Abstract
Abstract1H NMR spectroscopy enables the selective analysis of castor oil polyethylene glycol or E484 – an emulsifier commonly used in animal feed. The specific chemical composition of castor oil and the chemical substructures after the reaction with ethylene oxide enables the detection of E484 types in raw materials as well as in finished products and its differentiation from other polyethylene glycol based emulsifier systems. The detailed analysis of the NMR signals and the corresponding integral ratios gives values for the mean ethylene glycol units per mol fatty acid and provides significant parameters for monitoring the reaction kinetics and the by‐product profile.
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