Comparison of red, brown and green seaweeds on enzymatic saccharification process

Abstract The production of bioethanol from seaweeds using acid hydrolysis and the enzymatic saccharification was studied. Red seaweed (Gelidium amansii), brown seaweed (Laminaria japonica), and green seaweed (Codium fragile) were selected, and the characteristics of their conversion to bioethanol were analyzed. The optimum conditions of the dilute acid hydrolysis preprocessing for bioethanol production from the seaweed were a reaction temperature of 150 °C, sulfuric acid content of 5.0 wt.%, and reaction time of 60 min. The seaweeds listed in order of bioethanol conversion performance are red seaweed > brown seaweed > green seaweed. The optimum dosage of enzyme was 2.0 mL per 10 g of seaweed. The optimal fermentation conditions for bioethanol production using seaweed included a commercial yeast dosage of 30 wt.% and a fermentation time of 3 days.

[1]  H. Atsushi,et al.  CO2 fixation and ethanol production with microalgal photosynthesis and intracellular anaerobic fermentation , 1997 .

[2]  B. Saha,et al.  Enzymatic saccharification and fermentation of alkaline peroxide pretreated rice hulls to ethanol , 2007 .

[3]  R. Elander,et al.  A Comparison of Aqueous and Dilute-Acid Single-Temperature Pretreatment of Yellow Poplar Sawdust , 2001 .

[4]  Enver Doruk Özdemir,et al.  Land substitution effects of biofuel side products and implications on the land area requirement for EU 2020 biofuel targets , 2009 .

[5]  Anoop Singh,et al.  Renewable fuels from algae: an answer to debatable land based fuels. , 2011, Bioresource technology.

[6]  Ayhan Demirbas,et al.  Use of algae as biofuel sources. , 2010 .

[7]  N. Nagasawa,et al.  Growth-promotion of plants with depolymerized alginates by irradiation , 2000 .

[8]  M. Galbe,et al.  Bio-ethanol--the fuel of tomorrow from the residues of today. , 2006, Trends in biotechnology.

[9]  Mats Galbe,et al.  The influence of solid/liquid separation techniques on the sugar yield in two-step dilute acid hydrolysis of softwood followed by enzymatic hydrolysis , 2009, Biotechnology for biofuels.

[10]  Yoon-Yong Lee,et al.  Dilute-Acid Hydrolysis of Lignocellulosic Biomass , 1999 .

[11]  F M Gírio,et al.  Hemicelluloses for fuel ethanol: A review. , 2010, Bioresource technology.

[12]  A. Vergara-Fernández,et al.  Evaluation of marine algae as a source of biogas in a two-stage anaerobic reactor system. , 2008 .

[13]  M. H. Norziah,et al.  Nutritional composition of edible seaweed Gracilaria changgi , 2000 .

[14]  Hyun Kim,et al.  Purification and characterization of the extracellular alginate lyase from Streptomyces sp. MET 0515 , 2007 .