Automated purification and quantification of oligonucleotides

The isolation of water-soluble natural products - challenges, strategies and perspectives

Covering period: up to 2019Water-soluble natural products constitute a relevant group of secondary metabolites notably known for presenting potent biological activities. Examples are aminoglycosides, β-lactam antibiotics, saponins of both terrestrial and marine origin, and marine toxins. Although extensively investigated in the past, particularly during the golden age of antibiotics, hydrophilic fractions have been less scrutinized during the last few decades. This review addresses the possible reasons on why water-soluble metabolites are now under investigated and describes approaches and strategies for the isolation of these natural compounds. It presents examples of several classes of hydrosoluble natural products and how they have been isolated. Novel stationary phases and chromatography techniques are also reviewed, providing a perspective towards a renaissance in the investigation of water-soluble natural products.

Parallel, Large-Scale, and Long Synthetic Oligodeoxynucleotide Purification Using the Catching Full-Length Sequence by Polymerization Technique

The catching by polymerization synthetic oligodeoxynucleotide (ODN) purification technique was shown to be potentially suitable for high throughput purification by purifying 12 ODNs simultaneously, to be convenient for large-scale purification by purifying at 60 μmol synthesis scale, and to be highly powerful for long ODN purification by purifying ODNs as long as 303-mer. LC-MS analysis indicated that the ODNs purified with the technique have excellent purity.

Synthetic polymer systems in drug development

The use of synthetic polymers in drug discovery is reviewed, with particular reference to the increasing number of chemistries for therapeutic candidate preparation that employ linear polymers possessing differential solubilities in a variety of solvents. The uses of these polymers as primary components in liquid-phase organic synthesis, particularly applied to the generation of chemical compound libraries, are discussed, along with the challenges facing synthetic chemists and pharmaceutical scientists in preparing new and more efficient supports. The advantages inherent to the emerging field of liquid-phase combinatorial synthesis (LPCS) are considered and a number of key therapeutic targets prepared by newer polymer-supported routes are highlighted. Finally, the potential development issues for both liquid and solid-phase organic chemistries applied to parallel or combinatorial synthesis are discussed, taking into account future trends in the drug discovery and development process as a whole.