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51.
A rapid gas chromatographic method for the determination of medium-chain and long-chain free fatty acids (C14:0 to C24:0 fatty acids) from different biological specimens is presented. After a rapid one-step transesterification method in methanol-acetyl chloride (50:1, v/v), fatty acid methyl esters were extracted into n-hexane and analysed on a 15-m Durabond-Wax column within a 12-min chromatographic run. The detection limit is 500 pg per injection. 相似文献
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F. W. Zerban L. Sattler J. Lorge L. G. Saywell E. P. Phillips P. Waentig F. Auerbach Emma Bodländer C. A. Browne R. T. Balch E. Saillard C. R. Marshall A. G. Norman F. Th. van Voorst W. J. de Voogt W. A. Davis C. Zäch C. R. v. Stieglitz L. C. Home H. Tryller J. Hamous N. N. Kudelja und K. Mussolin 《Fresenius' Journal of Analytical Chemistry》1940,120(5-6):210-214
Ohne Zusammenfassung 相似文献
53.
Lars E. Sattler Prof. Dr. Gerhard Hilt 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(2):605-608
The synthesis of 1,3-oxazoles from symmetrical and unsymmetrical alkynes was realized by an iodonium cation-pool electrolysis of I2 in acetonitrile with a well-defined water content. Mechanistic investigations suggest that the alkyne reacts with the acetonitrile-stabilized I+ ions, followed by a Ritter-type reaction of the solvent to a nitrilium ion, which is then attacked by water. The ring closure to the 1,3-oxazoles released molecular iodine, which was visible by the naked eye. Also, some unsymmetrical internal alkynes were tested and a regioselective formation of a single isomer was determined by two-dimensional NMR experiments. 相似文献
54.
Rameshwar U. Kadam Myriam Bergmann Matthew Hurley Divita Garg Martina Cacciarini Magdalena A. Swiderska Cristina Nativi Michael Sattler Alan R. Smyth Paul Williams Miguel Cmara Achim Stocker Tamis Darbre Jean‐Louis Reymond 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2011,123(45):10819-10823
55.
Introducing an In Situ Capping Strategy in Systems Biocatalysis To Access 6‐Aminohexanoic acid 下载免费PDF全文
Dr. Johann H. Sattler Dr. Michael Fuchs Dr. Francesco G. Mutti Barbara Grischek Dr. Philip Engel Dr. Jan Pfeffer Prof. Dr. John M. Woodley Prof. Dr. Wolfgang Kroutil 《Angewandte Chemie (International ed. in English)》2014,53(51):14153-14157
The combination of two cofactor self‐sufficient biocatalytic cascade modules allowed the successful transformation of cyclohexanol into the nylon‐6 monomer 6‐aminohexanoic acid at the expense of only oxygen and ammonia. A hitherto unprecedented carboxylic acid capping strategy was introduced to minimize the formation of the dead‐end intermediate 6‐hydroxyhexanoic acid. For this purpose, the precursor ε‐caprolactone was converted in aqueous medium in the presence of methanol into the corresponding methyl ester instead of the acid. Hence, it was shown for the first time that esterases—specifically horse liver esterase—can perform the selective ring‐opening of ε‐caprolactone with a clear preference for methanol over water as the nucleophile. 相似文献
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Brumbaugh J Schleifenbaum A Gasch A Sattler M Schultz C 《Journal of the American Chemical Society》2006,128(1):24-25
Cell function is regulated by complex and often interdependent networks of signaling molecules. To accurately describe these networks, it is important to monitor multiple signals in parallel. To this end, we have developed a genetically encoded, FRET-based probe that independently monitors both protein kinase A (PKA) and protein kinase C (PKC) activity in vivo. Artificial as well as physiological stimulants produced a negative or positive change in FRET efficiency following PKA or PKC activation, respectively. Mutations of the phosphate-accepting amino acids of the PKC substrate yielded a probe that was sensitive to PKA activation alone. 相似文献
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