Abstract #M116

# M116
Effect of cavitation and nanofiltration temperature on the functionality of MPC80.
A. Mishra*1, L. Metzger1, 1South Dakota State University, Brookings, SD.

Nanofiltration (NF) is typically utilized during MPC manufacture to concentrate ultrafiltration retentate before drying. In related research we determined that increasing the NF temperature from 22°C to 50°C and use of hydrodynamic cavitation (HC) improved nanofiltration performance and increased the level of total solids that can be achieved. In this study 3 replicates of 4 different NF retentates were spray dried and the functionality of the dried MPC was evaluated. The NF treatments utilized were: NF at 22°C (NF22); NF at 50°C (NF50); HC before NF at 22°C (HCNF22); and HC before NF at 50°C (HCNF50). All samples were spray dried using a pilot scale dryer (Niro dryer Model 1, Niro Inc., Columbia) using air atomizing-flat spray nozzle (SUE15A, external mix) with an inlet and outlet temperature 170°C and 85°C respectively. The powders produced were analyzed for physicochemical and functional quality. The moisture content of all powders was below 5% and the protein and ash content ranged from 79.81 to 81.29% and 7.23–7.35% respectively. The loose bulk density was 353, 332, 358, and 323 Kg/m3 and the tapped bulk density was 454, 428, 456, and 421Kg/m3 respectively for the NF22, NF50, HCNF22, and HCNF50 treatments. The loose and tapped bulk density was significantly (P < 0.05) higher in treatments NF at 22°C, whereas HC did not have a significant (P > 0.05) impact on loose or tapped bulk density. There were no significant differences in solubility at 22°C or 50°C or wetting time at 22°C; however, HC significantly (P < 0.05) decreased the wetting time at 50°C. There were no significant (P > 0.05) differences in emulsification capacity, emulsion stability, or foam stability, whereas foam capacity was significantly higher in the treatments that were nanofiltered at 50°C. The rennet coagulation time significantly (P < 0.05) increased and the heat coagulation time significantly (P < 0.05) decreased in the treatments that were nanofiltered at 50°C. This study determined that NF temperature and HC have important effects on the functionality of dried MPC80 and can be utilized to adjust the functional characteristics of MPC80.

Key Words: MPC80, hydrodynamic cavitation, nanofiltration