Abstract
Background: Polycarboxylic acids are of interest as simple mimics for cellulase enzyme- catalyzed depolymerization of cellulose. In this study, DFT calculations were used to investigate the effect of structure on dicarboxylic acid organo-catalyzed hydrolysis of cellulose model compound D-cellobiose to D-glucose.
Methods: Binding energy of the complex formed between D-cellobiose and acid (Ebind), as well as glycosidic oxygen to dicarboxylic acid closest acidic H distance, were studied as key parameters affecting the turn over frequency of hydrolysis in water.
Results: α-D-cellobiose - dicarboxylic acid catalyst down face approach showed high Ebind values for five of the six acids studied, indicating the favorability of the down face approach. Maleic, cis-1,2-cyclohexane dicarboxylic, and phthalic acids with the highest catalytic activities showed glycosidic oxygen to dicarboxylic acid acidic H distances 3.5-3.6 Å in the preferred configuration.
Conclusion: The high catalytic activities of these acids may be due to the rigid structure, where acid groups are held in a fixed geometry.
Keywords: Cellobiose, polycarboxylic acids, glucose, hydrolysis, hydrogen-bonding, DFT calculations.
Graphical Abstract
[http://dx.doi.org/10.1016/j.rser.2020.109763]
[http://dx.doi.org/10.1016/j.ijhydene.2019.07.133]
[http://dx.doi.org/10.1016/j.cej.2018.04.057]
[http://dx.doi.org/10.1016/j.renene.2018.12.108]
[http://dx.doi.org/10.1016/j.fuproc.2020.106528]
[http://dx.doi.org/10.1016/j.indcrop.2020.113055]
[http://dx.doi.org/10.1007/s00253-011-3701-9] [PMID: 22113558]
[http://dx.doi.org/10.1016/j.apcatb.2015.03.003]
[http://dx.doi.org/10.1039/c3gc40136g]
[http://dx.doi.org/10.1039/B711512A]
[http://dx.doi.org/10.1021/ie901047u]
[http://dx.doi.org/10.1007/s12155-012-9291-2]
[http://dx.doi.org/10.1016/j.biortech.2015.04.030] [PMID: 25911191]
[http://dx.doi.org/10.1039/C5CY01677K]
[http://dx.doi.org/10.1016/S0960-8524(01)00212-7] [PMID: 12058826]
[http://dx.doi.org/10.1002/bit.10316] [PMID: 12209808]
[http://dx.doi.org/10.1021/bp010028u] [PMID: 11386868]
[http://dx.doi.org/10.1007/s10570-017-1603-4]
[http://dx.doi.org/10.1246/bcsj.20170263]
[http://dx.doi.org/10.1002/anie.201504865] [PMID: 26276901]
[http://dx.doi.org/10.1002/cssc.201300720] [PMID: 24616436]
[http://dx.doi.org/10.1021/acs.accounts.7b00614] [PMID: 29443505]
[http://dx.doi.org/10.1021/acssuschemeng.5b01489]
[http://dx.doi.org/10.1021/acs.jpcc.5b06476]
[http://dx.doi.org/10.1016/j.mcat.2019.110459]
[http://dx.doi.org/10.1016/j.carres.2019.02.002]
[http://dx.doi.org/10.1063/1.464913]
[http://dx.doi.org/10.1016/0009-2614(92)85009-Y]
[http://dx.doi.org/10.1021/j100096a001]
[http://dx.doi.org/10.1063/1.477924]
[http://dx.doi.org/10.1063/1.481224]
[http://dx.doi.org/10.1021/cr9904009] [PMID: 16092826]
[http://dx.doi.org/10.1016/0301-0104(81)85090-2]
[http://dx.doi.org/10.1063/1.473558]