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Recent Advances in Natural Polyphenol Research. Molecules 2022; 27:molecules27248777. [PMID: 36557912 PMCID: PMC9787743 DOI: 10.3390/molecules27248777] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2022] [Revised: 12/08/2022] [Accepted: 12/09/2022] [Indexed: 12/14/2022] Open
Abstract
Polyphenols are secondary metabolites produced by plants, which contribute to the plant's defense against abiotic stress conditions (e.g., UV radiation and precipitation), the aggression of herbivores, and plant pathogens. Epidemiological studies suggest that long-term consumption of plant polyphenols protects against cardiovascular disease, cancer, osteoporosis, diabetes, and neurodegenerative diseases. Their structural diversity has fascinated and confronted analytical chemists on how to carry out unambiguous identification, exhaustive recovery from plants and organic waste, and define their nutritional and biological potential. The food, cosmetic, and pharmaceutical industries employ polyphenols from fruits and vegetables to produce additives, additional foods, and supplements. In some cases, nanocarriers have been used to protect polyphenols during food processing, to solve the issues related to low water solubility, to transport them to the site of action, and improve their bioavailability. This review summarizes the structure-bioactivity relationships, processing parameters that impact polyphenol stability and bioavailability, the research progress in nanocarrier delivery, and the most innovative methodologies for the exhaustive recovery of polyphenols from plant and agri-waste materials.
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Manthos G, Zagklis D, Papapanou M, Zafiri C, Kornaros M. High-rate in-vessel continuous composting of olive mill byproducts. WASTE MANAGEMENT (NEW YORK, N.Y.) 2022; 151:105-112. [PMID: 35939949 DOI: 10.1016/j.wasman.2022.07.037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 07/25/2022] [Accepted: 07/27/2022] [Indexed: 06/15/2023]
Abstract
The increasing production of agro-industrial organic residues in modern society is extremely concerning. One of the most polluting procedures in the agricultural industry is the production of olive oil. This process creates a large amount of waste with high organic load and phytotoxic components. In this study, composting of two-phase olive pomace (OP), olive leaves (OL) and dewatered anaerobic sludge (DAS) from an olive mill wastewater anaerobic digestion process was conducted in a pilot-scale in-vessel high-rate continuous composter. Five different feed scenarios were studied with different OP/OL ratio in the feed material, while the effect of the addition of pine tree bark pieces (PB) and DAS was examined. The OP:OL 95:5 % w/w ratio exhibited the best results in terms of product quality, while OL proved capable of acting as a bulking agent for the better aeration of the material. The final product in the optimum feed ratio was free of Salmonella spp., was stable in terms of static respiratory index (lower than 0.5 g O2 kg-1 VS h-1) but contained elevated E. coli levels (3.5 × 104 CFU g-1 with a limit of 1 × 103 CFU g-1), which was the only EU proposed compost quality criteria not met. The addition of a more easily degradable material in the feed mixture is expected to lead to elevated composting temperature and amend the presence of pathogens.
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Affiliation(s)
- Georgios Manthos
- Laboratory of Biochemical Engineering & Environmental Technology (LBEET), Department of Chemical Engineering, University of Patras, 1 Karatheodori Str, 26504 Patras, Greece
| | - Dimitris Zagklis
- Laboratory of Biochemical Engineering & Environmental Technology (LBEET), Department of Chemical Engineering, University of Patras, 1 Karatheodori Str, 26504 Patras, Greece
| | - Melina Papapanou
- Laboratory of Biochemical Engineering & Environmental Technology (LBEET), Department of Chemical Engineering, University of Patras, 1 Karatheodori Str, 26504 Patras, Greece
| | | | - Michael Kornaros
- Laboratory of Biochemical Engineering & Environmental Technology (LBEET), Department of Chemical Engineering, University of Patras, 1 Karatheodori Str, 26504 Patras, Greece.
