Effect of Drying Methods on Antioxidant and Antibacterial Properties of Alpinia Galanga

Lee, Khai Wey (2019) Effect of Drying Methods on Antioxidant and Antibacterial Properties of Alpinia Galanga. Final Year Project (Bachelor), Tunku Abdul Rahman University College.

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Abstract

Alpinia galanga is an important medicinal plant that serve as a source of natural antioxidant and antibacterial. This study aimed to study the effects of drying methods on antioxidant and antibacterial properties of developed Alpinia galanga powder. The sample was dried by using freeze drying at -55℃ for 24 hours, sun drying for 3 days, vacuum oven drying at 50℃ for 24 hours and hot air oven drying at 50℃ for 24 hours to obtain Alpinia galanga powder. The samples were evaluated for antioxidant properties including Total Phenolic Content (TPC), Total Flavonoid Content (TFC), 2,2-Diphenyl- 1-picrylhydrazyl (DPPH), Ferric Reducing Antioxidant Power (FRAP) and Vitamin C. Antibacterial properties of samples were evaluated using Disc Diffusion Test against Escherichia coli and Staphylococcus aureus. In this study, the highest TPC (305.86 ± 0.779 mg GAE/100g) and TFC (129.83 ± 0.415 mg CAE/100g) were achieved in vacuum oven drying sample. Vacuum drying sample also showed the highest DPPH radical scavenging activity (74.54±0.529%) and the highest ferric reducing antioxidant power (FRAP) (26.35±0.110