A Sensitive Fluorescent Immunoassay for Prostate Specific Antigen Detection Based on Signal Amplify Strategy of Horseradish Peroxidase and Silicon Dioxide Nanospheres

Table 1

Recovery results of PSA in human serum samples (n = 9).

Serum sample	Added (ng·mL^−1)	Found^a (ng·mL^−1)	Recoveries (%)
1	0.03	0.0315	105.0
2	0.05	0.0521	104.2
3	0.1	0.1026	102.6
4	0.5	0.4805	96.1
5	1.0	0.9881	98.8
6	5.0	4.9558	99.1
7	10.0	10.214	102.1
8	50.0	48.786	97.6
9	100.0	96.366	96.4

^aMean value ± SD of five measurements serum sample.