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Papageorgiou CS, Lyri P, Xintaropoulou I, Diamantopoulos I, Zagklis DP, Paraskeva CA. High-Yield Production of a Rich-in-Hydroxytyrosol Extract from Olive (Olea europaea) Leaves. Antioxidants (Basel) 2022; 11:antiox11061042. [PMID: 35739939 PMCID: PMC9220257 DOI: 10.3390/antiox11061042] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Revised: 05/21/2022] [Accepted: 05/23/2022] [Indexed: 12/10/2022] Open
Abstract
The aim of the present study was to explore the high-yield production of hydroxytyrosol, a phenolic compound with very high antioxidant capacity. Olea europaea leaves were chosen as feedstock as they contain significant amounts of oleuropein, which can be hydrolyzed to hydroxytyrosol. The chosen techniques are widely used in the industry and can be easily scaled up. Olive leaves underwent drying and mechanical pretreatment and extractives were transported to a solvent by solid–liquid extraction using water–ethanol mixtures. The use of approximately 60–80% ethanol showed an almost 2-fold increase in extracted phenolics compared to pure water, to approximately 45 g/kg of dry leaves. Extracted oleuropein was hydrolyzed with hydrochloric acid and the hydrolysate was extracted with ethyl acetate after pH adjustment. This step led to a hydroxytorosol content increase from less than 4% to approximately 60% w/w of dry extract, or 10–15 g of hydroxytyrosol recovery per kg of dry leaves.
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Affiliation(s)
- Costas S. Papageorgiou
- Laboratory of Transport Phenomena and Physicochemical Hydrodynamics (LTPPH), Department of Chemical Engineering, University of Patras, 26504 Patras, Greece; (C.S.P.); (P.L.); (I.X.); (I.D.); (D.P.Z.)
- Institute of Chemical Engineering Sciences, FORTH/ICE-HT, 26504 Patras, Greece
| | - Paraskevi Lyri
- Laboratory of Transport Phenomena and Physicochemical Hydrodynamics (LTPPH), Department of Chemical Engineering, University of Patras, 26504 Patras, Greece; (C.S.P.); (P.L.); (I.X.); (I.D.); (D.P.Z.)
| | - Ioanna Xintaropoulou
- Laboratory of Transport Phenomena and Physicochemical Hydrodynamics (LTPPH), Department of Chemical Engineering, University of Patras, 26504 Patras, Greece; (C.S.P.); (P.L.); (I.X.); (I.D.); (D.P.Z.)
| | - Ioannis Diamantopoulos
- Laboratory of Transport Phenomena and Physicochemical Hydrodynamics (LTPPH), Department of Chemical Engineering, University of Patras, 26504 Patras, Greece; (C.S.P.); (P.L.); (I.X.); (I.D.); (D.P.Z.)
| | - Dimitris P. Zagklis
- Laboratory of Transport Phenomena and Physicochemical Hydrodynamics (LTPPH), Department of Chemical Engineering, University of Patras, 26504 Patras, Greece; (C.S.P.); (P.L.); (I.X.); (I.D.); (D.P.Z.)
- Institute of Chemical Engineering Sciences, FORTH/ICE-HT, 26504 Patras, Greece
| | - Christakis A. Paraskeva
- Laboratory of Transport Phenomena and Physicochemical Hydrodynamics (LTPPH), Department of Chemical Engineering, University of Patras, 26504 Patras, Greece; (C.S.P.); (P.L.); (I.X.); (I.D.); (D.P.Z.)
- Institute of Chemical Engineering Sciences, FORTH/ICE-HT, 26504 Patras, Greece
- Correspondence:
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Tapia-Quirós P, Montenegro-Landívar MF, Reig M, Vecino X, Saurina J, Granados M, Cortina JL. Integration of membrane processes for the recovery and separation of polyphenols from winery and olive mill wastes using green solvent-based processing. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 307:114555. [PMID: 35085965 DOI: 10.1016/j.jenvman.2022.114555] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 12/26/2021] [Accepted: 01/16/2022] [Indexed: 06/14/2023]
Abstract
Winery and olive mill industries generate large amounts of wastes causing important environmental problems. The main aim of this work is the evaluation of different membrane separation processes like microfiltration, ultrafiltration, nanofiltration, and reverse osmosis for the recovery of polyphenols from winery and olive mill wastes in aqueous solutions. Membrane processes were tested separately in a closed-loop system, and by an integration in a concentration mode sequential design (open-loop). Feed flow rate was varied from 1 to 10 mL min-1, and permeate samples were taken in order to measure the polyphenols concentration. The separation and concentration efficiency were evaluated in terms of total polyphenol content, and by polyphenols families (hydroxybenzoic acids (HB), hydroxycinnamic acids (HC), and flavonoids (F)), using high performance liquid chromatography. Results showed that MF and UF membranes removed suspended solids and colloids from the extracts. NF was useful for polyphenols separation (HB rejections were lower than for HC and F: HB rejections of 50 and 63% for lees filters and olive pomace extracts, respectively), and RO membranes were able to concentrate polyphenols streams (86 and 95% rejection from lees filters and olive pomace, respectively). Membranes sequential designs for lees filters and olive pomace extracts, using a selective membrane train composed by UF, NF and RO membranes, were able to obtain polyphenol rich streams and high-quality water streams for reuse purposes.
