Ultrasensitive Detection of Ferulic Acid Using Poly(diallyldimethylammonium chloride) Functionalized Graphene-Based Electrochemical Sensor

Table 2

Detection of FA in Angelica sinensis and in urine samples (𝑛=3).

Sample	Content/μg mL^−1	Detected/μg	Spiked/μg	Recovery/%	RSD/%
A. sinensis
1	1.65	32.78	16.02	101.75	3.72
2	1.61	31.36	15.86	96.09	2.46
3	1.70	32.87	15.48	102.39	4.25
Urine
1	0.55	5.54	5.58	99.28	0.37
2	1.15	11.45	11.68	98.03	1.37
3	1.72	17.19	16.89	101.78	4.72
4	3.29	32.91	33.24	99.01	4.96