@article{AbegazPeter1995, author = {Abegaz, Berhanu M. and Peter, Martin G.}, title = {Emodine and emodinanthrone rhamnoside acetates from fruits of rhamnus prinoides}, issn = {0031-9422}, year = {1995}, language = {en} } @article{AlarconAldereteAguilaetal.2005, author = {Alarcon, Julio and Alderete, Joel B. and Aguila, Sergio and Peter, Martin G.}, title = {Regio and stereoselective hydroxylation of alpha-agarofuran by biotransformation of rhizopus nigricans}, year = {2005}, abstract = {A new synthesis of 9 alpha-hydroxy-alpha-agarofuran (6 alpha) is described, using a microbiological hydroxylation alpha-agarofuran (5) as the key reaction. The stereochemistry of the biohydroxylation was determined on the basis of a NOESY-experiment and GIAO calculations at the B3LYP/cc-pVDZ level. A strong gamma-effect was observed at C15 of the agarofuran ring which was correctly predicted by the GIAO-B3LYP calculations}, language = {en} } @article{AlarconAlderetePeteretal.1998, author = {Alarcon, Julio and Alderete, Joel B. and Peter, Martin G. and Becerra, Juan J. and Silva, M.}, title = {Study on synthesis of 3 alpha,4 alpha-dihydroxy-dihydro-beta-agarofuran}, year = {1998}, language = {en} } @article{AndayiYenesewDereseetal.2006, author = {Andayi, Andrew W. and Yenesew, Abiy and Derese, Solomon and Midiwo, Jacob O. and Gitu, Peter M. and Jondiko, Ogoche J. I. and Akala, Hoseah M. and Liyala, Pamela and Wangui, Julia and Waters, Norman C. and Heydenreich, Matthias and Peter, Martin G.}, title = {Antiplasmodial flavonoids from Erythrina sacleuxii}, issn = {0032-0943}, doi = {10.1055/s-2005-873200}, year = {2006}, abstract = {The acetone extracts of the root bark and stem bark of Erythrina sacleuxii showed antiplasmodial activities against the chloroquine-sensitive (D6) and chloroquine-resistant (W2) strains of Plasmodium falciparum. Chromatographic separation of the acetone extract of the root bark afforded a new isoflavone, 7-hydroxy-4 -methoxy-3'- prenylisoflavone (trivial name 5-deoxy-3' - prenylbiochanin A) along with known isoflavonoids as the antiplasmodial principles. Flavonoids and isoflavonoids isolated from the stem bark of E. sucleuxii were also tested and showed antiplasmodial activities. The structures were determined on the basis of spectroscopic evidence}, language = {en} } @article{AndersenPeterRoepstorff1996, author = {Andersen, S. O. and Peter, Martin G. and Roepstorff, Peter}, title = {Cuticular sclerotization in insects}, year = {1996}, language = {en} } @article{BahrkeEinarssonGislasonetal.2002, author = {Bahrke, Sven and Einarsson, Jon M. and Gislason, Johannes and Haebel, Sophie and Letzel, Matthias C. and Peter-Katalinic, Jasna and Peter, Martin G.}, title = {Sequence analysis of chitooligosaccharides by matrix-assisted laser desorption ionization postsource decay mass spectrometry}, year = {2002}, abstract = {Oligosaccharides composed of 2-acetamido-2-deoxy-D-glucopyranose (GlcNAc) and/or 2-amino-2-deoxy-D- glucopyranose (GlcN) were prepd. by chem. degrdn. of chitin or chitosan and sepd. by gel permeation chromatog. Oligosaccharides obtained after enzymic hydrolysis of chitosan [FA 0.19] with a fungal chitinase were derivatized by reductive amination with 2-aminoacridone and sequenced by matrix-assisted laser desorption ionization time-of-flight postsource decay (PSD) mass spectrometry (MS). The sequence of a trimer, D1A2, was established as D-A-A. The compn. of a hexamer D3A3 was .apprx.65\% D-A-D-D-A-A and 35\% D-D-A-D-A-A. The PSD MS of a nonamer D5A4-amac revealed four isobaric species D-X-Y-D-X-Y-D-A-A, where A is GlcNAc, D is GlcN, and X and Y (X ¹ Y) are mutually either D or A. This structure motif was also obsd. in a dodecamer D7A5 which was composed of eight isobaric sequences of the general formula (D-X-Y)3- D-A-A.}, language = {en} } @phdthesis{BahrkeEinarssonGislasonetal.2003, author = {Bahrke, Sven and Einarsson, Jon M. and Gislason, Johannes and Haebel, Sophie and Peter-Katalinic, Jasna and Peter, Martin G.}, title = {Characterization of chitooligosaccharides by mass spectrometry}, isbn = {82-47-15901-5}, year = {2003}, language = {en} } @article{BeckerPeterPoolZobel2000, author = {Becker, Thomas W. and Peter, Martin G. and Pool-Zobel, Beatrice L.}, title = {Cellular effects of lignans : modulation of growth, oxidative DNA damage and cell metabolism in human colon cancer cells}, year = {2000}, language = {en} } @article{BerthDautzenbergPeter1998, author = {Berth, Gisela and Dautzenberg, Herbert and Peter, Martin G.