期刊
BIOCHEMICAL ENGINEERING JOURNAL
卷 151, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.bej.2019.107318
关键词
Gallnut water extract; Electron shuttles; Microbial fuel cells; Batch processing; Bioreactors; Bioconversion
资金
- Taiwan's Ministry of Science and Technology [MOST 106-2221-E-197-020-MY3, 106-2923-E-197-002-MY3, 106-2621-M-197001, 105-2622-E-197-012-CC3]
This first-attempt study revealed the feasibility assessment that medicinal herbs with abundant hydrolysable tannin (i.e., Galla chinensis (gallnut)) were highly promising to maximize bioenergy extraction. The cyclic voltammetric profiles of both gallnut and tannic acid (TA) showed significant redox potential peaks for comparison. Moreover, higher extraction temperature at 85 degrees C could enhance the hydrolysis efficiency of tannin contents and possibly further resulting in higher yields of gallic acid (GA). The power density analysis of microbial fuel cells (MFCs) indicated that the supplementation of gallnut water extract (GWE) could significantly stimulate the power generation of MFCs. This might be resulted from the sufficient hydrolysis of GWE into GA as electron shuttles (ESs) for power stimulation. Compared with other herbal extract, GWE owned not only the most abundant content of antioxidants, but also the best stimulation capability on power generation (e.g., 67.77 mW m(-2) at 1000 mg L-1 GWE) for bioenergy/biorefinery applications.
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