Performance evaluation of pectin extraction from grapefruit peel powder by ohmic heating

Abstract

This study is to investigate the performance properties during the extraction of pectin from grapefruit peel powder using ohmic heating. Pectin extraction was carried out under different voltage gradients (7-11 V/cm), different solid:liquid ratios (1:20-1:60), and different holding times (0-180 min) at constant pH and temperature (80°C). The voltage gradient and solid:liquid ratio affected the time to reach the target temperature. The highest energy efficiency value for all voltage gradients and solid:liquid ratios were obtained in the 0 minutes holding time, and the efficiency value, which changed between 89.47-56.02%, was negatively affected by the increase in the holding time. The exergy efficiency was lower than the energy efficiency and decreased due to the increasing holding time and decreasing voltage gradient. Also, the exergy efficiency was found to be between 73.69-18.09%. Determining the performance characteristics of the system will make a significant contribution to pilot and industrial-scale system/process applications for future.