Mammalian Cell Culture Basics Support—Getting Started
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Yes. Store animal sera at –5 to –20°C. Store media at 2 to 8°C; use within recommended shelf life. Store complete media (supplemented) at 2 to 8°C, and for complete medium the recommended shelf life is 2 to 4weeks. Additionally, minimize exposure of sera and media to light.
The regulations and recommendations for biosafety in the United States are contained in the document Biosafety in Microbiological and Biomedical Laboratories, prepared by the Centers for Disease Control (CDC) and the National Institutes of Health (NIH), and published by the U.S. Department of Health and Human Services. The document defines four ascending levels of containment, referred to as biosafety levels 1 through 4, and describes the microbiological practices, safety equipment, and facility safeguards for the corresponding level of risk associated with handling a particular agent.
Biosafety Level 1 (BSL-1): BSL-1 is the basic level of protection common to most research and clinical laboratories, and is appropriate for agents that are not known to cause disease in normal, healthy humans.
Biosafety Level 2 (BSL-2): BSL-2 is appropriate for moderate-risk agents known to cause human disease of varying severity by ingestion or through percutaneous or mucous membrane exposure. Most cell culture labs should be at least BSL-2, but the exact requirements depend upon the cell line used and the type of work conducted.
Biosafety Level 3 (BSL-3): BSL-3 is appropriate for indigenous or exotic agents with a known potential for aerosol transmission, and for agents that may cause serious and potentially lethal infections.
Biosafety Level 4 (BSL-4): BSL-4 is appropriate for exotic agents that pose a high individual risk of life-threatening disease by infectious aerosols and for which no treatment is available. These agents are restricted to high containment laboratories.
For more information about the biosafety level guidelines, refer to Biosafety in Microbiological and Biomedical Laboratories, 5th Edition, which is available for download at http://www.cdc.gov/biosafety/publications/bmbl5/index.htm.
Most normal mammalian cell lines grow well at pH 7.4, and there is very little variability among different cell strains. While most researchers usually use 5–7% CO2 in air, 4–10% CO2 is common for most cell culture experiments. Read more about buffering conditions here.
Aseptic technique, designed to provide a barrier between the microrganisms in the environment and the sterile cell culture, depends upon a set of procedures to reduce the probability of contamination from these sources. The elements of aseptic technique are a sterile work area, good personal hygiene, sterile reagents and media, and sterile handling. Click here to read more about aseptic technique or view our checklist.
There are two basic systems for growing cells in culture, as monolayers on an artificial substrate (i.e., adherent culture) or free-floating in the culture medium (suspension culture). The majority of the cells derived from vertebrates, with the exception of hematopoietic cell lines and a few others, are anchorage-dependent and have to be cultured on a suitable substrate that is specifically treated to allow cell adhesion and spreading (i.e., tissue-culture treated). However, many cell lines can also be adapted for suspension culture. Similarly, most of the commercially available insect cell lines grow well in monolayer or suspension culture.
Cells that are cultured in suspension can be maintained in culture flasks that are not tissue-culture treated, but as the culture volume to surface area is increased beyond which adequate gas exchange is hindered (usually 0.2–0.5 mL/cm2), the medium requires agitation. This agitation is usually achieved with a magnetic stirrer or rotating spinner flasks.
Find a comparison chart between the two here.
You can find a protocol on our web site. In the main search box type "Media Preparation from Powder and Concentrates" and hit Enter or click Search. This should take you to a detailed protocol page.
Gibco™ cell culture media is formulated using water meeting all USP monograph requirements for Water For Injection.
No, you do not need to adjust the pH of the liquid media when you receive it. It should be in the correct pH range for use. After you add your supplements (if needed), you can check the pH again and adjust if necessary. However, usually it does not change significantly. It would be necessary to pH media that you make up yourself from a powder, with the exception of AGT™ media where pH and osmolality are auto-adjusted.
This water is purified by distillation or by reverse osmosis. It contains no added substances. It cannot be used for vivo injection because it is not packaged in a single-dose glass or plastic container to protect the water from contamination. It is intended for use as a solvent for the preparation of parenteral solutions, such as media and reagents.
These two products are the same water. However, Water for Injection (WFI) for Cell Culture has undergone more testing, including conductivity measurement as well as testing for nitrate and total organic carbon.
Cell Culture Bags and PE Film
The commercially available film is a very clear, multi-layered, single web film with a polyethylene contact surface that can be made into a wide range of bag sizes (250 mL to 1,000L). In addition, the film is a market leader with exceptional gas barrier properties and very low extractable and leachable results. Click here to read more about the PE Film specifications.
