Table 1. Pancreatic lipase apparent catalytic parameters (vmax, Km, Ki and Ki´) and IC50 of the hydrolysis of pNPL in the presence of different polyphenolic compounds, capsaicin and orlistat.
Compound | c/µM | vmax/(µM/s) | Km/µM | Ki/µM | Ki´/µM | IC50/µM |
---|---|---|---|---|---|---|
pNPL (control) | 11.7-124.2 | (0.11±0.03)a | (1.96±0.20)ab | n.d. | n.d. | n.d. |
Caffeic acid | 300.21 | (0.10±0.02)a | (0.30±0.06)d | (370.2±18.4)a | (388.2±30.2)a | (401.5±32.1)a |
p-Coumaric acid | 275.00 | (0.10±0.01)a | (0.95±0.10)c | (205.7±44.1)b | (290.7±39.7)b | (170.2±20.6)b |
Quercetin | 14.53 | (0.10±0.02)a | (2.15±0.40)a | (12.0±4.4)d | (17.9±6.9)d | (6.1±2.4)c |
Capsaicin | 40.47 | (0.10±0.02)a | (1.80±0.19)b | (66.0±14.3)c | (50.7±13.0)c | n.d. |
Orlistat | 9.68 | (0.09±0.03)a | (0.30±0.05)d | (16.9±4.8)d | (19.0±2.8)d | (4.0±1.0)c |
The data are presented as mean value±standard deviation of triplicate analyses. Different letters in the same row indicate statistically significant values (Fisher’s least significant difference analysis, p≤0.05) with respect to control, or between treatments for dissociation constant of free enzyme and enzyme-substrate complex (Ki and Ki´). Km=Michaelis-Menten constant, n.d.=not determined