Skip to main content
. 2009 Jan-Feb;71(1):30–34. doi: 10.4103/0250-474X.51949

TABLE 4.

F2 VALUE CALCULATION AT PH 6.8 PHOSPHATE BUFFER (MEAN CPR)*

Time(t) f2 value of optimized formulation (F4)

n 1 n 2 n 3 n 4 n 5 n 6 n 7 n 8 Sum
Reference 26.9 28.8 29.2 32.1 34.5 42.7 66.5 88.4 -
Test 31.9 34.6 34.9 36.1 40.1 46.8 46.8 73.9 -
Rt-Tt −5.0 −5.7 −5.7 −4.0 −5.6 −4.1 −7.4 −5.1 -
(Rt-Tt)2 25.0 32.49 32.49 16.0 31.36 16.81 54.76 26.01 234.92

f2=50*log{[1+(1/nsum(Rt-Tt)^2]−0.5}*100=62.94066786

*

CPR= Cumulative percent release, n1-n8= Time points, n= Mean time points