Essential Oil Composition and Antimicrobial Activities of Two Closely Related Species, Alpinia mutica Roxb. and Alpinia latilabris Ridl., from Peninsular Malaysia
Table 2
Antimicrobial activity (MIC) of the unripe and ripe fruit oils of A. mutica and A. latilabris.
Microorganisms
MIC (mg/mL)*
A. mutica
A. latilabris
Standards
Unripe fruit oil
Ripe fruit oil
Unripe fruit oil
Ripe fruit oil
Oxacillin
Cycloheximide
Staphylococcus aureus (ATCC 25923)
2.50
2.50
2.50
5.00
0.20
n.t
Bacillus subtilis (ATCC 6633)
2.50
1.25
5.00
5.00
0.14
n.t
Escherichia coli (ATCC 8739)
>5.00
>5.00
>5.00
5.00
0.65
n.t
Pseudomonas aeruginosa (ATCC 27853)
>5.00
>5.00
>5.00
5.00
5.08
n.t
Candida glabrata (ATCC 64677)
>5.00
>5.00
>5.00
2.50
n.t
0.04
Microsporum canis (ATCC 36299)
5.00
2.50
5.00
5.00
n.t
1.88
Trichophyton mentagrophytes (ATCC 18748)
2.50
2.50
2.50
5.00
n.t
2.50
Trichophyton rubrum (ATCC 28188)
2.50
2.50
5.00
5.00
n.t
1.88
n.t = not tested. Weak (MIC 5.0 mg/mL), moderate (MIC 1 mg/mL–4.9 mg/mL), and strong (MIC 1 mg/mL).
