Provided is a method for resolving an optical isomer from a racemate by using supercritical fluid extraction technology. The method is mainly applied to the separation of a product obtained after enzymatic resolution. Taking a preparation process of D-pantolactone as an example, the key point is to separate D-pantolactone and L-pantolactone from an enzymatic resolution liquid by means of supercritical fluid extraction.

Disclosed is a method for resolving an optical isomer from a racemate by means of electrodialysis. Specifically, an electrodialysis technique is used in an enzymatic resolution process, mainly in the separation of products after enzymatic resolution. Taking a preparation process for D-pantolactone as an example, the key point is that D-pantoic acid and L-pantolactone are separated from an enzymatic resolution solution by means of an electrodialysis method, which replaces the existing organic solvent extraction method. The process method is simple and easy to operate, has a high yield of D-pantoic acid of a good purity, greatly reduces the usage amount of an organic solvent, reduces production costs and is environmentally friendly, such that the working environment of workers can be improved to a great extent, and the operation safety index is improved.

In various embodiments methods of preparing hydroxybutyryl 3-hydroxybutyrate and related compounds are provided along with methods of use thereof.

In various embodiments methods of preparing hydroxybutyryl 3-hydroxybutyrate and related compounds are provided along with methods of use thereof.

In various embodiments methods of preparing hydroxybutyryl 3-hydroxybutyrate and related compounds are provided along with methods of use thereof.

The present disclosure relates, at least in part, to the production of delta-lactones from fatty acid substrates via a batch fermentation method in an engineered microbe using a recombinant cytochrome P450 monooxygenase.