The researchers studied bamboo hemicellulose fractions isolated using alkaline hydrogen peroxide. They found that the second and third fractions had high purity, while the first fraction contained a small amount of lignin. These fractions are mainly xylan-hemicellulose with a high xylose content. The hemicelluloses are non-crystalline and become more uniform in structure with increasing grade. Multi-stage separation improves purity and structural homogeneity of hemicellulose.