Seasonal Variation in Essential Oil Compositions and Antioxidant Properties of Acorus calamus L. Accessions.

(Sweet flag) is a known herbal drug commonly used in traditional medicine. Our aim was to perform seasonal and altitudinal phytochemical screening to assess the antioxidant activity of the essential oils in the rhizome and leaves of from three different altitudes. Phytochemical screening was performed using GC/MS analysis and in vitro antioxidant assay was done by different methods.

β-Selinene-Rich Essential Oils from the Parts of Callicarpa macrophylla and Their Antioxidant and Pharmacological Activities.

(Varbenaceae) is a medicinal shrub and is traditionally used in India, China, and South Asia. The plant material was collected from lower Himalayan region of Uttarakhand in India. The essential oils from three different aerial parts were analyzed by GC-MS.

neo-Clerodane Diterpenoids from Ajuga macrosperma var. breviflora.

Six new naturally occurring ajugarin-like neo-clerodane diterpenoids, ajugaflorins A-F, along with six known compounds [the parent ajugarin I, ajugalides B and C, ajugamarin F4, ajugamacrin E, and ajugatakasin B] were isolated from A. macrosperma var. breviflora.

Chemical diversity in Mentha spicata: antioxidant and potato sprout inhibition activity of its essential oils.

The essential oils from fresh aerial parts of Mentha spicata L. collected from ten different natural habitats of Uttarakhand, India were analyzed by a combination of GC, GC/MS and NMR spectroscopy. The analysis revealed that monoterpenoids (46.

Chemical diversity in Himalayan Elsholtzia species.

The terpenoid composition of essential oils from the leaves of five Elsholtzia species, viz., E. eriostachya Benth.

Phytoecdysteroids from Ajuga macrosperma var. breviflora roots.

Three new phytoecdysteroids, ajugacetalsterones C (1) and D (3) and breviflorasterone (2), were isolated from the roots of Ajuga macrosperma var. breviflora along with five known compounds, namely, 20-hydroxyecdysone, cyasterone, makisterone A, 20-hydroxyecdysone 3-acetate, and 20-hydroxyecdysone 2-acetate. The structures of 1-3 were elucidated on the basis of extensive 1D and 2D NMR spectroscopic studies.

Terpenoid compositions, and antioxidant and antimicrobial properties of the rhizome essential oils of different Hedychium species.

A phytochemical study of the rhizome essential oils of four different Hedychium species was performed by means of GC and GC/MS analyses. H. ellipticum mainly contained 1,8-cineole, sabinene, and terpin-4-ol, while H.

Compositional diversity of terpenoids in the Himalayan Valeriana genera.

In an effort to determine the chemical diversity of the Valeriana genera of the Northwestern Himalaya (Uttaranchal), V. wallichii, V. himalayana (syn.