We describe the general aspects of ion chromatography and how on-line counted ion-exchange techniques can be utilized to determine pyruvic and lactic acids in plasma and vanillymandelic acid in urine. Pyruvate and lactate are extracted from deproteinized plasma by use of an ion-exclusion resin. After elution from the resin, the plasma extract is chromatographed on an anion-exchange column, with...

Cation-exchange fast protein liquid chromatography – electrothermal atomic absorption spectrometry (FPLC – ETAAS) was applied for the speciation of trace amounts of aluminium. An aqueous 8 mol dm–3 NH4NO3 linear gradient elution in 10 minutes enabled separation of positively charged monomeric aluminium species in aqueous solution. Separated aluminium species were collected in 0.5 cm3 fractions ...

The most commonly-used test for determining the serum concentration of thyroid hormones is the protein-bound iodine analysis (PBI) which measures the serum's entire organic and some inorganic iodide concentration. Since it is desired to measure only that portion of the serum iodine which is in the thyroxine molecule, this test may be misleading. The method of PBI determination rou tinely used i...

We describe a "high-performance" liquid-chromatographic procedure for measuring 3-methoxy-4-hydroxymandelic acid (vanillylmandelic acid) in urine. The compound is quantitatively extracted from urine by use of an automated system, including an anion-exchange resin. After elution from the resin and concentration by air drying, the urine extract is chromatographed on an octyl silica column, with u...

Transparent superhydrophobic materials can be used in car glass, curtain walls, mobile phone screens, and other items. However, the hydrophobicity, transparency, abrasion resistance of transparent coating are mutually restricted, it is difficult to prepare with good performance. In this article, taking screen as research object, inorganic silicon resin crystal main material, organic binder hard...

This research aimed to evaluate the thermal properties of new formulations of phase change materials (PCMs)-epoxy composites, containing a thickening agent and a thermally conductive phase. The composite specimens produced consisted of composites fabricated using (a) inorganic PCMs (hydrated salts), epoxy resins and aluminum particulates or (b) organic PCM (paraffin), epoxy resins, and copper p...

The aim of this study was to evaluate the effect of additional polymethyl methacrylate (PMMA) fillers on the physical properties of experimental resin composites. PMMA particles (d=30 µm) were added to an experimental methacrylate-based resin composite in five concentrations of 0, 2.0, 4.8, 9.1, and 23.1 wt%. Properties such as contact angle, water sorption and compressive strength were measure...

Thorough removal of silicic acid from treated water, as a water pretreatment procedure, is essential for the prevention silica deposits on anion exchange resins and reverse osmosis membranes. In this study, thorough was achieved using Tiron (1,2-dihydroxy-3,5-benzendisulfonate) combined resin. column experiment, it confirmed that could be removed below detection limit molybdenum-blue methods. T...

Concern has been raised about the bonding of restorative procedures to an erosive lesion, given the change in organic and inorganic composition and structure of this substrate. This in vitro study evaluated the effect of erosive drinks and an enzyme inhibitor (2% chlorhexidine digluconate - 2% CHX) on bond strength to dentin. Sixty sound human third molars were selected, and the occlusal enamel...