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Comparison of Enzymic Saccharification of Starch and Cellulose from Technological and Economic Aspects
Author(s) -
Réczey K.,
László E.,
Holló J.
Publication year - 1986
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/star.19860380906
Subject(s) - hydrolysis , liquefaction , starch , cellulose , raw material , cellulosic ethanol , chemistry , pulp and paper industry , enzymatic hydrolysis , cellulase , lignin , waste management , food science , organic chemistry , engineering
Enzymatic saccharification of starch in the case of both pure starch and starchy raw materials is a long adopted technology successfully applied on industrial scale for many years. On the other hand, a feasible procedure for enzymatic saccharification of the other glucose polymer, cellulose, has been realized so far only on pilot‐plant scale. A particularly difficult problem is the enzymatic saccharification of cellulosic substances encrusted with lignin. The first step in starch and cellulose saccharification is pretreatment and digestion of the raw material. In the case of starch, this is solved by liquefaction in the presence of thermostable alpha‐amylase in a jet cooker. As a result, starch undergoes partial degradation and liquefaction. In the case of cellulose, the most economical method of pretreatment seems to be “steam‐explosion”, although this does not involve liquefaction either, i. e., saccharification proceeds still in heterogeneous phase. Comparison is made of the energy requirements of digestion of the raw materials and costs of enzymatic saccharification for both substrates.