Kinetic Study on Chlorophyll and Antioxidant Activity from <i>Polyscias fruticosa</i> (L.) Harms Leaves via Microwave-Assisted Extraction

Abstract

Polyscias fruticosa (L.) leaves contain significant bioactive compounds with high antioxidant activity such as chlorophylls, total polyphenols, etc. but these have still been underutilized. In this study, the kinetics of chlorophyll and antioxidant activity extraction from P. fruticosa leaves by microwave-assisted extraction (MAE) were investigated. Microwave power was 300, 450, or 600 (W); the ratio of material/solvent varied from 1:40 to 1:80 (g/mL). In this study, the second-order kinetic model successfully predicted the change of chlorophyll and antioxidant activity during MAE. The increase of microwave power or/and the solvent amount increased saturated extraction efficiency and the extraction rate constant. However, the saturated concentration of chlorophyll and antioxidant activity increased with the increment of microwave power and the decrease in solvent amount.

Keywords

• chlorophyll
• DPPH
• microwave-assisted extraction
• <i>Polyscias fruticosa</i> (L.) leaves
• second-order kinetic model