| 1. |
- Ahmed, A. Ahmed, et al.
(författare)
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Eudesmane derivatives from Laggera crispata and Pluchea carolonesis
- 1998
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Ingår i: Phytochemistry. - : Elsevier. - 0031-9422 .- 1873-3700. ; 49:8, s. 2421-2424
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Tidskriftsartikel (refereegranskat)abstract
- Investigation of the aerial parts of Laggera crispata and Pluchea carolonesis afforded in addition to several known compounds, three new eudesmane derivatives, 3β,4α-dihydroxy-7-epi-eudesm-11(13)-ene, 3α-(2′,3′-dihydroxy-2′-methylbutanoyl)-4,11-dihydroxy-6,7-dehydroeudesman-8-one and 3α-(3′-chloro-2′-hydroxy-2′-methylbutanoyl)cuauhtemone. The structures were elucidated by spectroscopic methods
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| 2. |
- Andersson Dunstan, Christina, et al.
(författare)
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Alphitol, a phenolic substance from Alphitonia zizyphoides which inhibits prostaglandin biosynthesis in vitro
- 1998
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Ingår i: Phytochemistry. - 0031-9422 .- 1873-3700. ; 48:3, s. 495-497
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Tidskriftsartikel (refereegranskat)abstract
- The new phenolic compound, 3,5-dihydroxy-4-methoxy phenethyl alcohol, named alphitol, and betulinic acid were isolated from the bark of Alphitonia zizyphoides. The chemical structure of alphitol was determined by mass spectrometry in combination with one and two dimensional NMR, including HMBC. Both compounds inhibited prostaglandin biosynthesis in vitro, alphitol with an IC50 value of 0.66 mM, which is of the same magnitude as acetyl salicylic acid.
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| 3. |
- Borg Karlson, A. K., et al.
(författare)
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Floral fragrance chemistry in the early flowering shrub Daphne mezereum
- 1996
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Ingår i: Phytochemistry. - : Elsevier BV. - 0031-9422 .- 1873-3700. ; 41:6, s. 1477-1483
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Tidskriftsartikel (refereegranskat)abstract
- The floral fragrance of the shrub Daphne mezereum in central Sweden was collected by means of the head-space technique and investigated by GC-MS and multi-dimensional GC. (S)-(+)-Linalool was the main constituent (95%) of the flower fragrance and its enantiomeric purity exceeded 99% in the samples. The (2S, 5S)- and (2R, 5S)-furanoid and the (3R, 6S)- and (3S, 6S)-pyranoid linalool oxide isomers constituted 2-5% of the fragrance. The elution order of these compounds on a permethylated beta-cyclodextrin column is reported. A fragrance sample of D. mezereum as well as (S)-(+)-linalool attracted males of the vernal solitary bee species Colletes cunicalarius and Andrena cinerea. A racemic mixture of the two enantiomeric pairs of known furanoid linalool oxides was only weakly attractive to the bees. The role of the fragrance in the pollination specialization of the plant is discussed.
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| 4. |
- Borgkarlson, A. K., et al.
(författare)
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Dimethyl Oligosulphides, Major Volatiles Released from Sauromatum Guttatum and Phallus-Impudicus
- 1994
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Ingår i: Phytochemistry. - : Elsevier. - 0031-9422 .- 1873-3700. ; 35:2, s. 321-323
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Tidskriftsartikel (refereegranskat)abstract
- The odour released from the flower of the voodoo lily Sauromatum guttatum Araceae and the odour of the mushroom Phallus impudicus Phallaceae were analysed. The two species had the major constituents dimethyl disulphide and dimethyl trisulphide in common. Other major components of the S. guttatum excretion were beta caryophyllene, dimethyl sulphide, dimethyl tetrasulphide, indole and skatole. Linalool, trans-ocimene, and phenylacetaldehyde were released by P. impudicus.
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| 5. |
- Brodelius, Peter, et al.
(författare)
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A Procedure for the Determination of Optimal Chitosan Concentrations for Elicitation of Cultured Plant Cells.