}, title = {Physica-chemical characterization of chitosans in dilute solution}, isbn = {2-907922-57-2}, year = {1998}, language = {en} } @article{BerthDautzenbergPeter1998, author = {Berth, Gisela and Dautzenberg, Herbert and Peter, Martin G.}, title = {Physico-chemical characterization of chitosans varying in degree of acetylation}, issn = {0144-8617}, year = {1998}, language = {en} } @article{BringmannMutanyattaComarMaksimenkaetal.2008, author = {Bringmann, Gerhard and Mutanyatta-Comar, Joan and Maksimenka, Katja and Wanjohi, John M. and Heydenreich, Matthias and Brun, Reto and M{\"u}ller, Werner E. G. and Peter, Martin G. and Midiwo, Jacob O. and Yenesew, Abiy}, title = {Joziknipholones A and B : the first dimeric phenylanthraquinones, from the roots of Bulbine frutescens}, issn = {0947-6539}, year = {2008}, abstract = {From the roots of the African plant Bulbine frutescens (Asphodelaceae), two unprecedented novel dimeric phenylanthraquinones, named joziknipholones A and B, possessing axial and centrochirality, were isolated, together with six known compounds. Structural elucidation of the new metabolites was achieved by spectroscopic and chiroptical methods, by reductive cleavage of the central bond between the monomeric phenylanthraquinone and -anthrone portions with sodium dithionite, and by quantum chemical CD calculations. Based on the recently revised absolute axial configuration of the parent phenylanthraquinones, knipholone and knipholone anthrone, the new dimers were attributed to possess the P- configuration (i.e., with the acetyl portions below the anthraquinone plane) at both axes in the case of joziknipholone A, whereas in joziknipholone B, the knipholone part was found to be M-configured. Joziknipholones A and B are active against the chloroquine resistant strain K1 of the malaria pathogen, Plasmodium falciparum, and show moderate activity against murine leukemic lymphoma L5178y cells.}, language = {en} } @article{BussVarumPeteretal.1996, author = {Buss, U. and Varum, K. M. and Peter, Martin G. and Spindler-Barth, Margarethe}, title = {ELISA for quantitation of chitin, chitosan and related compounds}, year = {1996}, language = {en} } @phdthesis{DereseYenesewMidiwoetal.2003, author = {Derese, Solomon and Yenesew, Abiy and Midiwo, Jacob O. and Heydenreich, Matthias and Peter, Martin G.}, title = {A new isoflavone from stem bark of Millettia dura}, issn = {1011-3924}, year = {2003}, language = {en} } @article{EijsinkSynstadGaseidnesetal.2003, author = {Eijsink, Vincent G. H. and Synstad, Bjoenar and Gaseidnes, Sigrid and Komander, David and Houston, Douglas R. and Peter, Martin G. and van Aalten, Daan M. F.}, title = {Structure and function of chitinolytic enzymes}, isbn = {82-471-5901-5}, year = {2003}, abstract = {The recent work on a variety of family 18 chitonolytic enzymes has yielded important data concerning the structure, substrate-binding, catalysis, inhibitor-binding and even dynamics. These data have been useful in helping to better understand the roles of various types of chitinases in chitin hydrolysis, to rationally engineer the properties of these enzymes, thus making them more suitable as biocatalysts, and to study and understand the effectiveness of natural and designed chitinase inhibitors, which may be of medical interest. On the other hand, the recent work on ChiB shows that catalysis in family 18 chitinases is a highly complicated process, involving larger parts of the enzyme and dynamics. Thus, despite recent discoveries, there is still a lot more to discover about how these enzyme work.}, language = {en} } @article{FasciottiSanvidoSantosetal.2012, author = {Fasciotti, Maira and Sanvido, Gustavo B. and Santos, Vanessa G. and Lalli, Priscila M. and McCullagh, Michael and de Sa, Gilberto F. and Daroda, Romeu J. and Peter, Martin G. and Eberlin, Marcos N.}, title = {Separation of isomeric disaccharides by traveling wave ion mobility mass spectrometry using CO2 as drift gas}, series = {Journal of mass spectrometr}, volume = {47}, journal = {Journal of mass spectrometr}, number = {12}, publisher = {Wiley-Blackwell}, address = {Hoboken}, issn = {1076-5174}, doi = {10.1002/jms.3089}, pages = {1643 -- 1647}, year = {2012}, abstract = {The use of CO2 as a massive and polarizable drift gas is shown to greatly improve peak-to-peak resolution (Rp-p), as compared with N2, for the separation of disaccharides in a Synapt G2 traveling wave ion mobility cell. Near or baseline Rp-p was achieved for three pairs of sodiated molecules of disaccharide isomers, that is, cellobiose and sucrose (Rp-p?