Isoascorbic or erythorbic acid is a stereoisomer of ascorbic acid acting as a preservative against oxidation and decoloration, recently approved for food use also in the European Market. Actually erythorbate is produced by means of a complex and long process after bio-fermentation of dextrose. In order to simplify and improve this process a membrane system was conceived able to induce acid 2-ketogluconic diffusion from fermentation broth directly into methanol where it esterificates. Acid 2-ketogluconic methyl ester is the intermedium for erythorbic acid. The principal problem was to perfectly separate aqua from methanol to avoid saponification instead of esterification.
Spigno, G., Pagella, C., De Faveri, D. M., Innovation in sodium erythorbate production: the use of membrane reactors, <<ANNALI DI CHIMICA>>, 2001; (91): 221-228 [https://hdl.handle.net/10807/231728]
Innovation in sodium erythorbate production: the use of membrane reactors
Spigno, Giorgia;Pagella, Claudio;De Faveri, Dante Marco
2001
Abstract
Isoascorbic or erythorbic acid is a stereoisomer of ascorbic acid acting as a preservative against oxidation and decoloration, recently approved for food use also in the European Market. Actually erythorbate is produced by means of a complex and long process after bio-fermentation of dextrose. In order to simplify and improve this process a membrane system was conceived able to induce acid 2-ketogluconic diffusion from fermentation broth directly into methanol where it esterificates. Acid 2-ketogluconic methyl ester is the intermedium for erythorbic acid. The principal problem was to perfectly separate aqua from methanol to avoid saponification instead of esterification.
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