Methods of purifying crude 4-hydroxyacetophenone using one or more solvents as well as products comprising or consisting of crystallized 4-hydroxyacetophenone and one, two or more solvent(s). The products may be obtained or obtainable from the methods for purifying crude 4-hydroxyacetophenone.

Methods of purifying crude 4-hydroxyacetophenone using one or more solvents as well as products comprising or consisting of crystallized 4-hydroxyacetophenone and one, two or more solvent(s). The products may be obtained or obtainable from the methods for purifying crude 4-hydroxyacetophenone.

The disclosure provides a method for separating eighteen components in a traditional Chinese medicine composition, including: (1) preparing the traditional Chinese medicine composition into a total extract of the traditional Chinese medicine composition, separating by resin through sequentially eluting with water, 10% ethanol and 30% ethanol, and collecting the 30% ethanol eluate to obtain a 30% ethanol extract; (2) adding the 30% ethanol extract to a reverse phase silica gel ODS-AQ-HG, and separating in a medium pressure separation column to obtain differently numbered elution dry pastes; (3) dissolving the differently numbered elution dry paste with 30% methanol as a solvent, and passing the solution through a 0.45 m microporous membrane, carrying out a primary separation by high performance liquid chromatography and collecting chromatographic peaks with different retention times, and further purifying by high performance liquid chromatography; finally obtaining the components of eighteen components.

The disclosure provides a method for separating eighteen components in a traditional Chinese medicine composition, including: (1) preparing the traditional Chinese medicine composition into a total extract of the traditional Chinese medicine composition, separating by resin through sequentially eluting with water, 10% ethanol and 30% ethanol, and collecting the 30% ethanol eluate to obtain a 30% ethanol extract; (2) adding the 30% ethanol extract to a reverse phase silica gel ODS-AQ-HG, and separating in a medium pressure separation column to obtain differently numbered elution dry pastes; (3) dissolving the differently numbered elution dry paste with 30% methanol as a solvent, and passing the solution through a 0.45 m microporous membrane, carrying out a primary separation by high performance liquid chromatography and collecting chromatographic peaks with different retention times, and further purifying by high performance liquid chromatography; finally obtaining the components of eighteen components.

A process of obtaining a purified geometric isomer of an unsaturated macrocyclic compound is disclosed herein. The process is effected by contacting an ion exchange medium comprising silver ions with a mixture comprising at least one geometric isomer of the unsaturated macrocyclic compound, to thereby obtain at least one fraction comprising the purified geometric isomer of the macrocyclic compound. A system configured for performing the process is also disclosed.

A process of obtaining a purified geometric isomer of an unsaturated macrocyclic compound is disclosed herein. The process is effected by contacting an ion exchange medium comprising silver ions with a mixture comprising at least one geometric isomer of the unsaturated macrocyclic compound, to thereby obtain at least one fraction comprising the purified geometric isomer of the macrocyclic compound. A system configured for performing the process is also disclosed.

It is an object of the present invention to provide a novel means for purifying bisacurone from turmeric at low costs and in a high concentration.

A method of producing a bisacurone-containing turmeric extract, comprising a stepwise extraction step of using a plurality of extraction solvents each having different polarity by combining them with one another in a predetermined order.

It is an object of the present invention to provide a novel means for purifying bisacurone from turmeric at low costs and in a high concentration.

A method of producing a bisacurone-containing turmeric extract, comprising a stepwise extraction step of using a plurality of extraction solvents each having different polarity by combining them with one another in a predetermined order.

The present disclosure is directed to methods of purifying solvents. The purified solvents can be used for cleaning a semiconductor substrate in a multistep semiconductor manufacturing process.

The present disclosure is directed to methods of purifying solvents. The purified solvents can be used for cleaning a semiconductor substrate in a multistep semiconductor manufacturing process.