title: Comparative study of chemical composition and antioxidant activity of fresh and dry rhizomes of turmeric (Curcuma longa Linn.).
abstract: The phytoconstituents of essential oil and ethanol oleoresin of fresh and dry rhizomes of turmeric (Curcuma longa Linn.) were analyzed by GC-MS. The major constituents were aromatic-turmerone (24.4%), alpha-turmerone (20.5%) and beta-turmerone (11.1%) in fresh rhizome and aromatic-turmerone (21.4%), alpha-santalene (7.2%) and aromatic-curcumene (6.6%) in dry rhizome oil. Whereas, in oleoresins, the major components were alpha-turmerone (53.4%), beta-turmerone (18.1%) and aromatic-turmerone (6.2%) in fresh and aromatic-turmerone (9.6%), alpha-santalene (7.8%) and alpha-turmerone (6.5%) in dry rhizome. Results showed that alpha-turmerone, a major component in fresh rhizomes is only minor one in dry rhizomes. Also, the content of beta-turmerone in dry rhizomes is less than a half amount found in fresh rhizomes. The antioxidant properties have been assessed by various lipid peroxidation assays as well as DPPH radical scavenging and metal chelating methods. The essential oil and ethanol oleoresin of fresh rhizomes have higher antioxidant properties as compared dry ones.
authors.affiliation: Department of Chemistry, DDU Gorakhpur University, Gorakhpur-273009, India. gsingh4us@yahoo.com
authors.forename: G
authors.initials: G
authors.lastname: Singh
authors.forename: I P S
authors.initials: IP
authors.lastname: Kapoor
authors.forename: Pratibha
authors.initials: P
authors.lastname: Singh
authors.forename: Carola S
authors.initials: CS
authors.lastname: de Heluani
authors.forename: Marina P
authors.initials: MP
authors.lastname: de Lampasona
authors.forename: Cesar A N
authors.initials: CA
authors.lastname: Catalan
mesh_terms: D000975:Antioxidants / Q000737:chemistry* / Q000494:pharmacology*; D001713:Biphenyl Compounds / Q000737:chemistry / Q000378:metabolism; D002614:Chelating Agents / Q000737:chemistry / Q000378:metabolism; D030024:Curcuma / Q000737:chemistry*; D005296:Ferrous Compounds / Q000737:chemistry / Q000378:metabolism; D016166:Free Radical Scavengers / Q000737:chemistry; D008401:Gas Chromatography-Mass Spectrometry; D015227:Lipid Peroxidation / Q000187:drug effects; D010851:Picrates / Q000737:chemistry / Q000378:metabolism; D010936:Plant Extracts / Q000737:chemistry* / Q000494:pharmacology*; D027343:Rhizome / Q000737:chemistry; D013678:Technology, Pharmaceutical / Q000379:methods*
chemical_list: D000975:Antioxidants; D001713:Biphenyl Compounds; D002614:Chelating Agents; D005296:Ferrous Compounds; D016166:Free Radical Scavengers; D010851:Picrates; D010936:Plant Extracts; C004931:1,1-diphenyl-2-picrylhydrazyl