Escherichia coli
 

Escherichia coli

The culture media products from Ensenmi offer distinct advantages in the development and application of Escherichia coli fermentation. We can tailor specific fermentation culture media products to meet customer needs by considering differences in strains and fermentation processes. Below, we summarize the fermentation durations of Escherichia coli for different target products, their nitrogen requirements, and the key advantages of Ensenmi fermentation culture media products.

Fermentation Duration for Different Target Products

Recombinant protein

Insulin production: 20-24 h

Growth hormone production: 24-36 h

Interferon production: 36-48 h

Enzyme

Cellulase production: 24-48 h

Protease production: 12-36 h

Restriction endonuclease production: 12-24 h

When producing the above target products by Escherichia coli fermentation, the overall fermentation cycle is typically 0.5-2 days. This requires a rapid and reliable nitrogen supply, making our yeast extract products an ideal nitrogen source supplement for these applications.

Nitrogen Requirements of Escherichia coli

During the production of recombinant protein production such as insulin, growth hormone, and interferon, E. coli requires a sufficient supply of organic nitrogen in the early growth phase to rapidly accumulate biomass. In the later expression phase, a moderate level of organic nitrogen is still needed to support metabolism, while excessive nitrogen may increase by-product formation.

Furthermore, for high-purity pharmaceutical production, E. coli generally prefers well-defined, batch-consistent organic nitrogen sources. Therefore, pharmaceutical-grade processes often favor standardized yeast-derived products with low impurities, low endotoxin risk, and minimal batch-to-batch variation. Depending on the fermentation duration, yeast extract, or yeast peptone can be selected as the organic nitrogen source.

In enzyme production, product purity requirements are generally lower than in pharmaceutical applications. As a result, excluding price considerations, inactive yeast-derived products are usually more readily accepted.

Advantages of Ensenmi Culture Media Products 

The B vitamins and nucleotide precursors contained in Ensenmi culture media products support the core metabolism of E. coli, promote protein and nucleic acid synthesis, enhance energy metabolism, and help establish high-cell-density cultures more quickly. In addition, E. coli cells can enter a highly active state more rapidly, effectively shortening seed culture time and the adaptation period before main fermentation, ultimately improving productivity per unit time.

Ensenmi culture media products also provide a richer and more batch-stable supply of amino acids and small peptides, which helps maintain coenzyme metabolism, supports transcription and translation, reduces expression fluctuations caused by nutrient limitation, and contributes to higher target yields.