Table 2.

The concentration (µg/g) of organic acids in packed tofu during storage at 4, 10 and 25 °C

Storage temp. (°C)	Storage days	Phytic acid	Oxalic acid	Citric acid	Lactic acid	Formic acid	Acetic acid
Packed tofu
4	0	17.25 ± 0.87a	2480.86 ± 258.51a	9.98 ± 0.85a	N.D.	60.26 ± 3.46a	N.D.
	3	6.32 ± 0.52b	973.18 ± 19.42b	5.51 ± 0.06b	30.00 ± 2.78ab	44.74 ± 1.18b	74.96 ± 1.24a
	6	4.51 ± 0.12d	740.45 ± 40.85c	3.27 ± 0.12c	23.45 ± 0.94bc	34.68 ± 0.41c	26.85 ± 2.86c
	9	5.07 ± 0.07cd	724.50 ± 9.93c	3.18 ± 0.15c	35.85 ± 1.01a	34.09 ± 0.69c	55.46 ± 2.77b
	12	4.91 ± 1.02cd	590.78 ± 111.87c	2.63 ± 0.52cd	16.99 ± 9.38c	26.43 ± 4.77d	19.73 ± 9.07c
	15	6.00 ± 0.28bc	569.51 ± 1.83c	2.32 ± 0.13d	20.74 ± 0.64c	32.96 ± 0.46c	11.90 ± 0.74d
10	0	17.25 ± 0.87a	2480.86 ± 258.51a	9.98 ± 0.85a	N.D.	60.26 ± 3.46a	N.D.
	3	6.05 ± 0.49b	679.76 ± 27.96b	3.18 ± 0.08b	17.71 ± 0.64d	31.95 ± 1.95b	12.73 ± 3.99e
	6	3.97 ± 0.16c	80.15 ± 3.65c	1.53 ± 0.05c	82.08 ± 0.37c	13.96 ± 0.60e	52.21 ± 15.2d
	9	4.34 ± 0.02c	99.06 ± 3.57c	0.68 ± 0.02d	148.47 ± 0.94a	17.72 ± 0.80d	135.69 ± 0.54b
	12	5.35 ± 0.75b	72.86 ± 6.37c	0.61 ± 0.05d	147.67 ± 17.27a	20.93 ± 1.62d	106.11 ± 8.49c
	15	5.46 ± 0.34b	N.D.	0.36 ± 0.02d	123.89 ± 0.46b	25.38 ± 2.09c	214.83 ± 11.81a
25	0	17.25 ± 0.87a	2480.86 ± 258.51a	9.98 ± 0.85a	N.D.	60.26 ± 3.46a	N.D.
	1	6.27 ± 0.12bc	714.85 ± 28.67b	3.00 ± 0.11b	103.99 ± 2.56b	35.13 ± 1.39b	142.75 ± 8.21b
	2	5.51 ± 0.96c	387.38 ± 56.02c	1.55 ± 0.18c	331.91 ± 51.98a	14.67 ± 3.95d	76.79 ± 17.65c
	3	7.17 ± 0.41b	104.65 ± 79.87d	0.09 ± 0.00d	80.99 ± 5.21b	23.82 ± 0.50c	70.38 ± 10.56c
	4	6.66 ± 0.29bc	28.83 ± 5.83d	0.37 ± 0.01d	3.89 ± 0.11c	26.68 ± 1.90c	73.60 ± 2.93c
	5	7.27 ± 0.76b	12.38 ± 1.58d	0.43 ± 0.19d	20.95 ± 1.63c	26.72 ± 1.02c	171.18 ± 14.50a