Optimization of drying temperature and vacuum pressure on the decoloration and composition crude fish oil
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The objective of this study was to determine the optimal parameters of decolorization of crude oil to obtain a semi-refined fish oil of acceptable quality; response surface methodology was used, considering a central composite design with two factors: Vacuum pressure (0.13-0.7 bar) and drying temperature (96-124 degrees C); having as dependent variables the percentage of free fatty acids (% AGL) and color of the oil. The raw material and the optimum finished product were characterized physico-chemically, which was obtained under the operating conditions: drying temperature of 110 degrees C and 0.13 bar vacuum. The finished product indicated a percentage of free fatty acids of 0.27 +/- 0.01% and CieLab colour with coordinates L: 48.69 +/- 0.88, a: -4.28 +/- 0.26 and b: 35.03 +/- 0.85, which Is equivalent to color 6 - 7 in Gardner scale, compliance with the industrial specifications.