Process optimization for fish oil extraction from Greenland halibut (Reinardtius hippoglossoided ) fins

• Main Authors: Ya-Fen Lu, 呂雅芬
• Other Authors: Mei-Ling Tsai, Ph.D.
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/6s9dg8

碩士 === 國立高雄海洋科技大學 === 水產食品科學研究所 === 102 === Using the fins of Greenland halibut (Reinhardtius hippoglossoides) as raw material, this study aims to compare the methods of fish oil extraction, its processing conditions and its influence on the quality of the extracted fish oil. The process was achieved with initial softening of the fins with acid followed by hydrolysis under high temperature and high pressure to extract the fish oil. The parameters used to determine the best conditions for processing and manufacturing the by-products of fish oil are the fish oil extraction rate, quality of the oil through estimation of acid, peroxide, TBA and anisidine values, and the fatty acid composition, which are to be in compliance with the National Standards in its endeavour to improve the economical values of the Greenland halibut. Under the similar denominators of temperatures maintained at 121 ° C, water quantity fixed at 1.5 times the fins' mass and hydrolysis duration of 15 minutes, the extraction rate of the fins' oil was 20.79% and the residual rate was 27.04%. Theresults revealed that the hydrolyzed residual rate decreased as the concentration of the acids increased although the extraction rate did not increase correspondingly. Under the same conditions, citric acid, acetic acid, phosphoric acid hydrochloric acid were used at 2%, 4% and 8% for each. Among the four different types of acid used, citric acid at 4% yielded the best extraction rate of 38.29%, while 8% hydrochloric acid yielded the lowest at 1.45%. In addition, factors such as residual rate, peroxide values, acid values, TBA values and anisidine values of the refined by-products both pre and post acidification were taken into consideration and compared. In conclusion from the data postulated, the optimal conditions for extraction of Greenland halibut fins' fish oil is determined to be at 121 ℃, water quantity at 1.5 times the fins' mass, using 4% citric acid and hydrolysis duration of 15 minutes.