=?0.76), maltose and sucrose (Rp-p?=?1.04), and maltose and lactose (Rp-p?=?0.74). Ion mobility mass spectrometry using CO2 as the drift gas offers therefore an attractive alternative for fast and efficient separation of isomeric disaccharides.}, language = {en} } @misc{FerenzPeter1987, author = {Ferenz, Hans-J{\"o}rg and Peter, Martin G.}, title = {The inhibitory effect of sinefungin on juvenile hormone biosynthesis and development in locusts}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-16811}, year = {1987}, abstract = {The antibiotic fungal metabolite sinefungin is a potent inhibitor of S-adenosylmethionine-acceptor methyltransferases. Its effect on insect metabolism and especially on corpora allata farnesoic acid methyltransferase, which catalyzes the penultimate step of juvenile hormone biosynthesis, was investigated in Locusta migratoria. Injection of sinefungin results in a delay of imaginal molt and in suppression of ovary development. Isolated corpora allata are unable to synthesize juvenile hormone III in the presence of more than 1.0 mM sinefungin. In a cell-free system containing the S-adenosylmethionine-dependent farnesoic acid methyltransferase from corpora allata sinefungin is a competitive inhibitor of the synthesis of methylfarnesoate with Ki of 1 μM.}, language = {en} } @misc{FerenzPeterBerg1983, author = {Ferenz, Hans-J{\"u}rgen and Peter, Martin G. and Berg, Dieter}, title = {Inhibition of farnesoic acid methyltransferase by sinefungin}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17016}, year = {1983}, abstract = {Sinefungin inhibited the S-adenosylmethionine-dependent farnesoic acid methyltransferase in a cell-free system containing a homogenate of corpora allata from female locusts, Locusta migratoria. The enzyme catalyzed the penultimate step of juvenile hormone biosynthesis in the insects. Culturing corpora allata in the presence of sinefungin greatly suppressed juvenile hormone production. The following in vivo effects were visible after injection of the inhibitor: increase in mortality and reduction of total haemolymph protein liter and ovary fresh weight, as well as length of terminal oocytes. Attempts to reverse these effects by topical application of the juvenile hormone analog ZR-515 (methoprene) were only partly successful. Therefore, the in vivo effects may be due to a general inhibition of methyltransferase enzymes in the insect. Sinefungin appeared to be of potential interest as the first representative of a new class of insect growth regulators.}, language = {en} } @article{FettkePeikowPeteretal.2009, author = {Fettke, Anja and Peikow, Dirk and Peter, Martin G. and Kleinpeter, Erich}, title = {Synthesis and conformational analysis of glycomimetic analogs of thiochitobiose}, issn = {0040-4020}, doi = {10.1016/j.tet.2009.03.067}, year = {2009}, abstract = {The synthesis of six analogs of N,N;-diacetylchitobiose is reported, including a novel transglycosylation reaction for the preparation of S-aryl thioglycosides. The conformations of the compounds were studied by a combination of NMR spectroscopy and molecular modeling, using force field calculations. In the case of the S-aryl thioglycosides with exclusively S-glycosidic linkages, dihedral angles of the disaccharidic S-glycosidic bonds, ;; and ;; and of the S-arylglycoside bonds, ; and ;, were found to be similar, whereas they were different in mixed glycosides and in a thiazoline derivative. An adequate correlation between the calculated H,H-distances of the local minima and the measured NOE contacts was achieved by applying population-weighted averages over participating conformers based on weighted relative energies.}, language = {en} } @article{FotieNkengfackPeteretal.2004, author = {Fotie, J. and Nkengfack, A. E. and Peter, Martin G. and Heydenreich, Matthias and Fomum, Z. T.