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Xylans are also ranked as extensively found polysaccharide. It is abundantly found in the cereals, straw, sorghum, hardwood and grasses. Xylans are thought to be linked to the microfibrils of cellulose to contribute in their tensile strength properties, especially in second cell wall. Structurally, xylans have same structure like, (1–4) β connected xylose subunits with branching of (1–2) α bonded 4-O-methyl glucuronic acid and glucuronic acid subunits, respectively. The configuration and distribution of the attached substituents vary among different species. In some molecules, arabinose sugar residues have attached to the backbone of the xylans known as arabinoxylan which have been abundantly found in the endosperm of cereals. Similarly, secondary cell wall of the dicots have acetylated-xylans in which acetyl group attached to O-3 of xylose residues and very less common to O-2 [13, 18].