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• W2041159520 abstract "This study investigated the classification of olive oils that are mainly distributed in Korea via imports. The fatty acid contents, degree of color, pigments, anti-oxidants, and sterol contents are analyzed on the different types of olive oil as follows: 10 kinds of extra virgin olive oil, 5 kinds of pure olive oil, and 5 kinds of refined olive-pomace oil. As a result of fatty acid analysis, the majority of oleic acid (<TEX>$C_{18:1}$</TEX>) and palmitic acid (<TEX>$C_{16:0}$</TEX>), and minority of linoleic acid (<TEX>$C_{18:2}$</TEX>) and stearic acid (<TEX>$C_{18:0}$</TEX>) were detected without any significant differences between the grades of olive oils. The UV spectrum is related to the <TEX>${Delta}K$</TEX>, and it is a part of the analysis factor for the purity and degree of degradation of the oil. Extra virgin olive oil had <TEX>${Delta}K$</TEX> of almost 0, pure olive oil had 0.07~0.12, and refined olive-pomace oil had 0.1~0.13. These differed from extra virgin oil, and the pure or pomace oil <TEX>${Delta}K$</TEX> had a confirmed distinct difference. The color degrees of chlorophyll with a low <TEX>$L^*$</TEX> value and <TEX>$(-)a^*$</TEX> (green) and carotenoid with <TEX>$(+)b^*$</TEX> (yellow) were confirmed to have correlation between extra virgin and other olive oils. To compare chlorophyll and carotenoid as natural pigment in olive oils, 417 nm and the ratio of the absorbance at 480 nm (417/480) was calculated at 1.62 of extra virgin, 1.85 of pure olive oil, and 3.32 of refined olive-pomace oil. Therefore, it will be possible to distinguish when the extra virgin or pure olive oil are mixed with olive-pomace oil. The total amount of tocopherol, an anti-oxidant, were 19.06 in extra virgin, 10.91 in pure olive oil, and 27.88 in refined olive-pomace oil. The high content of tocopherol in pomace oil caused recovery of solvent extraction from olive pulp. Thus, extra virgin oil and pure olive oil were distinguished by olive-pomace oil. Polyphenol compounds in extra virgin olive oil measured high only in ferulic acid with 0.543 mg/kg, caffeic acid with 0.393 mg/kg, and other vanillic acid, vanillin, and p-coumaric acid had similar amount of 0.3 mg/kg. All grade of olive oils had the highest <TEX>${beta}$</TEX>-sitosterol content. Af (Authenticity factor) value were estimated with campesterol and stigmasterol content ratio (%). Af value was 19.2 in extra virgin olive oil, 17.1 in pure olive oil, 16.9 in refined olive-pomace oil, which were distinctive from sunflower oil with 3.7, corn oil with 2.4, and soybean oil with 2.0. It can provide important indicator of olive oil adulteration with other cheap vegetable oils. The results of this study can be used as a database for the classification of olive oil grade and distinguishing between the different types of oils." @default.
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• W2041159520 date "2014-06-30" @default.
• W2041159520 modified "2023-09-25" @default.
• W2041159520 title "A Study on the Classifying Quality Standard by Comparison with Physicochemical Characteristics of Virgin, Pure, Pomace Olive Oil" @default.
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• W2041159520 doi "https://doi.org/10.9799/ksfan.2014.27.3.339" @default.
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