Determination of Nanogram Quantities of Emodin in Pharmaceutical Preparations and Biofluids by Luminol-Myoglobin Chemiluminescence System

Table 1

Results of emodin determination in SANHUANG tablets.^a

Sample no.	Added/found (ng·mL^−1)	RSD (%)	Recovery (%)	Content^b (%)
1	0/2.5	2.1	105.0	0.68
	2.0/4.7	1.5
2	0/2.4	2.2	96.7	0.67
	3.0/5.3	2.3
3	0/2.5	2.0	102.0	0.69
	5.0/7.6	1.7
4	0/5.6	2.2	93.3	0.67
	3.0/8.3	1.6
5	0/5.6	2.3	94.0	0.68
	5.0/10.3	1.5
6	0/5.7	2.4	102.5	0.68
	8.0/13.7	1.4

^aThe average of five determinations.
^bPer tablet weight: 425 ± 10 mg.