Valorization of Olive Leaf Polyphenols by Green Extraction and Selective Adsorption on Biochar Derived from Grapevine Pruning Residues
Given today’s increasingly intensive agriculture, one key problem area considers the valorization and reuse of wastes from food and agricultural production with minimal impact on the environment. Due to its physicochemical characteristics, biochar (BC) derived from grapevine pruning residue has show...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-12-01
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| Series: | Antioxidants |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2076-3921/13/1/1 |
| _version_ | 1797344763804909568 |
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| author | Melissa Prelac Nikola Major Danko Cvitan Dominik Anđelini Maja Repajić Josip Ćurko Tvrtko Karlo Kovačević Smiljana Goreta Ban Zoran Užila Dean Ban Igor Palčić |
| author_facet | Melissa Prelac Nikola Major Danko Cvitan Dominik Anđelini Maja Repajić Josip Ćurko Tvrtko Karlo Kovačević Smiljana Goreta Ban Zoran Užila Dean Ban Igor Palčić |
| author_sort | Melissa Prelac |
| collection | DOAJ |
| description | Given today’s increasingly intensive agriculture, one key problem area considers the valorization and reuse of wastes from food and agricultural production with minimal impact on the environment. Due to its physicochemical characteristics, biochar (BC) derived from grapevine pruning residue has shown considerable potential for use as an adsorbent. High-value phytochemicals found in abundance in the olive leaf (OL) can be employed in many different industrial sectors. The potential application of BC in the removal of specific polyphenolic components from OL extracts has been investigated in the present study. Water, as the most available and greenest of solvents, was investigated as to its use in the extraction of polyphenols, which was carried out by comparing maceration, ultrasound-assisted extraction, and microwave-assisted extraction, considering different temperatures and solid-to-liquid (s/l) ratios. The BC adsorption capacity of selected polyphenols was fitted with both the Langmuir and Freundlich isotherm models. The Freundlich model fitted better relative to OL polyphenols adsorption. Oleuropein was the most abundant compound identified in the extracts, obtaining the highest K<sub>f</sub> value (20.4 (mg/g) × (L/g)<sup>n</sup>) and R<sup>2</sup> coefficient (0.9715) in the adsorption on the biochar’s surface. The optimum conditions in the dosage experiment suggest the use of 0.5 g of BC using 3 g/L extracts, with an exception for oleuropein and hydroxytyrosol, for which the highest biochar dose (2.5 g) performed better. Considering the compounds’ concentrations and the BC dose, BC from grapevine pruning residues demonstrated a potential use in the uptake of specific polyphenols from olive leaves, making it a promising adsorbent for such applications. |
| first_indexed | 2024-03-08T11:07:28Z |
| format | Article |
| id | doaj.art-a20ee890d0a94d9687c5bc68699a665d |
| institution | Directory Open Access Journal |
| issn | 2076-3921 |
| language | English |
| last_indexed | 2024-03-08T11:07:28Z |
| publishDate | 2023-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Antioxidants |
| spelling | doaj.art-a20ee890d0a94d9687c5bc68699a665d2024-01-26T14:39:09ZengMDPI AGAntioxidants2076-39212023-12-01131110.3390/antiox13010001Valorization of Olive Leaf Polyphenols by Green Extraction and Selective Adsorption on Biochar Derived from Grapevine Pruning ResiduesMelissa Prelac0Nikola Major1Danko Cvitan2Dominik Anđelini3Maja Repajić4Josip Ćurko5Tvrtko Karlo Kovačević6Smiljana Goreta Ban7Zoran Užila8Dean Ban9Igor Palčić10Institute of Agriculture and Tourism, Karla Huguesa 8, 52440 Poreč, CroatiaInstitute of Agriculture and Tourism, Karla Huguesa 8, 52440 Poreč, CroatiaInstitute of Agriculture and Tourism, Karla Huguesa 8, 52440 Poreč, CroatiaInstitute of Agriculture and Tourism, Karla Huguesa 8, 52440 Poreč, CroatiaDepartment of Food Engineering, University