Journal
MOLECULES
Volume 14, Issue 12, Pages 5027-5041Publisher
MDPI
DOI: 10.3390/molecules14125027
Keywords
kinetic; MCC; phosphoric acid; decrystallization; structural change
Funding
- Natural Science Foundation of China [50776035, U0733001]
- Foundation of Scientific Research for Universities [20070561038]
- Ministry of Education of China [IRT0552]
- National High Technology Project [2007AA05Z408]
- National Key RD Program [2007BAD34B01]
- Ministry of Science and Technology of China [2010CB732201]
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In this study, we aimed to dissolve microcrystalline cellulose (MCC) with phosphoric acid to obtain high-quality fermentable saccharides. MCC was directly dissolved in phosphoric acid (the concentration was 83%) for 10 hours at temperatures of 30, 50, and 70 degrees C. The structural changes of MCC were determined in detail with X-ray powder diffraction, solid-state cross-polarization magic angle spinning C-13-NMR, and Xray photoelectron spectroscopy. The kinetics of MCC decrystallization during treatment with phosphoric acid was also compared at 30, 50, and 70 degrees C. With the assumption of first order kinetics, the Arrhenius parameters of K, A(0) and E-a were calculated. The rate constants of decrystallization reaction (K) were 0.06, 0.17, and 0.12 h(-1) respectively. The pre-exponential factor (A(0)) was 1.2 x 10(6) h(-1), and the activation energy (E-a) was 42.4 k J/mol.
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