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Message definition (Fatty acid ) ===Auto-oxidation and rancidity=== {{Main|Rancidification}} Unsaturated fatty acids and their esters undergo [[auto-oxidation]], which involves replacement of a C-H bond with C-O bond. The process requires oxygen (air) and is accelerated by the presence of traces of metals, which serve as catalysts. Doubly unsaturated fatty acids are particularly prone to this reaction. Vegetable oils resist this process to a small degree because they contain antioxidants, such as [[tocopherol]]. Fats and oils often are treated with [[chelation|chelating agents]] such as [[citric acid]] to remove the metal catalysts.
自動酸化と腐敗
不飽和脂肪酸とそのエステルは、C-H結合がC-O結合に置き換わる自動酸化 を受ける。このプロセスは酸素(空気)を必要とし、触媒となる微量の金属の存在によって促進される。二重不飽和脂肪酸は特にこの反応を起こしやすい。 植物油にはトコフェロール などの抗酸化物質が含まれているため、この反応に多少なりとも抵抗する。油脂はしばしばクエン酸 などのキレート剤 で処理され、金属触媒を除去する。