Xueqi Li, Lu Li, Andrew Blandino, Mary Mori, Christopher Moore, Alejandra Andalon, Selina C. Wang
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引用次数: 0
Abstract
The quality and shelf life of extra virgin olive oil (EVOO) are pivotal to its marketability and consumer satisfaction. This study evaluated how pyropheophytin a (PPP) and 1,2-diacylglycerols (DAGs) changed for different varieties of EVOO over a 24-month storage period under varying temperature conditions (16°C, 18°C, and 20°C). PPP values were primarily influenced by storage temperature, while DAGs evolution was driven by a combination of storage time, temperature, and initial free fatty acid levels. Both DAGs and PPP had weak correlations with quality and oxidative parameters like peroxide values (PV) and UV absorbances. Applying the current California olive oil standard thresholds (PPP ≤ 17% and DAGs ≥ 35%) ensured 100% specificity (i.e., no non-rancid oils were misclassified as rancid). While alternative thresholds (e.g., PPP ≤ 12% and DAGs ≥ 47%) improved sensitivity (the ability to correctly identify rancid oils) from 21% to 42%, their practical significance is limited due to compromised specificity (97%). Our findings demonstrated PPP and DAGs can accurately classify EVOO quality. Shelf-life prediction models incorporating these chemical parameters help better determine use-by dates, enhance consumer trust, and promote greater transparency and consistency in the global olive oil industry.
期刊介绍：
The Journal of the American Oil Chemists’ Society (JAOCS) is an international peer-reviewed journal that publishes significant original scientific research and technological advances on fats, oils, oilseed proteins, and related materials through original research articles, invited reviews, short communications, and letters to the editor. We seek to publish reports that will significantly advance scientific understanding through hypothesis driven research, innovations, and important new information pertaining to analysis, properties, processing, products, and applications of these food and industrial resources. Breakthroughs in food science and technology, biotechnology (including genomics, biomechanisms, biocatalysis and bioprocessing), and industrial products and applications are particularly appropriate.
JAOCS also considers reports on the lipid composition of new, unique, and traditional sources of lipids that definitively address a research hypothesis and advances scientific understanding. However, the genus and species of the source must be verified by appropriate means of classification. In addition, the GPS location of the harvested materials and seed or vegetative samples should be deposited in an accredited germplasm repository. Compositional data suitable for Original Research Articles must embody replicated estimate of tissue constituents, such as oil, protein, carbohydrate, fatty acid, phospholipid, tocopherol, sterol, and carotenoid compositions. Other components unique to the specific plant or animal source may be reported. Furthermore, lipid composition papers should incorporate elements of yeartoyear, environmental, and/ or cultivar variations through use of appropriate statistical analyses.
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