Figure 8.

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).