- 1989
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Ingår i: Phytochemistry. - 0031-9422 .- 1873-3700. ; 28:10, s. 2651-2654
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Tidskriftsartikel (refereegranskat)abstract
- An experimental method for determination of the optimum chitosan concentration for elicitation of plant cell suspension cultures is presented. The procedure, which is based on measurements of the conductivity of the culture medium after addition of chitosan, has been applied to suspension cultures of Nicotiana tabacum and Eschscholtzia californica. Increased conductivity of the medium (due to permeabilization of the cells) results in decreased secondary product formation and cell growth. Maximum product formation is observed for cells elicited with the highest chitosan concentration which does not affect membrane permeability.
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| 6. |
- Broussalis, Adriana M., et al.
(författare)
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First cyclotide from Hybanthus (Violaceae)
- 2001
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Ingår i: Phytochemistry. - : Elsevier. - 0031-9422 .- 1873-3700. ; 58:1, s. 47-51
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Tidskriftsartikel (refereegranskat)abstract
- Hypa A, a novel macrocyclic polypeptide containing 30 amino acid residues, has been isolated from the n-butanol extract of the Argentine plant Hybanthus parviflorus. The sequence, cyclo-(SCVYIPCTITALLGCSCKNKVCYNGIPCAE), was determined by automated Edman degradation, quantitative amino acid analysis and nanospray MS/MS2. Three intramolecular disulfide bridges stabilize the cyclic peptide backbone of hypa A. Using these structural features to classify the peptide as a cyclotide, we extended the distribution of that substance class to a new genus, and now propose a uniform nomenclature for cyclotides.
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| 7. |
- Collinge, M A, et al.
(författare)
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Dynamics of Benzophenanthridine Alkaloid Production in Suspension Cultures of Eschscholtzia californica after Treatment with a Yeast Elicitor
- 1989
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Ingår i: Phytochemistry. - 0031-9422 .- 1873-3700. ; 28:4, s. 1101-1104
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Tidskriftsartikel (refereegranskat)abstract
- A number of benzophenanthridine alkaloids are induced in suspension cultures of Eschscholtzia californica after treatment with an elicitor prepared from yeast extract. The formation of the alkaloids sanguinarine, chelerythrine and macarpine has been studied in relation to; elicitor concentration, incubation time after elicitation, and culture age. A significant portion of these alkaloids is released into the medium. Sanguinarine and chelerythrine reach maximum levels a few hours after the time of elicitation. Thereafter, their levels decline and the amount of macarpine increases. Viability of elicited cells, as determined by their subsequent growth, is not significantly reduced. There is a good correlation between induced tyrosine decarboxylase activity and alkaloid formation.
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| 8. |
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| 9. |
- Funk, C, et al.
(författare)
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Increased Secondary Product Formation in Plant Cell Suspension Cultures after Treatment with a Yeast Carbohydrate (Elicitor)
- 1987
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Ingår i: Phytochemistry. - 0031-9422 .- 1873-3700. ; 26, s. 401-405
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Tidskriftsartikel (refereegranskat)abstract
- A carbohydrate fraction isolated from yeast extract by ethanolic precipitation was used as an elicitor to induce secondary product formation in plant cell suspension cultures. The elicitor preparation is effective in inducing glyceollin isomer synthesis (up to 200 μg glyceollin per g dry wt) in cells of Glycine max and enhancing berberine biosynthesis (up to four-fold) in cells of Thalictrum rugosum. The response of the cell cultures to the elicitor treatment is dependent on the amount of carbohydrate per unit of biomass and on the physiological state of the cells. Cells are optimally induced in late exponential or early stationary growth phases.
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| 10. |
- Funk, C, et al.
(författare)
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Influence of Growth Regulators and an Elicitor on Phenylpropanoid Metabolism in Suspension Cultures of Vanilla planifolia
- 1990
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Ingår i: Phytochemistry. - 0031-9422 .- 1873-3700. ; 29:3, s. 845-848
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Tidskriftsartikel (refereegranskat)abstract
- A cell suspension culture of Vanilla planifolia has been established in MS-medium. 2,4-D suppressed while NAA enhanced the formation of extractable phenolics. Cytokinins appeared to favour lignin biosynthesis. Treatment of the culture with chitosan resulted in the induction of various enzymes of phenylpropanoid metabolism, while the amount of extractable phenolics decreased due to their rapid incorporation into polymeric ligneous material.
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