The invention relates to a method for producing polyglycerol esters of polycarboxylic acids esterified with oxobutanol, especially mono- or polyvalent polyglycerol esters of polycarboxylic acids esterified with 4-oxo-4-(C.sub.1-C.sub.5-alkoxy)-2-butanol or with 4-oxo-4-(hydroxy-C.sub.3-C.sub.5-alkoxy)-2-butanol, as well as the products thus obtained and their use.

The invention relates to a method for producing polyglycerol esters of polycarboxylic acids esterified with oxobutanol, especially mono- or polyvalent polyglycerol esters of polycarboxylic acids esterified with 4-oxo-4-(C.sub.1-C.sub.5-alkoxy)-2-butanol or with 4-oxo-4-(hydroxy-C.sub.3-C.sub.5-alkoxy)-2-butanol, as well as the products thus obtained and their use.

Disclosed are compositions and methods for inactivating one or more enzymes in a biological sample.

Disclosed are compositions and methods for inactivating one or more enzymes in a biological sample.

Disclosed are compositions and methods for inactivating one or more enzymes in a biological sample.

Disclosed are compositions and methods for inactivating one or more enzymes in a biological sample.

A process for preparing azelaic acid is disclosed. In particular, the process for preparing azelaic acid is an ozone free process. The process for preparing azelaic acid comprises a step of decarboxylation of tetra-carboxylic acid in the presence of a organic sulfonic acid.

A process for preparing azelaic acid is disclosed. In particular, the process for preparing azelaic acid is an ozone free process. The process for preparing azelaic acid comprises a step of decarboxylation of tetra-carboxylic acid in the presence of a organic sulfonic acid.

A two-stage process produces tetraalkyl 1,2,3,4-butanetetracarboxylates having alkyl groups with 1 to 6 carbon atoms starting from tetrahydrophthalic anhydride (THPA). The process starts with an oxidation of tetrahydrophthalic anhydride (THPA), followed by a subsequent esterification of the resulting 1,2,3,4-butanetetracarboxylic acid with an alcohol having 1 to 6 carbon atoms.

A two-stage process produces tetraalkyl 1,2,3,4-butanetetracarboxylates having alkyl groups with 1 to 6 carbon atoms starting from tetrahydrophthalic anhydride (THPA). The process starts with an oxidation of tetrahydrophthalic anhydride (THPA), followed by a subsequent esterification of the resulting 1,2,3,4-butanetetracarboxylic acid with an alcohol having 1 to 6 carbon atoms.