Lignin material definition

Historically, dietary fiber referred to iasoluble plant cell wall material, primarily polysaccharides, not digested by the endogenous enzymes of the human digestive tract. This definition has been extended to iaclude other nondigestible polysaccharides, from plants and other sources, that are iacorporated iato processed foods. Cellulose [9004-34-6] (qv) is fibrous however, lignin [9005-53-2] (qv) and many other polysaccharides ia food do not have fiberlike stmctures (see also Carbohydrates). 

In considering the various methods proposed for the determination of lignin, it is important to bear in mind that none can be regarded as totally satisfactory. This situation arises from the fact that lignin has yet to be isolated in a pure or unmodified condition. As a result there is no definitive structural formula of lignin currently available upon which to base the development of a rational and quantitative measurement or to assess accurately the validity of the methods currently available. In addition, many of the methods which are commonly applied to the determination of lignin have fundamental defects which seriously undermine their accuracy. For these reasons, values reported in the literature may not always provide a reliable indication of the true lignin content of a material. 

A big step in the direction of biobased polymer synthesis - moving away from petroleum and toward sugar, cellulose, starch, oils and fats, or lignin for raw materials - will definitely change the face of polymer chemistry. 

Polignate sodium Sodium iigninsuifonate Sodium polignate Definition Sodium sail of poiysuifonated lignin, a dark brown polymeric material from wood... 

It is not possible to designate a definitive structure for this amorphous polymeric material. Lignin is difficult to isolate in its natural state and is difficult to degrade chemically. Nonetheless, there is general agreement concerning die prin-... 

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