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Pantnagar, India

Padalia R.C.,Research Center Pantnagar | Karki N.,Kumaun University | Sah A.N.,Kumaun University | Verma R.S.,Research Center Pantnagar
Journal of Essential Oil-Bearing Plants | Year: 2011

The leaf and seed essential oils of Coriandrum sativum L. (family: Apiaceae) grown in tarai region of Uttarakhand, India were analyzed and compared by capillary GC and GC-MS. The analysis led to the identification of 88 constituents forming 93.55 % to 98.90 % of the total oil compositions. The major components in seed essential oil were monoterpenoids (90.18 %) represented by 74.01 % of oxygenated and 16.17 % of monoterpene hydrocarbons. Linalool (55.42 %), geranial (6.33 %), myrcene (5.53 %), α-humulene (5.29 %) and 1,8-cineole (3.30 %) were the major constituents of seed oil. On the contrary, aliphatic compounds (90.20 %), mainly comprised of C 8-C 16 aldehydes and alcohols, predominate in leaf essential oil of C. sativum. The major constituents identified were (E)-2-decenal (18.02 %), decanal (14.36 %), dec-9-en-1-ol (11.66 %), (E)-2-dodecenal (8.72 %), n-tetradecanol (6.09 %), dodecanal (5.81%) and decanol (5.77 %). Comparison of the oil composition of seed and leaf oil showed sharp qualitative and quantitative variation in their essential oil constituents. © 2011, Har Krishan Bhalla & Sons.

Padalia R.C.,Research Center Pantnagar | Verma R.S.,Research Center Pantnagar | Sundaresan V.,Research Center Pantnagar
Records of Natural Products | Year: 2010

The volatile constituents of three most common aromatic exotic weeds viz. Lantana camara L., Eupatorium adenophorum Spreng and Ageratum conyzoides L. of the Uttarakhand, India were analyzed by GC and GC-MS. The essential oil of Lantana camara L. was dominated by sesquiterpenoids (70.8%) represented by sesquiterpene hydrocarbons (68.7%) with germacrene D (27.9%), germacrene B (16.3%), β-caryophyllene (9.6%), β-selinene (6.2%), α-humulene (5.8%) as major constituents. Other constituents in significant amount were sabinene (5.6%) and 1,8-cineole (4.8%). Amorphenes viz. amorph-4-en-7-ol (9.6%), 3-acetoxyamorpha-4,7(11)-dien-8-one (7.8%) and amorph-4,7(11)-dien-8-one (5.7%) were identified as the marker constituents of Eupatorium adenophorum Spreng along with p-cymene (16.6%), bornyl acetate (15.6%) and camphene (8.9%). On the contrary, the essential oil of Ageratum conyzoides L. was characterized by the presence of high percentages of ageratochromene (precocene II, 42.5%), β-caryophyllene (20.7%), demethoxyageratochromene (precocene I, 16.7%), β-humulene (6.6%) and p-cymene (3.3%). © 2010 Reproduction is free for scientific studies.

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