Each bag size will arrive in a specific heavyweight corrugated box designed for shipment:
5 L: 12” x 14.25” x 5.5”
10 L: 13” x 23.5” x 6.125”
20 L: 15” x 24” x 6.125”
Yes. Although we feel that the PE film exceeds many of the technical properties of the other available films, we will continue to offer and support our other currently available films through custom orders.
Almost all Gibco™ cell culture basal media products can be customized using the Gibco™ Media Configurator. To check on a particular product, use the Media Configurator page to search by Gibco™ catalog number, or browse our offering by description. For the customization of non-media Gibco™ products, such as buffers and growth factors, contact us at email@example.com.
The Gibco™ Media Configurator allows you to add, remove, and adjust the concentration of components. In addition, you can select from a range of packaging, QC tests, and either cGMP or non-cGMP manufacturing.
No, the Gibco™ Media Configurator cannot be used to request pricing on non-Gibco cell culture products. However, we are very experienced at manufacturing customer-owned media formulations. Please visit www.thermofisher.com/custommedia or contact us at firstname.lastname@example.org for more information.
Using the Gibco™ Media Configurator, you can view specific customization options for your cell culture product, online, at any time. Also, this tool provides faster pricing for custom media, generally within 48 business hours.
Yes, there are price breaks for most configurations based on the volume purchased.
Yes, a Gibco™ catalog number is required to use the Gibco™ Media Configurator, as the customization options are tailored to a specific formulation.
If you are not currently using a similar Gibco™ formulation, browse our selection of Gibco™ products using the link found on www.thermofisher.com/mediaconfigurator.
No, it is not a requirement to be logged in to use the Gibco™ Media Configurator; however, it may expedite your request. In addition, if you are logged in, your quote requests will be stored in your history, facilitating future requests.
You will be notified if the product you need is already available as a stocked catalog product. All custom media requests undergo a comprehensive review by our feasibility engineers prior to production—it benefits both of us if your product can be shipped right away!
We have a dedicated team of Gibco™ Custom Media Specialists who can partner with you during customization, manufacturing, and delivery. Please email email@example.com or call the local phone number listed on www.thermofisher.com/mediaconfigurator with inquiries about your submission.
For questions related to website effectiveness, please contact System Support through the toll-free or local phone number.
Yes. If you were logged into the website while requesting your Gibco™ Media Configurator quotation, simply log back into thermofisher.com, retrieve the form from your Favorites, adjust it, and resubmit. If you were not logged in, please contact the Gibco™ Custom Media Specialist team for assistance.
Yes. Our Gibco™ Custom Media Specialists and R&D staff can provide advice related to the addition or elimination of media components. For more comprehensive services, our PD-Direct™ Bioprocess Services team specializes in media development and optimization.
The minimum order volume is generally 1 L for non-cGMP manufacturing (Gibco™ Media Express™) and 10 L for cGMP production. There may be exceptions, which will be displayed by the Media Configurator.
Yes. If you are reordering the same formulation, in the same quantity and packaging, simply use the Quick Order link found at the top of every page of thermofisher.com, or visit your Order History page and click on the Reorder box.
Contact your local Account Manager or your Custom Media Specialist for questions related to pricing. Custom price quotes are valid for 90 days, unless stated otherwise.
Manufacturing lead times can vary based on formulation, availability of raw materials, batch size, QC test duration, and overall customer demand. We monitor lead times closely, and we will provide you with an estimated time frame for delivery when you place an order. You can also discuss delivery requirements with your Gibco™ Custom Media Specialist or Account Manager.
Amphotericin B is the generic version of Fungizone. Fungizone is a trademark of E.R. Squibb & Sons, LLC.
None. The term "reduced serum" means that one can reduce the amount of serum they use with classical cell culture media. When working with Opti-MEM™ I medium, most cells that are routinely cultured in serum-supplemented medium may be transferred directly into Opti-MEM™ I medium with a minimum of 50% reduction in serum.
The Advanced media allow a reduction in serum usage from 50 to 90%. In the majority of cell lines, a 50% reduction can be achieved with no weaning procedure. Further reductions can be realized by weaning cells gradually. The amount of reduction in serum percentage beyond 50% will be cell line dependent. The advantages of using less serum include cost savings, particularly during those times when serum prices increase, extending the life of your serum lot, and reduced variability.
