Antibiotics For Cell Culture

The most commonly used antibiotics in cell culture are:

• Penicillin-Streptomycin: A broad-spectrum antibiotic combination that targets both Gram-positive and Gram-negative bacteria.
• Amphotericin B: An antifungal antibiotic used to prevent fungal contamination.
• Gentamicin: An aminoglycoside antibiotic that helps control bacterial contamination.

While antibiotics can be helpful, they are not always necessary. Using proper sterile techniques, bacterial contamination can be minimized. 

Researchers often culture cells without antibiotics to avoid masking contamination and to maintain the natural microbial environment, which can affect cell metabolism or drug sensitivity.

Yes, certain antibiotics can have side effects on cell growth, metabolism, and overall cell health. For example, penicillin or streptomycin can sometimes interfere with cell proliferation or induce cell stress. It is essential to carefully monitor the impact of antibiotics on cells, especially when long-term culture is involved.

Use antibiotics when:

• Starting new cultures from biological materials (such as primary cells or tissue samples) that may have been exposed to bacteria or fungi.
• Performing experiments in non-sterile conditions or working with multiple samples and cell lines
• Managing cultures that are particularly sensitive to contamination or prone to infection.

Avoid antibiotics if the goal is to study natural microbial effects or when contamination risk is minimal.

The choice of antibiotics depends on the type of culture you are working with and the specific risks involved:

• Penicillin-Streptomycin is a general-purpose solution for most cell types.
• Amphotericin B should be used if fungal contamination is a concern.
• Gentamicin is useful for cultures more susceptible to Gram-negative bacterial contamination.
• Always check the susceptibility of your specific cell line to different antibiotics to avoid unnecessary antibiotic use.

The concentrations of antibiotics you use will depend on the specific product. For example, Penicillin/Streptomycin is commonly used at 100 Units/mL Penicillin and 100 µg/mL Streptomycin, whereas Gentamicin is often used at concentrations of 50–100 µg/mL. For precise guidelines, it’s important to consult the product page for each antibiotic, where detailed concentration recommendations are listed based on its specific use and cell type.

• Storage conditions for antibiotics will vary depending on the antibiotic.
• Solutions containing Amphotericin B, Penicillin, and/or Streptomycin should be stored at -20 °C.
• Gentamicin solutions can be stored at room temperature.
• Kanamycin and Ampicillin Ready-Made Solutions should be stored at -20 °C.

Amphotericin B is an antimycotic agent that prevents the growth of fungi. It acts by causing an increase in fungal plasma membrane permeability. Refer to the Amphotericin B product page for more information.

Penicillin/Streptomycin solution is one of the most widely used antibiotic mixtures used in cell culture. Amphotericin B, an antifungal agent, can also be added to product an Amphotericin B/Penicillin/Streptomycin Mix.

Storage conditions for antibiotics will vary depending on the antibiotic.

• Solutions containing Amphotericin B, Penicillin, and/or Streptomycin should be stored at -20 °C.
• Gentamicin solutions can be stored at room temperature.
• Kanamycin and Ampicillin Ready-Made Solutions should be stored at -20 °C.

Avoid light exposure to maintain antibiotic stability and prepare solutions in sterile conditions to prevent contamination. Minimize repeated freeze-thaw cycles as it will significantly decrease the potency of the antibiotic, potentially rendering it ineffective.