}, title = {Chemical constituents of the ethyl acetate extracts of the stem bark and fruits of Dichrostachys cinerea and the roots of Parkia bicolor}, issn = {1011-3924}, year = {2004}, abstract = {The antibacterial activities of ethyl acetate, methanol and aqueous extracts of the stem bark of Dichrostachys cinerea and the roots of Parkia bicolor have been evaluated. Ethyl acetate extracts have been investigated, studies that led to a series of known compounds, amongst which many are reported here for the very first time from both the species}, language = {en} } @article{GermerKlodPeteretal.2002, author = {Germer, Antje and Klod, Sabrina and Peter, Martin G. and Kleinpeter, Erich}, title = {NMR spectroscopic and theoretical study of the complexation of the inhibitor allosamidin in the binding pocket of the plant chitinase hevamine}, year = {2002}, abstract = {Based on NMR spectroscopic information about the allosamidin-hevamine complex, ab initio MO calcns. of the ring current effect of the arom. moieties of Trp255, Tyr183 and Tyr6 of hevamine were carried out to investigate the role of these amino acid residues in binding interactions with allosamidin in soln. In addn., the intermol. steric compression effect on the 13C chem. shifts of the allosamizoline carbon atoms and the hydrogen bonding to Glu127 was identified. It can be inferred that the binding forces are strongest in the allosamizoline moiety of allosamidin.}, language = {en} } @article{GermerMuggePeteretal.2003, author = {Germer, Antje and Mugge, Clemens and Peter, Martin G. and Rottmann, Antje and Kleinpeter, Erich}, title = {Solution- and bound-state conformational study of N,N',N''-triacetyl chitotriose and other analogous potential inhibitors of hevamine: Application of trNOESY and STD NMR spectroscopy}, year = {2003}, abstract = {The soln.-state conformations of N,N',N''-triacetyl chitotriose (1) and other potential chitinase inhibitors 2-4 were studied using a combination of NMR spectroscopy (NOESY) and mol. mechanics calcns. Detn. solely of the global energy min. conformation was found to be insufficient for an agreement with the NMR results. An appropriate consistency between the NMR exptl. data and theor. calcns. was only reached by assessing the structures as population-weighted av. conformers based on Boltzmann distributions derived from the calcd. relative energies. Analogies, but also particular differences, between the synthetic compds. 2-4 and the naturally-occurring N,N',N''-triacetyl chitotriose were found. Furthermore, the conformation of compds. 1 and 2 when bound to hevamine was also studied using transferred NOESY expts. and the binding process was found to impart a level of conformational restriction on the ligands. The preferred conformation as detd. for 1 in the bound state to hevamine belonged to one of the conformational families found for the compd. when free in soln., although full characterization of the bound-state conformations was impeded due to severe signal overlap. Satn. transfer difference NMR expts. were also employed to analyze the binding epitopes of the bound compds. We thus detd. that it is mainly the acetyl amido groups of the trisaccharide and the heterocyclic moiety which are in close contact with hevamine.}, language = {en} } @article{GermerPeterKleinpeter2002, author = {Germer, Antje and Peter, Martin G. and Kleinpeter, Erich}, title = {Solution-state conformational study of the hevamine inhibitor allosamidin and six potential inhibitor analogues by NMR spectroscopy and molecular modeling}, year = {2002}, abstract = {The soln.-state conformations of the hevamine inhibitor allosamidin and six potential inhibitor analogs were studied by various NMR spectroscopic techniques and mol. modeling using force field calcns. Detn. solely of the global energy min. conformation was found to be insufficient for consensus with the NMR results, and agreement between the NMR exptl. data and the theor. calcns. was only reached by assessing the structures as population-weighted av. conformers on the basis of Boltzmann distributions derived from the calcd. relative energies. The conformations of the glycosidic linkages in the compds. were found to be similar when the sugar residues were the same, but differences were markedly evident otherwise and also for the various heterocyclic group linkages. The binding of the compds. to hevamine, which may also complex to chitinases in general, was assessed using HMQC, transfer-NOESY, and both 1-D and 2-D satn. transfer difference NMR expts. Under the conditions employed, only allosamidin was implicated to be bound to hevamine, and then only by HMQC with the dipolar coupling-based expts. failing to substantiate the formation of the complex. However, the results are consistent with the biochem. activities of the compds. whereby only allosamidin has been shown to act as a competitive inhibitor.}, language = {en} } @article{HaebelBahrkePeter2007, author = {Haebel, Sophie and Bahrke, Sven and Peter, Martin G.