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An alternative to the conventional extraction method for the recovery of bioactive compounds from Bentong ginger
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1  Faculty of Food Science and Technology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
Academic Editor: Moktar Hamdi

Abstract:

Recently, there has been a shift in utilizing Supercritical Carbon Dioxide (scCO2) as a ‘green solvent’ for extraction instead of conventional extraction due to the large consumption of hazardous organic solvents and of energy, which contributes significantly to environmental problems. The unique properties of supercritical conditions, including high diffusivity, low density, and the easy tuneability of conditions even at mild temperatures have made scCO2 popular in the industry. The main objective of this study is to compare the yield extracts and bioactive compound recovery from Bentong ginger (Zingiber officinale Roscoe var. bentong) between Soxhlet and the scCO2 extraction method. Extraction using scCO2 was carried out at a pressure of 25 MPa, temperature of 40 °C, and a particle size of 300 m. Both methods were used to analyse the content of the compound 6-gingerol, total phenolic content, total flavonoid content, and antioxidant activity using 2,2-diphenyl-1-picrylhydrazyl (DPPH). The highest yield extract, 4.76±0.08 %, was achieved using the Soxhlet method. Nevertheless, the unique properties of scCO2, such as high diffusivity, low density, and ability to be operated at mild conditions, promote its advantages in the extraction of bioactive compounds, whereby all bioactive compounds recovered using scCO2 were higher than those recovered using the Soxhlet method. This shows the effectiveness of scCO2 as an extraction tool for recovering bioactive compounds compared to the Soxhlet method.

Keywords: Soxhlet extrcation; Green technology: Supercritical carbon dioxide; Bentong ginger: Bioactive compounds

 
 
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