method for increasing the molecular weight of wood manamas and xylans comprising aromatic portions

摘要

A method for increasing the molecular weight of wood manamas and xylans comprising aromatic portions. The present invention is correlated with a method for increasing the molecular weight of wood mananas and xylans comprising aromatic portions, which method comprises the steps of: (a) obtaining wood mannan and / or xylan; (b) subjecting mannan / xylan to oxidizing conditions to convert at least a fraction of the aromatic groups to radicals, and reacting said radicals together to obtain manna / xylan complexes of increased molecular weight. The method is easy and cost effective, and it allows for an increase in the structure of mananas and xylans, which are important in the pulp and paper industry, for a larger and more defined structural size, which makes their isolation easier and also applications in larger areas. Another advantage of the invention is that separation of mananas and xylans from mananas and xylans with attached aromatic groups is provided. Exylan wood manganese with increased molecular weight can be used in the manufacture of barrier films in packaging, for example for oxygen, liquid and gas barriers.