For more information on the Advanced DMEM and Advanced MEM, please search "Advanced Media" from our website home page.
Fetal Bovine Serum (FBS) was once known as Fetal Calf Serum (FCS). They are one and the same thing.
Remove serum from the freezer and allow it to thaw in the refrigerator at 2–8°C overnight. The thawing process may then be completed at room temperature. The serum must be regularly mixed during this process. Warning: Do not incubate FBS at 37°C for extended periods of time. The product may become cloudy, and performance could be affected due to the sensitivity of many serum components. Once it is thawed, you can use the product immediately.
No, there is no need to filter the serum before use. Gibco™ serum products are manufactured using the most stringent processes, including membrane filtration.
Yes. We offer a wide range of custom options. Please contact our Sera Specialists to discuss your application and research needs. We will work with you to supply sera specially processed and tested to meet your individual requirements. Some examples of our custom capabilities are heat inactivation, gamma irradiation, and testing for tetracycline residues.
Gamma irradiation is recognized as an effective method for inactivating viruses in animal-origin material. Based on USDA regulations for the general requirements for antibody products (9CFR, Section 113.450), the minimum dosage for blood derivatives of animal origin is 25 kGy. Certain European countries require products to be treated prior to importation with a minimum dose of 25 kGy.
We will gamma-irradiate serum on request. We have validated a process for utilizing gamma irradiation in the range of 30–45 kGy to inactivate the most common bovine viruses and mycoplasmas that may be present in FBS. The level of inactivation is 6–8 logs for viruses and 6–7 logs for mycoplasmas. We have also demonstrated that physiochemical properties and cell culture performance of serum is not altered by gamma irradiation at levels of 30–45 kGy.
Gamma irradiation is generally recognized by regulatory agencies as the best method of virus inactivation and for reducing the risk of viruses that are naturally present in animal sera. We offer a small range of gamma-irradiated products ex-stock. Gamma irradiation is also available on request as a custom service for most standard catalog products. We offer a range of fully validated custom processes covering many dose ranges.
The heating process inactivates portions of the complement cascade. Complement occurs in the following events: cytolytic activities, contraction of smooth muscle, release of histamine from mast cells and platelets, enhanced phagocytosis, chemotaxis, and activation of lymphocytic and macrophage cell types.
You can incubate the thawed product at a thermostatically controlled temperature of 56°C for 30 minutes. Serum can be heat-inactivated in both our plastic and glass bottles. Warning: Do not attempt to heat-inactivate at a higher temperature for prolonged periods as this may compromise the product’s performance through protein denaturation.
Gibco™ FBS is available in 100 mL, 500 mL, and 1,000 mL bottles and by special order in 3.5 L and 4 L volumes.
We recommend storing our FBS products at ≤-10 degrees C. The current United States Pharmacopeia (USP) and European Pharmacopoeia (EP) guidelines for monographs for serum refer to a storage temperature of ≤-10 degrees C.
While our previous recommended storage temperature of -5 to -20 degrees C have complied with this range, the change to ≤-10 degrees C ensures that the storage temperature range on the label and CoA is consistent with USP and EP requirements.
BVD stands for bovine viral diarreah. It is one of the most common viral infections in cattle. It is estimated that 70 to 90 percent of the world's cattle population is seropositive for BVD. This virus can cause abnormalities and fetal abortions in cattle. Several strains of BVD exist, some of which are non-pathogenic.
In cell culture applications, the Code of Federal Regulations (9CFR) has requirements for cell lines as well as ingredients used for the production of biologicals. It requires that the serum used for the production of biological products have a negative result for BVD virus.
BVD virus testing on Gibco™ serum is performed according to 9CFR protocols. An in-house specification of 0 to 4 is in place. A result of 0 indicates that a lot of serum is negative for the virus when tested according to 9CFR protocols. A result of 1–4 indicates that the lot of serum is positive for the virus. A +1 indicates low fluorescence and a +4 indicates high fluorescence for the virus. The word 'tested' is reported on the certificate of analysis for this test and not the actual BVDV fluorescent antibody value.
A lot of serum may have a 0 result when tested according to 9CFR protocols but be positive when tested using newer and more sensitive technologies such as PCR. To guarantee that a lot of serum be 'truly' negative for BVD virus, serum treatment such as gamma irradiation should be employed.
FBS is tested for tetracyline. The specification is “None Detected”, and this is listed on the COA. Minimum level of tetracycline that can be detected by the assay is 19.7 ng/mL.
