Figure 8
![Figure 8](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2F1472-6750-14-18/MediaObjects/12896_2014_Article_980_Fig8_HTML.jpg)
Unsaturated oligogalacturonic acid released from ramie bast fibers with different treatments. Ramie bast fibers were treated with 100 U ml−1 (■),300 U ml−1 (●),500 U ml−1 (▲) and 700 U ml−1 (△) of PelN, and 500 U ml−1 of PelN after pre-treatment of 2% NaOH for 0.5 h(♦), respectively. Error bars represent ± SD (n = 3).