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Zingiber  is a genus of medicinal plants containing a rich resource of essential oils. The current study aims to describe chemical analysis and antimicrobial assay for two  Zingiber  species  Zingiber eberhardtii  Gagnep. and  Z. skornickovae  N.S. Lý. The rhizome oils, which were obtained by hydro-distillation using a Clevenger apparatus, were analyzed by GC-MS (gas chromatography-mass spectrometry). Extraction of  Z. eberhardtii  rhizome gave a yellow oil with 41 identified compounds (96.3%), in which linalool (34.9%) and 1,8-cineole (12.7%) were the principal compounds. The yellow oil of  Z. skornickovae  rhizome included 53 identified compounds (97.8%), with β-pinene (25.0%), ( E )-caryophyllene (8.8%), and α-pinene (7.9%) as the major agents. By broth dilution method, both oils moderately controlled the growth of Gram (+) bacteria  Bacillus subtilis  ATCC 6633 and  Staphylococcus aureus  ATCC 25923 with the same MIC (minimum inhibitory concentration) value of 128 μg/mL. In particular,  Z. skornickovae  rhizome oil showed the best antimicrobial activity against yeast  Saccharomyces cerevisiae  ATCC 4098 with a MIC value of 64 μg/mL. The obtained results are promising information for future research.

Essential oils of two Zingiber plants Zingiber eberhardtii Gagnep. and Zingiber skornickovae N.S. Lý: Chemical profiles and antimicrobial effects