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Affiliation(s)
- P Tapia-Quirós
- Chemical Engineering Department, Escola d'Enginyeria de Barcelona Est (EEBE), Universitat Politècnica de Catalunya (UPC)-BarcelonaTECH, C/ Eduard Maristany 10-14, Campus Diagonal-Besòs, 08930, Barcelona, Spain; Barcelona Research Center for Multiscale Science and Engineering, Campus Diagonal-Besòs, 08930, Barcelona, Spain
| | - M F Montenegro-Landívar
- Chemical Engineering Department, Escola d'Enginyeria de Barcelona Est (EEBE), Universitat Politècnica de Catalunya (UPC)-BarcelonaTECH, C/ Eduard Maristany 10-14, Campus Diagonal-Besòs, 08930, Barcelona, Spain; Barcelona Research Center for Multiscale Science and Engineering, Campus Diagonal-Besòs, 08930, Barcelona, Spain
| | - M Reig
- Chemical Engineering Department, Escola d'Enginyeria de Barcelona Est (EEBE), Universitat Politècnica de Catalunya (UPC)-BarcelonaTECH, C/ Eduard Maristany 10-14, Campus Diagonal-Besòs, 08930, Barcelona, Spain; Barcelona Research Center for Multiscale Science and Engineering, Campus Diagonal-Besòs, 08930, Barcelona, Spain
| | - X Vecino
- Chemical Engineering Department, Escola d'Enginyeria de Barcelona Est (EEBE), Universitat Politècnica de Catalunya (UPC)-BarcelonaTECH, C/ Eduard Maristany 10-14, Campus Diagonal-Besòs, 08930, Barcelona, Spain; Barcelona Research Center for Multiscale Science and Engineering, Campus Diagonal-Besòs, 08930, Barcelona, Spain; CINTECX, University of Vigo, Chemical Engineering Department, 36310, Vigo, Spain
| | - J Saurina
- Department of Chemical Engineering and Analytical Chemistry, Universitat de Barcelona, Diagonal 645, 08028, Barcelona, Spain
| | - M Granados
- Department of Chemical Engineering and Analytical Chemistry, Universitat de Barcelona, Diagonal 645, 08028, Barcelona, Spain
| | - J L Cortina
- Chemical Engineering Department, Escola d'Enginyeria de Barcelona Est (EEBE), Universitat Politècnica de Catalunya (UPC)-BarcelonaTECH, C/ Eduard Maristany 10-14, Campus Diagonal-Besòs, 08930, Barcelona, Spain; Barcelona Research Center for Multiscale Science and Engineering, Campus Diagonal-Besòs, 08930, Barcelona, Spain; CETAQUA, Carretera d'Esplugues, 75, 08940, Cornellà de Llobregat, Spain.
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Tapia-Quirós P, Montenegro-Landívar MF, Reig M, Vecino X, Saurina J, Granados M, Cortina JL. Integration of Nanofiltration and Reverse Osmosis Technologies in Polyphenols Recovery Schemes from Winery and Olive Mill Wastes by Aqueous-Based Processing. MEMBRANES 2022; 12:339. [PMID: 35323814 PMCID: PMC8954601 DOI: 10.3390/membranes12030339] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Revised: 03/16/2022] [Accepted: 03/16/2022] [Indexed: 11/16/2022]
Abstract
More sustainable waste management in the winery and olive oil industries has become a major challenge. Therefore, waste valorization to obtain value-added products (e.g., polyphenols) is an efficient alternative that contributes to circular approaches and sustainable environmental protection. In this work, an integration scheme was purposed based on sustainable extraction and membrane separation processes, such as nanofiltration (NF) and reverse osmosis (RO), for the recovery of polyphenols from winery and olive mill wastes. Membrane processes were evaluated in a closed-loop system and with a flat-sheet membrane configuration (NF270, NF90, and Duracid as NF membranes, and BW30LE as RO membrane). The separation and concentration efficiency were evaluated in terms of the total polyphenol content (TPC), and by polyphenol families (hydroxybenzoic acids, hydroxycinnamic acids, and flavonoids), using high-performance liquid chromatography. The water trans-membrane flux was dependent on the trans-membrane pressure for the NF and RO processes. NF90 membrane rejected around 91% of TPC for the lees filters extracts while NF270 membrane rejected about 99% of TPC for the olive pomace extracts. Otherwise, RO membranes rejected more than 99.9% of TPC for both types of agri-food wastes. Hence, NF and RO techniques could be used to obtain polyphenol-rich streams, and clean water for reuse purposes.
