[Retracted] Ternary Complexation Process for New Spectrophotometric Assay of Levodopa using Ni(II) and 2,3-Diaminopyridine

Table 7

Analytical results of LD in pure form and pharmaceutical preparations determined by spectrophotometry using the ternary complexation procedure.

Sample	Taken, μg·mL^−1	Found, μg·mL^−1	% recovery ± SD, (n = 6)	% SE	Present method	t-test	F-test
Pure drug	51015	4.9210.0214.84	99.4 ± 0.6100.2 ± 0.78.9 ± 0.3	0.240.290.12	100.01 ± 0.7; SE = 0.29; n = 6	1.78(2.228)	3.01(5.05)
Tablets	51015	4.919.9714.95	98.2 ± 0.399.7 ± 0.499.7 ± 0.9	0.120.160.37		1.91(2.228)	2.18(5.05)

Figures in parentheses are the tabulated values of t-test and F-test at 95% confidence limit.