[The relationship between dividing properties of scored tablets and dynamic characteristics of powder]

The relationship between dividing properties of the scored tablet and dynamic characteristics of the powder was investigated for proving the effects of physical characteristics of the powder on dividing properties of the scored tablet. Lactose, microcrystalline cellulose, corn starch, synthetic aluminum silicate and Perfiller were used as excipients. The dynamic characteristics of the powder, such as tensile strength (T), cohesive force (C), angle of friction (delta), flow factor (FF), shear index (n), C/T(K) and constants of Kawakita's equation of tapping compaction (a, 1/b) were measured. No correlations between coefficient of variation of divided tablet weight and each dynamic characteristics of the powder were found. However, from the result of the multiple regression analysis, multiple regression equation containing C and a as variables was obtained. Then a significant correlation was obtained between coefficient of variation of divided tablet weight and C/a, and also between logarithms of dividing strength of scored tablets and C/a. As a result, coefficient of variation of divided tablet weight decreased and dividing strength of scored tablets increased with decreasing C/a value.