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Affiliation(s)
- Paulina Tapia-Quirós
- Chemical Engineering Department, Escola d’Enginyeria de Barcelona Est (EEBE), Campus Diagonal-Besòs, Universitat Politècnica de Catalunya (UPC)-BarcelonaTECH, C/Eduard Maristany 10–14, 08930 Barcelona, Spain; (P.T.-Q.); (M.F.M.-L.); (M.R.); (X.V.)
- Barcelona Research Center for Multiscale Science and Engineering, Campus Diagonal-Besòs, 08930 Barcelona, Spain
| | - María Fernanda Montenegro-Landívar
- Chemical Engineering Department, Escola d’Enginyeria de Barcelona Est (EEBE), Campus Diagonal-Besòs, Universitat Politècnica de Catalunya (UPC)-BarcelonaTECH, C/Eduard Maristany 10–14, 08930 Barcelona, Spain; (P.T.-Q.); (M.F.M.-L.); (M.R.); (X.V.)
- Barcelona Research Center for Multiscale Science and Engineering, Campus Diagonal-Besòs, 08930 Barcelona, Spain
| | - Mònica Reig
- Chemical Engineering Department, Escola d’Enginyeria de Barcelona Est (EEBE), Campus Diagonal-Besòs, Universitat Politècnica de Catalunya (UPC)-BarcelonaTECH, C/Eduard Maristany 10–14, 08930 Barcelona, Spain; (P.T.-Q.); (M.F.M.-L.); (M.R.); (X.V.)
- Barcelona Research Center for Multiscale Science and Engineering, Campus Diagonal-Besòs, 08930 Barcelona, Spain
| | - Xanel Vecino
- Chemical Engineering Department, Escola d’Enginyeria de Barcelona Est (EEBE), Campus Diagonal-Besòs, Universitat Politècnica de Catalunya (UPC)-BarcelonaTECH, C/Eduard Maristany 10–14, 08930 Barcelona, Spain; (P.T.-Q.); (M.F.M.-L.); (M.R.); (X.V.)
- Barcelona Research Center for Multiscale Science and Engineering, Campus Diagonal-Besòs, 08930 Barcelona, Spain
- Centro de Investigación en Tecnologías, Energía y Procesos Industriales (CINTECX), Chemical Engineering Department, Campus As Lagoas-Marcosende, University of Vigo, 36310 Vigo, Spain
| | - Javier Saurina
- Department of Chemical Engineering and Analytical Chemistry, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain; (J.S.); (M.G.)
| | - Mercè Granados
- Department of Chemical Engineering and Analytical Chemistry, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain; (J.S.); (M.G.)
| | - José Luis Cortina
- Chemical Engineering Department, Escola d’Enginyeria de Barcelona Est (EEBE), Campus Diagonal-Besòs, Universitat Politècnica de Catalunya (UPC)-BarcelonaTECH, C/Eduard Maristany 10–14, 08930 Barcelona, Spain; (P.T.-Q.); (M.F.M.-L.); (M.R.); (X.V.)
- Barcelona Research Center for Multiscale Science and Engineering, Campus Diagonal-Besòs, 08930 Barcelona, Spain
- Water Technology Centre (CETAQUA), Carretera d’Esplugues 75, 08940 Cornellà de Llobregat, Spain
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Tapia-Quirós P, Montenegro-Landívar MF, Reig M, Vecino X, Cortina JL, Saurina J, Granados M. Recovery of Polyphenols from Agri-Food By-Products: The Olive Oil and Winery Industries Cases. Foods 2022; 11:362. [PMID: 35159513 PMCID: PMC8834469 DOI: 10.3390/foods11030362] [Citation(s) in RCA: 40] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 01/20/2022] [Accepted: 01/21/2022] [Indexed: 02/06/2023] Open
Abstract
The production of olive oil and wine are two of the main agri-food economic activities in Southern Europe. They generate large amounts of solid and liquid wastes (e.g., olive pomace, olive mill wastewater, grape pomace, grape stems, wine lees, and wine processing wastewater) that represent a major environmental problem. Consequently, the management of these residues has become a big challenge for these industries, since they are harmful to the environment but rich in bioactive compounds, such as polyphenols. In recent years, the recovery of phenolic compounds has been proposed as a smart strategy for the valorization of these by-products, from a circular economy perspective. This review aims to provide a comprehensive description of the state of the art of techniques available for the analysis, extraction, and purification of polyphenols from the olive mill and winery residues. Thus, the integration and implementation of these techniques could provide a sustainable solution to the olive oil and winery sectors.
