K. -W. Glombitza

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Marine brown algae such as Ascophyllum nodosum and Fucus vesiculosus accumulate polyphenols composed of phloroglucinol units. These compounds are of ecological importance and, due to their antioxidative activity, of pharmacological value as well. In this study four methods for the quantitative determination of phlorotannins are compared: spectrophotometric(More)
Within a project focusing on the chemopreventive potential of algal phenols, two phloroglucinol derivatives, belonging to the class of fucophlorethols, and the known fucotriphlorethol A were obtained from the ethanolic extract of the brown alga Fucus vesiculosus L. The compounds trifucodiphlorethol A and trifucotriphlorethol A are composed of six and seven(More)
The degradation of tryptophan (Try) and some of its potential intermediates has been studied in nodule bacteria (Rhizobium leguminosarum Frank, ATCC 10324). In feeding experiments with washed suspensions the following degradation products of Try could be identified by thin-layer chromatography: indolyl-3-pyruvic acid (IBS); indolyl-3-acetic acid (IES);(More)
s of posters A SIMPLE METHOD FOR THE ISOLATION OF PLANT VOLATILES T.A. van Beek and H. van Bokhoven Volatiles play an important biological role in both the animal and plant kingdom. Usually the concentration in which these mediators occur in air are too low for direct measurements by today's analytical techniques. Therefore the compounds have to be(More)
1. The degradation of tryptophan (Try) and some of its potential intermediates has been studied in Endomycopsis vernalis. The following degradation products were identified in surface-cultures of Endomycopsis which had been fed with C-14-labeled d,l-Try for 12–24 hrs: β-(indolyl-3)-pyruvic acid (IBS); β-(indolyl-3-)lactic acid (IMS); α-(indolyl-3-)acetic(More)
Among the simple unsaturated carbonic acids, acrylic acid is a comparatively specific inhibitor forStaphylococcus aureus, Escherichia coli and other bacteria. Insignificant bactericidal action can only be observed at high concentrations and long incubation time of acrylic acid. In olderE. coli cells, acrylic acid inhibits respiration more strongly than(More)
2-(Indole-3)ethylacetate was detected in cultures of Hansenula anomala, and Torulopsis utilis (Candida utilis) incubated with indole-3-acetaldehyde and indole-3-ethanol. The substance was identified by thin layer chromatography, IR-, UV- and NMR-spectra and by comparison with authentic material. The optimal conditions for synthesis of the new indole(More)
Isolierung, Identifizierung und quantitative Bestimmung: Nach s~ulenchromatographischer Auftrennung der aus Harn mit ~ther/Alkohol extrahierten Steroidkonjugate an A1203 [8] wurde die Sulfatfraktion noch ein zweites Mal chromatographiert. Durch Papierchromatographie im System n-Butanol/2n w~13riger NH~-L6sung (1 : 1) konnte die vollst/indige Abtrennung yon(More)
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