Table 4.

The content of titratable acidity (g citric acid /100 ml) in blank and optimal samples during storage

Treatment	Temperature	Time(days)
		0	20	40	60
blank	refrigerator	0.695 ± 0.000 a(B)	0.720 ± 0.000 b(B)	0.740 ± 0.005 c(B)	0.856 ± 0.005 d(C)
blank	ambient	0.695 ± 0.000 a(B)	0.730 ± 0.000 b(A)	0.752 ± 0.003 c(A)	0.931 ± 0.001 d(A)
optimal	refrigerator	0.708 ± 0.000 a(A)	0.730 ± 0.000b(A)	0.737 ± 0.003 c(B)	0.865 ± 0.004 d(B)
optimal	ambient	0. 707 ± 0.003 a(A)	0.733 ± 0.004 b(A)	0.744 ± 0.006 c(B)	0.938 ± 0.002 d(A)

Values with different letters (capital letters in each column and minuscule letters in each row) represent significant difference at the confidence level of 99 %