Effect of acid pretreatment on different parts of corn stalk for second generation ethanol production

Glucose recovery from different corn stover fractions using dilute acid and alkaline pretreatment techniques

“…The study by Pointner et al (2014) observed similar trend in corn cob where the cellulose content (38.8%) was significantly lower than the hemicellulose content (44.4%). Other researchers also identified a higher content of hemicellulose in untreated corn cob as compared to the cellulose which was similar to the trend found in this study but with some slight changes in quantity (Garlock et al 2009;Li et al 2016). Contrary to this, the cellulose content of corn cob was reported to be higher than the hemicellulose content in similar studies (Bandikari et al 2014;Dominguez et al 1997;Liu et al 2010).…”

“…Then, 200 mL of 2% (w/v) H 2 SO 4 was prepared and poured into the flasks containing the samples as performed by Chen and Xia (2009) with some modifications made on the acid concentration to ensure uniform conditions with AL pretreatment. The 2% (w/v) of H 2 SO 4 used in this study was also used by other researchers in similar studies (Behera et al 2014;Idrees et al 2014;Li et al 2016). The DA pretreatment temperatures studied were 100, 120, 140, and 160°C over pretreatment retention times of 5, 10, 30, and 60 min (Amenaghawon et al 2013;Idrees et al 2014;Jin et al 2013).…”

“…3a), indicating that the leaf recorded the least weight loss after pretreatment. The weight loss observed in DA pretreated samples could have resulted from hydrolysis of hemicellulose into monomeric sugars such as xylose (Li et al 2016;Singh et al 2015). Furthermore, the compositional analysis performed on the raw and pretreated samples indicated that the cellulose content increased from 32.56 to 64.60% in the DA pretreated cob, from 40.45 to 57.00% in the DA pretreated stalk and, finally, in the leaf the content increased from 33.20 to 50.00%.…”

“…The recovered pretreated solids were washed thoroughly in deionized water (6-10 volumes) to a neutral pH and then dried in an oven at 50°C for 48 h. The dried samples were placed into Ziploc freezer bags and stored at a temperature of 4°C until enzymatic hydrolysis. DA pretreatment experiments were conducted in duplicate for each stover fraction as performed in other studies (Li et al 2016).…”

“…Modenbach (2013) also observed an increase in lignin content of about 9% in pretreated corn stover fractions. Furthermore, (Li et al 2016) explained that the increase in lignin content in the recovered pretreated samples could mainly be due to the removal of contents other than lignin in the DA pretreated samples.…”