Effect of phosphorus concentration of the nutrient solution on the volatile constituents of leaves and bracts of Origanum dictamnus
Economakis C, Skaltsa H, Demetzos C, Sokovic M, Thanos CA
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY

50 (22): 6276-6280 OCT 23 2002

Abstract:
The chemical composition of the essential oils obtained from the leaves and bracts of hydroponically cultivated Origanum dictamnus were analyzed by GC-MS techniques. Three different concentrations of phosphorus (5, 30, and 60 mg/L) in the nutrient solution were used for the cultivation, using the nutrient film technique (NFT). A total of 46 different compounds were identified and significant differences (qualitative and quantitative) were observed between the samples, Carvacrol and p-cymene were identified as the main compounds in all samples analyzed, whereas thymoquinone was found in higher percentage in the leaves than in bracts. The essential oils were tested for their antibacterial activity against Gram-positive and Gram-negative bacteria, The oils obtained from the bracts were found to be more active. The results obtained from GC-MS analyses were submitted to chemometric analysis.

Author Keywords:
Origanum dictamnus essential oils, hydroponic cultivation, antibacterial activity, GC-MS, chemometrics

KeyWords Plus:
PLANTS

Addresses:
Demetzos C, Univ Athens, Sch Pharm, Dept Pharmacognosy & Nat Prod Chem, GR-15771 Athens, Greece
Univ Athens, Sch Pharm, Dept Pharmacognosy & Nat Prod Chem, GR-15771 Athens, Greece
Natl Agr Res Fdn, Subtrop Plants & Olive Trees Inst, Iraklion, Greece

Publisher:
AMER CHEMICAL SOC, WASHINGTON

IDS Number:
605GE

ISSN:
0021-8561