TABLE 5.

Titanium concentrations in soybean curd subjected to POH treatment under each condition for the maximum treatment times^a

Duty ratio	Applied voltage (Vrms)	Titanium concn (ppm)
0.05	48	NDb
0.1	48	ND
	60	0.02 ± 0.11
	70	ND
	80	ND

^aData are expressed as means ± standard deviations from three replications. The maximum treatment times were 490, 310, 200, and 160 s at 48, 60, 70, and 80 V_rms, respectively.

^bND, not detected.