Zobrazeno 1 - 10
of 31
pro vyhledávání: '"Lutz Grotjahn"'
Publikováno v:
Tetrahedron Letters. 25:5373-5376
Negative ion FAB-MS is recommended for the rapid routine identification of monomeric as well as oligomeric building blocks used in the phosphotriester synthesis of DNA fragments.
Publikováno v:
Plant Physiology. 83:475-478
The phenylpropane metabolism of tomato (Lycopersicon esculentum Mill) cotyledons was investigated. The HPLC analysis revealed two hydroxycinnamic-acid conjugates as major components, identified as chlorogenic acid (5-O-caffeoylquinic acid) and caffeo
Publikováno v:
Zeitschrift für Naturforschung-Section C Journal of Biosciences 40 (1985), Nr. 1-2
Two isomeric C-glycosides of apigenin (apigenin-6-C-glucosyl-8-C-arabinoside (schaftoside), apigenin-6-C-arabinosyl-8-C-glucoside (isoschaftoside)) were isolated from leaves of Ficus carica with preparative HPLC. 1The glycosides were identified by UV
Publikováno v:
Zeitschrift für Naturforschung B. 42:897-902
From the extract of 3991 venom glands of the most common European wasp species Paravespula vulgaris a novel basic pentadecapeptide was isolated and investigated by amino acid analysis, micro-Edman-degradation and fast atom bombardment mass spectromet
Publikováno v:
Zeitschrift für Naturforschung B. 39:248-251
Hydrogenobalam in (metal-free vitamin B12) and cupribalamin are characterized by their fast atom bombardment (FAB) mass spectra which show molecular ion and characteristic fragment ion peaks. These spectra and the high-resolution FAB mass spectrum of
Publikováno v:
Chemische Berichte. 111:1404-1412
Aus dem Cyclosteroid 1 wie den A-Nor-Steroid-dienen 2 und 4 wurde durch HBr-induzierte, regioselektive Doppelbindungsisomerisierungen das 17α-konfigurierte A-Nor-Steroid-dien 3a dargestellt. Die Isomerisierungen (Δ8(9) bzw (Δ8(14) Δ14) verlaufen
Publikováno v:
Zeitschrift für Naturforschung B. 38:1665-1668
The title compound 7 is prepared in a five-step synthesis starting from 1,2-di-O-acetyl-5-O-benzoyl-3-deoxy-3-O-(diethoxyphosphonomethyl)-β-D-ribofuranose (2). The preferred conformation of 7 is derived from its 1H and 13C NMR data
Publikováno v:
Analytical Biochemistry. 156:424-435
A study of mono- and dinucleotides by utilizing negative ion fast atom bombardment (FAB), metastable decomposition of (M-H)- species, and collisionally activated decomposition (CAD) of (M-H)- species is reported. Data were obtained for several comple
Publikováno v:
Phytochemistry. 25:2605-2608
New hydroxycinnamic acid esters have been isolated from primary leaves of rye and identified as positional isomers of (E)-0-feruloylgluconic acids on the basis of TLC, HPLC, FAB mass spectrometry, 1H NMR and 13C NMR spectroscopy. The 2-(E)-0-feruloyl
Publikováno v:
Biochemistry. 23:2026-2031
Negative ion fast atom bombardment mass spectrometry has been used to distinguish between (Sp)-adenosine 5'-O-(1-thiotriphosphate) containing either an alpha- nonbridging or an alpha-beta-bridging 18O label. The method does not require any nucleotide