It is dialyzed by tangential flow filtration against 0.15 M NaCl using a 10,000 molecular weight cut-off membrane until the glucose level is less than 5 mg/dL. Since this is not exhaustive dialysis, low–molecular weight dialyzable components, such as amino acids may not be totally removed. Exhaustive dialysis is not performed because it can result in precipitation and inactivation of serum peptides.
It is a quality indicator that reflects rapid collection and processing.
Usually the best way to find out is to go to the source you obtained your cells from. For example, ATCC will have serum requirements for the cells they sell. Most insect cell lines and embryonic stem cell lines require heat-inactivated serum.
It is made from polyethylene terephthalate (PET, PETE). This is the same plastic used in our other bottles.
It is at the discretion of the customer to reuse these bottles for purposes other than what they are intended for. But please note that they cannot be autoclaved.
Yes, the serum in the new One Shot FBS bottle can be heat inactivated at 56 degrees C for 30 minutes.
The current shelf life/stability for One Shot FBS is two years from the date of manufacture.
For optimal, burp-free pouring, securely grip the bottle using the indents and pour with the chamfered edge facing down.
The new One Shot FBS bottle is not shaped to fit into a traditional conical tube rack. It does however fit nicely in a 30 mm test tube rack for the purposes of storage and use in a water bath and biological safety cabinet.
Our previous One Shot bottle, a 60 mL Nalgene media bottle, is not designed for easy pipetting and pouring whereas the new One Shot FBS bottle has a propietary design that was developed specifically for FBS use. This design allows you to freeze, thaw and pour without the need to aliquot, which minimizes the amount of FBS handling and reduces the risk of contamination.
Yes, we also offer a 10 X 50 mL package, which is equivalent to a 500 mL bottle of FBS.
Phenol red is used as a true ion-front tracking dye for the very small pore–size gels, especially Tricine gels. Phenol red is smaller than Coomassie™ Blue G-250. In high percentage gels, molecules in this size range are resolved on the basis of size, such that phenol red runs with the ion front while G-250 can run as much as 2 cm behind the ion front. In gels suitable for resolving larger proteins, including the NuPAGE™ gels, G-250 runs with the ion front and is generally the more useful tracking dye.
Sodium pyruvate serves as an additional energy source for cells in culture. It is often added to low-glucose formulations (1.0 g/L glucose) and is sometimes added to higher-glucose formulations as well. Cells can become "hooked" on sodium pyruvate however, and if it is withdrawn suddenly from the media, they may experience a short lag in growth.
Sodium pyruvate (Cat. No. 11360070) is supplied as a liquid supplement for cell culture media at 100 mM (100X) and a concentration of 11,004 mg/L.
GlutaMAX™-I supplement is an improved cell culture supplement that can be used as a direct substitute for L-glutamine in your cell culture medium. Please click here to read more about the properties of GlutaMAX™ supplement.
The MEM Amino Acids Solution is used as a growth supplement for cell culture medium, to help increase cell growth and viability. It is formulated to contain 50X the essential amino acids (except L-glutamine) found in the standard MEM. Find the complete formulation here.
Granulated cell culture media is an easy-to-use, granular form of dry media that is produced by applying fluid bed granulation technology to cell culture nutrient media manufacturing. The patented process allows production of complete formulations of a variety of serum-free, protein-free, and chemically defined media in a dry format.
AGT™ offers the benefits of liquid media without the cost, storage, and transportation issues. It is a complete medium that is pH and osmolality pre-adjusted. The granules dissolve instantly for faster media preparation time than conventional dry powder media. AGT™ media can therefore help reduce total cycle costs, decreasing time involved in raw material planning, procurement, and testing as well as media preparation. These benefits are all realized while maintaining comparable cell growth to liquid media.
- Homogeneous distribution of minute components
- Complete complex formulations in a dry format, including serum-free, protein-free, and chemically defined nutrient media
- Pre-adjusted to the appropriate pH and osmolality
- Require only standard supplementation with L-glutamine for L-glutamine dependent systems
- Can be customized for modified catalog and customers’ proprietary formulations
- Dissolves instantly for faster media preparation times
- Dust-free granules reduce mess and environmental contamination
- Performance equivalent to liquid media
- Workflow improvement
- Helps reduce total cycle costs due to lower number of components, decreasing time involved in raw material planning, procurement, and testing
- Faster and easier media preparation, with less potential for error
- Easy to scale up from research through production, in batch sizes from 2 kg to 6,000 kg
- Available in various packaging options
MEM Non-Essential Amino Acids are used as a supplement for cell culture medium, to increase cell growth and viability. MEM Non-Essential Amino Acids contains the same non-essential amino acids found in the standard Minimum Essential Medium (MEM) at a strength of 100X. The complete formulation is available here.
