Effect of Sunlight, Incandescent, Fluorescent, and Ultraviolet Lights on the Oxidation of Edible Soybean Oil

식용유지(食用油脂)의 산화과정(酸化過程)에 대한 일사광선(日射光線), 백열등광선(白熱燈光線), 형광등광선(螢光燈光線) 및 살균등광선(殺菌燈光線)의 촉진작용(促進作俑) 대하여

  • Koo, Ja-Hyun (Department of Food Technology, College of Agriculture, Korea University) ;
  • Kim, Dong-Hoon (Department of Food Technology, College of Agriculture, Korea University)
  • 구자현 (고려대학교 농과대학 식품공학과) ;
  • 김동훈 (고려대학교 농과대학 식품공학과)
  • Published : 1971.12.28

Abstract

Samples of refined soybean oil were irradiated with lights from a 20-watt incandescent tungsten lamp, a 20-watt fluorescent daylight type lamp, a 20-watt low-pressure mercury vapor germicidal lamp, and direct sunlight for an experimental period of 147 days. Some samples were stored in a dark room throughout the period as a control. The peroxide values of all samples were measured every week. The induction period of the samples was arbitrarily taken as the time required for the samples to reach a peroxide value of 15. The induction period of the control was estimated at 198 days. Those of the samples irradiated with the incandescent light, the fluorescent light, the ultraviolet light, and the sunlight were estimated at 196, 119, 52 and 6 days, respectively. The sunlight showed by far the strongest prooxidant activity whereas the incandescent light showed the weakest but distinct prooxidant activity. The small temperature differences observed among the various samples throughout the experimental period did not seem to affect the oxidation rates of the irradiated samples in any significant way.

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