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Title: Importance of small pores in microcrystalline cellulose for controlling water distribution during extrusion - Spheronization
Authors: Soh, J.L.P.
Yang, L.
Liew, C.V. 
Cui, F.D.
Heng, P.W.S. 
Keywords: Extrusion - spheronization
Microcrystalline cellulose
Spheronization aid
Torque rheometry
Issue Date: 2008
Citation: Soh, J.L.P., Yang, L., Liew, C.V., Cui, F.D., Heng, P.W.S. (2008). Importance of small pores in microcrystalline cellulose for controlling water distribution during extrusion - Spheronization. AAPS PharmSciTech 9 (3) : 972-981. ScholarBank@NUS Repository.
Abstract: The purpose of this research was to investigate the effects of particle size on the wet massing behavior of microcrystalline cellulose (MCC). In this study, a series of six fractionated MCC grades were customized and specially classified to yield different particle size varieties of the standard grade, Comprecel M101. All seven MCC grades were extensively characterized for the physical properties and wet massing behavior using mixer torque rheometry. Effects of MCC physical properties on the maximum torque (Torquemax) were determined using partial least squares (PLS) analysis. Most physical properties varied systematically with particle size and morphological changes. Marked differences were observed in the small pore volumes (VhighP) and BET surface areas of the MCC grades. Variables that exerted dominant influences on Torquemax were identified. In particular, the significance of VhighP in governing wet mass consistency was established. The role of VhighP has not been reported in any study because this small but significant variation is likely to be obliterated or compensated by variation in other physical properties from MCC grades from different suppliers. The findings demonstrated the role of small pores in governing the wet mass consistency of MCC and provide a better understanding of MCC's superior performance as a spheronization aid by the ability to fulfill the function as a molecular sponge to facilitate pellet formation during wet granulation processes. © American Association of Pharmaceutical Scientists 2008.
Source Title: AAPS PharmSciTech
ISSN: 15309932
DOI: 10.1208/s12249-008-9134-9
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