Supplementary Table 6.

Results of long-term stability of all analytes (n = 6).

Analytes	Concentration (ng/mL)	Mean ± SD	RSD	RE
Chlorogenic acid	5	4.906 ± 0.166	3.38%	−1.87%
	50	51.665 ± 1.135	2.20%	3.33%
	500	486.234 ± 6.641	1.37%	−2.75%
Hydroxysafflor yellow A	5	4.926 ± 0.445	9.02%	−1.47%
	50	52.330 ± 3.583	6.85%	4.66%
	500	459.868 ± 17.911	3.89%	−8.03%
Hyperoside	5	5.524 ± 0.158	2.87%	10.49%
	50	51.942 ± 2.597	5.00%	3.88%
	500	446.621 ± 9.428	2.11%	−10.68%
Kaempferol-3-O-glucoside	5	5.384 ± 0.124	2.31%	7.69%
	50	53.701 ± 1.321	2.46%	7.40%
	500	447.438 ± 13.203	2.95%	−10.51%
Kaempferol-3-O-rutinoside	5	5.381 ± 0.118	2.20%	7.63%
	50	54.438 ± 0.739	1.36%	8.88%
	500	449.835 ± 15.067	3.35%	−10.03%
N-acetyl-L-glutamine	5	5.314 ± 0.334	6.29%	6.29%
	50	50.765 ± 3.523	6.94%	1.53%
	500	482.449 ± 8.508	1.76%	−3.51%
p-Coumaric acid	5	5.332 ± 0.157	2.95%	6.44%
	50	51.732 ± 2.278	4.40%	3.46%
	500	456.425 ± 12.555	2.75%	−8.72%
Rutin	5	5.034 ± 0.171	3.40%	0.69%
	50	51.383 ± 1.524	2.97%	2.77%
	500	451.281 ± 5.824	1.29%	−9.74%