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Table 4 Filter paper compatibility results

From: A novel stability-indicating method for known and unknown impurities profiling for diltiazem hydrochloride pharmaceutical dosage form (tablets)

Filter paper

Prep

No.

Imp-F

(%w/w)

SMU Imp

(%w/w)

Total Imp

(%w/w)

Centrifuge

1

0.35

0.02

0.41

Centrifuge

2

0.35

0.02

0.41

0.45-µm PVDF

1

0.35

0.02

0.41

0.45-µm PVDF

2

0.35

0.02

0.41

0.45-µm Nylon

1

0.35

0.02

0.41

0.45-µm Nylon

2

0.35

0.02

0.41

% Absolute difference (%w/w)

Centrifuge

1

0.00

0.00

0.00

Centrifuge

2

0.00

0.00

0.00

0.45-µm PVDF

1

0.00

0.00

0.00

0.45-µm PVDF

2

0.00

0.00

0.00

0.45-µm Nylon

1

0.00

0.00

0.00

0.45-µm Nylon

2

0.00

0.00

0.00

  1. Pre., preparation; SMU, single max unknown; Imp., impurity