| | 1 | Author
| G. Boudourova-Krasteva3, Vassya Bankova3, J. M. Sforcinb, N. Nikolova3, S. Popov3 | Requires cookie* | | | Title
| Phenolics from Brazilian Propolis  | | | | Abstract
| The main phenolic constituents from Brazilian propolis, originating from Sao Paulo State, were isolated and identified: three flavonoids, a prenylated coumaric acid and two new benzopyranes, E and Z 2,2-dimethyl-6-carboxyethenyl-8-prenyl-2H-benzopyranes. | | | |
Reference
| Z. Naturforsch. 52c, 676—679 (1997); received April 7/June 9 1997 | | | |
Published
| 1997 | | | |
Keywords
| Propolis, Phenolics, Flavonoids, Benzopyranes | | | |
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| default:Reihe_C/52/ZNC-1997-52c-0676.pdf | | | | Identifier
| ZNC-1997-52c-0676 | | | | Volume
| 52 | |
| 2 | Author
| Tytti Kujala, Jyrki Loponen, Kalevi Pihlaja | Requires cookie* | | | Title
| Betalains and Phenolics in Red Beetroot (Beta vulgaris) Peel Extracts: Extraction and Characterisation | | | | Abstract
| The extraction of red beetroot (Beta vulgaris) peel betalains and phenolics was compared with two extraction methods and solvents. The content of total phenolics in the extracts was determined according to a modification of the Folin-Ciocalteu method and expressed as gallic acid equivalents (G A E). The profiles of extracts were analysed by high-performance liquid chromatography (HPLC). The compounds of beetroot peel extracted with 80% aqueous methanol were characterised from separated fractions using HPLC-diode array detection (H PL C -D A D) and HPLC-electrospray ionisation-mass spectrometry (H PLC-ESI-M S) tech niques. The extraction methods and the choice of solvent affected noticeably the content of individual compounds in the extract. The betalains found in beetroot peel extract were vulgaxanthin I, vulgaxanthin II, indicaxanthin, betanin, prebetanin, isobetanin and neobe-tanin. A lso cyclodopa glucoside, /V-formylcyclodopa glucoside, glucoside of dihydroxyindol-carboxylic acid, betalamic acid, L-tryptophan, p-coumaric acid, ferulic acid and traces o f un identified flavonoids were detected. | | | |
Reference
| Z. Naturforsch. 56c, 343 (2001); received January 9/February 12 2001 | | | |
Published
| 2001 | | | |
Keywords
| Beta vulgaris, Betalains, Phenolics | | | |
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| default:Reihe_C/56/ZNC-2001-56c-0343.pdf | | | | Identifier
| ZNC-2001-56c-0343 | | | | Volume
| 56 | |
| 4 | Author
| | Requires cookie* | | | Title
| A Novel Caffeic Acid Derivative and Other Constituents of Populus Bud Excretion and Propolis (Bee-Glue) | | | | Abstract
| E ck h a rd W ollenw eber, Y oshinori A sakaw a*, D etlef Schillo, U lrich L eh m an n , and H eid ru n W eigel The bud exudates of Populus nigra, P. trichocarpa, and P. grandidentata x tremuloides were analyzed for the presence of phenolics and flavonoids. A novel natural product, caffeic acid y.y-dimethylallyl ester, was identified from P. nigra, along with further phenolics such as /?-hydroxy-acetophenone, dimethyl caffeic acid, cinnamoyl cinnamata and vanillin. The flavonoid aglycones correspond to those reported earlier. Propolis samples from the Sonoran Desert were shown to exhibit the flavonoid pattern that is typical for poplar bud exudates, thus confirming this material as the major source for bee-glue. Only a single flavonoid might originate from the leaf exudate of a desert shrub. | | | |
Reference
| Z. Naturforsch. 42c, 1030—1034 (1987); received May 8/May 21 1987 | | | |
Published
| 1987 | | | |
Keywords
| Populus (Salicaceae), Bud Exudate, Propolis, Phenolics, Flavonoids | | | |
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| default:Reihe_C/42/ZNC-1987-42c-1030.pdf | | | | Identifier
