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Resolution Factor, Tailing Factor, Theoretical Plates and Capacity Factor in HPLC


Learn about Resolution factor, Tailing factor, Theoretical Plates and Capacity factor of HPLC.

Resolution factor:

Resolution factor shows the accuracy of the quantitative analysis and resolution factor should be grater then 1.5 or specified in the individual monograph. Resolution factor can be calculated by following formula

R =               2(t2-t1)               
          2.70 (W1h/2+W2h/2)
W = Peak width
h = Hight
t1 = Retention time of first peak
t2 = Retention time of second peak

Tailing factor:

It should meet the requirements of the individual monograph and can be calculated by following formula.
T = W 0.05
          2F
W0.05 = Peak width at 5% high
F = Leading edge of peak

Theoretical Plates:

Theoretical Plate represents the column efficiency. It should meet the value given in the monograph. It can be calculated by the following formula.

n = 16(t)2   or  5.54x (t)2
      (W)2           (W1/2)2

Capacity factor:

K= t – 1
      tα
t = Retention time of second peak (active)
tα = Retention time of first peak (impurity)



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