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Report on Polarimeter Research at the University of Leeds
Professor Andrew J Wilson is Professor of Organic Chemistry in The School of Chemistry at the University of Leeds and current Deputy Director of the Astbury Centre for Structural Molecular Biology. His interests include the application of synthetic chemistry to problems in chemical biology and nanotechnology.
Polarimetry is regarded as a standard analytical characterisation technique. The Leeds Schmidt + Haensch Polartronic H532 Polarimeter is primarily used for the characterisation of chiral molecules that have been synthesised in the School of Chemistry, either for confirmation of specific rotation of a previously reported molecule, or for the completion of the characterisation of a novel molecule to appropriate scientific rigour. For example, some researchers are involved in the synthesis of unnatural amino acids, where it is essential that enantiopurity is established before further experimentation is done - where specific rotations are cornerstone in confirming chiral purity of synthesised molecules. accuracy and reproducibility so the decision was made to replace it.
Speaking about the reasons behind choosing the Schmidt + Haensch polarimeter, Professor Wilson said: "the benefit of the S&H polarimeter is the precision of the instrument which can resolve and stabilise rotations to four decimal places rapidly and consistently. The specific rotation calculation is also a useful feature that has been well used by members of the department. Researchers within the school who have been using the polarimeter are pleased with its performance and simplicity."
Schmidt + Haensch have pioneered the technology behind polarimetry and refractometry. They now hold several key patents, enabling them to produce opto-electronic measuring instruments of the highest quality and accuracy. Their automatic digital polarimeters are designed to characterise optical active substances in the most demanding quality control and research laboratories.
Ian Laidlaw, Managing Director at Analytik commented: "The competition that can even approach the H532 with respect to accuracy can only achieve it within the range of ±1°. The H532 achieves the same level of accuracy across the full measurement range of ±89°. This is an exceptional instrument, recommended also by PerkinElmer Inc, a global technology leader in multi-vendor laboratory services, software and informatics."
MORE INFO. 114 New Digital Economy Polarimeter
Krüss are very proud of their Polarimeter P8000 because it’s the fastest polarimeter worldwide. Krüss developed a high-speed measurement that reduces measuring time of samples to only 1 second irrespective of the angle of the sample. Compared to other polarimeters, much time is saved during the measuring process.
The P3000 is an economy version of the P8000 and operates just as fast as its big brother. An intuitive touch screen with basic functions has been implemented as well. Measuring results are shown either in optical rotation or in the international sugar scale. Data can be exported to a printer via an RS-232 interface. For industries, i.e. the sugar industry, which don’t need more than 2 digits after the decimal point and perform standardised measuring, the P3000 is excellent value for money.
MORE INFO. 115 ADVERTORIAL New OPTi+ Refractometer Provides Wide Ranging Measurement Capability
The new OPTi+ series of digital hand held refractometers launched by Bellingham + Stanley extends the measuring range of the successful half Brix OPTi models launched in 2011. Covering the complete Brix range, a number of scale derivatives are available making the OPTi+ a perfect instrument for a wide range of applications, whether measurement is required in the field or as a support instrument within the factory or lab.
Bellingham + Stanley has combined 95-years of experience with latest design innovation to produce the OPTi and OPTi+ models. Injection molded stainless steel has been specifically chosen for the sample dish material not only for reasons of optical rigidity but also to facilitate rapid temperature stabilisation that when combined with product specific temperature compensation, helps to ensure reliable results no matter what the sample or environmental conditions.
New software has been also developed for the OPTi+ not only to improve the overall measurement performance but also to enhance the user experience by offering a number of special features such as the unique “AG verification mode” that allows the use of long-life non sucrose based certified reference materials to check calibration as well as touch-of-a-button temperature display in either Celsius or Fahrenheit.
All OPTi and new OPTi+ refractometers are supplied with a traceable Certificate of Calibration as standard.
MORE INFO. 116 MORE INFO. 117
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