TY - JOUR A1 - Letzel, Matthias C. A1 - Synstad, Bjoenar A1 - Eijsink, Vincent G. H. A1 - Peter-Katalinic, Jasna A1 - Peter, Martin G. T1 - Libraries of chito-oligosaccharides of mixed acetylation patterns and their interactions with chitinases Y1 - 1999 SN - 3-9806494-5-8 ER - TY - JOUR A1 - Struszczyk, Marcin Henryk A1 - Loth, Fritz A1 - Peter, Martin G. T1 - Preparation of paper sheets containing microcrystalline chitosan Y1 - 1999 SN - 3-9806494-5-8 ER - TY - JOUR A1 - Struszczyk, Marcin Henryk A1 - Loth, Fritz A1 - Peter, Martin G. T1 - Method of microcrystalline chitosan-protein films preparation Y1 - 1999 ER - TY - JOUR A1 - Kaatz, Helvi A1 - Streffer, Katrin A1 - Wollenberger, Ursula A1 - Peter, Martin G. T1 - Inhibition of mushroom tyrosinase by kojic acid octanoates Y1 - 1999 ER - TY - JOUR A1 - Kamlage, Stefan A1 - Sefkow, Michael A1 - Peter, Martin G. T1 - Cross coupling of benzylic bromides and vinyl stannanes Y1 - 1999 ER - TY - JOUR A1 - Rottmann, Antje A1 - Synstad, Bjoenar A1 - Thiele, G. A1 - Schanzenbach, Dirk A1 - Eijsink, Vincent G. H. A1 - Peter, Martin G. T1 - Approaches towards the design of new chitinase inhibitors Y1 - 1999 SN - 3-9806494-5-8 ER - TY - JOUR A1 - Berth, Gisela A1 - Dautzenberg, Herbert A1 - Peter, Martin G. T1 - Physica-chemical characterization of chitosans in dilute solution Y1 - 1998 SN - 2-907922-57-2 ER - TY - JOUR A1 - Yenesew, Abiy A1 - Midiwo, Jacob O. A1 - Meisner, M. A1 - Heydenreich, Matthias A1 - Peter, Martin G. T1 - Two prenylated flavanones from stem bark of erythrina burttii Y1 - 1998 ER - TY - JOUR A1 - Yenesew, Abiy A1 - Midiwo, Jacob O. A1 - Heydenreich, Matthias A1 - Peter, Martin G. T1 - Four isoflavanones from stem bark of erythrina sacleuxii Y1 - 1998 ER - TY - JOUR A1 - Berth, Gisela A1 - Dautzenberg, Herbert A1 - Peter, Martin G. T1 - Physico-chemical characterization of chitosans varying in degree of acetylation Y1 - 1998 SN - 0144-8617 ER - TY - JOUR A1 - Struszczyk, Marcin Henryk A1 - Loth, Fritz A1 - Köhler, L. A. A1 - Peter, Martin G. T1 - Characterization of chitosan Y1 - 1998 ER - TY - JOUR A1 - Struszczyk, Marcin Henryk A1 - Loth, Fritz A1 - Peter, Martin G. T1 - Analysis of deacetylation deree in chitosans from various sources Y1 - 1998 ER - TY - JOUR A1 - Struszczyk, Marcin Henryk A1 - Loth, Fritz A1 - Peter, Martin G. T1 - Calibration of methods for the determination of the degree of decatetylation of chitosan Y1 - 1998 ER - TY - JOUR A1 - Streffer, Katrin A1 - Kaatz, Helvi A1 - Bauer, Christian G. A1 - Makower, Alexander A1 - Schulmeister, Thomas A1 - Scheller, Frieder W. A1 - Peter, Martin G. A1 - Wollenberger, Ursula T1 - Application of a sensitive catechol detector for determination of tyrosinase inhibitors Y1 - 1998 ER - TY - JOUR A1 - Alarcon, Julio A1 - Alderete, Joel B. A1 - Peter, Martin G. A1 - Becerra, Juan J. A1 - Silva, M. T1 - Study on synthesis of 3 alpha,4 alpha-dihydroxy-dihydro-beta-agarofuran Y1 - 1998 ER - TY - JOUR A1 - Peter, Martin G. A1 - Wollenberger, Ursula T1 - Phenol-oxidizing enzymes : mechanisms and applications Y1 - 1997 ER - TY - JOUR A1 - Haebel, Sophie A1 - Peter-Katalinic, Jasna A1 - Peter, Martin G. T1 - Mass spectrometry of chitooligosaccharides Y1 - 1997 SN - 88-86889- 01-1 ER - TY - JOUR A1 - Peter, Martin G. A1 - Miessner, Merle T1 - Primärstoffwechsel, Shikimat- und Phenylpropan-Gruppe, Vitamine, Coenzyme, Pflanzeninhaltsstoffe Y1 - 1997 ER - TY - JOUR A1 - Ratajska, M. A1 - Struszczyk, Marcin Henryk A1 - Boryniec, Stefan A1 - Peter, Martin G. A1 - Loth, Fritz T1 - The degree of acetylation of chitosan : optimization of the IR Method Y1 - 1997 ER - TY - JOUR A1 - Ley, J. P. A1 - Schweikart, F. A1 - Peter, Martin G. T1 - Chitinase inhibitors Y1 - 1997 ER - TY - JOUR A1 - Struszczyk, Marcin Henryk A1 - Ratajska, M. A1 - Boryniec, Stefan A1 - Peter, Martin G. A1 - Loth, Fritz T1 - The determination of the degree of N-acetylation of chitosan Y1 - 1997 ER - TY - JOUR A1 - Schanzenbach, Dirk A1 - Matern, Christa-Maria A1 - Peter, Martin G. T1 - Cleavage of chitin by means of sulfurice acid/acetc anhydride and isolation of peracetylated chito- oligosaccharides Y1 - 1997 ER - TY - JOUR A1 - Schanzenbach, Dirk A1 - Peter, Martin G. T1 - NMR spectroscopy of chito-oligosaccharides Y1 - 1997 ER - TY - JOUR A1 - Schanzenbach, Dirk A1 - Matern, Christa-Maria A1 - Peter, Martin G. T1 - Synthesis of glycosylamines and glycopeptides Y1 - 1997 ER - TY - JOUR A1 - Schanzenbach, Dirk A1 - Peter, Martin G. T1 - Chromatography of chito-oligosaccarides Y1 - 1997 ER - TY - JOUR A1 - Buss, U. A1 - Varum, K. M. A1 - Peter, Martin G. A1 - Spindler-Barth, Margarethe T1 - ELISA for quantitation of chitin, chitosan and related compounds Y1 - 1996 ER - TY - JOUR A1 - Andersen, S. O. A1 - Peter, Martin G. A1 - Roepstorff, Peter T1 - Cuticular sclerotization in insects Y1 - 1996 ER - TY - JOUR A1 - Krösche, Ch. A1 - Peter, Martin G. T1 - Detection of melanochromes by MALDI-TOF mass spectrometry Y1 - 1996 ER - TY - JOUR A1 - Ley, J. P. A1 - Peter, Martin G. T1 - Synthesis of L-histidine and (-)-spinacine chitooligosyl amides Y1 - 1996 ER - TY - JOUR A1 - Londershausen, M. A1 - Turberg, Andreas A1 - Bieseler, Barbara A1 - Lennarz, M. A1 - Peter, Martin G. T1 - Characterization and Inhibitor Studies of Chitinases from Parasitic Blowfly (Lucilia cuprina), Tick (Boophilus micoplus), Intestinale Nematode (Haemonchus contortus), and a Bean (Phaseolus vulgaris) Y1 - 1996 ER - TY - JOUR A1 - Londershausen, M. A1 - Turberg, Andreas A1 - Spindler-Barth, Margarethe A1 - Peter, Martin G. T1 - Screening Test for Insecticides Interfering with Cuticular Sclerotization Y1 - 1996 ER - TY - JOUR A1 - Peter, Martin G. T1 - Applications and environmental aspects of chitin and chitosan Y1 - 1995 SN - 0022-233X ER - TY - JOUR A1 - Schumacher-Wandersleb, Michael H. M. G. A1 - Peter, Martin G. T1 - Synthesis of chitobiosyl pyrrolidines Y1 - 1995 ER - TY - JOUR A1 - Abegaz, Berhanu M. A1 - Peter, Martin G. T1 - Emodine and emodinanthrone rhamnoside acetates from fruits of rhamnus prinoides Y1 - 1995 SN - 0031-9422 ER - TY - JOUR A1 - Peter, Martin G. T1 - The Bio-organic chemistry of melanogenesis Y1 - 1995 ER - TY - JOUR A1 - Peter, Martin G. T1 - Chemie i Biochemia Zewnetrznego Szkieletu Owadow : (Chemistry and biochemistry of the insect exoskeleton) Y1 - 1995 ER - TY - JOUR A1 - Peter, Martin G. T1 - Chemistry and biochemistry of the insect exoskeleton Y1 - 1995 ER - TY - JOUR A1 - Peter, Martin G. T1 - Chitin in den Startlöchern Y1 - 1995 SN - 0009-2959 ER - TY - JOUR A1 - Peter, Martin G. A1 - Merz, A. T1 - Stereoselective benzylic deprotonation in the enzymatic rearrangement of N-acetyldopamine derived o-Quinone to the p-Quinone methide Y1 - 1995 SN - 0957-4166 ER - TY - JOUR A1 - Ley, J. P. A1 - Peter, Martin G. T1 - Synthesis of N-(2-Acetamido-2-deoxy-ß-D-glucopyranosyl)- and of N-(N,N-Diacetylchitobiosyl)-amide of lhistidine Y1 - 1994 SN - 0039-7881 ER - TY - JOUR A1 - Peter, Martin G. A1 - Andersen, S. O. T1 - The molecular architecture of the insect exoskeleton Y1 - 1994 ER - TY - JOUR A1 - Schumacher-Wandersleb, Michael H. M. G. A1 - Petersen, Stefan A1 - Peter, Martin G. T1 - Preparation of the N-Acetylglucosaminidase inhibitor 1-Acetamido-1,2,5-tride oxy-2,5-imino-D-glucitol from methyl a-D-Mannopyranoside Y1 - 1994 ER - TY - JOUR A1 - Peter, Martin G. A1 - Ley, J. P. A1 - Petersen, Stefan A1 - Londershausen, M. A1 - Schumacher-Wandersleb, Michael H. M. G. A1 - Spindler, Klaus-Dieter A1 - Spindler-Barth, Margarethe A1 - Turberg, Andreas T1 - Synthesis of chitinase inhibitors Y1 - 1994 ER - TY - JOUR A1 - Krösche, Christian A1 - Crescenzi, Orlando A1 - Hoffbauer, Wilfried A1 - Jansen, Martin A1 - Napolitano, Alessandra A1 - Prota, Guiseppe A1 - Peter, Martin G. T1 - Synthesis of dopamines labelled with 13C in the alpha- or beta-side chain positions, and their