BackgroundVietnam is a country blessed with many medicinal plants widely used as food and for medicinal purposes, and they contain a host of active substances that contribute to health. However, the analysis of chemical constituents of these plant species has not been subject of literature discussion.ResultsIn this study, the chemical compositions of essential oils of four Hedychium species, obtained by hydrodistillation, were determined by means of gas chromatography-flame ionization detector (GC-FID) and gas chromatography–mass spectrometry (GC-MS) techniques. Individually, α-pinene (52.5%) and β-pinene (31.8%) were present in the leaf oil of Hedychium stenopetalum Lodd., while linalool (45.2%), (E)-nerolidol (8.7%) and α-pinene (5.0%) were identified in the root. The leaf of Hedychium coronarium J. König was characterized by β-pinene (20.0%), linalool (15.8%), 1,8-cineole (10.7%), α-pinene (10.1%) and α-terpineol (8.6%); while β-pinene (23.6%), α-humulene (17.1%) and β-caryophyllene (13.0%) were identified in the root. Hedychium flavum Roxb., gave oil whose major compounds were β-pinene (22.5%), α-humulene (15.7%) and β-caryophyllene (10.4%) in the leaf; α-humulene (18.9%), β-caryophyllene (11.8%) and β-pinene (11.2%) in the stem, as well as β-pinene (21.8%), linalool (17.5%) and 1,8-cineole (13.5%) in the root. The main constituents of Hedychium ellipticum Buch.-Ham. ex Smith were (E)-nerolidol (15.9%), β-pinene (11.8%) and bornyl acetate (9.2%) in the leaf with 1,8-cineole (40.8%), α-pinene (18.3%) and β-pinene (11.0%) occurring in the root.ConclusionsUbiquitous monoterpenes and sesquiterpenes were identified as characteristic markers for Hedychium species. This work is of great importance for the evaluation of Hedychium essential oils grown in Vietnam.Electronic supplementary materialThe online version of this article (doi:10.1186/s13065-014-0054-3) contains supplementary material, which is available to authorized users.
A phytochemical investigation of an ethyl acetate fraction of Mahonia bealei trunks led to the isolation of three new and four known compounds. By means of NMR and MS spectroscopic methods, the structure of the new compounds was elucidated as bishexadecyl epiphyllate (1), 3-(4-hydroxy-3,5dimethoxyphenyl)-3-ethoxy-2-sulfopropane-1-ol (2), and 6α-acetoxystigmastan-3β-ol (3).
Conamomum pierreanum (Gagnep.) Skornick. & A. D. Poulsen, (Zingiberaceae), a previously known species from Thailand and Cambodia, is here reported, as a new record for Vietnam. It is similar to C. rubidum and C. odorum but differs in having a present stilt root; a shorter petiole, 2-3 cm; a larger leaf blade, oblong, 30-50 × 5-8 cm, glabrous; a globose to ovoid inflorescence, arising near the base of rhizome; tomentose outer surface of bract; a 3-toothed bracteole, outer surface hairy; and a smaller filament, yellowish and glabrous. The detailed morphological description, distribution and ecology information, conservation status and a colour plate of this species are given.
1Viện Sinh thái và Tài nguyên sinh vật, Viện Hàn lâm KH & CN Việt Nam, *thanhbv2001@gmail.com 2 Trường Đại học Tân Trào, Tuyên Quang TÓM TẮT: Tinh dầu từ thân của loài Ngũ vị tử vảy chồi (Schisandra perulata Gagnap.) thu ở huyện Bát Xát, tỉnh Lào Cai là dung dịch đồng nhất, có màu vàng nhạt, hàm lượng đạt 0,31% (theo nguyên liệu khô tuyệt đối). Bằng phương pháp sắc ký khí-khối phổ (GC/MS) đã tách và xác định được 45 hợp chất, chiếm 95, 21% tổng hàm lượng tinh dầu. Các thành phần có tỷ lệ lớn trong tinh dầu từ thân loài Ngũ vị tử vảy chồi là zingiberene (chiếm 14,77%), cadinene
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