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GP/SEC Characterizes Complex Food Ingredients  The Viscotek TDAmax GPC/SEC system is an information-rich, time-efficient analytical solution for comprehensively characterizing complex food ingredients and additives based on polysaccharides. The fully integrated triple detector array includes a low-angle light scattering detector (LALS), four-capillary differential viscometer, and a refractive index detector.
Using GPC/SEC, passing a sample through a series of carefully specified packed columns separates it on the basis of hydrodynamic size. Single or multiple detectors analyze the resulting fractions. The design and selection of the detectors dictates how much information can be gathered during each experiment. The detector array provides absolute molecular weight without extrapolation or correction, molecular size, and intrinsic viscosity, as well as information on structure, conformation, aggregation and branching. Adding an additional UV-Vis detector creates an integrated tetra detector array suited for copolymer characterization.
The performance characteristics of various food ingredients depend on their molecular weight and structure. Low molecular weight fractions in some ingredients may even be harmful to human health. Therefore, confirming that these have been removed is important. Many food ingredients have large molecular sizes, however, and this can present a challenge in accurately determining molecular weight distribution. Research detailed in the paper Alginates, Chitosanes and Xanthans: Characterization of Food Ingredients by GPC/SEC with Triple Detection , published in AgroFOOD Industry Hi-tech (Vol 20, No. 4, 2009) shows that the TDAmax can meet this analytical challenge and provides accurate and detailed information.
For further details of the TDAmax and other Viscotek products visit www.viscotek.com
Malvern Instruments Inc.*
117 Flanders Road
Westborough MA 01581
Phone: 508-768-6400
Fax: 508-768-6403
http://www.malvern.com
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