application for structure studies on melanins by solid state NMR spectroscopy Y1 - 1994 ER - TY - GEN A1 - Peter, Martin G. A1 - Andersen, Svend Olav A1 - Hartmann, Rudolf A1 - Miessner, Merle A1 - Roepstorff, Peter T1 - Catecholamine-protein conjugates : isolation of 4-phenylphenoxazin-2-ones from oxidative coupling of N-acetyldopamine with alipathic amino acids N2 - 4-Phenylphenoxazinones were isolated after biomimetic oxidation, using diphenoloxidases of insect cuticle, mushroom tyrosinase, or after autoxidation of N-acetyldopamine (Image ) in the presence of β-alanine, β-alanine methyl ester or N-acetyl-L-lysine. They are formed presumably by addition of 2-aminoalkyl-5-alkylphenols to the o-quinone of biphenyltetrol which, in turn, arises from oxidative coupling of. The structures of present the first examples for the assembly of reasonably stable intermediates in the rather complex process of chemical modifications of aliphatic amino acid residues by o-quinones. T3 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - paper 062 Y1 - 1992 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-17571 ER - TY - GEN A1 - Andersen, Svend Olav A1 - Perter, Martin G. A1 - Roepstorff, Peter T1 - Cuticle-catalyzed coupling between N-acetylhistidine and N-acetyldopamine N2 - Several types of insect cuticle contain enzymes catalyzing the formation ofof adducts between N-acetyldopamine (NADA) and N-acetylhistidine (NAH). Two such adducts, NAH-NADA-I and NAH NADA-II, have been isolated and their structures determined. In one of the adducts the link connecting the two residues occurs between the I-position (ß-position) in the NADA side chain and the 1-N atom (τ-N) in the imidazole ring of histidine. Diphenoloxidase activity alone is not sufficient for formation of this adduct, whereas extracts containing both diphenoloxidase and o-quinone-p-quinone methide isomerase activities catalyze the coupling reaction. The adduct consists of a mixture of two diastereomers and they are presumably formed by spontaneous reaction between enzymatically produced NADA-p-quinone methide and N-acetylhistidine. The other adduct has been identified as a ring addition product of N-acetylhistidine and NADA. In contrast to the former adduct it can be formed by incubation of the two substrates with mushroom tyrosinase alone. An adduct between N-acetylhistidine and the benzodioxan-type NADA-dimer is produced in vitro, when the N-acetylhistidine-NADA adduct is incubated with NADA and locust cuticle containing a 1,2-dehydro-NADA generating enzyme system. Trimeric NADA-polymerization products of the substituted benzodioxan-type have been obtained from in vivo sclerotized locust cuticle, confirming the ability of cuticle to produce NADA-oligomers. The results indicate that some insect cuticles contain enzymes promoting linkage of oxidized NADA to histidine residues. It is suggested that histidine residues in the cuticular proteins can serve as acceptors for oxidized NADA and that further addition of NADA-residues to the phenolic groups of bound NADA can occur, resulting in formation of protein-linked NADA-oligomers. The coupling reactions identified may be an important step in natural cuticular sclerotization. T3 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - paper 072 KW - sclerotization KW - quinone KW - quinone methide KW - o-quinone isomerase KW - Hyalophora cecropia KW - Locusta migratoria Y1 - 1992 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-16762 ER - TY - GEN A1 - Peter, Martin G. A1 - Boldt, Peter C. A1 - Niederstein, Yvonne A1 - Peter-Katalinić, Jasna T1 - Synthesen von Galactose-Cluster-haltigen Steroid-Derivaten N2 - The synthesis of galactose clusters that are linked to a steroid moiety by a peptide-like spacer unit is described. The galactose cluster is obtained by Koenigs-Knorr glycosylation of TRIS-Gly-Fmoc (2b) under Helferich conditions. Peptide and ester bonds are formed after activation of carboxylic acids as diphenylthiophene dioxide (TDO) esters. 