Compound

Intra-day R.S.D. for retention time (%)

Intra-day R.S.D. for
peak area (%)

Inter-day R.S.D. for
retention time (%)

Inter-day R.S.D. for
peak area (%)

Ascorbic acid

1.14

1.04

1.27

1.48

Gallic acid

1.62

1.34

1.68

1.15