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      저자 : O. A. Itiola (검색결과 2 건)
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      • KCI등재

        Effects of material properties and speed of compression on microbial survival and tensile strength in diclofenac tablet formulations

        J. O. Ayorinde,O. A. Itiola,M. A. Odeniyi 대한약학회 2013 Archives of Pharmacal Research Vol.36 No.3

        A work has been done to study the effects ofmaterial properties and compression speed on microbialsurvival and tensile strength in diclofenac tablet formulations. Tablets were produced from three formulationscontaining diclofenac and different excipients (DC, DL andDDCP). Two types of machines (Hydraulic hand press andsingle punch press), which compress the tablets at differentspeeds, were used. The compression properties of thetablets were analyzed using Heckel and Kawakita equations. A 3-dimensional plot was produced to determine therelationship between the tensile strength, compressionspeed and percentage survival of Bacillus subtilis in thediclofenac tablets. The mode of consolidation of diclofenacwas found to depends on the excipient used in the formulation. DC deformed mainly by plastic flow with the lowestPy and Pk values. DL deformed plastically at the initialstage, followed by fragmentation at the later stage ofcompression, whereas DDCP deformed mainly by fragmentationwith the highest Py and Pk values. The ranking ofthe percentage survival of B. subtilis in the formulationswas DDCP[DL[DC, whereas the ranking of the tensilestrength of the tablets was DDCP[DL[DC. Tabletsproduced on a hydraulic hand press with a lower compressionspeed had a lower percentage survival of microbialcontaminants than those produced on a single punchpress, which compressed the tablets at a much higherspeed. The mode of consolidation of the materials and thespeed at which tablet compression is carried out haveeffects on both the tensile strength of the tablets and theextent of destruction of microbial contaminants in diclofenactablet formulations.

      • KCI등재

        Individual and Interacting Effects of Formulation Variables on the Tensile Strength and Microbial Survival in Diclofenac Tablets

        John O. Ayorinde,Oludele A. Itiola 대한약학회 2010 Archives of Pharmacal Research Vol.33 No.3

        A work has been done to study the individual and interacting effects of formulation variables, using a 23 fractional factorial design. The effects of five variables, namely, relative density of tablets, nature and concentration of binder, compression process, and compression speed on the tensile strength and percent survival of Bacillus subtilis spores in Diclofenac tablet formulations were determined. The effects of these variables were studied both singly and when they interact with each other in two fractional designs (Woolfall, 1964). The first fraction comprised of Nature (N) and Concentration (C) of binder, and Relative density of tablets (D) while in the second fraction, Compression speed (S), Compression process (P) and Relative density of tablets (D) were studied. In the first fraction, concentration of binder had the highest effect on tensile strength with the ranking C > D > N for both DCS (formulation containing Corn starch) and DDCP (formulation containing DCP), and C > N > D for DL (formulation containing Lactose). On the percent survival of Bacillus subtilis, relative density of tablets showed the highest effect with the ranking D > C > N for both DCS and DL, and D > N > C for DDCP. In the second fraction, compression speed generally had a great effect on both tensile strength and percent survival in all the formulations. The results of interactions among the variables showed the highest effect on tensile strength from interaction between concentration of binder and relative density of tablets (C-D) while interaction between compression speed and relative density of tablets (S-D) had the highest effect on percent survival in all the formulations. A fractional factorial design proved suitable in determining the magnitude of both the individual and interacting effects of the variables. The study showed that each of these variables has to be properly considered in producing tablets of satisfactory strength and reduced microbial survival.

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