Comparison of structured adsorbents for theadsorptive isolation of food ingredients from largestreams

We present guidelines for the configuration of industrial scale chromatographic separationof small molecules. We compared the performance of different axial packed beds, chan-neled monoliths and a continuous monolith assuming silica as base material. The calculatedmass transfer rates were used to calculate the height of a theoretical plate (HETP...

Synergistic process design: Reducing drying energy consumption by optimal adsorbent selection

This work analyzes the synergy between two complementary unit operations - adsorbent dehumidification and drying - and presents a mixed integer nonlinear programming approach to optimize energy performance in a two-stage system. Combined with active constraint analysis, the adsorbent properties that promote energy performance are derived....

Gas sensing with AlGaN/GaN 2DEG channels

AlGaN/GaN shows great promise as a generic platform for (bio-)chemical sensing because of its robustness and intrinsic sensitivity to surface charge or dipoles. Here, we employ the two-dimensional electron gas (2DEG) formed at the interface of AlGaN/GaN layers grown on Si substrates for the ultra-sensitive detection of NOx. In the presence of...

Theoretical investigation of van der Waals forces between solid surfaces at nanoscales

A theoretical investigation of van der Waals forces acting between two solid silicon surfaces at separations from zero to approximately 20 nm is presented. We focused our efforts on the analysis of different factors that can cause deviations from the classical pressure-distance dependence p ∼ 1/D3. It is demonstrated that a layer (oxide or water...

Influencing the selectivity of zeolite Y for triglycine adsorption

In prior work we studied the adsorption of triglycine on zeolite Y under reference conditions. This study aims to solve the question of which adsorbent properties and process conditions influence the adsorption triglycine from an aqueous solution by zeolite Y. Relevant zeolite parameters to study are: the amount of acidic sites (Si/Al2 ratio),...

Sorption and separation of sugars with adsorbents based on reversible chemical interaction

The goal of this work was to enchance the selectivity of the separation of fructose or glucose from carbohydrate mixtures with adsorbents capable of reversible reaction. The experimental data presented demonstrate the feasibility of separating glucose from trans-galacto-oligosaccharides and fructose from fructo-oligosaccharides using resins as...

Evaluation of the intestinal absorption of deoxynivalenol and nivalenol by an in vitro gastrointestinal model, and the binding efficacy of activated carbon and other adsorbent materials

In vitro screening of 14 adsorbent materials, including some commercial products used to detoxify Fusarium-mycotoxins, were tested in the pH range of 3-8 for deoxynivalenol (DON)- and nivalenol (NIV)-binding ability. Only activated carbon showed to be effective with binding capacities of 35.1 μmol and 8.8 μmol DON and NIV/g adsorbent,...

Assessing the zearalenone-binding activity of adsorbent materials during passage through a dynamic in vitro gastrointestinal model

A novel approach is presented herein to study the intestinal absorption of mycotoxins by using a laboratory model that mimics the metabolic processes of the gastrointestinal (GI) tract of healthy pigs. This model was used to evaluate the small-intestinal absorption of zearalenone from contaminated wheat (4.1 mg/kg) and the effectiveness of...

A novel apparatus for countercurrent sorption separation processes using fibrous sorbents

This paper discusses a technical feasibility study on continuous countercurrent sorption equipment using mechanically transported fibrous sorbent materials such as fiber beds and open-cell foam. A pilot unit was developed and tested and the apparatus performed adequately. Under the conditions applied, the separation efficiency of the appartus is...

Isolation of α-amylase on crosslinked starch

The isolation and purification of α-amylase from an industrial enzyme sample is described using crosslinked starch powder as an affinity adsorbent. The process was studied with regard to the stability of the adsorbent, the stability of the enzyme, and the capacity of the adsorbent for the enzyme. The adsorbent was used in a repeated adsorption...