NEW TLC VISUALISER από την CAMAG

Κυκλοφόρισε ο καινούργιος TLC VISUALIZER από την CAMAG.

Ένα πολύ καλό εργαλείο για TLC χρωματογραφία.

Τα χαρακτηριστικά του :

Images of highest quality ever in the field

• Powerful linear response high-res CCD camera
• Newly designed multi wavelength illumination unit
• Outstanding CAMAG software features
• Low noise images for best results in qualitative and quantitative chromatogram evaluation

The visual impression provided by a TLC plate showing all samples and standards side-by-side is one of the most convincing arguments to employ Thin-Layer Chromatography. No other chromatographic technique can directly express the result as a color image and make it available for visual evaluation.

A state-of-the-art documentation system is needed to reproducibly acquire and digitally preserve an impression at different wavelengths.

Key features of TLC VISUALIZER documentation and evaluation system:

• Ergonomic, state of the art design
• Enhanced illumination unit: visible/white light, UV254, UV366, visible/white transmitted light.
• Powerful high-resolution 12 bit CCD digital camera with outstanding linearity:
  12 bit = 4095 linear intensity levels.
• Easy and intuitive handling with CAMAG software winCATS
• Fast image transfer rates below 1s
• Automatic image optimization
• Spot amplification tool to locate even smallest fractions on a TLC plate
• Optional Professional Image Enhancement: Automatic background correction to increase image sensitivity
• Optional Image Comparison Viewer for visual comparison of multiple samples on the same screen
• Quantitative evaluation of digitized images with optional VideoScan software
• TLC VISUALIZER and winCATS software compliant with GMP/GLP; IQ/OQ qualification and 21CFR11 are provided.

To προσπέκτους είναι διαθέσημο εδώ: http://www.camag.com/cgi-bin/camag/account/user.pl?file=www.camag.com/downloads/protected/brochures/TLC-Visualizer.pdf

Classification and individualisation of black ballpoint pen inks using principal component analysis of UV–vis absorption spectra

Στο καινούργιο τευχος του Journal of Forensic Sciences International (Volume 174, Issue 1, 15 January 2008, Pages 16-25 ), οι Craig D. Adam, Sarah L. Sherratt & Vladimir L. Zholobenko παρουσιάζουν μια εργασία με τίτλο: "Classification and individualisation of black ballpoint pen inks using principal component analysis of UV–vis absorption spectra ".

In the new Issue of Journal of Forensic Sciences International (Volume 174, Issue 1, 15 January 2008, Pages 16-25 ), οι Craig D. Adam, Sarah L. Sherratt and Vladimir L. Zholobenko Meenakshi Mahajan & S.P. Arya present a paper titled: "Classification and individualisation of black ballpoint pen inks using principal component analysis of UV–vis absorption spectra Tape".

Περίληψη/Abstract: The technique of principal component analysis has been applied to the UV–vis spectra of inks obtained from a wide range of black ballpoint pens available in the UK market. Both the pen ink and material extracted from the ink line on paper have been examined. Here, principal component analysis characterised each spectrum within a group through the numerical loadings attached to the first few principal components. Analysis of the spectra from multiple measurements on the same brand of pen showed excellent reproducibility and clear discrimination between inks that was supported by statistical analysis. Indeed it was possible to discriminate between the pen ink and the ink line from all brands examined in this way, suggesting that the solvent extraction process may have an influence on these results. For the complete set of 25 pens, interpretation of the loadings for the first few principal components showed that both the pen inks and the extracted ink lines may be classified in an objective manner and in agreement with the results of parallel thin layer chromatography studies. Within each class almost all inks could be individualised. Further work has shown that principal component analysis may be used to identify a particular ink from a database of reference UV–vis spectra and a strategy for developing this approach is suggested.

Forensic Science International: http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6T6W-4NF2NHG-1&_user=10&_coverDate=01%2F15%2F2008&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=522be83d3ff75cde594bc4371ada28f4