Publication

Enzymic ester hydrolysis in liquid two-phase systems for the preparation of L-phenylalanine

Albert Renken
1988
Journal Articles

Abstract

L-Phenylalanine was produced from phenylalanine Pr esters by chymotrypsin in 2-phase systems (org. phase using iso-Bu Me ketone and aq. phase). Control of pH during the enzymic reaction was crit. The reaction was carried out in a batch fermentor or a fixed-bed reactor. It was also possible to use chymotrypsin immobilized in 3-aminopropyltriethoxysilane and(or) glutaraldehyde-activated silica gel. [on SciFinder (R)]

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Albert Renken
1988
Journal Articles

Abstract

Official source

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Phase transition

In chemistry, thermodynamics, and other related fields, a phase transition (or phase change) is the physical process of transition between one state of a medium and another. Commonly the term is used to refer to changes among the basic states of matter: solid, liquid, and gas, and in rare cases, plasma. A phase of a thermodynamic system and the states of matter have uniform physical properties. During a phase transition of a given medium, certain properties of the medium change as a result of the change of external conditions, such as temperature or pressure.

Phase (matter)

In the physical sciences, a phase is a region of material that is chemically uniform, physically distinct, and (often) mechanically separable. In a system consisting of ice and water in a glass jar, the ice cubes are one phase, the water is a second phase, and the humid air is a third phase over the ice and water. The glass of the jar is another separate phase. (See .) More precisely, a phase is a region of space (a thermodynamic system), throughout which all physical properties of a material are essentially uniform.

Phase diagram

A phase diagram in physical chemistry, engineering, mineralogy, and materials science is a type of chart used to show conditions (pressure, temperature, volume, etc.) at which thermodynamically distinct phases (such as solid, liquid or gaseous states) occur and coexist at equilibrium. Common components of a phase diagram are lines of equilibrium or phase boundaries, which refer to lines that mark conditions under which multiple phases can coexist at equilibrium. Phase transitions occur along lines of equilibrium.

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