Synthesis of L-tryptophan by immobilized Escherichia coli cells
نویسندگان
چکیده
منابع مشابه
l- tryptophan production by whole cells of escherichia coli based on iranian sugar beet molasses
conclusions our present study shows that sugar beet molasses is a source of plp and l-ser; and hence, suggests the general application of the approach to produce l-trp more economically. results consequently, the potassium phosphate buffer system was considered as the suitably buffered reaction medium. the concentration of l-trp produced in reaction medium was 0.3 mm and 0.12 mm for glucose and...
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For L-aspartic acid biosynthesis, high production cells of Escherichia coli mutant B-715 and P1 were immobilized in chitosan gel using a technique developed in our laboratory. The immobilization process reduced initial activity of the intact cells, however, the biocatalyst produced was very stabile for long-term use in multi-repeated batch or continuous processes. Temperature influence on the c...
متن کاملModification of tryptophan transport system and its impact on production of L-tryptophan in Escherichia coli.
The production of L-tryptophan through chemical synthesis, direct fermentation, bioconversion and enzymatic conversion has been reported. However, the role of transport system for aromatic amino acids in L-tryptophan producing strains has not been fully explored. In this study, the fact was revealed that L-tryptophan production and cell growth were affected by the modification of transport syst...
متن کاملL-tryptophan production by Escherichia coli in the presence of Iranian cane molasses
The essential amino acid L-tryptophan (Trp) has importance as a pharmaceutical agent, especially in neuro-medicine. It is also added to feed products as a food fortifier. Furthermore, application of Trp is widespread in biotechnology. Trp is produced by a condensation reaction between indole and Lserine, which is catalyzed by bacterial tryptophanase activity. In this study, we have investigated...
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background l-tryptophan is an important ingredient in medicines, especially in neuromedicines such as antidepressants. many commercial processes employ various microorganisms with high tryptophan synthase activity to produce l-tryptophan from indole and l-serine, but these processes are very costly due to the costs of precursors, especially l-serine. objectives for this reason, we studied the a...
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ژورنال
عنوان ژورنال: European Journal of Applied Microbiology and Biotechnology
سال: 1979
ISSN: 0171-1741,1432-0614
DOI: 10.1007/bf00499853