Ursolic acid inSorbus aucuparia
chromatographed on A1203, a mixture of neutral substances was obtained with the absorption bands in the IR spectrum characteristic for anhydrides (1805, 1734, and 1000 cm" 1) [3], which disappeared after the saponification of this mixture with 0.5 N ethanolic KOH at 40" C (figure, b). Pure abietic acid was extracted from the saponification product. Under the conditions mentioned, esters of the resin acids (if they are present in the mixture) are not saponified and therefore the acid was produced by the saponification of the anhydride.
Triterpene, IX. Über die Triterpene aus der Rinde von Sambucus nigra L. und die Darstellung von 3-epi-Ursolsäure
Die Isolierung von Ursolsaure (als Methylester), Betulin, α-Amyrin, β-Sitosterin, Cerylalkohol und n-Heptacosan aus der Rinde von S. nigra L. sowie die Darstellung von 3-epi-Ursolsaure und einigen Derivaten werden beschrieben.
Adsorption of immunoglobulin Y in supermacroporous continuous cryogel with immobilized Cu(2+) ions.
The influence of temperature, pH and ionic strength on the adsorption of Immunoglobulin Y (IgY) in IDA-Cu(2+) cryogel system was studied by batch equilibrium measurements. The adsorptive equilibrium data were obtained at 17 and 27°C, pH 5.0 and 6.5, and at ionic strength of 50 and 200mmolL(-1) NaCl. Langmuir, Freundlich and Langmuir-Freundlich models were fitted to equilibrium data, while the enthalpy of adsorption of IgY in IDA-Cu(2+) cryogel system was calculated through Van't Hoff analysis. The binding of IgY on cryogel was stronger at 27°C and lowest pH and ionic strength values, with apparent maximum adsorption capacity of 27mgg(-1). The adsorption of protein in the resin was spontaneous in all analyzed cases. The results provide valuable information to enable the improvement of IgY purification processes.