Comparison of Chemical Composition and Bioactivities of Essential Oils from Fresh and Dry Rhizomes of Zingiber zerumbet (L.) Smith
Table 3
Diameter of the inhibition zones of Z. zerumbet FR-EO, DR-EO, and zerumbone using the agar disc diffusion method.
Microorganisms
Diameter of the inhibition zones (mm)a
FR-EO
DR-EO
Zerumbone
Streptomycin
Gram positive
Enterococcus faecalis ATCC 29212
10.41 ± 2.31
9.31 ± 0.69
10.00 ± 0.68
9.74 ± 0.96
Staphylococcus aureus ATCC 6538P
14.54 ± 3.78
12.31 ± 1.22
15.72 ± 2.42
19.69 ± 1.63
Bacillus subtilis CMCC (B) 63501
9.99 ± 1.86
8.55 ± 1.89
9.48 ± 1.96
9.38 ± 1.21
Gram negative
Pseudomonas aeruginosa CMCC (B) 10104
8.34 ± 0.70
8.23 ± 1.17
9.71 ± 0.97
8.36 ± 1.08
Escherichia coli ATCC 25922
9.36 ± 1.98
9.79 ± 1.68
10.85 ± 0.83
11.37 ± 0.88
Proteus vulgaris CMCC (B) 49027
11.06 ± 1.01
10.29 ± 1.03
11.71 ± 1.55
17.13 ± 2.14
Fungus
Candida albicans CMCC (F) 98001
10.93 ± 1.13
9.31 ± 1.80
11.31 ± 0.83
Na
aThe diameter of the inhibition zones (mm) were measured including the diameter of the disk (6 mm). The sample solution: FR-EO, DR-EO, and zerumbone were diluted with ethyl acetate, at a concentration of 100 mg/mL (tested volume: 20 μL); positive control: streptomycin (tested volume: 20 μL, 100 μg/mL).
