Corn stover pretreatment by inorganic salts and its effects on hemicellulose and cellulose degradation.
Inorganic salts, NaCl, KCl, CaCl(2), MgCl(2), FeCl(2), FeSO(4), FeCl(3), and Fe(2)(SO(4))(3), were studied as catalysts for the degradation of hemicellulose in corn stover. FeCl(3) significantly increased the hemicellulose degradation in aqueous solutions heated between 140 and 200 degrees C with high xylose recovery and low cellulose removal, amounting to approximately 90% and <10%, respectively. Hemicellulose removal increased 11-fold when the corn stover was pretreated with 0.1 M FeCl(3) compared to pretreatment with hot water under otherwise the same conditions, which was also 6-fold greater than pretreatment with dilute sulfuric acid at the same pH. Optimum pretreatment conditions were found where the corn stover was pretreated with 0.1 M FeCl(3) at 140 degrees C for 20 min. Under such conditions, 91% of hemicellulose was removed, and the recovery of monomeric and oligomeric xylose in liquid fraction achieved 89%, meanwhile, only 9% of cellulose was removed.
Liu
Li
L
College of Food Science and Nutritional Engineering, China Agricultural University, P.O. Box 398, 17 Qinghua Donglu, Haidian District, Beijing 100083, China.
Sun
Junshe
J
Cai
Chengye
C
Wang
Shuhao
S
Pei
Haisheng
H
Zhang
Jingsheng
J
D001673:Biodegradation, Environmental; D001709:Biotechnology / Q000379:methods; D002384:Catalysis; D002482:Cellulose / Q000737:chemistry; D002712:Chlorides; D005290:Ferric Compounds / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry; D007700:Kinetics; D008855:Microscopy, Electron, Scanning / Q000379:methods; D011134:Polysaccharides / Q000737:chemistry*; D012492:Salts / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature; D014994:Xylose / Q000737:chemistry; D003313:Zea mays / Q000378:metabolism*
D002712:Chlorides; D005290:Ferric Compounds; D011134:Polysaccharides; D012492:Salts; C007916:hemicellulose; D002482:Cellulose; D014994:Xylose; D007501:Iron; C024555:ferric chloride