Search for dissertations about: "amino acids"

Showing result 1 - 5 of 776 swedish dissertations containing the words amino acids.

2. 1. Amino acid-catalyzed synthesis of amino acid derivatives : Application and semi-synthesis of Paclitaxel, Docetaxel and their derivatives

   Author : Pawel Dziedzic; Armando Córdova; Stephen Hanessian; Stockholms universitet; []
   Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Organocatlysis; amino acids; syntesis; Taxol and Taxotere derivatives; Chemistry; Kemi; organisk kemi; Organic Chemistry;

   Abstract : This thesis deals with different applications of organocatalysis, where amino acid derivatives and small peptides are applied as catalysts. First, the development of environmentally friendly aldol reactions, carried out in aqueous media is illustrated. The corresponding β-hydroxy ketones are formed with ee´s up to 99%. READ MORE

4. 2. Conformations of amino acids characterized by theoretical spectroscopy

   Author : Hongbao Li; Yi Luo; Tanja van Mourik; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; amino acids; spectroscopy; Teoretisk kemi och biologi; Theoretical Chemistry and Biology;

   Abstract : Amino acids are the basic building blocks of proteins. The determinationof their structures plays an important role in correctly describing the functionsof the proteins. READ MORE

5. 3. Amino acids with relevance to health, climate and the environment : Development of mass spectrometric methods

   Author : Javier Zurita; Leopold Ilag; Ulrika Nilsson; Margareta Törnqvist; Natalia Tretyakova; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; amino acids; LC MS; fixed-charge derivatization; BMAA; chiral separation; pheromones; arctic aerosols; serum albumin adducts; benzo[a]pyrene diol epoxides; high-resolution MS; Analytical Chemistry; analytisk kemi;

   Abstract : Amino acids play vital roles in health, either in their native form or chemically modified. Some studies have linked certain non-proteinogenic amino acids to neurodegenerative diseases, such as in the case of β-methylaminoalanine (BMAA). READ MORE

6. 4. Synthesis of aromatic bis- and tris(amino acids) and chiral dendrimers

   Author : Andreas Ritzén; Centrum för analys och syntes; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Organisk kemi; Organic chemistry; HWE reaction; asymmetric hydrogenation; Heck reaction; Amino acids; chiral dendrimers;

   Abstract : A number of protected aromatic bis- and tris(amino acids) have been synthesised by catalytic asymmetric hydrogenation of the corresponding didehydroamino acid derivatives. The didehydroamino acid derivatives were prepared either by a Heck coupling of a 2-amidoacrylate with an aryl dihalide, or by Horner-Wadsworth-Emmons olefination of aromatic aldehydes with phosphonylglycine reagents. READ MORE

7. 5. Mass Spectrometry of Biologically Active Small Molecules : Focusing on polyphenols, alkaloids and amino acids

   Author : Zdeněk Spáčil; Leopold L. Ilag; Frantisek Turecek; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; LC-MS; LDI; Mass spectrometry; HPLC; UHPLC; polyphenols; phenolic acids; BMAA; Separation methods; Separationsmetoder; Analytical chemistry; Analytisk kemi; Analytical Chemistry; analytisk kemi;

   Abstract : The foci of this dissertation are on advanced liquid chromatography (LC) separation and mass spectrometry (MS) techniques for the analysis of small bioactive molecules. In addition to discussing general aspects of such techniques the results from analyses of polyphenols (PPs), alkaloids and amino acids published in five appended studies are presented and discussed. READ MORE