The herb and fruits of Leonurus japonicus Houtt., named "Yimucao" and "Chongweizi", respectively, in Chinese, have been widely used in China as gynecological medicines. The components of the essential oils obtained by hydrodistillation were investigated by GC-MS. The antibacterial activity of the essential oils was determined by micro-dilution assay. The results showed large variations in the c...

The secondary organic aerosol (SOA) yield of βcaryophyllene photooxidation is enhanced by aerosol acidity. In the present study, the influence of aerosol acidity on the chemical composition of β-caryophyllene SOA is investigated using ultra performance liquid chromatography/electrospray ionization-time-of-flight mass spectrometry (UPLC/ESI-TOFMS). A number of first-, secondand higher-generation...

Alpinia monopleura is an endemic plant which widespread and abundant in Sulawesi. Nevertheless, previous studies have not studied the chemical compound biological activity. This study describes compounds antibacterial antioxidant properties of essential oils isolated from A. monopleura. The oil was obtained by hydro distillation method interpreted GCMS. Antibacterial were determined agar diffus...

Background and objectives: Humulus lupulus, a plant belonging to the family Cannabaceae, is used as a medicinal plant with therapeutic applications in different nations. In this study, two samples of H. lupulus (vernalized and wild hops) were selected for further analysis about differences of their essential oils. Methods: The essential oils f...

The chemical composition of Porella arboris-vitae extracts was determined by solid phase microextraction, gas chromatography-mass spectrometry (SPME GC-MS), and 66 constituents were identified. The dominant compounds in methanol extract of P. arboris-vitae were β-caryophyllene (14.7%), α-gurjunene (10.9%), α-selinene (10.8%), β-elemene (5.6%), γ-muurolene (4.6%), and allo-aromadendrene (4.3%) a...

BACKGROUND Vietnam 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. RESULTS In this study, the chemical compositions of essential oils of four Hedychium specie...

A degradation mechanism for β-caryophyllene has recently been released as part of version 3.2 of the Master Chemical Mechanism (MCM v3.2), describing the gas phase oxidation initiated by reaction with ozone, OH radicals and NO3 radicals. A detailed overview of the construction methodology is given, within the context of reported experimental and theoretical mechanistic appraisals. The performan...

The influence of second-generation products on the particle mass yield of β-caryophyllene ozonolysis was systematically tested and quantified. The approach was to vary the relative concentrations of firstand secondgeneration products by adjusting the concentration of ozone while observing changes in particle mass yield. For all wallloss corrected organic particle mass concentrations Morg of thi...

Tinh dầu từ lá và thân rễ của loài Asarum geophyllum Merr., thu mẫu tại xã Đức Quang, Hạ Lang, Cao Bằng, được chưng cất bằng phương pháp lôi cuốn hơi nước có hồi lưu. Hàm lượng tinh đạt 0,16% 0,12% (theo nguyên liệu khô không khí). màu trắng, nặng hơn nước. Bằng sắc ký khí khối phổ (GC/MSD), 47 cấu tử chiếm 97,17% tổng đã xác định. Những thành phần chính gồm: β-caryophyllene (11,91%), 9-epi-β-c...