Combined Use of Rheometry and GPC/SEC for Characterising Ionic Polysaccharides
Poster Mar 18, 2015
John Duffy, Bernd Schaefer, Bert Postma
The widespread use of ionic polysaccharides like Hyaluronan, Chitosan and Carrageenan in applications as broad as medical, cosmetics and foods generates a demand for ever more detailed and accurate material characterization. Applications require ever higher material specifications, and business need ever leaner production techniques. Shorter consumer product cycles also put pressure on the development teams. This results in requests for shorter development times and more specific information about the materials used.
Rheology and Size Exclusion Chromatography (SEC/GPC) are both well established methods for the characterization of polysaccharide solutions. SEC targets characterization on a molecular scale whereas rheology offers insights into properties on a more macroscopic scale. Linking the results of independent characterization technologies results in a much more complete picture of the samples under investigation. This poster shows how Rheometry and GPC can be used as complementary tools for characterising the behaviour of polysaccharides in solution.
Using Elemental Analysis For Discrimination Of Pinot Noir Wines From Six Different Districts In An AvaPoster
The determination of geographical origin of wine is gaining increased interest by researchers and federal agencies around the world, partially due to increased fraud with regards to place of origin labelling. For wine, multi-elemental profiling of macro, micro, and trace elements has been proposed for determination of authenticity. Commercial wines from different wineries in 5 different neighborhoods within one AVA show characteristic elemental fingerprints. Macro, micro and trace elements as well as elemental ratios contribute to the observed separation, indicating the involvement of multiple factors and underlying mechanisms, including location and soil composition, elemental uptake by vine and rootstock, viticulture and nutrient management, water sources, and small differences in the different wineries.READ MORE
Fast arsenic speciation analysis of wines and rice with LC-ICP-QQQPoster
This method was designed in response to recent and proposed food standards, both international and national, that limit inorganic arsenic rather than total, organic, or individual arsenic species such as arsenite (AsIII) and arsenate (AsV). Analysis time is 10x faster than the current FDA regulatory method, increasing sample throughput, avoided spectral interferences and dramatically increased sensitivity. Validation data from two laboratories demonstrate the method’s accuracy and reproducibility of both wine and rice matrices in a single analytical batch.READ MORE
Elemental profiles of whiskies allow differentiation by type and region by inductively coupled plasma –optical emission spectroscopy (ICP-OES)Poster
The analysis of the elemental composition of whiskies provides a host of important information including sample origin and understanding how different whiskey styles are caused by processing equipment and raw materials. Preliminary data analysis of the whiskies showed that element compositions could possibly be used to differentiate samples based on age, type, and region.READ MORE