Hardness measured by the work (Joules) required to push the anvil of a penetrometer over 6.25 mm in gels prepared with different agars in different concentrations


AGAR BRAND

CONCENTRATION (%)

0.6

0.8

1

1.5

2

Difco Bacto

4.65

9.83

18.33

37.37

53.35

Difco Noble

5.52

11.21

18.77

39.86

72.46

Difco Purified

9.48

17.02

25.99

48.82

80.36

Gibco Phytagar

26.81

46.63

63.17

89.75

169.00

Flandria

6.22

15.42

27.41

46.54

73.78

Tayio

6.40

19.13

29.05

59.14

102.74

Merck

21.81

42.05

61.38

97.06

149.49