Abstract
Low-fat bread spreads have become very popular since conventional spreads have been shown to be unhealthy due to high amounts of saturated fat and trans fatty acids. Two interesterified products, sample 16 (4% Thermomyces lanuginosus lipozyme, 4:1 molar ratio of chicken fat to corn oil and 42 h of interesterification at 50oC) and sample 17 (4% lipozyme, 2:1 molar ratio of chicken fat to corn oil and 42 h of interesterification at 30oC), were selected that had the highest Solid Fat Content (SFC) at 30oC. Both the samples contained high proportions of low melting triglycerides, which explains the lower melting temperatures (sample 16, -37.45oC to 31.40oC; sample 17, -39.78oC to 35.4oC) and crystallization temperatures (sample 16, 0.58°C to -38.90oC; sample 17, -2.45oC to -34.27oC for sample 17) and solid fat content (sample 16, 3.2% at 20oC; sample 17, 3.5% at 20oC). The enzymatic process caused the Free Fatty Acid (FFA) values to increase from 0.13-0.48% (sample 16) and 0.16-0.66% (sample 17). The final product (sample 16) had a smaller and less dense fat particle and is a low-cost alternative for soft spreads. The crystallization and melting properties of blends of chicken fat and corn oil result in a product that has a wide plastic range but still contains an unsaturated fatty acid content nearly equal to those based on plan t sources.
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