Investigation of solubility of carbon dioxide in anhydrous milk fat by lab-scale manometric method

This study aims to examine the solubility of CO2in anhydrous milk fat (AMF) as functions of partial pressure, temperature, chemical composition and physical state of AMF. AMF was fractionated at 21 °C to obtain stearin and olein fractions. The CO2solubility was measured using a home-made experimental apparatus based on changes of CO2partial pressures. The apparatus was found to be reliable as the measured and theoretical values based on the ideal gas law were comparable. The dissolved CO2concentration in AMF increased with an increase in CO2partial pressure (0-101 kPa). The apparent CO2solubility coefficients (mol kg-1 Pa-1) in the AMF were 5.75 ± 0.16 × 10-7, 3.9 ± 0.19 × 10-7and 1.19 ± 0.14 × 10-7at 35, 24 and 4 °C, respectively. Higher liquid oil proportions resulted in higher CO2solubility in the AMF. There was insignificant difference in the dissolved CO2concentration among the AMF, stearin and olein fractions in their liquid state at 40 °C.