Multistep Molecular Distillation for the Preparation of Glyceride-Type Fish Oil High in Omega-3 Polyunsaturated Fatty Acid by Enzymatic Transesterification

Autor: SHEN Linjie, LIN Rongfa, ZHANG Lianyue, FENG Chuanzhi, FU Hong
Jazyk: English<br />Chinese
Rok vydání: 2023
Předmět:
Zdroj: Shipin Kexue, Vol 44, Iss 20, Pp 79-86 (2023)
Druh dokumentu: article
ISSN: 1002-6630
DOI: 10.7506/spkx1002-6630-20230207-065
Popis: The separation of glyceride fish oil high in omega-3 polyunsaturated fatty acid (ω-3 PUFA) produced by multistage enzymatic transesterification was studied by multistep molecular distillation. Firstly, glycerides and by-products in the transesterification products were separated by primary molecular distillation. When the distillation pressure was 5 Pa, the distillation temperature was 140 ℃, the scraper speed was 240 r/min, and the feeding rate was 0.2 mL/min, the yield of the first-stage heavy phase was 47.13% and the content of ω-3 PUFA in it was 53.76%. Meanwhile, high-temperature gas chromatography (HTGC) and nuclear magnetic resonance hydrogen (1H-NMR) spectroscopy consistently showed that the heavy phase did not contain fish oil ethyl ester. Secondly, the ω-3 PUFA content of the light phase increased from 60.73% to 78.01% by molecular distillation at a distillation pressure of 5 Pa, a distillation temperature of 110 ℃, a scraper speed of 240 r/min, and a condensation temperature of 20 ℃. After conducting secondary enzymatic transesterification reaction and molecular distillation separation on the enriched first-stage light phase, the yield of the second-stage heavy phase was 78.01% and its ω-3 PUFA content was 51.38%. When the enrichment step was omitted, the content of ω-3 PUFA in the second-stage heavy phase was only 42.37%. Multistep molecular distillation combined with multistage enzymatic transesterification can be used to prepare glyceride-type fish oil products with different ω-3 PUFA contents, with maximal utilization of raw materials and by-products.
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