
The wastes generated during the olive oil extraction process, even if presenting a negative impact for the environment, contain several bioactive compounds that have considerable health benefits. After suitable extraction and purification, these compounds can be used as food antioxidants or as active ingredients in nutraceutical and cosmetic products due to their interesting technological and pharmaceutical properties. The aim of this review, after presenting general applications of the different types of wastes generated from this industry, is to focus on the olive pomace produced by the two-phase system and to explore the challenging applications of the main individual compounds present in this waste. Hydroxytyrosol, tyrosol, oleuropein, oleuropein aglycone, and verbascoside are the most abundant bioactive compounds present in olive pomace. Besides their antioxidant activity, these compounds also demonstrated other biological properties such as antimicrobial, anticancer, or anti-inflammatory, thus being used in formulations to produce pharmaceutical and cosmetic products or in the fortification of food. Nevertheless, it is mandatory to involve both industries and researchers to create strategies to valorize these byproducts while maintaining environmental sustainability.
Preservation treatment of fresh raspberries by e-beam irradiation
Publication . Elias, M.I.; Madureira, Joana; Santos, P.M.P.; Carolino, M.M.; Margaça, Fernanda M.A.; Cabo Verde, Sandra
E-beam irradiation was studied as a post-harvest treatment for red raspberries (Rubus idaeus L.). Microbial inactivation (natural microbiota and potential pathogenic bacteria) and bioactive properties (phenolic content, vitamin C content and antioxidant activity and cytotoxicity) of these fruits were evaluated before and after irradiation and during storage of 14 days at 4 °C. A reduction of 2 log CFU/g of mesophilic bacteria and 3 log CFU/g on filamentous fungi, and no detection of foodborne inoculated pathogens (3 log CFU/g) was achieved with an e-beam treatment at 3 kGy and during 7 days of refrigerated storage. Regarding bioactive properties, the results suggested that irradiation could preserve the phenolic content and antioxidant activity of raspberries through 7 days of cold storage, even though a decrease of 80% on ascorbic acid concentration was observed. Furthermore, no in vitro inhibitory effect on human cells lines was observed for the extracts from e-beam-treated raspberries. The overall results suggested that use of e-beam irradiation as post-harvest treatment of raspberries as an emergent, clean and environmental friendly process to extend the shelf-life of this fruit with safety and preservation of bioactivity. Industrial relevance: Red raspberries are known to demonstrate high bioactivity that could be beneficial to human health, but are highly perishable and often associated with foodborne outbreaks, which makes its safety and commercialization a challenge. The use of a terminal control such as irradiation might reduce the burden of disease transmission and extend the quality of fresh red raspberries. The present research indicated that e-beam irradiation can be used as post-harvest treatment of raspberries, guarantying its safety and quality with the add-value of shelf-life extension.
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Fundação para a Ciência e a Tecnologia
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Funding Award Number
SFRH/BD/136506/2018