Once reconstituted at 1X, 2X, and 3X concentrations, GlycanTune Total Feeds can be stored at room temperature (21-22 degrees C), in the dark, where they are stable for approximately 30 days.
The AGT dry format has a 12 month shelf-life.
We can provide DMF (drug master file) support or other support as needed.
It is a feed that allows you to shift the glycan profile from 90% G0F to as low as 45% G0F without significant loss of performance.
You just need to add water according to the instructions provided in the manual (https://tools.thermofisher.com/content/sfs/manuals/MAN0014673_glycantune_c_totalfeed_PI.pdf). No pH adjustment is needed
Yes, CTS AIM-V Medium is ready-to-use. Additional supplementation with cytokines and growth factors may be required for certain types of cells. Human serum or CTS Immune Cell SR (Cat. Nos. A2596101 and A2596102) can be added to AIM-V medium to promote cell expansion.
These two media have comparable performance and same cGMP quality. The main difference is that CTS AIM-V Medium (Cat. Nos. A3830801 and A3830802) does not contain phenol red and antibiotics. This medium formulation has been used as an ancillary reagent in a therapeutic cancer vaccine approved by FDA.
ExpiCHO Stable Production Medium (SPM) is a chemically defined protein-free, animal origin component-free medium developed specifically to support high titer expression of stable ExpiCHO-S clones in suspension. The medium is designed to provide a seamless scale-up solution for customers using the ExpiCHO Expression System for transient production looking to transition to the development of stable ExpiCHO clones. The medium is formulated without hypoxanthine and thymidine for use in dihydrofolate reductase (DHFR)-amplified systems, without L-glutamine or GlutaMAX I Supplement for use in glutamine synthetase systems, and without phenol red in order to minimize the estrogen-like effects of phenol red.
ExpiCHO SPM allows for direct transition from transient expression to the large scale production of stable clones with no adaptation. You can start process development faster, and streamline or simplify transfer to manufacturing scale. ExpiCHO SPM is available in liquid format (Cat. No. A3711001) or in dry AGT format (Cat. Nos. A3711101, A3711102, and A3711103)
Note: ExpiCHO SPM is not compatible for use as a medium during the transfection step.
No. Unlike ExpiCHO Expression Medium, ExpiCHO Stable Production Medium (SPM) is not recommended for transfection as it does not support high transient transfection efficiency.
No. ExpiCHO Stable Production Medium (SPM) needs to be supplemented with Glutamax or Glutamine.
The intended use statement for ExpiCHO Stable Production Medium (SPM) is as foll:
For Research Use or Further Manufacturing. Not for diagnostic use or direct administration into humans or animals.
Both products are similar, however, formulation changes had to be made to make the ExpiCHO Stable Production Medium (SPM) scalable to AGT format. One such change is that it requires the addition of Glutamax whereas ExpiCHO Expression Medium does not. Additionally, ExpiCHO SPM is not compatible with transfection whereas ExpiCHO Expression Medium is compatible with transfection.
In our initial work, we used a proprietary vector that cannot be disclosed.
We recommend using our pcDNA3.3-TOPO TA and pcDNA3.4-TOPO TA vectors. These vectors have only a single gene integration site so some modification will be necessary for antibody applications. You can use our GeneArt Express Cloning Service to create a modification that will allow you to clone both the heavy and light chains into the vector (ideally joined by an IRES site). Please note that other vectors may also be used, and that you may want to test initially with 2-3 vectors for best results.
We recommend using ExpiCHO SPM when transfection of ExpiCHO-S cells has been already completed with ExpiCHO Expression Medium, and you want to develop stable clones and scale up protein production.
We don't recommend using ExpiCHO SPM when you have an existing platform cell-line or feeds and are looking for a broadly usable medium, or when you need a transfection medium. We recommend using ExpiCHO Expression Medium for transfection.
Yes, when stable selection is desired, transfection takes place in the presence of ExpiCHO Expression Medium but in the absence of the enhancer and feed. About 48 hours post-transfection, stable selection starts by addition of the appropriate selection antibiotics.
A stability study involves testing of ExpiCHO-S clones for 60 generations (60 population doublings) to see if high protein expression is maintained.
