Search results for "luonnonaineet"
showing 7 items of 27 documents
Candida antarctica Lipase A-Based Enantiorecognition of a Highly Strained 4-Dibenzocyclooctynol (DIBO) Used for PET Imaging
2020
The enantiomers of aromatic 4-dibenzocyclooctynol (DIBO), used for radiolabeling and subsequent conjugation of biomolecules to form radioligands for positron emission tomography (PET), were separated by kinetic resolution using lipase A from Candida antarctica (CAL-A). In optimized conditions, (R)-DIBO [(R)-1, ee 95%] and its acetylated (S)-ester [(S)-2, ee 96%] were isolated. In silico docking results explained the ability of CAL-A to differentiate the enantiomers of DIBO and to accommodate various acyl donors. Anhydrous MgCl2 was used for binding water from the reaction medium and, thus, for obtaining higher conversion by preventing hydrolysis of the product (S)-2 into the starting materi…
Formal synthesis of ent-Cephalotaxine using a one-pot Parham-aldol sequence
2018
A short formal synthesis of ent-Cephalotaxine is achieved. The approach features a new Lewis acid mediated [2,3]-Stevens rearrangement of N-allylated prolineamide to generate a key quaternary stereogenic center. Additionally, a one-pot Parham–aldol sequence was developed to rapidly assembly two of the four rings in the cephalotaxine core. peerReviewed
Synthetic studies on 1-azabicyclo[5.3.0]decane alkaloids
2018
The first chapter introduces the reader to the concept of natural product total synthesis and its importance to chemistry, other sciences, and society. The second chapter reviews the chemistry of natural products containing 1-azabicyclo[5.3.0]decane motifs. This bicyclic motif and the natural products related to it, have been a continuous source of synthetic inspiration over the last decades. The second chapter of the thesis reviews the strategies and tactics developed. The third chapter covers the author’s total synthesis of stemoamide, a 1-azabicyclo[5.3.0]decane motif containing alkaloid. Additionally, two diastereomers of stemoamide were synthesized, allowing their structural reassignme…
Mukaiyama-Michael reactions with α-substituted acroleins - a useful tool for the synthesis of the pectenotoxins and other natural product targets
2013
Psychrophiles: A source of cold-adapted enzymes for energy efficient biotechnological industrial processes
2021
Biocatalysts are the backbone of bioprocessing industries that are going through a phase of transition with reference to the requirement of extraordinary enzymes for various biochemical processes. This transition is well reported and documented by various researchers through elucidation of different features and applications of mesophilic and thermophilic enzymes. However, there is little information available about psychrophilic enzymes and their involvement in industrial processes. Therefore, understanding the features and functions of psychrophilic enzymes could suggest some of their novel applications in various industries such as food, agriculture, chemicals, pharmaceuticals, and waste…
Generation and utilisation of natural product library for bioactivity screening and drug discovery
2006
Uusia lääkkeitä tarvitaan jatkuvasti. Koska luonnonaineet sisältävät bioaktiivisia yhdisteitä ja uusia kemiallisia rakenteita, ne tarjoavat lähes rajattoman uusien lääkeaineiden lähteen. Bioaktiivisuusseulontaan soveltuvan luonnonainekirjaston luomisen avulla voidaan luonnonaineisiin perustuvaa lääkekehitystutkimusta tehostaa lyhentäen prosessin normaalisti vaatimaa aikaa. Tässä työssä perustettiin luonnonaine (LA) kirjastojärjestelmä Lääkkeen keksintä- ja kehitysteknologian keskukselle (DDTC), joka on monitieteinen tutkimusyksikkö Helsingin yliopiston farmasian tiedekunnassa. Kokeellinen LA-kirjasto, joka sisältää sekä näytemateriaalia että tietokannan, perustettiin kesällä 2000 satunnaise…
Can foliar-applied nutrients improve caraway (Carum carvi L.) seed oil composition?
2021
Caraway seeds contain between 0.5–7% essential oil, rich in monoterpenes that have a characteristic aroma and chemical properties. Caraway oil has several bioactive compounds that are of industrial importance, particularly for pharmaceutical and health care products. Carvone and limonene are the main terpenes present in caraway oil, which along with some unique fatty acids (i.e. petroselinic acid) determine caraway (Carum carvi L.) oil quality. Both terpenes are important raw materials for industrial applications and their concentration influences the price of caraway seed and oil, hence there is need for identifying management practices that may increase the concentration of these and othe…