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Affiliation(s)
- Paulina Tapia-Quirós
- Department of Chemical Engineering and Analytical Chemistry, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain; (P.T.-Q.); (M.F.M.-L.); (J.S.)
- Chemical Engineering Department, Escola d’Enginyeria de Barcelona Est (EEBE), Campus Diagonal-Besòs, Universitat Politècnica de Catalunya (UPC)-BarcelonaTECH, C/Eduard Maristany 10-14, 08930 Barcelona, Spain; (M.R.); (J.L.C.)
- Barcelona Research Center for Multiscale Science and Engineering, Chemical Engineering Department, Escola d’Enginyeria de Barcelona Est (EEBE), Campus Diagonal-Besòs, 08930 Barcelona, Spain
| | - María Fernanda Montenegro-Landívar
- Department of Chemical Engineering and Analytical Chemistry, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain; (P.T.-Q.); (M.F.M.-L.); (J.S.)
- Chemical Engineering Department, Escola d’Enginyeria de Barcelona Est (EEBE), Campus Diagonal-Besòs, Universitat Politècnica de Catalunya (UPC)-BarcelonaTECH, C/Eduard Maristany 10-14, 08930 Barcelona, Spain; (M.R.); (J.L.C.)
- Barcelona Research Center for Multiscale Science and Engineering, Chemical Engineering Department, Escola d’Enginyeria de Barcelona Est (EEBE), Campus Diagonal-Besòs, 08930 Barcelona, Spain
| | - Mònica Reig
- Chemical Engineering Department, Escola d’Enginyeria de Barcelona Est (EEBE), Campus Diagonal-Besòs, Universitat Politècnica de Catalunya (UPC)-BarcelonaTECH, C/Eduard Maristany 10-14, 08930 Barcelona, Spain; (M.R.); (J.L.C.)
- Barcelona Research Center for Multiscale Science and Engineering, Chemical Engineering Department, Escola d’Enginyeria de Barcelona Est (EEBE), Campus Diagonal-Besòs, 08930 Barcelona, Spain
| | - Xanel Vecino
- Chemical Engineering Department, Escola d’Enginyeria de Barcelona Est (EEBE), Campus Diagonal-Besòs, Universitat Politècnica de Catalunya (UPC)-BarcelonaTECH, C/Eduard Maristany 10-14, 08930 Barcelona, Spain; (M.R.); (J.L.C.)
- Barcelona Research Center for Multiscale Science and Engineering, Chemical Engineering Department, Escola d’Enginyeria de Barcelona Est (EEBE), Campus Diagonal-Besòs, 08930 Barcelona, Spain
- Chemical Engineering Department, Research Center in Technologies, Energy and Industrial Processes—CINTECX, Campus As Lagoas-Marcosende, University of Vigo, 36310 Vigo, Spain
| | - José Luis Cortina
- Chemical Engineering Department, Escola d’Enginyeria de Barcelona Est (EEBE), Campus Diagonal-Besòs, Universitat Politècnica de Catalunya (UPC)-BarcelonaTECH, C/Eduard Maristany 10-14, 08930 Barcelona, Spain; (M.R.); (J.L.C.)
- Barcelona Research Center for Multiscale Science and Engineering, Chemical Engineering Department, Escola d’Enginyeria de Barcelona Est (EEBE), Campus Diagonal-Besòs, 08930 Barcelona, Spain
- Water Technology Center—CETAQUA, Carretera d’Esplugues, 75, 08940 Cornellà de Llobregat, Spain
| | - Javier Saurina
- Department of Chemical Engineering and Analytical Chemistry, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain; (P.T.-Q.); (M.F.M.-L.); (J.S.)
| | - Mercè Granados
- Department of Chemical Engineering and Analytical Chemistry, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain; (P.T.-Q.); (M.F.M.-L.); (J.S.)
