Impact of Stability of Enriched Oil with Phenolic Extract from Olive Mill Wastewaters

Romeo, Rosa; Bruno, Alessandra De; Imeneo, Valeria; Piscopo, Amalia; Poiana, M.

doi:10.3390/foods9070856

Cited by 27 publications

(19 citation statements)

References 49 publications

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“…Among these, the main ones were: hydroxytyrosol, tyrosol, and oleuropein in agreement with our previous work [ 21 ]. Particularly, the OWW was rich in hydroxytyrosol (1.4 mg·mL −1 ), also if this content may vary according to several factors as oil extraction technique, OWW characteristics, cultivar, extraction method of phenolic content.…”

Section: Resultssupporting

confidence: 92%

Antioxidant Efficacy of Olive By-Product Extracts in Human Colon HCT8 Cells

Centrone

D’Agostino

Difonzo

et al. 2020

Foods

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The production of olive oil is accompanied by the generation of a huge amount of waste and by-products including olive leaves, pomace, and wastewater. The latter represents a relevant environmental issue because they contain certain phytotoxic compounds that may need specific treatments before the expensive disposal. Therefore, reducing waste biomass and valorizing by-products would make olive oil production more sustainable. Here, we explore the biological actions of extracts deriving from olive by-products including olive pomace (OP), olive wastewater (OWW), and olive leaf (OLs) in human colorectal carcinoma HCT8 cells. Interestingly, with the same phenolic concentration, the extract obtained from the OWW showed higher antioxidant ability compared with the extracts derived from OP and OLs. These biological effects may be related to the differential phenolic composition of the extracts, as OWW extract contains the highest amount of hydroxytyrosol and tyrosol that are potent antioxidant compounds. Furthermore, OP extract that contains a higher level of vanillic acid than the other extracts displayed a cytotoxic action at the highest concentration. Together these findings revealed that phenols in the by-product extracts may interfere with signaling molecules that cross-link several intracellular pathways, raising the possibility to use them for beneficial health effects.

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Section: Resultssupporting

confidence: 92%

Antioxidant Efficacy of Olive By-Product Extracts in Human Colon HCT8 Cells

Centrone

D’Agostino

Difonzo

et al. 2020

Foods

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“…For this reason, the demand for more sustainable practices toward the application of a circular economy in the food system represents a key strategy for the future. Consequently, most studies are focused on improving the possibility to extract nutrients from by-products and using parts of them in the production of new functional foods [2][3][4][5]. In this context, citrus is one of the most important fruit crops in the world with an annual production exceeding 122.5 million tons, and one-third of the crop is processed, e.g., to produce juices, jams, or for the extraction of essential oils.…”

Section: Introductionmentioning

confidence: 99%

Functionalized Biscuits with Bioactive Ingredients Obtained by Citrus Lemon Pomace

Imeneo

Romeo

Gattuso

et al. 2021

Foods

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In this study, functionalized biscuits were prepared through the enrichment of dough with lemon peel and natural antioxidants extracted from lemon pomace. Lemon pomace extract (LPE) was analyzed for total phenolic content before addition, and then a known concentration of 50 mg kg − 1 was used for the formulation of enriched biscuits. Three different biscuit samples were compared to a control biscuit, without the addition of functional ingredients. The main physicochemical, microbiological, and sensory aspects of doughs and biscuits enriched with LPE were investigated. The enriched biscuits showed higher phenolic content and antioxidant activity than the control one and a longer induction period (IP), which means that the enriched products had a higher intrinsic resistance to lipid oxidation, thanks to the antioxidant effect exerted by the added fresh lemon peel and the LPE. Furthermore, from a sensorial point of view, they showed suitable acceptability, in terms of appearance, flavor, and aromatic attributes. Thus, results indicated that the incorporation of lemon processing by-products allowed the production of functional enriched biscuits with improved antioxidant properties.

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“…The identification and quantification of the most representative compounds identified in OMW was performed by using ultra-high performance liquid chromatography (UHPLC), as previously described [ 47 ]. An UHPLC PLATIN blue (Knauer, Germany), equipped with a binary pump system and a Knauer column C18 (100 × 2 mm, 1.8 μm), coupled with a Photo Diode Array Detector (PDA)-1 PLATIN blue (Knauer, Germany), was used.…”

Section: Methodsmentioning

confidence: 99%

Concentration of Bioactive Phenolic Compounds in Olive Mill Wastewater by Direct Contact Membrane Distillation

et al. 2021

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Olive mill wastewater (OMW), generated as a by-product of olive oil production, is considered one of the most polluting effluents produced by the agro-food industry, due to its high concentration of organic matter and nutrients. However, OMW is rich in several polyphenols, representing compounds with remarkable biological properties. This study aimed to analyze the chemical profile as well as the antioxidant and anti-obesity properties of concentrated fractions obtained from microfiltered OMW treated by direct contact membrane distillation (DCMD). Ultra-high performance liquid chromatography (UHPLC) analyses were applied to quantify some phenols selected as phytochemical markers. Moreover, a-Amylase, a-glucosidase, and lipase inhibitory activity were investigated together with the antioxidant activity by means of assays, namely b-carotene bleaching, 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulphonic) acid (ABTS) diammonium salts, 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay, and Ferric Reducing Activity Power (FRAP) tests. MD retentate—which has content of about five times greater of hydroxytyrosol and verbascoside and about 7 times greater of oleuropein than the feed—was more active as an antioxidant in all applied assays. Of interest is the result obtained in the DPPH test (an inhibitory concentration 50% (IC50) of 9.8 mg/mL in comparison to the feed (IC50 of 97.2 mg/mL)) and in the ABTS assay (an IC50 of 0.4 mg/mL in comparison to the feed (IC50 of 1.2 mg/mL)).

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Impact of Stability of Enriched Oil with Phenolic Extract from Olive Mill Wastewaters

Cited by 27 publications

References 49 publications

Antioxidant Efficacy of Olive By-Product Extracts in Human Colon HCT8 Cells

Antioxidant Efficacy of Olive By-Product Extracts in Human Colon HCT8 Cells

Functionalized Biscuits with Bioactive Ingredients Obtained by Citrus Lemon Pomace

Concentration of Bioactive Phenolic Compounds in Olive Mill Wastewater by Direct Contact Membrane Distillation

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