Table 5 Analysis of variance (ANOVA) results for TPC, TFC, DPPH and ΔE of Cudrania tricuspidata under blanching and hot air drying

	Model	R2	Blanching time (sec)	Drying temp (°C)	Drying time (h)	Stationary point
TPC1)	5.36**2)	0.9061	7.60**	3.05	4.55*	saddle point
TFC	7.63**	0.9186	1.15	11.54**	7.63**	maximum
DPPH	7.42**	0.9303	2.12	10.28**	5.94**	saddle point
△E	24.91**	0.9782	5.69**	39.27***	48.04**	saddle point

TPC, total polyphenol content; TFC, total flavonoid content; DPPH, DPPH radical scavenging activity; ΔE, Color difference.
*** p<0.001, ** 0.001<p<0.05, * 0.05<p<0.1.