title: Effect of thermally oxidized oil and fasting status on the short-term digestibility of ketolinoleic acids and total oxidized fatty acids in rats.
abstract: Western diets contain substantial amounts of lipid oxidation products. The effects of fasting status and oil oxidation on short-term digestibility of oxidized fatty acids (ox-FA) and ketolinoleic acids (keto-LA) of sunflower oils were evaluated. Twelve rats were fasted overnight for 3 days, whereas another 12 rats had free access to diet. From day 4, and for 4 days, two groups of rats, nonfasted (NFT) and fasted (FT), received 1 g/100 g body weight of sunflower oil reused from 40 deep-frying processes, and two control groups of rats, nonfasted (NFC) and fasted (FC), received the same amount of fresh oil. Ox-FA and keto-LA were determined 5 h after the last administration in the various gastrointestinal compartments together with the intraintestinal MDA. Oil digestibility was highest in NFC and lowest in FT rats. NFT and FT rats had higher (at least P < 0.05) intraintestinal MDA, ox-FA, and keto-LA than NFC and FC; MDA and keto-LA concentrations correlated with each other (P < 0.05). Ox-FA and keto-LA levels found in the gastric lumen suggest that digestion contributes to the formation of these compounds. Total ox-FA and keto-LA were efficiently absorbed during the first 5 h after test oil administration, but poorly absorbed in the case of fresh oils. Oil alteration influenced the digestibility of these compounds more than fasting, although the digestibility of oxidized oil was significantly affected by fasting.
authors.affiliation: Departamento de Nutrición, Bromatología y Toxicología, Facultad de Farmacia, Universidad de Alcalá, Madrid, Spain.
authors.forename: Raul
authors.initials: R
authors.lastname: Olivero-David
authors.forename: Antonello
authors.initials: A
authors.lastname: Paduano
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Fogliano
authors.forename: Paola
authors.initials: P
authors.lastname: Vitaglione
authors.forename: Sara
authors.initials: S
authors.lastname: Bastida
authors.forename: María José
authors.initials: MJ
authors.lastname: González-Muñoz
authors.forename: Juana
authors.initials: J
authors.lastname: Benedí
authors.forename: Raffaele
authors.initials: R
authors.lastname: Sacchi
authors.forename: Francisco José
authors.initials: FJ
authors.lastname: Sánchez-Muniz
mesh_terms: D000818:Animals; D004063:Digestion; D004064:Digestive System / Q000378:metabolism*; D005215:Fasting / Q000378:metabolism*; D005227:Fatty Acids / Q000378:metabolism*; D006358:Hot Temperature; D006801:Humans; D008041:Linoleic Acids / Q000737:chemistry / Q000378:metabolism*; D023421:Models, Animal; D010084:Oxidation-Reduction; D010938:Plant Oils / Q000008:administration & dosage / Q000737:chemistry / Q000378:metabolism*; D051381:Rats; D017207:Rats, Sprague-Dawley; D000074242:Sunflower Oil
chemical_list: D005227:Fatty Acids; D008041:Linoleic Acids; D010938:Plant Oils; D000074242:Sunflower Oil