Development and Validation of RP-HPLC Method for Quantitative Estimation of Vinpocetine in Pure and Pharmaceutical Dosage Forms

Table 4

Intraday and interday precision of HPLC method.

Sr. no.	Concentration (μgmL^−1)	Standard solution		Sample solution
		Intra-day precision	Inter-day precision	Intra-day precision	Inter-day precision
1	200	3479501	3484566	3481332	3489214
2	200	3479005	3484112	3481987	3489741
3	200	3478987	3483991	3482244	3490301
4	200	3479227	3484977	3481510	3489748
5	200	3479808	3485004	3481993	3489849
6	200	3479777	3484669	3482214	3490488
Mean		3479384	3484553	3481880	3489890
SD		367.100	425.941	375.626	453.331
%RSD		0.011	0.012	0.011	0.013