Killing kinetics and bactericidal mechanism of action of Alpinia galanga on food borne bacteria | Zendy

Siriporn Okonogi | Zendy; Prakatthagomol Waranee | Zendy; Chadarat Ampasavate | Zendy; Klayraung Srikanjana | Zendy

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Killing kinetics and bactericidal mechanism of action of Alpinia galanga on food borne bacteria

Author(s) -

Siriporn Okonogi,

Prakatthagomol Waranee,

Chadarat Ampasavate,

Klayraung Srikanjana

Publication year - 2011

Publication title -

african journal of microbiology research

Language(s) - English

Resource type - Journals

ISSN - 1996-0808

DOI - 10.5897/ajmr10.396

Subject(s) - bacteria , chemistry , essential oil , gentamicin , microbiology and biotechnology , food science , gram positive bacteria , preservative , bacterial cell structure , antibacterial activity , kinetics , antibiotics , biology , biochemistry , genetics , physics , quantum mechanics

The aim of this study was to explore the killing kinetics and bactericidal mechanism of action of A. galanga against food borne bacteria in order to promote this plant as a source of natural preservative. The comparison on antibacterial power was firstly done among its essential oil and the crude extracts obtained from various extracting solvents. The essential oil showed the extremely strongest antibacterial activity and more effective killing activity against Gram negative than Gram positive food borne bacteria. The kinetic time of the oil for complete bactericidal action against E. coli was 40 min whereas that of gentamicin was 120 min. The scanning electron microscopy (SEM) of bacterial morphology after exposed to the oil showed bacterial membrane destruction. It was concluded that the essential oil is the highest potential part of A. galanga against food borne bacteria. Its killing kinetics against Gram negative bacteria was extremely faster than a broad spectrum antibiotic gentamicin. Its mechanism of bactericidal action was along with the bacterial membrane disruption and malfunction leading to cell death.

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