Abstract
Refined hoki oil (RHO) was fractionated to yield polyunsaturated fatty acids (PUFA)-rich fraction and a more solid fraction via dry fractionation (DF) and low-temperature solvent crystallisation (LTSC). Results showed that LTSC yielded a higher percentage (50 %) of the liquid fraction than the DF (30 %) method. The liquid fraction obtained via LTSC (RHO SCL) contains a higher percentage of PUFA (35.2 %) compared to RHO parent oil (28.8 %) and its solid fraction (24.4 %). The melting and crystallisation profiles of the liquid fractions obtained via DSC of LTSC and DF shifted to a lower temperature range than the RHO parent oil and its solid fractions. This may be explained by increased unsaturation in the liquid fractions. Both solid fractions of RHO have similar melting and crystallisation profiles to RHO parent oil. The melting and crystallisation enthalpies and solid fat content of the RHO SCL were lower than RHO parent oil and its solid fraction.
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