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Table 1 Yield of extract, minimum inhibitory concentration (MIC) and total antibacterial activity (TAA) of the nine selected acetone leaf extracts against Gram-positive test bacteria. Values equal to or less than 0.1 mg/ml indicate high activity

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

 

Enterococcus faecalis

Bacillus cereus

Staphylococcus aureus

Plant

% yield

MIC (mg/ml)

TAA (ml/g)

MIC (mg/ml)

TAA (ml/g)

MIC (mg/ml)

TAA (ml/g)

Eugenia erythrophylla

18.50

0.31 ± 0.00

591.05

0.02 ± 0.00

9250.00

0.08 ± 0.00

2371.79

Eugenia natalitia

9.40

0.08 ± 0.00

1205.13

0.08 ± 0.00

1205.13

0.16 ± 0.00

602.56

Eugenia woodii

9.80

0.63 ± 0.00

156.80

0.16 ± 0.00

628.21

0.08 ± 0.00

1256.41

Eugenia umtamvunensis

8.77

0.16 ± 0.00

561.97

0.04 ± 0.00

2247.86

0.08 ± 0.00

1123.93

Eugenia zeyheri

25.33

1.25 ± 0.00

202.67

0.08 ± 0.00

3247.86

0.08 ± 0.00

3247.86

Syzygium legatii

9.23

0.08 ± 0.00

1183.76

0.03 ± 0.01

2797.98

0.08 ± 0.00

1183.76

Syzygium masukuense

10.50

0.04 ± 0.00

2692.31

0.08 ± 0.00

1346.15

0.16 ± 0.00

673.08

Syzygium species A

10.65

0.04 ± 0.00

2730.77

0.16 ± 0.00

682.69

0.04 ± 0.00

2730.77

Syzygium gerrardii

17.00

0.16 ± 0.00

1088.00

0.04 ± 0.00

4352.00

0.08 ± 0.00

2176.00

Gentamicin

NA

0.002

NA

0.0005

NA

0.00013

NA

Average for extracts

NA

0.3 ± 0.38

NA

0.08 ± 0.05

NA

0.09 ± 0.04

NA

  1. The values in bold indicate good activity