The Changes of Lipid Oxidation and Fatty Acid Composition of Extruded Pellet Feed by Dietary Moisture Level and Storage Temperature

수분함량과 저장온도에 따른 배합사료의 지방산화 및 지방산 조성 변화

  • Jang, Mi-Soon (Aquafeed Research Center, National Fisheries Research & Development Institute) ;
  • Kim, Kyoung-Duck (Aquafeed Research Center, National Fisheries Research & Development Institute) ;
  • Kim, Kang-Woong (Aquafeed Research Center, National Fisheries Research & Development Institute) ;
  • Lee, Jong-Yun (Aquafeed Research Center, National Fisheries Research & Development Institute) ;
  • Kang, Yong-Jin (Aquafeed Research Center, National Fisheries Research & Development Institute)
  • 장미순 (국립수산과학원 양식사료연구센터) ;
  • 김경덕 (국립수산과학원 양식사료연구센터) ;
  • 김강웅 (국립수산과학원 양식사료연구센터) ;
  • 이종윤 (국립수산과학원 양식사료연구센터) ;
  • 강용진 (국립수산과학원 양식사료연구센터)
  • Published : 2008.11.25

Abstract

This study investigated the effects of dietary moisture level and storage temperature on lipid oxidation and fatty acids composition of the extruded pellet feed. The diets containing the moisture levels of 5%, 15% and 25% were prepared by adding moisture (water) to the commercial extruded pellets and stored at $5^{\circ}C$, $20^{\circ}C$ (room temperature) and $35^{\circ}C$. The samples for analysis were collected at every 2 days for 10 days. Acid value (AV), peroxide value (POV), 2-thiobarbituric acid (TBA) value and fatty acid composition of the feeds were measured. No differences in the AV, POV and TBA value were observed in feed containing 5% moisture at all storage temperatures for 10 days. However, the AV, POV and TBA value of diets containing 15% and 25% moisture increased rapidly at $20^{\circ}C$ and $35^{\circ}C$ after 4 days. Fatty acids compositions of feeds containing 5% moisture did not change during the storage periods at $5^{\circ}C$ and $20^{\circ}C$. However, 5% moisture feed stored at $35^{\circ}C$ increased monoene fatty acid content and decreased the contents of polyene fatty acid, PUFA (polyunsaturated fatty acid)/SFA (saturated fatty acid) and $(C_{20:5}+C_{22:6})/C_{16:0}$ after 4 days. Also, 15% moisture feed stored at $35^{\circ}C$ showed increased monoene fatty acid content and decreased $(C_{20:5}+C_{22:6})/C_{16:0}$ after 2 days. The diet containing 25% moisture showed increased monoene fatty acid content and decreased contents of PUFA, PUFA/SFA and $(C_{20:5}+C_{22:6})/C_{16:0}$ at all temperatures after 2 days. In this study, lipid oxidation can occur in the extruded pellet feeds of 15% and 25% moisture at room temperature after 2 days.

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