{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,19]],"date-time":"2026-03-19T06:11:55Z","timestamp":1773900715271,"version":"3.50.1"},"reference-count":58,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2025,10,9]],"date-time":"2025-10-09T00:00:00Z","timestamp":1759968000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Plano de Recupera\u00e7\u00e3o e Resili\u00eancia (PRR)","award":["PRR-C05-i03-I-000239"],"award-info":[{"award-number":["PRR-C05-i03-I-000239"]}]},{"name":"Plano de Recupera\u00e7\u00e3o e Resili\u00eancia (PRR)","award":["SAP4_Refa_BL_44_2024_9435"],"award-info":[{"award-number":["SAP4_Refa_BL_44_2024_9435"]}]},{"name":"Plano de Recupera\u00e7\u00e3o e Resili\u00eancia (PRR)","award":["SAP4_Refa_BL_18_2024"],"award-info":[{"award-number":["SAP4_Refa_BL_18_2024"]}]},{"name":"Plano de Recupera\u00e7\u00e3o e Resili\u00eancia (PRR)","award":["LA\/P\/0092\/2020"],"award-info":[{"award-number":["LA\/P\/0092\/2020"]}]},{"name":"Plano de Recupera\u00e7\u00e3o e Resili\u00eancia (PRR)","award":["UID\/04129\/2025"],"award-info":[{"award-number":["UID\/04129\/2025"]}]},{"name":"Funda\u00e7\u00e3o para a Ci\u00eancia e Tecnologia (FCT)","award":["PRR-C05-i03-I-000239"],"award-info":[{"award-number":["PRR-C05-i03-I-000239"]}]},{"name":"Funda\u00e7\u00e3o para a Ci\u00eancia e Tecnologia (FCT)","award":["SAP4_Refa_BL_44_2024_9435"],"award-info":[{"award-number":["SAP4_Refa_BL_44_2024_9435"]}]},{"name":"Funda\u00e7\u00e3o para a Ci\u00eancia e Tecnologia (FCT)","award":["SAP4_Refa_BL_18_2024"],"award-info":[{"award-number":["SAP4_Refa_BL_18_2024"]}]},{"name":"Funda\u00e7\u00e3o para a Ci\u00eancia e Tecnologia (FCT)","award":["LA\/P\/0092\/2020"],"award-info":[{"award-number":["LA\/P\/0092\/2020"]}]},{"name":"Funda\u00e7\u00e3o para a Ci\u00eancia e Tecnologia (FCT)","award":["UID\/04129\/2025"],"award-info":[{"award-number":["UID\/04129\/2025"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Environments"],"abstract":"<jats:p>Almond hulls and shells, the byproducts of the almond industry, were analyzed to assess their potential valorization pathways. Shells showed a higher content in lignin and polysaccharides, but very low levels of extractives and inorganics. Hull\u2019s high polar extractives fraction showed poor phenolic preponderance and antioxidant activity, but high sugar and mineral contents, and its lipophilic extracts were highly enriched in triterpenes (from 73.5% to 91.3%), while shells presented more fatty acids (27.4% to 34.2%) and sterols (17.4% to 29.1%). Shells exhibited much higher S\/G ratio (syringyl to guaiacyl units) in their lignin polymer (1.0 to 1.4), compared to hulls (0.5 to 0.6). After mineral analyses, hulls showed high amounts of potassium (3.7\u20134.9%). Fixed carbon content was similar for both materials, but shells showed a higher energetic content, ~20 MJ\/kg. Finally, both hulls and pellets increased the water holding capacity (WHC) of the soil by 50%, when added in weight percentages of 6.25% (hulls) and 25% (pellets). With these results, the range of possibilities for these waste materials is exciting: shells could be used to obtain hemicellulose oligosaccharides, while hulls could be used in sugar extraction for biotransformation or as a soil amendment.<\/jats:p>","DOI":"10.3390\/environments12100369","type":"journal-article","created":{"date-parts":[[2025,10,9]],"date-time":"2025-10-09T07:56:29Z","timestamp":1759996589000},"page":"369","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Harnessing and Evaluating Almond Hulls and Shells for Bio-Based Products"],"prefix":"10.3390","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-3133-997X","authenticated-orcid":false,"given":"Ana T.","family":"Caeiro","sequence":"first","affiliation":[{"name":"Centro de Estudos Florestais, Laborat\u00f3rio Associado TERRA, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0657-3638","authenticated-orcid":false,"given":"Ricardo A.","family":"Costa","sequence":"additional","affiliation":[{"name":"Centro de Estudos Florestais, Laborat\u00f3rio Associado TERRA, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5913-5976","authenticated-orcid":false,"given":"Duarte M.","family":"Neiva","sequence":"additional","affiliation":[{"name":"Centro de Estudos Florestais, Laborat\u00f3rio Associado TERRA, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017 Lisboa, Portugal"},{"name":"Linking Landscape, Environment, Agriculture and Food Research Centre, Laborat\u00f3rio Associado TERRA, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017 Lisboa, Portugal"}]},{"given":"J\u00e9ssica","family":"Silva","sequence":"additional","affiliation":[{"name":"Centro Nacional de Compet\u00eancias dos Frutos Secos, Edif\u00edcio do Brigantia EcoPark Av. Cidade de Le\u00f3n, n\u00ba506, 5300-358 Bragan\u00e7a, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2670-6207","authenticated-orcid":false,"given":"Rosalina","family":"Marr\u00e3o","sequence":"additional","affiliation":[{"name":"Centro Nacional de Compet\u00eancias dos Frutos Secos, Edif\u00edcio do Brigantia EcoPark Av. Cidade de Le\u00f3n, n\u00ba506, 5300-358 Bragan\u00e7a, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5215-785X","authenticated-orcid":false,"given":"Albino","family":"Bento","sequence":"additional","affiliation":[{"name":"Centro Nacional de Compet\u00eancias dos Frutos Secos, Edif\u00edcio do Brigantia EcoPark Av. Cidade de Le\u00f3n, n\u00ba506, 5300-358 Bragan\u00e7a, Portugal"}]},{"given":"Nuno","family":"Saraiva","sequence":"additional","affiliation":[{"name":"Veracruz, Rua Filarmonica Idanhense, 68, 6060-188 Castelo Branco, Portugal"}]},{"given":"Francisco","family":"Marques","sequence":"additional","affiliation":[{"name":"Veracruz, Rua Filarmonica Idanhense, 68, 6060-188 Castelo Branco, Portugal"}]},{"given":"Jorge","family":"Rebelo","sequence":"additional","affiliation":[{"name":"Veracruz, Rua Filarmonica Idanhense, 68, 6060-188 Castelo Branco, Portugal"}]},{"given":"Andr\u00e9","family":"Encarna\u00e7\u00e3o","sequence":"additional","affiliation":[{"name":"Veracruz, Rua Filarmonica Idanhense, 68, 6060-188 Castelo Branco, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3419-6075","authenticated-orcid":false,"given":"Jorge","family":"Gominho","sequence":"additional","affiliation":[{"name":"Centro de Estudos Florestais, Laborat\u00f3rio Associado TERRA, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017 Lisboa, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2025,10,9]]},"reference":[{"key":"ref_1","unstructured":"(2025, September 08). 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