}, title = {Quantitative sequencing of complex mixtures of heterochitooligosaccharides by vMALDI-linear ion trap mass spectrometry}, issn = {0003-2700}, doi = {10.1021/Ac062254u}, year = {2007}, abstract = {Heterochitooligosaccharides possess interesting biol. properties. Isobaric mixts. of such linear heterochitooligosaccharides can be obtained by chem. or enzymic degrdn. of chitosan. However, the sepn. of such mixts. is a challenging anal. problem which is so far unresolved. It is shown that these isobaric mixts. can be sequenced and quantified simultaneously using std. derivatization and multistage tandem mass spectrometric techniques. A linear ion trap mass spectrometer equipped with a vacuum matrix-assisted laser desorption ionization (vMALDI) source is used to perform MS2 as well as MS3 expts. [on SciFinder (R)].}, language = {en} } @article{HaebelPeterKatalinicPeter1997, author = {Haebel, Sophie and Peter-Katalinic, Jasna and Peter, Martin G.}, title = {Mass spectrometry of chitooligosaccharides}, isbn = {88-86889- 01-1}, year = {1997}, language = {en} } @article{HoustonShiomiAraietal.2002, author = {Houston, Douglas R. and Shiomi, Kazuro and Arai, Noriko and Omura, Satoshi and Peter, Martin G. and Turberg, Andreas and Synstad, Bjoenar and Eijsink, Vincent G. H. and Van Aalten, Daan M. F.}, title = {High-resolution structures of a chitinase complexed with natural product cyclopentapeptide inhibitors : mimicry of carbohydrate substrate}, year = {2002}, abstract = {Over the past years, family 18 chitinases have been validated as potential targets for the design of drugs against human pathogens that contain or interact with chitin during their normal life cycles. Thus far, only one potent chitinase inhibitor has been described in detail, the pseudotrisaccharide allosamidin. Recently, however, two potent natural-product cyclopentapeptide chitinase inhibitors, argifin and argadin, were reported. Here, we describe high- resoln. crystal structures that reveal the details of the interactions of these cyclopeptides with a family 18 chitinase. The structures are examples of complexes of a carbohydrate-processing enzyme with high-affinity peptide-based inhibitors and show in detail how the peptide backbone and side chains mimic the interactions of the enzyme with chitooligosaccharides. Together with enzymol. characterization, the structures explain why argadin shows an order of magnitude stronger inhibition than allosamidin, whereas argifin shows weaker inhibition. The peptides bind to the chitinase in remarkably different ways, which may explain the differences in inhibition consts. The two complexes provide a basis for structure-based design of potent chitinase inhibitors, accessible by std. peptide chem.}, language = {en} } @article{IssareeVijayakrishnanAbdelnuretal.2009, author = {Issaree, Arisara and Vijayakrishnan, Balakumar and Abdelnur, Patricia V. and Corilo, Yuri E. and Riccio, Maria F. and Sanvido, Gustavo B. and Eberlin, Marcos N. and Peter, Martin G.}, title = {Mass spectrometry of aminoglucan oligosaccharides using electrospray ionization MS/MS and MS/MS/MS}, year = {2009}, language = {en} } @article{JumaAkalaEyaseetal.2011, author = {Juma, Wanyama P. and Akala, Hoseah M. and Eyase, Fredrick L. and Muiva, Lois M. and Heydenreich, Matthias and Okalebo, Faith A. and Gitu, Peter M. and Peter, Martin G. and Walsh, Douglas S. and Imbuga, Mabel and Yenesew, Abiy}, title = {Terpurinflavone an antiplasmodial flavone from the stem of Tephrosia Purpurea}, series = {Phytochemistry letters}, volume = {4}, journal = {Phytochemistry letters}, number = {2}, publisher = {Elsevier}, address = {Amsterdam}, issn = {1874-3900}, doi = {10.1016/j.phytol.2011.02.010}, pages = {176 -- 178}, year = {2011}, abstract = {The stem extract of Tephrosia purpurea showed antiplasmodial activity against the D6 (chloroquine-sensitive) and W2 (chloroquine-resistant) strains of Plasmodium falciparum with IC(50) values of 10.47 +/- 2.22 mu g/ml and 12.06 +/- 2.54 mu g/ml, respectively. A new prenylated flavone, named terpurinflavone, along with the known compounds lanceolatin A, (-)-semiglabrin and lanceolatin B have been isolated from this extract. The new compound, terpurinflavone, showed the highest antiplasmodial activity with IC(50) values of 3.12 +/- 0.28 mu M (D6) and 6.26 +/- 2.66 mu M (W2). The structures were determined on the basis of spectroscopic evidence.}, language = {en} } @article{KaatzStrefferWollenbergeretal.1999, author = {Kaatz, Helvi and Streffer, Katrin and Wollenberger, Ursula and Peter, Martin G.}, title = {Inhibition of mushroom tyrosinase by kojic acid octanoates}, year = {1999}, language = {en} } @article{KamlageSefkowPeter2001, author = {Kamlage, Stefan and Sefkow, Michael and Peter, Martin G.