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Kanjilal P.B.,Northeast Institute of Science and Technology | Kotoky R.,Northeast Institute of Science and Technology | Couladis M.,National and Kapodistrian University of Athens
Journal of Essential Oil Research | Year: 2010

The essential oils of the leaves and rhizomes of Alpinia nigra (Gaertner) B.L.Burtt., family Zingiberaceae, were obtained by hydrodistillation and yielded 0.02% and 0.4%, respectively. The oils were analyzed for their chemical composition by capillary GC and GC/MS. A total of 18 compounds were identified representing about 96.4% of leaf and 97.8% of rhizome oils, respectively. 1,8-cineole was the major component in both leaf (25.4%) and rhizome (34%) oils. In addition, β-pinene (15.1%), camphor (15.3%), carotol (7.3%), α-pinene (7.8%) and camphene (7.0%) were also present in leaf oil, whereas in the rhizome oil α-fenchyl acetate (13.1%), α-terpineol (9.6%), β-pinene (8.1%) and camphene (7.0%) were the other main constituents. © 2010 Allured Business Media.


Hazarika B.K.,Northeast Institute of Science and Technology | Dutta D.K.,Northeast Institute of Science and Technology
Synthetic Communications | Year: 2011

(Chemical Equation Presented) Vicinal diols have been prepared in good yield by pinacol coupling reaction of aromatic aldehydes and ketones with commercially available zinc and AlCl3 · 6H2O in water. Copyright © Taylor & Francis Group, LLC.


Sarma A.,Pandu College | Sarma H.,Institute of Advanced Study in Science and Technology IASST | Sarma T.C.,Northeast Institute of Science and Technology | Handique A.K.,Gauhati University
Indian Journal of Natural Products and Resources | Year: 2011

Inflorescences of lemongrass [Cymbopogon flexuosus (Nees ex Steud.) Wats] accessions RLJ-TC-1, RLJ-TC-4, RLJ-TC- 9 and RLJ-TC-10 were freshly harvested at premature and mature stages. These were hydro-distilled for extraction of oil and compared with standard cultivar OD-19. Gas-chromatographic analysis of the oils from premature and mature inflorescences showed eight major constituents consisting of 90% of the oil. Citral (neral + geranial) was found to be the major constituent. Geranyl acetate was higher in the oil of pre-mature inflorescences and decreased on maturity, while citral content increased in the oil of mature inflorescences. Oil percentage was found higher in pre-mature inflorescence as compared to mature inflorescence and varied significantly (P=0.01). Major components (%) present in these oils were compared with OD-19, a standard cultivar and found to be at par.


Sarma A.,Pandu College | Sarma H.,North - Eastern Hill University | Sarma T.C.,Northeast Institute of Science and Technology | Handique A.K.,Gauhati University
Indian Journal of Biotechnology | Year: 2011

The aim of this study was to ascertain whether nitrate reductase (NR) and alkaline phosphatase activity (ALP) can be used as biochemical marker to screen lemon grass [Cymbopogon flexuosus (Steud) Wats] genotypes for higher herbage yield. In the study, 11 strains of essential oil bearing cash crop lemongrass were used. The results revealed that in vivo NR activity has significant positive correlation with herbage yield; however, no significant correlation was found for ALP. Thus, NR activity can be used as biochemical marker for screening lemon grass genotypes for growth and herbage yield.

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