Parameter

Squash

Plain grape RTS

Grape-purple grape blend

Grape-phalsa blend

1

2

1

2

1

2

 

0 days

°Brix

45.0 ± 0.2

15.0 ± 0.1

15.0 ± 0.1

18.0 ± 0.10

18.0 ± 0.1

18.0 ±0.11

20.0 ±0.22

Acidity, %

0.75 ± 0.01

0.14 ± 0.02

0.15 ± 0.02

0.22 ± 0.04

0.23 ± 0.01

0.19 ± 0.01

0.21 ± 0.03

pH

2.45 ± 0.01

2.94 ± 0.02

3.02 ± 0.01

3.01 ± 0.01

3.13 ± 0.01

3.25 ± 0.02

3.17 ± 0.02

Reducing sugars, %

42.1 ± 0.25

13.80 ± 0.02

13.90 ± 0.36

6.74 ± 0.05

5.85 ± 0.01

5.29 ± 0.05

6.82 ± 0.04

Total Sugars, %

44.8 ± 0.25

13.80 ± 0.05

13.46 ± 0.11

17.87 ± 0.12

17.80 ± 0.04

18.0 ± 0.07

19.1 ± 0.06

 

6 months

°Brix

46.0 ± 0.2

15.0 ± 0.1

15.0 ± 0.1

18.0 ± 0.05

18.0 ± 0.07

18 ±0.05

20.2 ±0.12

Acidity, %

0.72 ± 0.03

0.14 ± 0.01

0.14 ± 0.02

0.20 ± 0.01

0.22 ± 0.06

0.18 ± 0.10

0.20 ± 0.11

pH

2.35 ± 0.02

3.26 ± 0.01

3.16 ± 0.01

3.01 ± 0.01

3.12 ± 0.03

3.20 ± 0.07

3.11± 0.02

Reducing sugars, %

42.6 ± 0.4

14.31 ± 0.07*

14.27 ± 0.4*

9.74 ± 0.05*

8.92 ± 0.11*

8.29 ± 0.02*

9.12 ± 0.04*

Total Sugars, %

45.2 ± 0.2

14.76 ± 0.24

14.92 ± 0.32

17.87 ± 0.12

17.90 ± 0.14

18.0 ± 0.12

20.1 ± 0.057


Values are mean of triplicates ± SD
Table 3: Chemical analysis of squash and RTS beverages from sour grapes during storage.