Table 2: Antibacterial potential of the essential oils of leaves and rhizome of Alpinia spp.

Strains Alpinia calcarata
Leaf Oil
Alpinia calcarata
Rhizome Oil
Alpinia zerumbet
leaf oil
Alpinia zerumbet
Rhizome Oil
ZOI
(mm)
MICs
(μg/mL)
ZOI
(mm)
MICs
(μg/mL)
ZOI
(mm)
MICs
(μg/mL)
ZOI
(mm)
MICs
(μg/mL)
Staphylococcus aureus (MTCC-96) 7 500 10 250 6 500 9 500
Staphylococcus aureus (MTCC-2940) 5 1000 8 250 5 1000 12 250
Bacillus subtilis (MTCC-121) 6 1000 7 250 7 1000 14 250
Staphylococcus epidermidis (MTCC- 435) 5 1000 11 125 10 500 11 500
Streptococcus mutans(MTCC-890) 14 500 11 250 5 1000 14 250
Klebsiellapneumoniae(MTCC-109) 6 1000 14 125 na 500 8 500
Escherichia coli (MTCC-723) 6 1000 12 250 na 1000 6 1000
Salmonella typhimurium (MTCC 98) 7 500 na 500 7 500 5 1000