Archive for the ‘Miscellaneous’ Category

Extractable Petroleum Hydrocarbons (EPH) Method – Why it is important?

Spills and releases of petroleum fuels are the largest source of environmental contamination in the United States. Massachusetts published a method that addresses the need to account for semi-volatile aliphatic and aromatic fractions of gasoline using gas chromatography (GC) analysis and a flame ionization detector (FID). This method was designed to measure the collective concentrations […]

LC Columns: High-Pressure Survival of the Fittest!

As an R&D Chemist charged with developing the perfect packing method for new LC columns, one of the challenges is finding a packing method that results in a column which not only passes QC specifications but also passes our arduous lifetime analysis. During lifetime testing our columns are subjected to 1,000 continuous injections at 12,000 […]

Utilizing Restek Reference Standards for Residual Solvent Testing

Restek manufactures several different residual solvent standards.  These can be used for testing according to USP <467>, the EP monograph, or other residual solvent assays, such as medical cannabis testing.   The calculations involved for the use of these standards has led to questions for our technical team.  This post should help provide guidance for their […]

Need parts for your Agilent 1100? HP 1050? Restek has you covered.

As of May 31, 2015, 1100 Series HPLC systems were categorized “End of Guaranteed Support” (EGS) by Agilent. Agilent would prefer it if you purchased a new system from them, but 1100 HPLCs are dependable workhorses. Why not keep them running with instrument replacement parts from Restek? Check out our selection, easily sorted by instrument and module: […]

Chemistry Nobel Prize 2016

The 2016 Nobel Prize in chemistry was jointly awarded today to Jean-Pierre Sauvage, Sir Fraser Stoddart, and Bernard Feringa for their research in supramolecular chemistry, specifically, for the development of molecular machines. These molecular machines use self-assembly, host-guest interactions, and mechanically interlocked molecular architectures to generate nanometer scale mechanical motion in response to an external […]

How Dirty Are You? Part 5…Micropipette Tips

Pipettes are common tools for drawing and dispensing precise volumes in chemical, biological and medical labs. Thanks to the invention of micropipettes and other techniques, we don’t do mouth pipetting anymore. Positive displacement pipettes are particularly useful because the air gap in standard micropipettes are replaced by capillary pistons, which greatly improve the accuracy for […]

RIP Philae

The exact resting place of the Philae lander on Comet 67P/Churyumov-Gerasimenko has finally been pinpointed, in new photographs by the Rosetta orbiter. Rosetta did a close pass of the comet on September 2nd and the survey caught the first clear glimpse of Philae’s position.   I’m so proud that Restek was able to contribute columns […]

Impact of pH on Derivatization of Nitrophenol Compounds

Our goal of evaluating the Normalized French Environmental Method 12673 required testing the method’s ability to derivatize nitrophenols and alkylphenols in addition to the chlorophenols the method was designed for. Unfortunately, nitrophenols proved challenging to derivatize at low concentrations. In an effort to improve the derivatization of nitrophenols, we experimented with the pH of the […]

Improved Peak Symmetry as a Result of Derivatization of Phenols

Peak symmetry is important for determination and quantification of compounds. In order to create a symmetric peak, the compound must be able to elute all at more or less the same time. If a compound interacts with the column itself (ex: by temporarily adsorbing to the fused silica surface), it delays travel and effects peak […]

Nobel Laureate Talks and Restek Champagne Reception

From July 19th – 22nd 2016 Restek Corporation with the collaboration of the German Restek Office (Restek GmbH) attended the 39th ISEAC conference, organized from the “International Association of Environmental Analytical Chemistry” (IAEAC) at the Hamburg School of Food Science, lead by  Prof. Dr. Markus Fisher. The central subject of the ISEAC-39 conference is the innovative use […]