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Showing papers on "Terpene published in 1984"


Journal ArticleDOI
TL;DR: In this article, the ability of yeast to biosynthesize terpenes and terpene derivatives was investigated in the course of studies about the influence of various yeast species and strains on the formation of fermentation byproducts.
Abstract: In the course of studies about the influence of various yeast species and strains on the formation of fermentation by-products, the ability of yeasts to biosynthesize terpenes and terpene derivatives was investigated. In model fermentations,Saccharomyces rosei, Kloeckera apiculata, Metschnikowia pulcherrima, andTorulopsis stellata formed trace amounts of the terpene hydrocarbonsβ-myrcene and limonene as well as the terpene alcohols linalool,α-terpineol, and farnesol. WithS. cerevisiae, only the formation of traces of farnesol could be established. These results clearly demonstrate that terpene patterns of various grape cultivars used in previous work for varietal classification of white wines are not influenced by yeast fermentation carried out according to modern enological methods.

39 citations


Journal ArticleDOI
TL;DR: A mixture of C-terpenes was prepared from conifer seedlings and introduced into fresh seawater samples taken near Seward, Alaska, indicating a high state of induction and the probable presence of terpenes.
Abstract: A mixture of 14C-terpenes was prepared from conifer seedlings and introduced into fresh seawater samples taken near Seward, Alaska. Initial rates of oxidation by the indigenous bacteria were linear and faster than the rates of toluene oxidation. Turnover times were 4 to 19 days. Autoradiographic measurements with 3H-terpenes indicated that at least 10% of the 0.6 × 109 to 2.7 × 109 bacteria per liter present could catabolize terpenes. The rate of terpene oxidation, 24 μg of terpenes per g of cells per h with 3 μg of terpenes added per liter, was a constant function of bacterial biomass. The specific affinity of the process was estimated to be between 8.1 and 81 liters/g of cells per h, indicating a high state of induction and the probable presence of terpenes. Terpene-oxidizing bacteria were grown on [14C]alanine and added to fresh seawater samples. Transfer of the bacterial radioactivity into larger particles at a rate of 146 pg/liter per h from the 2.3 × 109 organisms added indicated that any terpenes present would participate in the food chain.

27 citations


Journal ArticleDOI
TL;DR: Synthese a partir de la methoxymethyl-5 methyl-5 cyclohexane dione-1,3 via une tetrahydrobenzofurannone-4
Abstract: Synthese a partir de la methoxymethyl-5 methyl-5 cyclohexane dione-1,3 via une tetrahydrobenzofurannone-4

24 citations


Journal ArticleDOI
TL;DR: In this article, cell-free extracts from the callus of Jasminum officinale contained epoxidase activities with isopentyl pyrophosphate, ispeentenol, geraniol and nerol as substrates and also hydratase activities towards the resulting terpene oxides.

19 citations


Journal ArticleDOI
TL;DR: In this article, steam volatile oils were obtained from three cultivars of scuppernong berries at three levels of maturity and analyzed by capillary gas-liquid chromatography-mass spectrometry (GLC-MS).
Abstract: Steam volatile oils were obtained from three cultivars of scuppernong berries at three levels of maturity and analyzed by capillary gas-liquid chromatography-mass spectrometry (GLC-MS). Thirtyeight compounds consisting of aldehydes, substituted furans, ketones, alcohols, aromatic and aliphatic hydrocarbons, terpenes, and esters were identified. Major components from ripe berries were 2-pentanone, hexanal, toluene, furfural, 2-hexenal, xylene, benzylaldehyde, geraniol, β-phenylethanol formate, γ-terpinene, benzylalcohol, phenylethanol, linalool, isomer of nonadienal, β-ionone, and an unidentified pair of terpenes, m/e 152 and 154. Green berries had higher levels of 2-hexenal, hexanal, and toluene than ripe and midripe berries, and included other low retention-time compounds. Sugar levels of fruit increased with berry maturity, whereas acidity decreased.

13 citations


Book ChapterDOI
01 Jan 1984
TL;DR: Isoprenoids as discussed by the authors are constructed from isoprene (2-methyl-butadiene) units, and are used to synthesize terpenoids or terpenes.
Abstract: Isoprenoids (= terpenoids or terpenes) are constructed from isoprene (2-methyl-butadiene) units: Open image in new window

12 citations


Journal ArticleDOI
TL;DR: The ochtodane skeleton of 1,1-dimethyl-3-ethylcyclohexane (1) was constructed highly stereoselectively by the acid-catalyzed (SnCl4 or CF3CO2H) cyclization of the terminally functionalized myrcene derivatives.
Abstract: The ochtodane skeleton, the Carbon framework of 1,1-dimethyl-3-ethylcyclohexane (1) was constructed highly stereoselectively by the acid-catalyzed (SnCl4 or CF3CO2H) cyclization of the terminally functionalized myrcene derivatives, the benzenesulfenyl chloride adduct (7), the terminal β-hydroxy sulfide (8) derived from 7, and myrcene 6,7-epoxide (10). The stereoselectivity of the 3-exo-double bond in 1 formed concomitantly in the cyclization reaction was found to depend remarkably upon the reaction temperature and the 85–94% of E-stereoselectivity was attained at −78 °C. By the method, the ochtodane derivatives with the sulfur- or oxygen-functional groups on the C(6)-position were obtained. Synthetic applications of the ochtodane type compounds (12) and (19) to the aldehyde component (4) of the pheromone of the male boll weevils and to an ochtodane type terpene (26) isolated from the red alga Octodes crockeri, are reported.