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Pompei S, Grimm C, Schiller C, Schober L, Kroutil W. Thiols Act as Methyl Traps in the Biocatalytic Demethylation of Guaiacol Derivatives. Angew Chem Int Ed Engl 2021; 60:16906-16910. [PMID: 34057803 PMCID: PMC8361964 DOI: 10.1002/anie.202104278] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 05/24/2021] [Indexed: 12/13/2022]
Abstract
Demethylating methyl phenyl ethers is challenging, especially when the products are catechol derivatives prone to follow-up reactions. For biocatalytic demethylation, monooxygenases have previously been described requiring molecular oxygen which may cause oxidative side reactions. Here we show that such compounds can be demethylated anaerobically by using cobalamin-dependent methyltransferases exploiting thiols like ethyl 3-mercaptopropionate as a methyl trap. Using just two equivalents of this reagent, a broad spectrum of substituted guaiacol derivatives were demethylated, with conversions mostly above 90 %. This strategy was used to prepare the highly valuable antioxidant hydroxytyrosol on a one-gram scale in 97 % isolated yield.
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Affiliation(s)
- Simona Pompei
- Institute of Chemistry, Biocatalytic SynthesisUniversity of Graz, NAWI GrazHeinrichstrasse 288010GrazAustria
| | - Christopher Grimm
- Institute of Chemistry, Biocatalytic SynthesisUniversity of Graz, NAWI GrazHeinrichstrasse 288010GrazAustria
| | - Christine Schiller
- Institute of Chemistry, Biocatalytic SynthesisUniversity of Graz, NAWI GrazHeinrichstrasse 288010GrazAustria
| | - Lukas Schober
- Institute of Chemistry, Biocatalytic SynthesisUniversity of Graz, NAWI GrazHeinrichstrasse 288010GrazAustria
| | - Wolfgang Kroutil
- Institute of Chemistry, Biocatalytic SynthesisUniversity of Graz, NAWI GrazHeinrichstrasse 288010GrazAustria
- BioTechMed Graz8010GrazAustria
- Field of Excellence BioHealth-University of Graz8010GrazAustria
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8
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Pompei S, Grimm C, Schiller C, Schober L, Kroutil W. Thiols Act as Methyl Traps in the Biocatalytic Demethylation of Guaiacol Derivatives. ANGEWANDTE CHEMIE (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 133:17043-17047. [PMID: 38505659 PMCID: PMC10946705 DOI: 10.1002/ange.202104278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 05/24/2021] [Indexed: 11/10/2022]
Abstract
Demethylating methyl phenyl ethers is challenging, especially when the products are catechol derivatives prone to follow-up reactions. For biocatalytic demethylation, monooxygenases have previously been described requiring molecular oxygen which may cause oxidative side reactions. Here we show that such compounds can be demethylated anaerobically by using cobalamin-dependent methyltransferases exploiting thiols like ethyl 3-mercaptopropionate as a methyl trap. Using just two equivalents of this reagent, a broad spectrum of substituted guaiacol derivatives were demethylated, with conversions mostly above 90 %. This strategy was used to prepare the highly valuable antioxidant hydroxytyrosol on a one-gram scale in 97 % isolated yield.
