Structural and Quantitative Analysis of Three C-Glycosylflavones by Variable Temperature Proton Quantitative Nuclear Magnetic Resonance

Table 1

Linearity, range, and precision of schaftoside calculated by VT-¹H-qNMR (348 K).

Linearity and range				Precision				Repeatability
Sample	(mg/mL)	(mg/mL)		Sample	(mg/mL)	(mg/mL)	(%)	No.	(%)
1	5.48	5.01	0.0759	1	4.64	19.46	93.51	1	94.42
2	5.44	10.40	0.1334	2	5.17	20.00	94.17	2	93.91
3	4.78	14.82	0.2201	3	5.34	20.11	93.89	3	94.15
4	5.84	18.98	0.2296	4	4.74	19.97	93.07	4	93.58
5	5.28	30.09	0.4015	5	4.73	19.98	94.16	5	93.99
				6	5.84	18.98	94.42
	0.998				—				—
RSD (%)	—				0.53				0.33