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Fatty Acid Modifications and Cholesterol Oxidation in Pork Loin during Frying at Different Temperatures

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The effect of frying with sunflower oil for 4 min at different temperatures (160, 170, and 180°C) on fatty acids and cholesterol of pork loin meat was studied. Total fat content increased from 5.6% in fresh loin to 7.3, 7.8, and 12.1% at 160, 170, and 180°C, respectively. Interactions with culinary fat gave rise to a significant increase in unsaturated acids/saturated acids and polyunsaturated acids/saturated acids ratios, which could be considered an advantage from a nutritional point of view. Less than 1 ppm (μg/g of sample) of cholesterol oxidation products was detected in fresh loin, whereas fried loin pork contained between 8.58 and 10.89 ppm. 7-Ketocholesterol (5.99 to 8.47 ppm in fried samples) and 7β-hydroxycholesterol (1.43 to 2.55 ppm in fried samples) were the main cholesterol oxidation products. Cholestanetriol was not detected in any sample, and small quantities of 25-hydroxycholesterol and 5,6α-epoxycholesterol were found in the fried sample.


Document Type: Research Article

Affiliations: Departamento de Bromatología, Toxicología y Tecnología de Alimentos, Facultad de Farmacia, Universidad de Navarra, 31080-Pamplona, Spain

Publication date: July 1, 2001

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