AL
ethanol production from bioethanol plants and breweries. The analyzer is useful in method development, process control and lot release.
High-resolution cross-fractionation
chromatograph Polymer Char (Valencia, Spain), specialists in chromatographic analysis of polyolefi ns, intro- duced a system for automated high-resolution cross-fractionation chromatography (CFC). CFC is a two-dimensional chromatographic process in which the sample is fractionated using temperature-rising elution fractionation (TREF) in the fi rst dimension. The sample is heated in a solvent and the resulting solution is transferred to a gel permeation chromatog- raphy (GPC) column and eluted. While the fi rst sample is eluted, TREF is programmed up by 1–3 °C. The newly dissolved material is passed to a second identical GPC column for elution in parallel. Then the fi rst column is ready for the third sample from the TREF. This process continues over several hours with fractions 1, 3, 5 ... (odd) chromatographed on column 1 and the even-numbered samples chromato- graphed on column 2. The result is a 3-D plot of GPC response as a function of log[M] and temperature, which can be related to sample structure and mechanical properties.
Detectors for LC Wyatt Technologies (Santa Barbara, Calif.) exhibited the μDAWN multi-angle laser light scattering (MALS) detector for UHPLC. The fl ow-cell volume on previous MALS models had a volume of about 60 μL, which is very large for UHPLC instruments. For the μDAWN, the volume was reduced to 6 μL, reducing band broadening by about 25×. Faster electronics and improved light isolation are included, as is the Comet ultrasonic fl ow-cell cleaner. μDawn can be combined with the Optilab UT-rEX high- sensitivity diff erential refractive index detector to provide a complete μSEC (size exclusion chromatography)-MALS detection system for natural and synthetic polymers.
Solid-phase extraction systems In response to the demand for higher sample throughput, solid-phase extraction (SPE) is mi- grating from individual tubes to multiple-well plates. Several companies introduced liquid handlers specifi cally optimized for SPE in ANSI 96- and 384-well formats.
Aurora Biomed, Inc. (Vancouver, B.C.) intro- duced an updated version of the VERSA 1100 SPE workstation. In addition to 96-well plates, the VERSA can handle racks of 1-, 3- and 6-mL tubes (see Figure 5). Both positive pressure
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Figure 5 – VERSA SPE workstations fully automate SPE workfl ow from cartridge conditioning to sample derivatization on a single deck and ensure effi cient fl ow of samples and reagents through cartridges with modules such as ReagentDrop, Heater-Shaker, Gripper and Nitrogen Dryer. (Image courtesy of Aurora Biomed.)
AMERICAN LABORATORY 21 MAY 2016
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