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Affiliation(s)
- Simona Pompei
- Institute of Chemistry, Biocatalytic SynthesisUniversity of Graz, NAWI GrazHeinrichstrasse 288010GrazAustria
| | - Christopher Grimm
- Institute of Chemistry, Biocatalytic SynthesisUniversity of Graz, NAWI GrazHeinrichstrasse 288010GrazAustria
| | - Christine Schiller
- Institute of Chemistry, Biocatalytic SynthesisUniversity of Graz, NAWI GrazHeinrichstrasse 288010GrazAustria
| | - Lukas Schober
- Institute of Chemistry, Biocatalytic SynthesisUniversity of Graz, NAWI GrazHeinrichstrasse 288010GrazAustria
| | - Wolfgang Kroutil
- Institute of Chemistry, Biocatalytic SynthesisUniversity of Graz, NAWI GrazHeinrichstrasse 288010GrazAustria
- BioTechMed Graz8010GrazAustria
- Field of Excellence BioHealth-University of Graz8010GrazAustria
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Çelik G, Saygın Ö, Akmehmet Balcıoğlu I. Multistage recovery process of phenolic antioxidants with a focus on hydroxytyrosol from olive mill wastewater concentrates. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2020.117757] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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10
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Technoeconomic Analysis of the Recovery of Phenols from Olive Mill Wastewater through Membrane Filtration and Resin Adsorption/Desorption. SUSTAINABILITY 2021. [DOI: 10.3390/su13042376] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Olive mill wastewater is an important agro-industrial waste with no established treatment method. The authors have developed a phenol separation method that could potentially cover the treatment cost of the waste. The purpose of this study was to identify any economic hotspots in the process, the operational cost and examine the margin of profit for such a process. The equipment cost was scaled for different treatment capacities and then used to estimate the fixed capital investment and the yearly operational cost. The highest purchased equipment cost was identified for the membrane filtration system, while the cost for resin replacement was identified as the highest operational cost. The lifespan of the resin used in the adsorption step was identified as an economic hot spot for the process, with the phenols separation cost ranging from 0.84 to 13.6 €/g of phenols for a resin lifespan of 5–100 adsorption/desorption cycles. The lifespan of the resin proved to be the single most important aspect that determines the phenols separation cost. The price range that was calculated for the product of the process is very promising because of the typical value of antioxidants and the low concentration of phenols that are needed for food supplements and cosmetics.
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Lama-Muñoz A, Contreras MDM, Espínola F, Moya M, Romero I, Castro E. Content of phenolic compounds and mannitol in olive leaves extracts from six Spanish cultivars: Extraction with the Soxhlet method and pressurized liquids. Food Chem 2020; 320:126626. [PMID: 32222659 DOI: 10.1016/j.foodchem.2020.126626] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Revised: 03/12/2020] [Accepted: 03/15/2020] [Indexed: 12/22/2022]
Abstract
Olive leaves are considered a promising source of bioactives such as phenolic compounds and mannitol. The extraction of high added value products is an issue of great interest and importance from the point of view of their exploitation. However, the content of these compounds can differ between cultivars and extraction methods. In this work, six olive leaves cultivars, including three wild cultivars, and two extraction processes (an innovative and alternative technique, pressurized liquid extraction, and a conventional Soxhlet extraction) were evaluated and compared towards the selective recovery of bioactive compounds. The wild cultivars showed the highest content of phenolic and flavonoid compounds, being oleuropein the compound present in higher amount. Findings also revealed that the highest mannitol content in the extracts was observed with the commercial cultivars, specifically in Arbequina. It is thus possible to decide which cultivars to use in order to obtain the highest yield of each bioproduct.
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Affiliation(s)
- Antonio Lama-Muñoz
- Department of Chemical, Environmental and Materials Engineering, University of Jaén, Campus Las Lagunillas, s/n, Building B3, 23071 Jaén, Spain.
| | - María Del Mar Contreras
- Department of Chemical, Environmental and Materials Engineering, University of Jaén, Campus Las Lagunillas, s/n, Building B3, 23071 Jaén, Spain
| | - Francisco Espínola
- Department of Chemical, Environmental and Materials Engineering, University of Jaén, Campus Las Lagunillas, s/n, Building B3, 23071 Jaén, Spain
| | - Manuel Moya
- Department of Chemical, Environmental and Materials Engineering, University of Jaén, Campus Las Lagunillas, s/n, Building B3, 23071 Jaén, Spain
| | - Inmaculada Romero
- Department of Chemical, Environmental and Materials Engineering, University of Jaén, Campus Las Lagunillas, s/n, Building B3, 23071 Jaén, Spain
| | - Eulogio Castro
- Department of Chemical, Environmental and Materials Engineering, University of Jaén, Campus Las Lagunillas, s/n, Building B3, 23071 Jaén, Spain
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Britton J, Davis R, O'Connor KE. Chemical, physical and biotechnological approaches to the production of the potent antioxidant hydroxytyrosol. Appl Microbiol Biotechnol 2019; 103:5957-5974. [PMID: 31177312 DOI: 10.1007/s00253-019-09914-9] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Revised: 05/13/2019] [Accepted: 05/15/2019] [Indexed: 12/12/2022]
Abstract
Hydroxytyrosol (HT) is a polyphenol of interest to the food, feed, supplements and pharmaceutical sectors. It is one of the strongest known natural antioxidants and has been shown to confer other benefits such as anti-inflammatory and anti-carcinogenic properties, and it has the potential to act as a cardio- and neuroprotectant. It is known to be one of the compounds responsible for the health benefits of the Mediterranean diet. In nature, HT is found in the olive plant (Olea europaea) as part of the secoiridoid compound oleuropein, in its leaves, fruit, oil and oil production waste products. HT can be extracted from these olive sources, but it can also be produced by chemical synthesis or through the use of microorganisms. This review looks at the production of HT using plant extraction, chemical synthesis and biotechnological approaches.
