Table 4. Changes in the titrable acidity of grapes during the storage of phytoncide treatment derived from pine bark

(unit: %)

Storage period (day) Control Sulfur dioxide Pad Phytoncide pad 1 Phytoncide pad 2

0 0.33±0.05^d¹⁾ 0.34±0.05^d 0.32±0.05^c 0.31±0.05^c

3 0.48±0.05^c 0.47±0.05^c 0.36±0.02^c 0.35±0.07^b^c

6 0.75±0.02^a 0.71±0.04^a 0.47±0.03^b 0.51±0.05^a

9 0.62±0.03^b 0.58±0.03^b 0.57±0.05^a 0.54±0.04^a

12 0.34±0.05^d 0.54±0.04^b 0.50±0.06^a^b 0.41±0.04^b

¹⁾^a^-^bMeans within column with different superscripts are significantly different (p<0.05).

Storage period (day)	Control	Sulfur dioxide Pad	Phytoncide pad 1	Phytoncide pad 2
0	0.33±0.05^d¹⁾	0.34±0.05^d	0.32±0.05^c	0.31±0.05^c
3	0.48±0.05^c	0.47±0.05^c	0.36±0.02^c	0.35±0.07^b^c
6	0.75±0.02^a	0.71±0.04^a	0.47±0.03^b	0.51±0.05^a
9	0.62±0.03^b	0.58±0.03^b	0.57±0.05^a	0.54±0.04^a
12	0.34±0.05^d	0.54±0.04^b	0.50±0.06^a^b	0.41±0.04^b