نتایج جستجو برای: r limonene

تعداد نتایج: 448500  

Journal: :Drug metabolism and disposition: the biological fate of chemicals 2002
Mitsuo Miyazawa Masaki Shindo Tsutomu Shimada

Limonene, a monocyclic monoterpene, is present in orange peel and other plants and has been shown to have chemopreventive activities. (+)- and (-)-Limonene enantiomers were incubated with human liver microsomes and the oxidative metabolites thus formed were analyzed using gas chromatography-mass spectrometry. Two kinds of metabolites, (+)- and (-)-trans-carveol (a product by 6-hydroxylation) an...

Journal: :Biological & pharmaceutical bulletin 2002
Takuro Maruyama Daisuke Saeki Michiho Ito Gisho Honda

We cloned the gene of d-limonene synthase (ArLMS) from Agastache rugosa (Labiatae). The function of ArLMS was elucidated by the preparation of recombinant protein and subsequent enzyme assay. ArLMS consisted of 2077 nucleotides including 1839 bp of coding sequence that encodes a protein of 613 amino acids. This protein has a 60 kDa molecular weight, which is identical to that of d-limonene synt...

2002
CK Wilkins P Wolkoff PA Clausen M Hammer GD Nielsen

Earlier, we reported the formation of unidentified strong irritants in reaction mixtures of terpenes and ozone. The identified products included aldehydes, ketones and carboxylic acids. Here we report the effects of relative humidity and reaction time on irritant formation in our flow reaction system using limonene and isoprene. Upper airway irritation was measured in mice (via reduction of res...

2014
Beatriz Chueca Rafael Pagán Diego García-Gonzalo

(+)-limonene is a lipophilic antimicrobial compound, extracted from citrus fruits' essential oils, that is used as a flavouring agent and organic solvent by the food industry. A recent study has proposed a common and controversial mechanism of cell death for bactericidal antibiotics, in which hydroxyl radicals ultimately inactivated cells. Our objective was to determine whether the mechanism of...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2000
M Schalk R Croteau

The essential oils of peppermint and spearmint are distinguished by the position of oxygenation on the constituent p-menthane monoterpenes. Peppermint produces monoterpenes bearing an oxygen at C3, whereas spearmint produces monoterpenes bearing an oxygen at C6. Branching of the monoterpene biosynthetic pathways in these species is determined by two distinct cytochrome P450s that catalyze the r...

Journal: :Zeitschrift fur Naturforschung. C, Journal of biosciences 2004
Roderick J Weston

The Raukaua genus of the family Araliaceae consists of 3 species, R. anomalus, R. edgerleyi and R. simplex, all endemic to New Zealand. The essential oil of R. edgerleyi and R. simplex consisted largely of monoterpenes. Limonene was the most abundant (23%) in R. edgerleyi and myrcene the most abundant (34%) in R. simplex. The oil of R. simplex lacked any significant sesquiterpenoids whereas bic...

Journal: :Human & Experimental Toxicology 2013

2015
Sergey Tin Tamara Fanjul Matthew L Clarke

In the hydrogenation of sluggish unactivated enamine substrates, Rh complexes of electron-deficient phosphines are demonstrated to be far more reactive catalysts than those derived from triphenylphosphine. These operate at low catalyst loadings (down to 0.01 mol %) and are able to reduce tetrasubstituted enamines. The use of the sustainable and environmentally benign solvent (R)-limonene for th...

Journal: :Zeitschrift fur Naturforschung. C, Journal of biosciences 2001
G Zeneli C Tsitsimpikou P V Petrakis G Naxakis D Habili V Roussis

Terpene composition of needle and cortical oleoresin from lateral shoots were analyzed by GC/MS for four Silver fir (Abies alba Mill.) populations scattered in natural species range in Albania. More than sixty compounds were detected in the needle oleoresin, which was characterized by a high content of alpha-pinene, camphene, beta-pinene, limonene and bornyl acetate. Three monoterpenes, alpha-p...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2016
Xin Wang Wei Liu Changpeng Xin Yi Zheng Yanbing Cheng Su Sun Runze Li Xin-Guang Zhu Susie Y Dai Peter M Rentzepis Joshua S Yuan

Terpenes are the major secondary metabolites produced by plants, and have diverse industrial applications as pharmaceuticals, fragrance, solvents, and biofuels. Cyanobacteria are equipped with efficient carbon fixation mechanism, and are ideal cell factories to produce various fuel and chemical products. Past efforts to produce terpenes in photosynthetic organisms have gained only limited succe...

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