Investigation of Thermodynamic Mechanism for Extraction of Active Constituents in Lycoris radiata and Rhizma Polygoni Cuspidati Using Microwave-assisted Extraction

Chem. J. Chinese Universities

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Investigation of Thermodynamic Mechanism for Extraction of Active Constituents in Lycoris radiata and Rhizma Polygoni Cuspidati Using Microwave-assisted Extraction

FAN Hua-Jun^1,2, LIN Guang-Xin¹, XIAO Xiao-Hua¹, LI Gong-Ke¹

1. School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, China;
2. College of Pharmacy, Guangdong Pharmaceutical University, Guangzhou 510224, China

Received:2006-01-18 Revised:1900-01-01 Online:2006-12-10 Published:2006-12-10
Contact: LI Gong-Ke

Abstract

Abstract: The extraction mechanism of lycorine, lycoramine, galanthamine and resveratrol, emodin in two dissimilar plants namely Lycoris radiata and Rhizma Polygoni Cuspidati was investigated by using the closed microwave-assisted extraction(MAE), respectively. Solvent reflux extraction(SRE) was also performed for comparison study. A simple model was applied to calculate partition coefficients K, ΔH⁰, ΔS⁰ and ΔG⁰ of the constituents determined for MAE and SRE, and their thermodynamic behavior, chemical structures and polarities were further discussed. With the observation of scan electron microscopy, the cell microstructures of Lycoris radiata Herbert and Rhizma Polygoni Cuspidati were changed in MAE process. The results show that MAE and SRE were endothermic and entropy increase processes, the effects of microwave on cell led thermodynamic functions to greater change, MAE with the higher yields was more spontaneous than SRE.

Key words: Microwave-assisted extraction, Thermodynamics, Mechanism, Lycoris radiata, Rhizma Polygoni Cuspidati

CLC Number:

O657

TrendMD:

FAN Hua-Jun^1,2, LIN Guang-Xin¹, XIAO Xiao-Hua¹, LI Gong-Ke¹. Investigation of Thermodynamic Mechanism for Extraction of Active Constituents in Lycoris radiata and Rhizma Polygoni Cuspidati Using Microwave-assisted Extraction[J]. Chem. J. Chinese Universities, doi: .

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Investigation of Thermodynamic Mechanism for Extraction of Active Constituents in Lycoris radiata and Rhizma Polygoni Cuspidati Using Microwave-assisted Extraction

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