Surfactants used newspaper

Park, J. W.,Takahata, Y., Kajiuchi,T., and Akehata,T. 1992. Effects of Nonionic Surfactant on Enzymatic Hydrolysis of Used Newspaper. Biotech. Bioeng., 39,17-120. 

A mixture of three newspapers issued in Korea was used as substrate. Newspaper was cut into approx 0.5 x 0.5 cm pieces. The moisture of the paper was 6.8 wt% with the following composition 56.2 wt% glucan, 13.9 wt% xylan + mannan + galactan (XMG), 15.0 wt% klason lignin, and 7.4 wt% ash. The nonionic surfactants (TCI Tokyo Kasei Kogyo, Tokyo, Japan) used are listed in Table 1. 

Pretreated samples in our study were washed with water until neutralized to pH 7.0, but this step required a lot of water, about 300 times the weight of substrate used, because the pretreated sample was sticky and swollen. It was theorized that there was still a small amount of surfactant left in the washed fibers, and that residual surfactant may help enzymatic hydrolysis. Figure 4 shows the effect of residual surfactant after pretreatment on digestibility at 72 h. To see this effect, newspaper was pretreated without surfactant, and then a given amount of surfactant was added to... 

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