Please use this identifier to cite or link to this item:
https://hdl.handle.net/11499/46351
Title: | Comparison of the Oil Quality of Light and Dark Walnuts under Different Storage Conditions | Authors: | Yildiz, Aysun Yurdunuseven Karaca, Hakan |
Keywords: | pellicle color darkening ground walnut storage condition lipid oxidation Juglans-Regia L. Fatty-Acid Profile Oxidative Stability Antioxidant Activity Kernels Tocopherols Temperature Polyphenol Attributes Atmosphere |
Publisher: | Japan Oil Chemists Soc | Abstract: | The skin of the walnut kernels can get dark during the pre- and post-harvest stages of the production. Dark kernels are less palatable for most consumers but are still edible and maybe preferable, especially in the ground form, for industrial use. In this study, we investigated the differences between oil oxidation indexes, fatty acid and tocopherol compositions of the oils, total polyphenol contents and antioxidant capacities of the extracts of light and dark walnuts. In addition, we evaluated the effects of packaging under nitrogen and vacuum-packaging techniques and storage temperature on these characteristics of both light and dark walnuts during storage for 6 months. Peroxide values and free fatty acid contents of all samples were higher at the end of storage compared to initial values, being more noticeable at 20 degrees C than at 4 degrees C. Increases in the free fatty acid contents were quite higher in dark walnuts than the light ones (6.1 and 3.1 fold, respectively) and the highest values of conjugated diene and peroxide were determined in the samples packaged under air and stored at 20 degrees C. Dark walnuts had lower total phenolic, alpha- and gamma-tocopherol contents and antioxidant activities compared to the light ones. Total phenolic and tocopherol contents decreased over time. We conclude that due to the antioxidant compounds in the fruit, oxidation parameters of dark walnuts are still acceptable at the end of 6-month storage even in the packages with air and at non-refrigerated conditions. | URI: | https://doi.org/10.5650/jos.ess20266 http://acikerisim.pau.edu.tr:8080/xmlui/handle/11499/46351 |
ISSN: | 1345-8957 1347-3352 |
Appears in Collections: | Mühendislik Fakültesi Koleksiyonu PubMed İndeksli Yayınlar Koleksiyonu / PubMed Indexed Publications Collection Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection |
Files in This Item:
File | Size | Format | |
---|---|---|---|
70_ess20266.pdf | 1.48 MB | Adobe PDF | View/Open |
CORE Recommender
SCOPUSTM
Citations
7
checked on Oct 13, 2024
WEB OF SCIENCETM
Citations
6
checked on Oct 31, 2024
Page view(s)
80
checked on Aug 24, 2024
Download(s)
32
checked on Aug 24, 2024
Google ScholarTM
Check
Altmetric
Items in GCRIS Repository are protected by copyright, with all rights reserved, unless otherwise indicated.