Calcium Soap from Palm Fatty Acid Distillate for Ruminant Feed: Analysis of Product Quality (FTIR)

Lienda A. Handojo, Antonius Indarto, Dian Shofinita, Muhammad R. Saadi, Dea Yulistia, Fathinah I Hasyyati


As a lactating dairy cattle feed supplement, calcium soap gives energy in the form of protected fat and can increase milk production in dairy cattle. This well-known supplement can be produced using the modified fusion method by reacting PFAD with a calcium source. One procedure to measure the product quality is by quantifying the reaction conversion or the amount of unreacted free fatty acids. In this research, Fourier Transform Infrared (FTIR) spectroscopy analysis was used to identify the changes in chemical bonds of reactant (PFAD) and the product (calcium soap). FTIR results showed that the transmittance of the peak absorbance of water and free fatty acids (carboxylic acids) molecules were different in reactant compared to the product. For water molecules, O-H (wavenumber 3396-3411cm-1) and H-O-H (wavenumber 1616.88cm-1) functional groups were found in the product, but not in reactant. As for carboxylic acids molecules, C=O (wavenumber 1698.36cm-1) functional groups were found decreasing after the reaction. The transmission value for the C=O bond in the PFAD is 48%. Meanwhile, there is no transmission peak in product sample 2 (CS-2) and only 95% of transmission value for product sample 1 (CS-1). The lower transmittance of carboxylic acids functional groups was correlated with the higher calcium soap reaction conversion.

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