The chemical constituents of essential oil of Amomum villosum Lour stem grown in Vietnam was investigated by gas chromatography (GC-FID) and gas chromatography-mass spectrometry (GC-MS). The essential oil was obtained by hydrodistillation. The yield of the essential oil was 0.21% (v/w) calculated on a dry weight basis. The GC/MS analysis of the essential oil revealed the identification of 36 compounds in which β-pinene (48.1%), α-pinene (16.9%) and methyl chavicol (7.0%) were the main constituents of the essential oil. The present result is the first of its kind aimed at the characterization of the chemical composition essential oil from the stem of A. villosum. Manuscript profile

In this paper, chemical constituents and antimicrobial activity of essential oil from the pseudo-stem of Zingiber castaneum Škorničk. & Q.B. (Zingiberaceae) Nguyễn growing in Vietnam havw been reported. Essential oils were obtained by hydrodistillation using the Clevenger-type apparatus. Chemical components of the essential oil were analyzed by gas chromatography (GC) and gas chromatography coupled with mass spectrometry (GC/MS). The minimum inhibitory concentrations (MIC) were evaluated by the method of microdilution broth susceptibility assay. The main constituents of the oil were bicyclo germacrene (28, 15.8%), cis-β-elemene (18, 9.8%) and germacrene D (26, 9.2%). The pseudo-stem oil of Z. castaneum displayed antimicrobial activity against Pseudomonas aeruginosa (ATCC 25923), Aspergillus niger (ATCC 9763) and Fusarium oxysporum (ATCC 48112) with MIC values of 12.5 ± 0.57 μg/mL, 50 ± 1.00 μg/mL and 50 ± 0.50 μg/mL, respectively. The results indicate the potential of Z. castaneum essential oil as a source of antimicrobial agent. Manuscript profile

The chemical constituents, anti-inflammatory and anti-nociceptive activities of the leaf essential oil hydrodisitlled from the Gardenia jasminoides J. Ellis (Rubiaceae) were reported. The chemical constituents of the essential were analyzed using gas chromatography-flame ionization detector (GC-FID) and gas chromatography coupled with mass spectrometry (GC/MS). The hot plate and carrageenan-induced models were used to determine the anti-nociceptive and anti-inflammatory activities. The main compounds of the oil were pentadecanal 17 (49.2%), geranial 4 (12.3%), ar-turmerone 14 (8.2%) and 10-epi-γ-eudesmol 10 (6.2%). The essential oil of G. jasminoides at 100 and 400 mg.kg-1 doses significantly (p < 0.001) increased the latency period for the reaction duration in the anti-nociceptive study. The carrageenan-induced edema model reveals the suppression of inflammatory mediators (p < 0.001) within 1st, 2nd and 4th h for 100 mg.kg-1 dose, 1st and 4th h (200 mg.kg-1) and 1st-3rd h (400 mg.kg-1). The results indicate the potential of G. jasminoides essential oil as a source of pain relieving agent. Manuscript profile