of Zagreb, Faculty of Food Technology and Biotechnology, Pierottijeva 6, 10000 Zagreb, CroatiaDepartment of Food Engineering, University of Zagreb, Faculty of Food Technology and Biotechnology, Pierottijeva 6, 10000 Zagreb, CroatiaInstitute of Agriculture and Tourism, Karla Huguesa 8, 52440 Poreč, CroatiaInstitute of Agriculture and Tourism, Karla Huguesa 8, 52440 Poreč, CroatiaInstitute of Agriculture and Tourism, Karla Huguesa 8, 52440 Poreč, CroatiaInstitute of Agriculture and Tourism, Karla Huguesa 8, 52440 Poreč, CroatiaInstitute of Agriculture and Tourism, Karla Huguesa 8, 52440 Poreč, CroatiaGiven today’s increasingly intensive agriculture, one key problem area considers the valorization and reuse of wastes from food and agricultural production with minimal impact on the environment. Due to its physicochemical characteristics, biochar (BC) derived from grapevine pruning residue has shown considerable potential for use as an adsorbent. High-value phytochemicals found in abundance in the olive leaf (OL) can be employed in many different industrial sectors. The potential application of BC in the removal of specific polyphenolic components from OL extracts has been investigated in the present study. Water, as the most available and greenest of solvents, was investigated as to its use in the extraction of polyphenols, which was carried out by comparing maceration, ultrasound-assisted extraction, and microwave-assisted extraction, considering different temperatures and solid-to-liquid (s/l) ratios. The BC adsorption capacity of selected polyphenols was fitted with both the Langmuir and Freundlich isotherm models. The Freundlich model fitted better relative to OL polyphenols adsorption. Oleuropein was the most abundant compound identified in the extracts, obtaining the highest K<sub>f</sub> value (20.4 (mg/g) × (L/g)<sup>n</sup>) and R<sup>2</sup> coefficient (0.9715) in the adsorption on the biochar’s surface. The optimum conditions in the dosage experiment suggest the use of 0.5 g of BC using 3 g/L extracts, with an exception for oleuropein and hydroxytyrosol, for which the highest biochar dose (2.5 g) performed better. Considering the compounds’ concentrations and the BC dose, BC from grapevine pruning residues demonstrated a potential use in the uptake of specific polyphenols from olive leaves, making it a promising adsorbent for such applications.https://www.mdpi.com/2076-3921/13/1/1adsorptionbioactive compoundsgreen extractionsustainable agriculturewaste management |
| spellingShingle | Melissa Prelac Nikola Major Danko Cvitan Dominik Anđelini Maja Repajić Josip Ćurko Tvrtko Karlo Kovačević Smiljana Goreta Ban Zoran Užila Dean Ban Igor Palčić Valorization of Olive Leaf Polyphenols by Green Extraction and Selective Adsorption on Biochar Derived from Grapevine Pruning Residues Antioxidants adsorption bioactive compounds green extraction sustainable agriculture waste management |
| title | Valorization of Olive Leaf Polyphenols by Green Extraction and Selective Adsorption on Biochar Derived from Grapevine Pruning Residues |
| title_full | Valorization of Olive Leaf Polyphenols by Green Extraction and Selective Adsorption on Biochar Derived from Grapevine Pruning Residues |
| title_fullStr | Valorization of Olive Leaf Polyphenols by Green Extraction and Selective Adsorption on Biochar Derived from Grapevine Pruning Residues |
| title_full_unstemmed | Valorization of Olive Leaf Polyphenols by Green Extraction and Selective Adsorption on Biochar Derived from Grapevine Pruning Residues |
| title_short | Valorization of Olive Leaf Polyphenols by Green Extraction and Selective Adsorption on Biochar Derived from Grapevine Pruning Residues |
| title_sort | valorization of olive leaf polyphenols by green extraction and selective adsorption on biochar derived from grapevine pruning residues |
| topic | adsorption bioactive compounds green extraction sustainable agriculture waste management |
| url | https://www.mdpi.com/2076-3921/13/1/1 |
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