Effect of magnesium stearate or calcium stearate as additives on dissolution profiles of diltiazem hydrochloride from press-coated tablets with hydroxypropylmethylcellulose acetate succinate in the outer shell

The results suggested that some physicochemical interaction occur between magnesium stearate and hydroxypropylmethylcellulose acetate succinate in tablets with HPMCAS and MgSt and the uptake increased markedly in each dissolution medium

Eiji Fukui

2002

Scholarcy highlights

  • Effect of magnesium stearate or calcium stearate on the dissolution profiles of diltiazem hydrochloride in the core of press-coated tablets with an outer shell composed of hydroxypropylmethylcellulose acetate succinate was evaluated by porosity and changes in IR spectra of tablets
  • In JP first fluid, the lag time increased with decreasing porosity and was greatest by the addition of MgSt to HPMCAS
  • Using tablets prepared with the same composition as the outer shell, the changes in IR spectra and uptake amount of the dissolution media after immersion in first fluid and second fluid were determined
  • The results suggested that some physicochemical interaction occur between MgSt and HPMCAS in tablets with HPMCAS and MgSt and the uptake increased markedly in each dissolution medium
  • These phenomena seem to cause a prolongation of lag time in first fluid but a shortening of it in second fluid in PC tablets with HPMCAS and MgSt
  • The lag time was only slightly prolonged in first fluid, markedly prolonged in second fluid due to suppression of second fluid penetration into micro pores in the outer shell and HPMCAS gel formation on the surface in PC tablets with HPMCAS and CaSt
  • The lag time was only slightly prolonged in first fluid, markedly prolonged in second fluid due to suppression of second fluid penetration into micro pores in the outer shell and hydroxypropylmethylcellulose acetate succinate gel formation on the surface in PC tablets with HPMCAS and calcium stearate

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