Part No: PPS510Issued year: 2019File size: 1.24mbFile type: pdf
Peptide purification via flash
chromatography has recently been demonstrated as a viable
alternative to the more standard HPLC methods currently
utilized. Flash chromatography offers peptide chemists the
advantage of significantly greater loading capacity reducing the
overall purification time but with a compromise of decreased
peak resolution. Herein we present several strategies that,
when implemented, allow for very high purity peptide samples
purified by flash chromatography.
Part No: PPS443.V.1Issued year: 2019File size: 2.98mbFile type: pdf
Analysis of drug panels in urine samples can be challenging, and the trend towards larger panels including multiple drug classes compounds the issues faced during method development.
This white paper examines a number of aspects of sample preparation, and their impact on the success of subsequent LC-MS/MS analysis of broad urine panels.
Section 1 examines the applicability of various sample preparation techniques: supported liquid extraction, reverse phase SPE and mixed-mode SPE, to the various classes of drugs extracted. In addition, hydrolysis approaches: enzyme type and protocol used (time, temperature), are compared.
Mixed-mode reverse phase/cation exchange SPE is widely used for extraction of basic drug classes from urine, but the inclusion of drugs and metabolites that exhibit ‘non-typical’ functionality within urine panels can be problematic. Section 2 examines the impact of various parameters (interference wash strength, elution solvent composition) on analyte retention, elution and extract cleanliness with particular focus on zwitterionic (gabapentin, pregabalin) and non-ionic (carisoprodol, meprobamate) drugs.
Part No: PPS490.gerIssued year: 2019File size: 1.65mbFile type: pdf
Die Flash-Chromatographie ist die bevorzugte
Reinigungsmethode für organische Stoffe, Arzneimittel und
Naturstoffe. In jüngster Zeit hat sie auch die Peptidchemie
erobert, verfügt sie doch über die Fähigkeit, eine Vielzahl
unterschiedlicher Verbindungen effizienter zu trennen, als dies
mit anderen Vorreinigungsverfahren wie z. B. dem Ausfällen
(Protein-Crash) oder der Flüssig-Flüssig-Extraktion möglich ist.
Zur Herstellung reiner Verbindungen können Chemiker je nach
dem gewünschten Reinheitsgrad auf eine Vielzahl unterschiedlicher
Variablen zurückgreifen. In diesem Whitepaper möchten
wir die Faktoren erläutern, die für eine erfolgreiche Aufreinigung
mithilfe der Flash-Chromatographie kontrolliert werden müssen.
Part No: P147Issued year: 2016File size: 0.27mbFile type: pdf
For as long as column chromatography has been practiced by
organic and medicinal chemists there has been a concern that too
much methanol in the solvent system will dissolve the column’s
silica. This concern has come about because chemists often find a
solid white precipitate in collected fractions after purification. This
phenomenon is usually noticed when dichloromethane and
methanol are used as the mobile phase solvents.
In this poster we will show the results of a study that evaluated the
degree of dissolution for both granular and spherical silica in
methanol and dichloromethane.
Part No: PPS476.v1Issued year: 2019File size: 1.72mbFile type: pdf
Oral fluid is of increasing importance as a biological matrix in drugs of abuse and related analyte testing because of the ease of sample collection, and difficulty in adulteration of samples, particularly
when compared with urine.
Part No: PPS468Issued year: 2017File size: 0.71mbFile type: pdf
Producing peptides for research is challenging. Biotage has developed
a holistic approach to the entire peptide workflow via an automated solution, designed for dedicated peptide researchers and those new to the field.
Part No: PPS466.GermanIssued year: 2017File size: 0.41mbFile type: pdf
Modelle haben gezeigt, dass sich die zur Herstellung
eines Zielmoleküls benötigte Zeit mit dem automatisierten
Workflow von Biotage um bis zu achtzig
Prozent verkürzen lässt, sodass auch die Projektlaufzeiten
entsprechend verkürzt werden können.
Part No: PPS463Issued year: 2017File size: 1.74mbFile type: pdf
Traditional approaches to compound purification involving chromatography utilize large volumes of relatively toxic and expensive solvents, and significantly contribute to the environmental footprint of organizations involved in molecular research. Current directives for greener chemistry have put pressure on organizations to reduce the
environmental impact of their work.
Part No: PPS463.gerIssued year: 2018File size: 0.68mbFile type: pdf
Bei herkömmlichen Aufreinigungsverfahren mittels Chromatographie kommen große Mengen verhältnismäßig giftiger und teurer Lösungsmittel zum Einsatz, die sich negativ auf den ökologischen Fußabdruck von Unternehmen in der Molekularforschung auswirken. Neue Richtlinien für einen verantwortungsvolleren Umgang mit Chemikalien zwingen Unternehmen, die Umweltauswirkungen ihrer Arbeit zu reduzieren. Durch Einblicke in die Arbeitsabläufe dieser Unternehmen und neue Entwicklungen im Bereich Flash-Chromatographiesysteme und -säulen lassen sich Verbrauch und Toxizität der für die Aufreinigung eingesetzten Lösungsmittel und somit auch die Umweltbelastungen dieser Verfahren reduzieren.
Part No: PPS466Issued year: 2017File size: 1.4mbFile type: pdf
Using the Biotage automated workflow, models have shown that the time taken to produce a target molecule can be reduced by up to eighty percent, allowing project delivery timescales to be reduced
accordingly.