**5. Summary**

Lignin fractionation has the potential of transforming low quality, heterogenous lignins to streams of lignin fractions with less impurities and narrower internal variation in chemical and structural properties, thus may enable the development of novel value-added products from lignin. To achieve this goal, cost-effective technologies that deliver lignin fractions with specific properties (e.g., low polydispersity, low ash, high/low phenolics content) are required. Methods for characterization of lignin fractions, as well as technologies for controlling lignin fraction characteristics, are instrumental in lignin fractionation for valorization. Therefore, new delignification, fractionation, characterization, and upgrading methods should be developed in tandem so that a complete pipeline of lignin valorization can be accomplished.

*Fractionation of Lignin for Valorization DOI: http://dx.doi.org/10.5772/intechopen.107338*