}, title = {A short synthesis of biologically active lignan analogues}, year = {2001}, abstract = {beta-Benzyl-gamma-butyrolactones were synthesized in four transition metal catalysed reactions from butynediol, and alkylated to afford new, biologically active lignan analogues.}, language = {en} } @article{KamlageSefkowPeter1999, author = {Kamlage, Stefan and Sefkow, Michael and Peter, Martin G.}, title = {Cross coupling of benzylic bromides and vinyl stannanes}, year = {1999}, language = {en} } @article{KamlageSefkowZimmermannetal.2002, author = {Kamlage, Stefan and Sefkow, Michael and Zimmermann, Nicole and Peter, Martin G.}, title = {Concise synthesis of (+)-beta-benzyl gamma-butyrolactones from butynediol}, year = {2002}, language = {en} } @misc{KortPeterKoopmanschap1983, author = {Kort, C. A. D. de and Peter, Martin G. and Koopmanschap, A. B.}, title = {Binding and degradation of juvenile hormone III by haemolymph proteins of the Colorado potato beetle: a re-examination}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-16777}, year = {1983}, abstract = {The haemolymph of the adult Colorado potato beetle, Lepinotarsa decemlineata Say, contains a high molecular weight (MW > 200,000) JH-III specific binding protein. The Kd value of the protein for racemic JH-III is 1.3 ± 0.2 × 10-7 M. It has a lower affinity for racemic JH-I and it does not bind JH-III-diol or JH-III-acid. The binding protein does discriminate between the enantiomers of synthetic, racemic JH-III as was determined by stereochemical anaysis of the bound and the free JH-III. Incubation of racemic JH-III with crude haemolymph results in preferential formation of (10S)-JH-III-acid, the unnatural configuration. The JH-esterase present in L. decemlineata haemolymph is not enantioselective. It is concluded that the most important function of the binding protein is that of a specific carrier, protecting the natural hormone against degradation by esterases. The carrier does not protect JH-I as efficiently as the lower homologue.}, language = {en} } @article{KroeschePeter1996, author = {Kr{\"o}sche, Ch. and Peter, Martin G.}, title = {Detection of melanochromes by MALDI-TOF mass spectrometry}, year = {1996}, language = {en} } @article{KroescheCrescenziHoffbaueretal.1994, author = {Kr{\"o}sche, Christian and Crescenzi, Orlando and Hoffbauer, Wilfried and Jansen, Martin and Napolitano, Alessandra and Prota, Guiseppe and Peter, Martin G.}, title = {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}, year = {1994}, language = {en} } @article{LetzelPeterKatalinicPeter2001, author = {Letzel, Matthias C. and Peter-Katalinic, Jasna and Peter, Martin G.}, title = {Mass spectrometry of chitin and chitosan oligosaccharides}, year = {2001}, language = {en} } @article{LetzelSynstadEijsinketal.1999, author = {Letzel, Matthias C. and Synstad, Bjoenar and Eijsink, Vincent G. H. and Peter-Katalinic, Jasna and Peter, Martin G.}, title = {Libraries of chito-oligosaccharides of mixed acetylation patterns and their interactions with chitinases}, isbn = {3-9806494-5-8}, year = {1999}, language = {en} } @article{LeyPeter1996, author = {Ley, J. P. and Peter, Martin G.}, title = {Synthesis of L-histidine and (-)-spinacine chitooligosyl amides}, year = {1996}, language = {en} } @article{LeyPeter1994, author = {Ley, J. P. and Peter, Martin G.}, title = {Synthesis of N-(2-Acetamido-2-deoxy-ß-D-glucopyranosyl)- and of N-(N,N-Diacetylchitobiosyl)-amide of lhistidine}, issn = {0039-7881}, year = {1994}, language = {en} } @article{LeySchweikartPeter1997, author = {Ley, J. P. and Schweikart, F. and Peter, Martin G.}, title = {Chitinase inhibitors}, year = {1997}, language = {en} } @article{LondershausenTurbergBieseleretal.1996, author = {Londershausen, M. and Turberg, Andreas and Bieseler, Barbara and Lennarz, M. and Peter, Martin G.}, title = {Characterization and Inhibitor Studies of Chitinases from Parasitic Blowfly (Lucilia cuprina), Tick (Boophilus micoplus), Intestinale Nematode (Haemonchus contortus), and a Bean (Phaseolus vulgaris)}, year = {1996}, language = {en} } @article{LondershausenTurbergSpindlerBarthetal.1996, author = {Londershausen, M. and Turberg, Andreas and Spindler-Barth, Margarethe and Peter, Martin G.}, title = {Screening Test for Insecticides Interfering with Cuticular Sclerotization}, year = {1996}, language = {en} } @article{LopezFrancoCalderondelaBarcaValdezetal.2008, author = {L{\´o}pez-Franco, Yolanda L. and Calder{\´o}n de la Barca, Ana M. and Valdez, Miguel A. and Peter, Martin G. and Rinaudo, Marguerite and Chambat, G{\´e}rard and Goycoolea, Francisco M.