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At least 361 records · Page 20Linked to original sources
PubMed1991

Solubilization of rat kidney lysosomes in reversed micelles of aerosol OT in octane.

Intact lysosomes from rat kidneys were solubilized in the ternary system: surfactant (Aerosol OT)-buffer-organic solvent. According to data of laser light-scattering analysis and kinetic experiments with the lysosomal marker enzyme, N-acetyl-beta-D-hexosaminidase (EC 3.2.1.30), the solubilization of lysosomes in this system resulted in the destruction of the lysosomes and the entrapping of their components in reversed micelles.

Animals↗
PubMed1995

High-pressure stabilization of alpha-chymotrypsin entrapped in reversed micelles of aerosol OT in octane against thermal inactivation.

alpha-Chymotrypsin (CT) solubilized in reversed micelles of sodium bis-(2-ethylhexyl)-sulfosuccinate (AOT) undergoes thermal inactivation and the enzyme stability decreases significantly when temperature increases (25-40 degrees C). The half-life of CT in micelles shows a bell-shaped dependence on the degree of hydration of AOT (wo) analogous to the previously obtained dependence on wo for the enzyme activity. The optima of catalytic activity and thermal stability have been observed under conditions where the diameter of the inner aqueous cavity of the micelle is close to the size of the enzyme molecule (wo = 10). Application of high hydrostatic pressure in the range of 1-1500 atm (bar) stabilizes CT against thermal inactivation at all hydration degrees (wo) from 7 to 20; the stabilization effect is most pronounced under the experimental conditions being far from the optimum for catalytic activity.

Animals↗
PubMed2001

Template-directed C-H insertion: synthesis of the dioxabicyclo[3.2.1]octane core of the zaragozic acids.

[reaction: see text] The preparation of (+/-)-24, a model for the core of the zaragozic acids, is reported. The pivotal reaction in this endeavor is the dirhodium(II)-catalyzed intramolecular C-H bond insertion of 2-diazoacetyl-1,3-dioxane 4, a transformation which generates four of the six stereocenters present in the core structure. A novel method for the diastereoselective synthesis of pyruvic acid acetals was also developed and employed in the preparation of 4 from xylitol derivative 7.

Bridged Bicyclo Compounds, Heterocyclic↗