期刊
CHEMICAL ENGINEERING JOURNAL
卷 276, 期 -, 页码 283-288出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2015.04.039
关键词
Glycerol dehydrogenase; Glycerol; Dihydroxyacetone; Nanoscale enzyme reactors; Enzyme immobilization and stabilization; Magnetic separation
资金
- International Collaborative RD Program [20118510020020]
- Energy Efficiency & Resources Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Korea government Ministry of Trade, Industry Energy [20142020200980]
- Global Research Laboratory Program [2014K1A1A2043032]
- Nano Material Technology Development Program [2014M3A7B4052193]
- University-Institute Cooperation Program - Korea government Ministry of Science, ICT & Future Planning
- Korea University Grant
The biodiesel industry generates glycerol as a main by-product, and the conversion of glycerol to value-added products is an important issue. Glycerol dehydrogenase (GDH) can catalyze the conversion of glycerol to dihydroxyacetone (DHA), which is used as a tanning agent in cosmetics and is much more expensive than glycerol. In this study, GDH was adsorbed into magnetically-separable mesoporous silica with 38 nm mesocellular pores connected via 18 nm window rhesopores (adsorbed GDH, called ADS), and further crosslinked via a simple glutaraldehyde treatment to prepare nanoscale enzyme reactors of GDH (NERs of GDH, called NER). When the stabilities of free and immobilized GDH were monitored in an aqueous buffer under shaking (200 rpm), the residual activities of the free GDH and ADS could no longer be detected after 8 days and 22 days, respectively, while the NER maintained 64% of its initial activity even after 24-day incubation. The time-dependent conversion of glycerol to DHA was measured for both ADS and NER not only by analyzing the generation of NADH spectrophotometrically (340 nm) but also via the HPLC analysis measuring the increase of the DHA peak. Magnetically-separable NER maintained 39% of its initial activity after seven cycles of repeated use, while the residual activity of ADS dropped to 13% of its initial activity after only two recycled uses. (C) 2015 Elsevier B.V. All rights reserved.
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