}, title = {Structural characterization of mesquite (Prosopis velutina) gum and its fractions}, issn = {1616-5187}, doi = {10.1002/mabi.200700285}, year = {2008}, abstract = {Structural and physicochem. characteristics of mesquite gum (from Prosopis velutina) were investigated using FT- IR spectroscopic, mass spectrometric and chromatog. methods. Four fractions (F-I, F-IIa, F-IIb and F-III) were isolated by hydrophobic interaction chromatog. The samples were characterized and analyzed for their monosaccharide and oligomers compn. by high performance anion-exchange chromatog. with pulsed amperometric detection (HPAEC-PAD). L-Arabinose (L-Ara) and D-galactose (D-Gal) were found as the main carbohydrate constituent residues in the polysaccharides from mesquite gum and their ratio (L-Ara/D-Gal) varied within the range 2.54 to 3.06 among the various fractions. Small amts. of D- glucose (D-Glc), D-mannose (D-Man) and D-xylose (D-Xyl) were also detected, particularly in Fractions IIa, IIb and III. IR spectroscopy identified polysaccharides and protein in all the samples. Data from mass spectrometry (MALDI-TOF MS) was consistent with the idea that the structure corresponding to the periphereal chains of Fraction I is predominantly a chain of pentoses attached to uronic acid. [on SciFinder (R)].}, language = {en} } @article{MenezesGrigolonTodorovicetal.2009, author = {Menezes, Bruno M. and Grigolon, Lisanne and Todorovic, Zoran and Peter, Martin G. and Franco, Telma T.}, title = {On the depolymerization of chitosan by papain : a re-assessment}, year = {2009}, language = {en} } @article{MengibarGananMirallesetal.2011, author = {Mengibar, M. and Ganan, M. and Miralles, B. and Carrascosa, A. V. and Martinez-Rodriguez, Adolfo J. and Peter, Martin G. and Heras, A.}, title = {Antibacterial activity of products of depolymerization of chitosans with lysozyme and chitosanase against Campylobacter jejuni}, series = {Carbohydrate polymers : an international journal devoted to scientific and technological aspects of industrially important polysaccharides}, volume = {84}, journal = {Carbohydrate polymers : an international journal devoted to scientific and technological aspects of industrially important polysaccharides}, number = {2}, publisher = {Elsevier}, address = {Oxford}, issn = {0144-8617}, doi = {10.1016/j.carbpol.2010.04.042}, pages = {844 -- 848}, year = {2011}, abstract = {Chitosan has several biological properties useful for the food industry, but the most attractive is its potential use as a food preservative of natural origin due to its antimicrobial activity against a wide range of food-borne microorganisms. Among food-borne pathogens, Campylobacter jejuni and related species are recognised as the most common causes of bacterial food-borne diarrhoeal disease throughout the world. Recently, it has been demonstrated that campylobacters are highly sensitive to chitosan. Even though chitosan is known to have important functional activities, poor solubility makes them difficult to use in food and biomedical applications. Unlike chitosan, the low viscosity and good solubility of chitosan oligosaccharides (COS) make them especially attractive in an important number of useful applications. In the present work, the effect of different COS on C. jejuni was investigated. Variables such as the physicochemical characteristics of chitosan and the enzyme used in COS preparation were studied. The COS had been fractioned using ultrafiltration membranes and each fraction was characterized regarding its FA and molecular weight distribution. It has been demonstrated that the biological properties of COS on Campylobacter depend on the composition of the fraction analysed. COS prepared by enzymatic hydrolysis with chitosanase were more active against Campylobacter that lysozyme-derived COS, and this behaviour seems to be related with the acetylation of the chains. On the other hand. the 10-30 kDa fraction was the most active COS fraction, independently of the enzyme used for the hydrolysis. These results have shown that COS could be useful as antimicrobial in the control of C. jejuni.}, language = {en} } @article{MiessnerPeterVincent2001, author = {Miessner, Merle and Peter, Martin G. and Vincent, Julian F. V.