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Affiliation(s)
- James Britton
- School of Biomolecular and Biomedical Science, University College Dublin, Belfield, Dublin 4, Ireland
| | - Reeta Davis
- School of Biomolecular and Biomedical Science, University College Dublin, Belfield, Dublin 4, Ireland
| | - Kevin E O'Connor
- School of Biomolecular and Biomedical Science, University College Dublin, Belfield, Dublin 4, Ireland. .,Beacon Bioeconomy Research Centre, University College Dublin, Belfield, Dublin 4, Ireland.
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Sygouni V, Pantziaros AG, Iakovides IC, Sfetsa E, Bogdou PI, Christoforou EA, Paraskeva CA. Treatment of Two-Phase Olive Mill Wastewater and Recovery of Phenolic Compounds Using Membrane Technology. MEMBRANES 2019; 9:membranes9020027. [PMID: 30764563 PMCID: PMC6410305 DOI: 10.3390/membranes9020027] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Revised: 01/10/2019] [Accepted: 01/26/2019] [Indexed: 11/16/2022]
Abstract
The semi-solid wastes (pomace or alperujo) produced in the two-phase olive oil extraction process contains extremely high organic load and phenolic substances. Efficient treatment of such kinds of wastes using membrane filtration, should be sought to reduce the hazardous effects to the environment. On the other hand, phenolic compounds can be isolated and purified up to a level of commercial exploitation using the membrane technology. Firstly, the extraction process with mixtures of water and ethanol was optimized by testing extraction parameters (e.g., solvent’s mixture, duration, and temperature) at laboratory scale. Next, extraction was conducted using larger volumes and the treatment was continued in a pilot membrane filtration system, consisted of ultrafiltration (UF), nanofiltration (NF) and reverse osmosis (RO) membranes. The extracted solution from the olive oil pomace was fed to the pilot membrane filtration system, where all fat, lipids, and solids were removed while the phenolic compounds were concentrated in the retentate streams of NF and/or RO. Total phenolic content (TPC) at the RO’s concentrate stream was 225 mg/L and at the final effluent was lower than 10 mg/lt. The chemical oxygen demand (COD) value at the final effluent was much lower (~280 mg/L) than in the feed stream (>32,000 mg/L).
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Affiliation(s)
- Varvara Sygouni
- Department of Chemical Engineering, University of Patras, GR-26504 Patras, Greece.
- Foundation for Research and Technology Hellas, Institute of Chemical Engineering Science, Stadiou Str., Platani, GR-26504 Patras, Greece.
| | - Alexis G Pantziaros
- Department of Chemical Engineering, University of Patras, GR-26504 Patras, Greece.
- Foundation for Research and Technology Hellas, Institute of Chemical Engineering Science, Stadiou Str., Platani, GR-26504 Patras, Greece.
| | - Iakovos C Iakovides
- Department of Chemical Engineering, University of Patras, GR-26504 Patras, Greece.
| | - Evangelia Sfetsa
- Department of Chemical Engineering, University of Patras, GR-26504 Patras, Greece.
| | - Polychronia I Bogdou
- Department of Chemical Engineering, University of Patras, GR-26504 Patras, Greece.
- Foundation for Research and Technology Hellas, Institute of Chemical Engineering Science, Stadiou Str., Platani, GR-26504 Patras, Greece.
| | - Emilia A Christoforou
- Department of Chemical Engineering, University of Patras, GR-26504 Patras, Greece.
- Foundation for Research and Technology Hellas, Institute of Chemical Engineering Science, Stadiou Str., Platani, GR-26504 Patras, Greece.
| | - Christakis A Paraskeva
- Department of Chemical Engineering, University of Patras, GR-26504 Patras, Greece.
- Foundation for Research and Technology Hellas, Institute of Chemical Engineering Science, Stadiou Str., Platani, GR-26504 Patras, Greece.
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