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CHROMATOGRAPHY & SPECTROSCOPY
High Sensitivity GPC Triple Detector System for Polymer & Protein Characterisation
The new SEC-3010 triple detector system from Dorton Analytical Ltd sets a new standard for high performance characterisation of polymers and proteins using Gel Permeation Chromatography/Size Exclusion Chromatography (GPC/SEC).
The SEC-3010 triple detector system is a complete GPC system comprising pump, autosampler, viscosity/refractive index detector, multi-angle light scattering detector and ParSEC enhanced software.
The patented design of the SEC-3010 Viscosity/Refractive Index Detector allows the simultaneous determination of the refractive index and the intrinsic viscosity of a polymer solution. With its sophisticated technology, it overcomes the disadvantages usually encountered when using coupled detectors. The asymmetrical bridge circuit allows 80% of the sample to reach the measuring arm compared with 50% in conventional instruments, thus increasing sensitivity by a factor of 2. The direct integration of the refractive index measuring cell in the analytical arm of the viscometer allows the determination of the intrinsic viscosity and the refractive index in exactly the same sample segment.
The Multi-Angle Light-Scattering Detector is a modern, intuitive, 7-angle detector for the comprehensive characterisation of macromolecular compounds. Its innovative technology offers the highest quality and precision in the absolute determination of molecular weight. The sample is illuminated by a very precise, temperature-controlled laser beam. The scattered light is collected by a highly-sensitive CCD detector which transmits the data to the ParSEC software.
ParSEC Enhanced provides the complete software solution for comprehensive polymer characterisation via multi-detector GPC. The software records and evaluates the data from various combinations of GPC detectors. It calculates the specific and intrinsic viscosity, the Mark-Houwink coefficients, the absolute molecular weights, Mn, Mw, Mz, Rg, the Mw/Mn structure coefficients and the branching parameters from the scattered light data. All analytical methods, raw data, calibrations, results and sample information are stored in a single database, allowing very easy archiving and retrieval of data.
Circle no. 33
Rock and Mineral FTIR Diffuse Reflectance Spectral Libraries
A2 Technologies' has announced the availability of two new diffuse reflectance mid-infrared spectral libraries of rocks and minerals further extending the utility of their innovative Exoscan and FlexScan handheld FTIR analysers for geoscience applications. The first library contains spectra of general rocks and minerals sourced from around the world, while the other is focused on commercially important or strategic minerals.
FlexScan and Exoscan are the world's first FTIR analysers that have the performance and robustness to be applicable to field based geoscience investigations. The analysers are equipped with diffuse reflectance sampling interfaces, thus enabling rocks, minerals and soils to be analysed with minimal, or no sample preparation. Now, minerals of interest located in outcroppings, ore bodies, drill cores, and mines can be analysed directly at the locale. The capability of FTIR to elucidate how atoms are bound together to form the chemistry of rocks and minerals is an important complement to widely used hand-held XRF analysers, which identify the elements that comprise the geological sample.
The diffuse reflectance infrared spectra of rocks and minerals are different than those that are contained in classical transmission IR libraries that already exist. For this reason, A2 Technologies is building, and will continue to build, these unique diffuse reflectance libraries in support of its efforts to bring FTIR analysers to geoscience applications. Since the chemistry of rocks and minerals is complex and highly dependent on the specific locale and condition of formation, A2 Technologies analysers permit users to easily create their own diffuse reflectance IR libraries to meet the requirements of their particular area of interest.
Circle no. 34
Spectroscopy Software Add-on Calculates PAR
A new add-on module for Ocean Optics’ SpectraSuite Spectrometer Operating Software allows users of the company’s miniature spectrometers and Jaz optical sensing systems to calculate Photosynthetically Active Radiation (PAR), an important parameter for evaluating the effect of light on plant growth.
SpectraSuite-PAR uses the absolute irradiance spectrum (captured by the spectrometer) of the light incident on plants and other samples and conveniently converts the irradiance values from µW/cm2 (microwatts per square centimetre) to µmol/m2/s (micromoles per square meter per second), the measurement unit more commonly used for PAR analysis.
In addition to calculating total PAR, SpectraSuite-PAR allows users to define up to five ‘wavelength bins’ (the range of wavelengths to be covered in each data bin), which can be correlated to different phases of plant growth.
SpectraSuite-PAR is a particularly powerful analytical tool when used as part of a field-portable Jaz sensing system configured for horticultural applications. Jaz is a family of modular, stackable components that share common electronics and communications. At its heart is a miniature CCD-array spectrometer, or light measuring device, available with user-selected grating and slit options optimised for a variety of optical sensing application needs. Also incorporated into the Jaz stack is a powerful microprocessor and onboard display with data logging capability, so that full spectra data can be acquired, processed and stored to an SD card without the need for a PC. Jaz irradiance measurement software is also available and nicely complements the SpectraSuite- PAR functions.
SpectraSuite is the standard operating software for Ocean Optics spectrometers. The modular, Java-based spectroscopy software platform operates on Windows, Macintosh and Linux operating systems.
Circle no. 35 Circle no. 36
INTERNATIONAL LABMATE - OCTOBER/NOVEMBER 2010 - CHROMATOGRAPHY & SPECTROSCOPY
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