Innovation of Propolis Extraction Machine Based on Vacuum Resistive Heating

Abstract

In herbal medicine production, extraction technology is an important process because it determines the quality. The extraction of propolis is limited to conventional maceration method which the process is too long. New technology called vacuum resistive heating extraction is technology that utilizes electric current combine with vacuum condition, it has been applied to Makassar propolis extraction, dehydration, evaporation and distillation. This study used method as variations. The extraction process was carried out 20 minutes in two stages. The first process was at 16.6 KPa, 100V and 58 C using water solvent. While the second process was using 70% ethanol solvent at 16.6 KPa, 220V, and 37 C. The voltage gradient used in energy consumption analysis is 40 V/cm and 80 V/cm. The power delivered and temperature rate were analysed using 25V/cm, 30 V/cm, and 35V/cm. The results showed that the extraction machine ran well where the electric field affects heat rate of the material. Energy consumption in the process was 0.4225 kWh/L. The highest total phenol and flavonoid in VRH method were 45.72 mg GAE/g and 15.19 mg QE/g whereas higher than maceration method. Vacuum resistive heating as extraction machine is a promising way for aseptically producing herbal medicine especially propolis.