Surface energy of microcrystalline cellulose determined by capillary intrusion and inverse gas chromatography.
Surface energy data for samples of microcrystalline cellulose have been obtained using two techniques: capillary intrusion and inverse gas chromatography. Ten microcrystalline cellulose materials, studied using capillary intrusion, showed significant differences in the measured surface energetics (in terms of total surface energy and the acid-base characteristics of the cellulose surface), with variations noted between the seven different manufacturers who produced the microcrystalline cellulose samples. The surface energy data from capillary intrusion was similar to data obtained using inverse gas chromatography with the column maintained at 44% relative humidity for the three samples of microcrystalline cellulose studied. This suggests that capillary intrusion may be a suitable method to study the surface energy of pharmaceutical samples.
Pharmaceutical Technology Research Group, Department of Pharmacy & Pharmacology, University of Bath, Bath BA2 7AY, UK.
D Fraser
DF
Steele
R Christian
RC
Moreton
John N
JN
Staniforth
Paul M
PM
Young
Michael J
MJ
Tobyn
Stephen
S
Edge
D002482:Cellulose / Q000737:chemistry*; D055598:Chemical Phenomena; D002849:Chromatography, Gas; D005079:Excipients / Q000737:chemistry*; D008962:Models, Theoretical; D011208:Powders; D012997:Solvents / Q000737:chemistry; D013499:Surface Properties; D013816:Thermodynamics; D014783:Viscosity
D005079:Excipients; D011208:Powders; D012997:Solvents; D002482:Cellulose; C109691:microcrystalline cellulose