Table 1.

Particle size, polydispersity index and zeta potential of untreated and US- treated resistant starch from lotus stem.

Sample	Power (W)	Hydrodynamic diameter	Polydispersity index (PI)	Zetapotential (mV)
RS	–	12.8 ± 0.09 µm	0.543 ± 0.34	−12.34 ± 0.38
URS1	100 W	765.11 ± 0.78 nm	0.413 ± 0.01	−14.09 ± 0.42
URS2	200 W	544.32 ± 1.23 nm	0.400 ± 0.05	−18.67 ± 0.01
URS3	300 W	413.19 ± 0.03 nm	0.342 ± 0.01	−20.18 ± 0.32
URS4	400 W	385.69 ± 0.15 nm	0.310 ± 0.32	−26.09 ± 0.99

Where PI = Polydispersity index; RS is the resistant starch from lotus stem; US is ultrasonication; URS1, URS2, URS3 and URS4 represent the resistant starch ultrasonicated at 100, 200, 300 and 400 W.