9 citations


Journal ArticleDOI
TL;DR: On the basis of various metabolites isolated from the culture medium, together with the supporting evidence obtained from enzymatic and growth studies, it appears that P. incognita degrades alpha-terpineol by at least three different routes, and one of the pathways seems to operate via oleuropeic acid, while a second may be initiated through the aromatization of alpha- terpineol.
Abstract: Details of the metabolism of alpha-terpineol by Pseudomonas incognita are presented. Degradation of alpha-terpineol by this organism resulted in the formation of a number of acidic and neutral metabolites. Among the acidic metabolites, beta-isopropyl pimelic acid, 1-hydroxy-4-isopropenyl-cyclohexane-1-carboxylic acid, 8-hydroxycumic acid, oleuropeic acid, cumic acid, and p-isopropenyl benzoic acid have been identified. Neutral metabolites identified were limonene, p-cymene-8-ol, 2-hydroxycineole, and uroterpenol. Cell-free extracts prepared from alpha-terpineol adapted cells were shown to convert alpha-terpineol, p-cymene-8-ol, and limonene to oleuropeic acid, 8-hydroxycumic acid, and perillic acid, respectively, in the presence of NADH. The same cell-free extract contained NAD+ -specific dehydrogenase(s) which converted oleuropyl alcohol, p-cymene-7,8-diol, and perillyl alcohol to their corresponding 7-carboxy acids. On the basis of various metabolites isolated from the culture medium, together with the supporting evidence obtained from enzymatic and growth studies, it appears that P. incognita degrades alpha-terpineol by at least three different routes. While one of the pathways seems to operate via oleuropeic acid, a second may be initiated through the aromatization of alpha-terpineol. The third pathway may involve the formation of limonene from alpha-terpineol and its further metabolism.

6 citations


Patent
04 Jan 1984
TL;DR: For the purpose of dewaxing wax-embedded microtome slices, the solvent used is a terpene or a mixture of terpenes such as the terpes obtainable from orange peel, or limonene, terpinene and/or pinene.
Abstract: For the purpose of de-waxing wax-embedded microtome slices, the solvent used is a terpene or a mixture of terpenes such as the terpenes obtainable from orange peel, or limonene, terpinene and/or pinene.

3 citations


Patent
09 Feb 1984
TL;DR: In this paper, an unsaturated aldehyde flavoring agent is selected from the group consisting of cinnamic aldehydes and citral and about 0.1-5% of a terpene or sesquiterpene color stabilizer characterized by trisubstituted double bonds.
Abstract: Dentifrice formulations having improved stability against discoloration upon aging comprising an unsaturated aldehyde flavoring agent selected from the group consisting of cinnamic aldehyde and citral and about 0.1-5% of a terpene or sesquiterpene color stabilizer characterized by trisubstituted double bonds and preferably selected from the group consisting of limonene and essential oils rich in limonene such as citrus oils, ocimene, caryophyllene and clove sesquiterpenes, myrcene, terpene derivatives thereof such as citronellyl acetate, and mixtures thereof, in a dental vehicle free of oxidizing agents such as peracids and salts thereof and maintained at a pH below 8.5 and preferably acid to slightly alkaline (about 5-7.5).

3 citations


Book ChapterDOI
01 Jan 1984
TL;DR: Essential oils are mixtures of many substances, predominantly terpenes (ea. 90%) and phenylpropane derivatives (e.g., phenylpane derivatives), and include simple phenols, sulphurcontaining compounds (mustard oils), methyl anthranilate and coumarins as mentioned in this paper.
Abstract: Essential oils are mixtures of many substances, predominantly terpenes (ea. 90%) and phenylpropane derivatives. Other components include simple phenols, sulphurcontaining compounds (mustard oils), methyl anthranilate and coumarins.



DOI
01 Sep 1984
TL;DR: In this paper, Bakuchiol, a meroterpene isolated from the plantPsoralea corylifolia provides a good model for biosynthetic studies pertaining to some of the above points.
Abstract: Biosynthesis of terpenes present some special features. Incorporations of precursors are generally low. Degradation of substrates or higher terpenes into smaller units and their reutilisation into lower terpenes cause randomisation of the labels. Unbalanced distribution of the labels from labelled mevalonalactone (mva) into isopentenyl pyrophosphate and dimethylallyl pyrophosphate moieties and incorporation of amino acids into terpenes are some of the other special features of monoterpene biosynthesis. Bakuchiol, a meroterpene isolated from the plantPsoralea corylifolia provides a good model for biosynthetic studies pertaining to some of the above points. Using substrates labelled with suitable isotopes, it has been established that bakuchiol is biosynthesised from one phenylpropane and twomva units. Incorporation of leucine into bakuchiol has also been observed. Degradation of biosynthesised bakuchiol indicated extensive randomisation of the labels, thus its terpenic part is biosynthesised by the normal mevalonate pathway.