6a is synthesized in a convergent way by coupling of (Ac4Gal)3-TRIS-Gly (3e) with cholesteryl TDO succinate (5b). Coupling of (Ac4Gal)3-TRIS-Gly hydrogen succinate (3f) with Gly-O-Chol (5d) by means of EEDQ yields 6d. Reaction of (Ac4Gal)3-TRIS-Gly-SUCC-O-TDO (3g) with 25-hydroxycholesterol leads in a linear sequence to the oxysterol derivative 6f. Selective cleavage of the acetyl groups from galactose units yields the known compound 6b and the new derivatives 6e and 6g. T3 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - paper 042 KW - Glycoconjugates KW - Galactosides KW - Steroid esters KW - Amphiphiles KW - Glycopeptides Y1 - 1990 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-16783 ER - TY - GEN A1 - Peter, Martin G. A1 - Förster, Hans T1 - On the structure of Eumelanins : identification of constitutional patterns by solid-state NMR spectroscopy N2 - Aus dem Inhalt: Melanins are complex polyphenolic polymers. They are usually formed in nature by enzyme-catalyzed oxidative polymerization of o-diphenols. The deep black eumelanins, derived from Dopa 1 or dopamine 3, are distinguished from the yellow to brown phaeomelanins obtained from Dopa in the presence of cysteine. Characteristic of eumelanins are the indole units, which are formed from catecholamines by intramolecular addition of the amino groups to the oxidatively generated o-quinones. [...] T3 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - paper 053 Y1 - 1989 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-17027 ER - TY - GEN A1 - Peter, Martin G. T1 - Chemische Modifikation von Biopolymeren durch Chinone und Chinonmethide N2 - Chinone und Vorstufen, die oxidativ in Chinone und/oder Chinonmethide umgewandelt werden können, sind in der Natur weit verbreitet. Als sekundäre Naturstoffe wirken sie häufig antibiotisch, cytotoxisch, aber auch pathogen, und eine Reihe von Pflanzen und Tieren benutzt chinoide Substanzen als Abwehrstoffe, oft mit spektakulärem Erfolg. Auf makromolekularer Ebene spielen Chinonmethide im Pflanzenreich eine Schlüsselrolle bei der Biosynthese von Lignin, während die Bildung von Melanoproteinen ein Beispiel für Reaktionen von o-Chinonen im Tierreich ist. Bei den Insekten dienen Chinone und Chinonmethide zur Bildung des lebensnotwendigen Exoskeletts. Die Reaktivität von Chinonen in biologischen Systemen hat auch für den Menschen unmittelbare Bedeutung in pharmazeutischer, toxikologischer und technologischer Hinsicht. Den Beispielen in diesem Aufsatz liegt ein gemeinsames Prinzip zugrunde, nämlich die chemische Modifikation von Biopolymeren durch Chinone und Chinonmethide. Wie sich besonders bei einer detaillierteren Betrachtung der Reaktionen zeigt, die zur Sklerotisierung der Insektencuticula führen, sind in den letzten Jahren wichtige neue Erkenntnisse hinzugekommen, die vor allem durch die modernen Methoden der Stofftrennung und der Festkörper-NMR-Spektroskopie ermöglicht worden sind. T3 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - paper 043 Y1 - 1989 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-16802 ER - TY - GEN A1 - Peter, Martin G. A1 - Förster, Hans T1 - Zur Struktur von Eumelaninen : Identifizierung von Konstitutionsmustern durch Festkörper-NMR-Spektroskopie T1 - On the Structure of Eumelanins : Identification of Constitutional Patterns by Solid-state NMR Spectroscopy N2 - Aus dem Inhalt: Melanine sind komplexe polyphenolische Polymere. In der Natur entstehen sie durch meist enzymkatalysierte oxidative Polymerisation von o-Diphenolen. Man unterscheidet die aus Dopa 1 oder Dopamin 3 hervorgehenden, tiefschwarzen Eumelanine von den aus Dopa in Gegenwart von Cystein entstehenden, gelben bis braunen Phaomelaninen. [...] T3 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - paper 054 Y1 - 1989 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-17038 ER -