Synthesis of Modified Magnetic Graphene Oxide with Mesoporous Silica for Extraction of the Pharmaceutical Compound Quercetin

Table 5

Determination of quercetin in real samples.

Sample	Added (μg g^−1)	Found (μg g^−1)	Recovery (%)	RSD (n = 3)
Spinach	0	13.61	—	4.01
	5	18.36	95.00	2.43
	10	23.92	103.10	3.98
Green pepper	0	3.87	—	2.98
	1	4.81	94.00	4.49
	3	6.92	101.67	3.76
Red onion	0	5.71	—	4.21
	1	6.78	94.67	3.03
	3	8.55	107.00	3.20
Dill weed	0	9.93	—	2.88
	2	11.98	102.50	2.74
	5	14.65	94.40	3.06