tailieunhanh - New Tribological Ways Part 8

Tham khảo tài liệu 'new tribological ways part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 229 A Comparison of the Direct Compression Characteristics of Andrographis paniculata Eurycoma longifolia Jack and Orthosiphon stamineus Extracts for Tablet Development Fig. 5. b Walker plots of tablets prepared from Eurycoma longifolia Jack Andrographis paniculata and Orthosiphon stamineus for g of feed powders. lastly the Andrographis paniculata extract powder. The high density gave the high value of the tensile strength which was related to the reduction in the void space between particles in the powders during tablet formation with respect to the values of the slopes which decreased as the tensile strength increased. Material Feed powder g Constants R2 value w B Andrographis paniculata Eurycoma longifolia Jack Orthosiphon stamineus Andrographis paniculata Eurycoma longifolia Jack Orthosiphon stamineus Table 4. The Walker model 4. Conclusion This study on direct compression characteristics of selected Malaysian herb extract powders helped to deduce and understand some of the important principles of tablet development. The Eurycoma longifolia Jack extract powder was the easiest of the three herb powders to compress and it underwent significant particle rearrangement at low compression pressures resulting in low values of yield pressure. The compression characteristics of the Eurycoma longifolia Jack powder were consistent when validated with all of the models used. Another significant finding showed that the characteristics of g of feed powder are better than for g of feed powder as proven from the tensile strength test hence a more coherent tablet can be obtained. Thus herbal parameters are superior when screening extract powders with the desired properties such as plastic deformation. This study also validated the use of Heckel Kawakita and Ludde and Walker model .