}, title = {Preparation of Insect-Cuticle-Like Biomimetic Materials}, year = {2001}, abstract = {A model system of tanning of a protein matrix within a fibrous structure, such as most commonly found in insect cuticle, was developed, using the cellulose of paper in place of chitin. The paper was impregnated with a tripeptide, DOPA-Gly-Gly, or a protein (BSA) plus catechol and treated with tyrosinase to oxidize the catechol. The resulting material was waterproof and had very high wet strength. If the material was wetted and dried repeatedly its water retention decreased by a factor of at least two.}, language = {en} } @misc{MoerschbacherJaworskaPeter2020, author = {Moerschbacher, Bruno and Jaworska, Małgorzata and Peter, Martin G.}, title = {Obituary of George A.F. Roberts (1939-2018)}, series = {Reactive \& functional polymers}, volume = {156}, journal = {Reactive \& functional polymers}, publisher = {Elsevier}, address = {Amsterdam [u.a.]}, issn = {1381-5148}, doi = {10.1016/j.reactfunctpolym.2020.104711}, pages = {3}, year = {2020}, language = {en} } @article{NorledgeLambeirAbagyanetal.2001, author = {Norledge, Brian V. and Lambeir, Anne M. and Abagyan, Ruben and Rottmann, Antje and Fernendez, Anna M. and Filimonov, Vladimir V. and Peter, Martin G. and Wierenga, Rik K.}, title = {Modeling, mutagenesis, and structural studies on the fully conserved phoshate-binding loop (Loop 8) of triosephosphate isomerase : toward a new substrate specificity}, issn = {0887-2585}, year = {2001}, language = {en} } @article{OliveiraelGueddariMoerschbacheretal.2008, author = {Oliveira, Enio N. and el Gueddari, Nour E. and Moerschbacher, Bruno M. and Peter, Martin G. and Franco, Telma T.}, title = {Growth of phytopathogenic fungi in the presence of partially acetylated chitooligosaccharides}, issn = {0301-486X}, year = {2008}, abstract = {Four phytopathogenic fungi were cultivated up to six days in media contg. chitooligosaccharide mixts. differing in av. DP and F A. The three different mixts. were named Q3 (which contained oligosaccharides of DP2-DP10, with DP2-DP7 as main components), Q2 (which contained oligosaccharides of DP2-DP12, with DP2-DP10 as main components) and Q1 (which derived from Q2 and contained oligomers of DP5-DP8 with hexamer and a heptamer as the main components). The novel aspect of this work is the description of the effect of mixts. of oligosaccharides with different and known compn. on fungal growth rates. The growth rate of Alternaria alternata and Rhizopus stolonifer was initially inhibited by Q3 and Q2 at higher concns. Q1 had a growth stimulating effect on these two fungi. Growth of Botrytis cinerea was inhibited by Q3 and Q2, while Q1 had no effect on the growth of this fungus. Growth of Penicillium expansum was only slightly inhibited by higher concns. of sample Q3, while Q2 and Q1 had no effect. The inhibition of growth rates or their resistance toward chitooligosaccharides correlated with the absence or presence of chitinolytic enzymes in the culture media, resp. [on SciFinder (R)]}, language = {en} } @article{PazPeterSchmidtetal.2012, author = {Paz, Cristian and Peter, Martin G. and Schmidt, Bernd and Becerra, Jose and Gutierrez, Margarita and Astudillo, Luis and Silva, Mario}, title = {Synthesis and AChE inhibiting activity of 2, 4 substituted 6-Phenyl Pyrimidines}, series = {Journal of the Chilean Chemical Society}, volume = {57}, journal = {Journal of the Chilean Chemical Society}, number = {3}, publisher = {Sociedad Chilena De Quimica}, address = {Concepcion}, issn = {0717-9324}, pages = {1292 -- 1294}, year = {2012}, abstract = {Novel substituted pyrimidines were synthesized from methyl 2,4-dioxo-4-phenyl-butanoate (I-A) and urea, followed by Mitsunobu coupling of I-A with benzyl or allyl alcohol to give the corresponding 2-hydroxypyrimidine ethers in good yields. Saponification of I-A, followed by reaction with benzyl or allyl amines in the presence of TBTU yielded 2-hydroxy-6-phenyl-pyrimidine 4-carboxamides. AChE and BuChE assays revealed 2-hydroxy-6-phenyl-pyrimidine-4-carboxyallyamide as the most active compound, IC50=90 mu M, with no inhibition of BuChE.}, language = {en} } @article{PeikowMaternPeteretal.2005, author = {Peikow, Dirk and Matern, Christa-Maria and Peter, Martin G. and Schilde, Uwe}, title = {Crystal structure of (1,4,7,10,13-pentaoxacyclopentadecane-O,O ',O '',O ''')(trifluoromethanesulfonato-O,O ')sodium, Na(C10H20O5)(CF3SO3)}, year = {2005}, abstract = {C11H20F3NaO8S, monoclinic, P121/nil (no. 11), a = 7.947(1) angstrom, b = 12.056(1) angstrom, c = 9.083(1) angstrom, P = 106.01 (1)degrees, V = 836.4 angstrom(3), Z = 2, R-gt(F) = 0.043, wR(ref)(F-2) = 0.120, T = 210 K.}, language = {en} }