| ZNC-1987-42c-1030 | | | | Volume
| 42 | |
| 6 | Author
| W. Greenaway, J. M. Ay, F. R. Whatley | Requires cookie* | | | Title
| | | | | Abstract
| Analysis by GC-MS identified 30 phenolic compo nents of the bud exudate of P. laurifolia. The majority of the exudate was composed of flavanones, flavanonols and chalcones, with pinobanksin-3-acetate being the major component. The bud exudate resembled that of the Asian Section Tacamahaca poplars P. cathayana and P. szechuanica but was unlike that of the North Ameri can Section Tacamahaca poplars, P. balsamifera and P. trichocarpa. | | | |
Reference
| Z. Naturforsch. 47c, 776—778 (1992); received May 19 1992 | | | |
Published
| 1992 | | | |
Keywords
| Populus laurifolia, Salicacae, Poplar, Bud Exudate, Phenolics | | | |
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| default:Reihe_C/47/ZNC-1992-47c-0776_n.pdf | | | | Identifier
| ZNC-1992-47c-0776_n | | | | Volume
| 47 | |
| 9 | Author
| Jochen Berlin, Edgar Forche, Victor Wray, Joachim Hammer, Wolfgang Hösel | Requires cookie* | | | Title
| Formation of Benzophenanthridine Alkaloids by Suspension Cultures o f Eschscholtzia californica | | | | Abstract
| Suspension cultures of Eschscholtzia californica accum ulate the dihydro forms o f the benzo phenanthridine alkaloids sanguinarine, chelirubine, macarpine and chelerythrine, all o f which are known to be constituents o f the Eschscholtzia plant. U nder most experimental conditions dihydrochelirubine was found to be the main constituent of the cultured cells. The specific yields of alkaloids varied from zero to 1.7% on a dry weight basis depending on the m edia conditions. The highest specific yield was 1.5 m g/g dry weight or 13 mg/1 with the growth m edium B5. After transfer of the cells into the induction medium IM2 the alkaloid accum ulation increased to 17 mg/g dry weight and 146 mg/1. The induction m edium contained increased levels o f sucrose, decreased levels of phosphate and was devoid of phytohormones. The effect o f the various m edia conditions on the biosynthesis of phenolics was quite different to those found for the alkaloids. | | | |
Reference
| Z. Naturforsch. 38c, 346 (1983); received February 7 1983 | | | |
Published
| 1983 | | | |
Keywords
| Eschscholtzia californica, Suspension Cultures, Benzophenanthridine Alkaloids, Phenolics, Media Effects | | | |
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| default:Reihe_C/38/ZNC-1983-38c-0346.pdf | | | | Identifier
| ZNC-1983-38c-0346 | | | | Volume
| 38 | |
| 11 | Author
| ChristineA. Kraus, Gerhard Spiteller | Requires cookie* | | | Title
| Phenolic Compounds from Ageing Shoots of Picea abies | | | | Abstract
| The influence of ageing on the amount and composition of phenolic compounds and their glucosides was studied in one to five-year-old shoots of Picea abies. The total content of phenolics increased remarkably within the first two years of growth. In this period cinnamic acid derivatives were dominating, but beginning with the end of the first vegetation period a dramatic increase of acetophenones was observed. Obviously at the end of the first vegetation period the cinnamic acid derivatives are subjected to oxidation resulting in an increase of acetophenones. | | | |
Reference
| Z. Naturforsch. 52c, 308 (1997); received Decem ber 19 1996/January 23 1997 | | | |
Published
| 1997 | | | |
Keywords
| Picea abies, Ageing, Phenolics, Phenolic Glucosides, Quantification by GC-MS | | | |
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| default:Reihe_C/52/ZNC-1997-52c-0308.pdf | | | | Identifier
| ZNC-1997-52c-0308 | | | | Volume
| 52 | |
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