Determination of dragon fruit peel extract stability
Stability of dragon fruit peel extract (control) and the extract added with betel nut or ginger extract was performed by placing the 3 sample extracts under various conditions including 4°C dark, 4°C light, room temperature dark and room temperature light. All sample extracts were analyzed for their pH, color, EPC and antioxidant during 93 days storage. The pH and color was determined by pH meter and chromameter with CIE L*a*b* parameters system, respectively. The ∆E* values were calculated and expressed as color change result.