Mobile phase— Prepare a filtered and degassed mixture of 0.04Maqueous monobasic potassium phosphate and methanol (55:45).Make adjustments if necessary (see System Suitabilityunder Chromatography á621ñ).
Internal standard solution— Prepare a solution of methylparaben in Mobile phasehaving a concentration of about 100µg per mL.
Standard preparation— Prepare a solution of USP Thiamine Hydrochloride RSin Mobile phasehaving an accurately known concentration of about 500µg per mL.Pipet 10mLof this solution and 10mLof Internal standard solutioninto a 100-mLvolumetric flask,dilute with Mobile phaseto volume,and mix to obtain a Standard preparationhaving a known concentration of about 50µg per mL.
Assay preparation— Quantitatively dilute an accurately measured volume of Oral Solution with Mobile phaseto obtain a solution containing about 500µg of thiamine hydrochloride per mL.Pipet 10mLof the resulting solution and 10mLof Internal standard solutioninto a 100-mLvolumetric flask,dilute with Mobile phaseto volume,and mix.
Mobile phase— Prepare a filtered and degassed mixture of 0.04Maqueous monobasic potassium phosphate and methanol (55:45).Make adjustments if necessary (see System Suitabilityunder Chromatography á621ñ).
Internal standard solution— Prepare a solution of methylparaben in Mobile phasehaving a concentration of about 100µg per mL.
Standard preparation— Prepare a solution of USP Thiamine Hydrochloride RSin Mobile phasehaving an accurately known concentration of about 500µg per mL.Pipet 10mLof this solution and 10mLof Internal standard solutioninto a 100-mLvolumetric flask,dilute with Mobile phaseto volume,and mix to obtain a Standard preparationhaving a known concentration of about 50µg per mL.
Assay preparation— Quantitatively dilute an accurately measured volume of Oral Solution with Mobile phaseto obtain a solution containing about 500µg of thiamine hydrochloride per mL.Pipet 10mLof the resulting solution and 10mLof Internal standard solutioninto a 100-mLvolumetric flask,dilute with Mobile phaseto volume,and mix.
hyheying 回复于：2010/3/5 15:30:01
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