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Table 4 Effect of acetone crude leaf extracts of nine plants against biofilm formation by Gram-negative and Gram-positive bacteria. Inhibition of biofilm formed is expressed as percentage (%) biofilm inhibition. The numbers > 0% ≥ 50% show low activity, > 50% (in bold) show high activity against the bacteria. Negative values denote enhancement of biofilm [44]

From: Antibacterial and antibiofilm activity of acetone leaf extracts of nine under-investigated south African Eugenia and Syzygium (Myrtaceae) species and their selectivity indices

 

E. coli

P. aeruginosa

S. Typhimurium

E. faecalis

B. cereus

S. aureus

E. erythrophylla

83

76

88

41

80

83

E. natalitia

77

64

68

47

41

35

E. woodii

−10

58

49

−19

71

42

E. umtamvunensis

27

83

105

57

77

73

E. zeyheri

34

65

22

−104

74

83

S. legatii

100

59

100

71

85

86

S. masukuense

34

−62

84

125

44

− 155

S. species A

81

− 276

82

−96

97

−29

S. gerrardii

−15

−125

122

114

146

68

Gentamicin

83

75

81

88

84

96