Table 5
pH, optical density, polyphenol and flavonoid contents of residual water after blanching in Aster scaber in response to different salt concentrations and blanching times

Blanching solutes1)	pH	Optical density		Polyphenols (mg%)	Flavonoids (mg%)
		OD420 nm	OD660 nm
		Non-treated	6.18±0.01b2)			0.353±0.002b	0.036±0.001a	11.79±0.08b	7.34±0.13a
Sol-Ca	6.01±0.01d	0.184±0.001d	0.009±0.001d	12.68±0.41a	6.54±0.06b
NaHCO3	9.07±0.01a	2.633±0.002a	0.031±0.002b	13.12±0.22a	5.64±0.03c
MgSO4	6.08±0.01c	0.216±0.003c	0.016±0.002c	10.65±0.32c	5.30±0.10d

Abbreviations: Non-treated, water blanching; Sol-Ca, 0.1% soluble calcium; NaHCO₃, 0.1% soium bicarbonate; MgSO₄, 0.1% magnesium sulfate
Values are mean±standard deviation of triplicate determinations. Different superscripts within a column (a-d) indicate significant differences (p<0.05)