Phenolic compounds and contaminants in olive oil and pomace – A narrative review of their biological and toxic effects

Schmidt, Lucas; Prestes, Osmar D.; Augusti, Paula Rossini; Moreira, José Cláudio Fonseca

doi:10.1016/j.fbio.2023.102626

Cited by 17 publications

(8 citation statements)

References 84 publications

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“…Notably, other molecules (e.g., micronutrients, pigments, pesticides, drugs, etc.) present in CSs can be extracted along with the phenolic compounds and, furthermore, interfere with their digestibility, exerting negative effects [22][23][24]. This may also explain the 30% of maximum bioaccessibility and reduction in the phenolic content and bioactivity of CS extract after in vitro digestion.…”

Section: Bioaccessibilitymentioning

confidence: 99%

Simulated Gastrointestinal Digestion of Chestnut (Castanea sativa Mill.) Shell Extract Prepared by Subcritical Water Extraction: Bioaccessibility, Bioactivity, and Intestinal Permeability by In Vitro Assays

et al. 2023

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Chestnut shells (CSs) are an appealing source of bioactive molecules, and constitute a popular research topic. This study explores the effects of in vitro gastrointestinal digestion and intestinal permeability on the bioaccessibility and bioactivity of polyphenols from CS extract prepared by subcritical water extraction (SWE). The results unveiled higher phenolic concentrations retained after gastric and intestinal digestion. The bioaccessibility and antioxidant/antiradical properties were enhanced in the following order: oral < gastric ≤ intestinal digests, attaining 40% of the maximum bioaccessibility. Ellagic acid was the main polyphenol in the digested and undigested extract, while pyrogallol–protocatechuic acid derivative was only quantified in the digests. The CS extract revealed potential mild hypoglycemic (<25%) and neuroprotective (<75%) properties before and after in vitro digestion, along with upmodulating the antioxidant enzymes’ activities and downregulating the lipid peroxidation. The intestinal permeation of ellagic acid achieved 22.89% after 240 min. This study highlighted the efficacy of the CS extract on the delivery of polyphenols, sustaining its promising use as nutraceutical ingredient.

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Section: Bioaccessibilitymentioning

confidence: 99%

Simulated Gastrointestinal Digestion of Chestnut (Castanea sativa Mill.) Shell Extract Prepared by Subcritical Water Extraction: Bioaccessibility, Bioactivity, and Intestinal Permeability by In Vitro Assays

et al. 2023

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“…1 While PCs are identified at trace levels ranging from ng•L −1 to μg•L −1 , prolonged exposure to these substances can pose risks to ecosystems and human health. 2 For this reason, the U.S. Environmental Protection Agency has designated them as priority contaminants. 3 As one of the conventional oxidizing agents, permanganate (Mn(VII)) finds extensive application in the field of wastewater purification due to its notable attributes, including efficacy, low cost, and negligible production of halogenated byproducts.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In recent years, the widespread occurrence of phenolic compounds (PCs) in aquatic environments has garnered significant attention . While PCs are identified at trace levels ranging from ng·L –1 to μg·L –1 , prolonged exposure to these substances can pose risks to ecosystems and human health . For this reason, the U.S. Environmental Protection Agency has designated them as priority contaminants .…”

Section: Introductionmentioning

confidence: 99%

Unraveling the Role of Humic Acid in the Oxidation of Phenolic Contaminants by Soluble Manganese Oxo-Anions

Wang,

Chai,

et al. 2024

Environ. Sci. Technol.

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Humic acid (HA) is ubiquitous in natural aquatic environments and effectively accelerates decontamination by permanganate (Mn(VII)). However, the detailed mechanism remains uncertain. Herein, the intrinsic mechanisms of HA's impact on phenolics oxidation by Mn(VII) and its intermediate manganese oxo-anions were systematically studied. Results suggested that HA facilitated the transfer of a single electron from Mn(VII), resulting in the sequential formation of Mn(VI) and Mn(V). The formed Mn(V) was further reduced to Mn(III) through a double electron transfer process by HA. Mn(III) was responsible for the HA-boosted oxidation as the active species attacking pollutants, while Mn(VI) and Mn(V) tended to act as intermediate species due to their own instability. In addition, HA could serve as a stabilizer to form a complex with produced Mn(III) and retard the disproportionation of Mn(III). Notably, manganese oxo-anions did not mineralize HA but essentially changed its composition. According to the results of Fourier-transform ion cyclotron resonance mass spectrometry and the second derivative analysis of Fourier-transform infrared spectroscopy, we found that manganese oxo-anions triggered the decomposition of C−H bonds on HA and subsequently produced oxygen-containing functional groups (i.e., C−O). This study might shed new light on the HA/manganese oxo-anion process.

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“…The industrial two-phase OP mainly consists of olive pulp and seeds. It also has a high amount of water (60–80%), contains phytotoxic compounds (polyphenols), and is possibly contaminated with pesticides [ 16 , 17 , 18 ], which makes its disposal and storage very challenging [ 19 , 20 ]. To resolve this challenge, the HTC of OP to produce hydrochars for biofuel applications was recommended by several research studies.…”

Section: Introductionmentioning

confidence: 99%

Industrial Two-Phase Olive Pomace Slurry-Derived Hydrochar Fuel for Energy Applications

Karim,

Martínez-Cartas,

Cuevas-Aranda

2024

Polymers

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The present study aims to resolve the existing research gaps on olive pomace (OP) hydrochars application as a fuel by evaluating its molecular structures (FTIR and solid NMR analysis), identifying influential characteristics (Pearson correlation analysis), process optimization (response surface methodology), slagging–fouling risks (empirical indices), and combustion performance (TG-DSC analysis). The response surfaces plot for hydrothermal carbonization (HTC) of OP slurry performed in a pressure reactor under varied temperatures (180–250 °C) and residence times (2–30 min) revealed 250 °C for 30 min to be optimal conditions for producing hydrochar fuel with a higher heating value (32.20 MJ·Kg−1) and energy densification ratio (1.40). However, in terms of process efficiency and cost-effectiveness, the optimal HTC conditions for producing the hydrochar with the highest energy yield of 87.9% were 202.7 °C and 2.0 min. The molecular structure of hydrochar was mainly comprised of aromatic rings with methyl groups, alpha-C atoms of esters, and ether bond linkages of lignin fractions. The slagging and fouling risks of hydrochars were comparatively lower than those of raw OP, as indicated by low slagging and fouling indices. The Pearson correlation analysis emphasized that the enrichment of acid-insoluble lignin and extractive contents, carbon densification, and reduced ash content were the main pivotal factors for hydrochar to exhibit better biofuel characteristics for energy applications.

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Phenolic compounds and contaminants in olive oil and pomace – A narrative review of their biological and toxic effects

Cited by 17 publications

References 84 publications

Simulated Gastrointestinal Digestion of Chestnut (Castanea sativa Mill.) Shell Extract Prepared by Subcritical Water Extraction: Bioaccessibility, Bioactivity, and Intestinal Permeability by In Vitro Assays

Simulated Gastrointestinal Digestion of Chestnut (Castanea sativa Mill.) Shell Extract Prepared by Subcritical Water Extraction: Bioaccessibility, Bioactivity, and Intestinal Permeability by In Vitro Assays

Unraveling the Role of Humic Acid in the Oxidation of Phenolic Contaminants by Soluble Manganese Oxo-Anions

Industrial Two-Phase Olive Pomace Slurry-Derived Hydrochar Fuel for Energy Applications

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