Use of Gelidium amansii as a promising resource for bioethanol: A practical approach for continuous dilute-acid hydrolysis and fermentation

• Published in: Bioresource technology Vol. 108; pp. 83 - 88
• Main Authors: Park, Jeong-Hoon, Hong, Ji-Yeon, Jang, Hyun Chul, Oh, Seung Geun, Kim, Sang-Hyoun, Yoon, Jeong-Jun, Kim, Yong Jin
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01-03-2012
• Subjects: Agar - chemistry; Bioreactors; Continuous process; Dilute-acid hydrolysis; Ethanol - metabolism; Fermentation; Gelidium amansii; Hydrolysis; Inhibitor; Models, Biological; Red seaweed; Rhodophyta - chemistry; Continuous process; Inhibitor; Gelidium amansii; Red seaweed; Dilute-acid hydrolysis
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2011.12.065

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► Continuous dilute-acid hydrolysis and fermentation using Gelidium amansii as substrate. ► High yield of fermentable sugars and inhibitors were significantly reduced. ► Sugar yield, inhibitor formation, and fermentation was systematically compared.
A facile continuous method for dilute-acid hydrolysis of the representative red seaweed species, Gelidium amansii was developed and its hydrolysate was subsequently evaluated for fermentability. In the hydrolysis step, the hydrolysates obtained from a batch reactor and a continuous reactor were systematically compared based on fermentable sugar yield and inhibitor formation. There are many advantages to the continuous hydrolysis process. For example, the low melting point of the agar component in G. amansii facilitates improved raw material fluidity in the continuous reactor. In addition, the hydrolysate obtained from the continuous process delivered a high sugar and low inhibitor concentration, thereby leading to both high yield and high final ethanol titer in the fermentation process.