Fig. 2From: Optimization of extraction parameters of PTP1β (protein tyrosine phosphatase 1β), inhibitory polyphenols, and anthocyanins from Zea mays L. using response surface methodology (RSM)Lineweaver-Burk plots of the inhibitory effect of compounds on PTP1β -catalyzed hydrolysis of pNPP, respectively. Data are expressed as the mean substrate concentration of compound 7 (a) and 11 (b)Back to article page