Microwave has been widely used in the extraction of many samples for its unique heating mechanism, short extraction time and high yield of extract. The microstructure characteristics of plant materials are closely related with macro-property and mechanism on mass transfer within matrix. Fractal geometry, with the ability to describe irregular objects provides a new language. Astragalus slice is a special and typical plant porous media. We characterize the microstructure of Astragalus slices irradiated by microwave at 600 and 900 W by using fractal dimension, with the aim to analyze the effect of the microwave power on the extraction yield and discuss further the relationship between the fractal dimensions and microstructure changes of sample during microwave assisted extraction process. It is found that the fractal scaling law of box counting method is not suitable for the apertures on the wall of trachea inside matrix, and Slit Island and mercury injection method may be used. Fractal dimensions of samples at microwave 600 W are smaller than that at 900 W. The smaller fractal dimension is in favor of effective components dissolution inside the slices, which led to extract with the 20 min irradiation of microwave at 600 W is higher than that at 900 W.
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ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer
December 18–21, 2009
Shanghai, China
Conference Sponsors:
- Nanotechnology Institute
ISBN:
978-0-7918-4390-1
PROCEEDINGS PAPER
Fractal Characterization of Astragalus Slices Under Various Microwave Assisted Extraction Conditions
Qianqian Di,
Qianqian Di
Tianjin University, Tianjin, China
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Junhong Yang,
Junhong Yang
Tianjin University, Tianjin, China
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Liqiu Wang
Liqiu Wang
The University of Hong Kong, Hong Kong, China
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Qianqian Di
Tianjin University, Tianjin, China
Junhong Yang
Tianjin University, Tianjin, China
Mingdi Sun
Tianjin University, Tianjin, China
Liqiu Wang
The University of Hong Kong, Hong Kong, China
Paper No:
MNHMT2009-18284, pp. 289-297; 9 pages
Published Online:
October 26, 2010
Citation
Di, Q, Yang, J, Sun, M, & Wang, L. "Fractal Characterization of Astragalus Slices Under Various Microwave Assisted Extraction Conditions." Proceedings of the ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer. ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer, Volume 2. Shanghai, China. December 18–21, 2009. pp. 289-297. ASME. https://doi.org/10.1115/MNHMT2009-18284
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