Identification and Quantification of Aldose Reductase Inhibitory Flavonoids in Herbal Formulation and Extract of Gymnema sylvestre Using HPLC-PDA and LC-MS/MS

Table 1

Linearity and regression data.

Compounds	Retention time (min)	Regression equation		Linearity range; (g/mL)
Rutin	5.29		0.992	60–140
Quercetin	5.97		0.997	35–85
Kaempferol	6.34		0.995	30–70