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Compression Profiles Of Different Molecular Weight Chitosans
Faisal Al-Akayleh, I. Rashid, Mahmoud Al-omari, K. Al-Sou’od, B. Chowdhry, A. Badwan
Published 2016 · Materials Science
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Abstract The compression behavior of hydrophilic chitosan has been investigated as a function of molecular weight (MW), ranging from 8 to 100 kDa. Powder packing, plasticity, elasticity, brittle-fracture nature were evaluated using force displacement curves and Heckel/Kawakita analysis upon compression of different MW chitosan powders. The compacts produced were subjected to ejection work determination and tensile strengths analysis, the later using Leuenberger equation. Molecular modeling was used to correlate the MW-binding energy dependence on the physical strength of the chitosan compacts. The high work of compression of the low MW (≤ 30 kDa) chitosans is accounted for their brittle nature upon compression. At high compression forces (> 3 kN), the low MW chitosan compacts exhibited slightly lower tensile strength due to their increasing extents of elastic recovery and ejection work. Lower particle size of chitosan enhances lower fragmentation, packing, and frictional tendency that can be related to an increase in plastic deformation and compacts tensile strength. In molecular modeling, the calculated higher binding energies of the high MW chitosan (88 kDa) than that of the low MW chitosan (8 kDa) may further explain its rigid, complex nature when compared to low MW chitosan. Upon compression, increasing MW of chitosan is manifested as higher energies for densification which in turn determines the extent of helical packing from intermingled molecular to open structure as the MW is decreased. Such changes in structural configuration are suggested to contribute to the transfer from plastic to brittle-fracture nature with high packing extent of chitosan upon compression when the MW is reduced. The foregoing may justify the slow diclofenac Na drug release upon dissolution testing when low MW chitosan is used in tablet preparation.
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