{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T01:36:18Z","timestamp":1760060178925,"version":"build-2065373602"},"reference-count":66,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2025,8,7]],"date-time":"2025-08-07T00:00:00Z","timestamp":1754524800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001871","name":"Funda\u00e7\u00e3o para a Ci\u00eancia e Tecnologia (FCT)","doi-asserted-by":"publisher","award":["2021.06088.BD","UIDB\/00681"],"award-info":[{"award-number":["2021.06088.BD","UIDB\/00681"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]},{"name":"European Social Fund of the European Union","award":["2021.06088.BD","UIDB\/00681"],"award-info":[{"award-number":["2021.06088.BD","UIDB\/00681"]}]},{"DOI":"10.13039\/501100001871","name":"National Funds","doi-asserted-by":"publisher","award":["2021.06088.BD","UIDB\/00681"],"award-info":[{"award-number":["2021.06088.BD","UIDB\/00681"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Crops"],"abstract":"<jats:p>Hazelnut is an important crop worldwide, and the characteristics of the fruits are quite variable according to a number of factors, including variety and cultivation conditions, which in turn can vary according to harvest year. This study aimed to investigate some physical and chemical characteristics of three hazelnut varieties grown in Portugal (Grada de Viseu, Tonda di Giffoni and Butler) along two different harvesting years (2021 and 2022). Also, the microbial quality was investigated for its relevance to the conservation of the fruits. The physical properties evaluated were biometric characteristics and colour, the chemical components analysed were moisture, lipids, protein, ash and fibre, and the microbial properties investigated were the microorganisms, moulds and yeasts. The results showed that, generically, statistically significant differences were found between the three varieties under study on several properties investigated. The kernel was confirmed as the lighter part of all hazelnuts, and when comparing between varieties, Tonda di Giffoni presented the lighter fruits in both harvesting years. With respect to weight, the Tonda di Giffoni variety was the lightest in both harvest years. Moisture content was observed to be higher than the recommended limits for two of the samples (Grada de Viseu in 2021: 6.01 \u00b1 0.26 g\/100 g and Butler in 2022: 6.02 \u00b1 0.37 g\/100 g), although the difference was marginal given that the recommended limit is 6%. Not surprisingly, lipids were the major chemical component, ranging from 66.46 \u00b1 1.67 to 70.14 \u00b1 1.75 g\/100 g in 2021 and from 64.38 \u00b1 1.67 to 77.77 g\/100 g in 2022. It was further observed that the three varieties presented a satisfactory microbiological quality. Finally, applying factor analysis with principal components and Varimax rotation, a solution that explains 92.8% of the variance was obtained. This study provided information that is relevant for the characterisation and evaluation of variability according to the year of hazelnuts of three varieties cultivated in Portugal.<\/jats:p>","DOI":"10.3390\/crops5040053","type":"journal-article","created":{"date-parts":[[2025,8,7]],"date-time":"2025-08-07T09:25:52Z","timestamp":1754558752000},"page":"53","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Physicochemical and Microbiological Properties of Hazelnuts from Three Varieties Cultivated in Portugal"],"prefix":"10.3390","volume":"5","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3337-9139","authenticated-orcid":false,"given":"Ana Cristina","family":"Ferr\u00e3o","sequence":"first","affiliation":[{"name":"CERNAS-IPV Research Centre, Polytechnic Institute of Viseu, 3504-510 Viseu, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0595-6805","authenticated-orcid":false,"given":"Raquel P. F.","family":"Guin\u00e9","sequence":"additional","affiliation":[{"name":"CERNAS-IPV Research Centre, Polytechnic Institute of Viseu, 3504-510 Viseu, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1761-7376","authenticated-orcid":false,"given":"Marco","family":"Silva","sequence":"additional","affiliation":[{"name":"LAQV\/REQUIMTE, NOVA School of Science and Technology, 2829-516 Caparica, Portugal"}]},{"given":"Arminda","family":"Lopes","sequence":"additional","affiliation":[{"name":"Direc\u00e7\u00e3o Regional de Agricultura e Pescas do Centro, 3504-504 Viseu, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2023-4475","authenticated-orcid":false,"given":"Paula M. R.","family":"Correia","sequence":"additional","affiliation":[{"name":"CERNAS-IPV Research Centre, Polytechnic Institute of Viseu, 3504-510 Viseu, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2025,8,7]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"17","DOI":"10.12944\/CRNFSJ.7.1.03","article-title":"Hazelnuts as Source of Bioactive Compounds and Health Value Underestimated Food","volume":"7","author":"Nunzio","year":"2019","journal-title":"Curr. Res. Nutr. Food Sci. J."},{"key":"ref_2","unstructured":"FAOSTAT (2022, March 15). Crops and Livestock Products\u2014Hazelnut. Available online: https:\/\/www.fao.org\/faostat\/en\/#data\/QCL\/metadata."},{"key":"ref_3","doi-asserted-by":"crossref","unstructured":"Nayik, G.A., and Gull, A. (2020). Hazelnut. 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