Food materials structuring process homogenization

First layers of a 10-pm thin monolithic sihca gel structure with 1- to 2- am macropores and 3- to 4-nm mesopores were manufactured by hydrolytic polycondensation of hquid alkoxysiloxane films coated on glass substrates. Separations were performed for steroids, pesticides, dyestuffs, amino acids, pharmaceutically active ingredients, phenols, and plasticizers [3,4]. Besides this commercially available monohthic UTLC product, which resulted from these studies and was used for several hyphenations to MS [5-10], the sol-gel synthesis process was further improved to provide a high homogeneity, reproducibihty, and mechanical stability of the layer material. Optimized synthesis is still used to build up monolithic stationary phases with new characteristics, and synthetic dyes and food dyes were separated on a 100-pm thin layer [11,12]. 

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