After having obtained best expressing clones, a stability study is done. The time for a stability study varies (it depends how fast the cells double). It takes 60 generations or two months (whichever comes first).
Yes, ExpiCHO Stable Production Medium (SPM) is compatible with the GS/MSX (Glutamine Synthetase Expression Technology) selection.
No. The ExpiSf Expression System is able to achieve high protein yields because of the way the components of the system have been optimized to work together for maximal baculovirus production and protein expression. ExpiSf CD Medium is a chemically defined, yeastolate-free, high-density growth medium specifically matched to ExpiSf Enhancer. ExpiSf CD Medium is essential to support high-density growth of ExpiSf9 Cells and helps enable high-density infections.
Yes, you may be able to adapt your Sf9 cells for growth in ExpiSf CD Medium. We recommend following a serial adaptation protocol to slowly acclimate your cells for growth in ExpiSf CD Medium. A detailed cell adaptation protocol is provided in the ExpiSf CD Medium User Guide. Long-term adaptation in ExpiSf CD Medium may increase productivity of your Sf9 cells, and should support high-density growth. However, there is no guarantee that other insect cell lines will achieve the same levels of baculovirus and protein expression as the ExpiSf9 Cells. In limited testing, we have found other Sf9 and Sf21 cell lines to achieve lower maximum cell densities when fully adapted to ExpiSf CD Medium with lower protein yields. The performance of your own insect cell line in ExpiSf CD Medium will need to be empirically determined.
All three media formulations are protein-free and serum-free and optimized for Sf9 and Sf21 cell culture and protein expression. However, ExpiSf CD Medium is a chemically defined, yeastolate-free formulation whereas both Sf-900 II SFM and Sf-900 III SFM media contain hydrolysates, therefore making them undefined formulations. The absence of hydrolysates or any other undefined component makes ExpiSf CD Medium a superior formulation with greater lot-to-lot cell growth and protein expression consistency run after run. In terms of maximum cell densities, ExpiSf CD Medium can support the highest maximum Sf9 cell density of approximately 20 x 10E6 cells/mL whereas Sf-900 II SFM and Sf-900 III SFM support maximum Sf9 cell densities of 10 x 10E6 cells/mL and 14 x 10E6 cells/mL, respectively.
ExpiSf CD Medium is a core component of the ExpiSf Expression System and has been designed to support high-density growth of suspension ExpiSf9 cells. The medium supports superior baculovirus generation and protein expression as part of the ExpiSf System. You may adapt your own Sf9 cell line for growth in ExpiSf CD Medium using a sequential adaptation protocol described in the ExpiSf CD Medium User Guide. However, there is no guarantee that other insect cell lines will achieve the same levels of baculovirus and protein expression as the ExpiSf9 Cells.
The shelf life is 48 months from the date of manufacture.
The addition of iron in calf serum can result in higher performance of serum in cell culture applications. Iron-supplemented calf serum can be a viable alternative to fetal bovine serum in the growth of certain cells. Calf Serum with Iron (US Origin) is collected from calves 1-6 months of age, which naturally have higher levels of transferrin to bind iron. The iron content in Calf Serum with Iron (US Origin) is 500-700 µg/dL.
The complete CTS OpTmizer T-Cell Expansion SFM is stable for 4 weeks when stored in the dark at 2-8 degrees C. However, the two individual medium components are stable for 18 months when stored in the dark at 2-8 degrees C.
GlutaMAX cannot replace Glutamine because cells may not initially use GlutaMAX so that T cells cannot grow. We recommend adding 4 mM GlutaMAX and 2 mM Glutamine (as stated in the manual) into the CTS OpTmizer T-Cell Expansion SFM if GlutaMAX is needed.
We recommend using polypropylene tubes for storing aliquots of reconstituted Heat Stable Recombinant Human bFGF.
No, the His-tag has no effect on biological activity.
Yes, Heat Stable Recombinant Human bFGF is full-length at 155 amino acids. It contains an additional 20 amino acids of the N-terminal tag for purification purposes.
We recommend using the same working concentration that you are currently using for native human bFGF. Cell cultures should be monitored to determine whether the working concentration can be reduced.
Yes, Heat Stable Recombinant Human bFGF can be used in place of native human bFGF. It is a direct replacement, designed for greater stability in standard cell culture conditions.
No additives were used. Heat Stable Recombinant Human bFGF was engineered to maintain bioactivity at 37 degrees C. The patent pending technology has >90% sequence homology to native human bFGF.
Native human bFGF degrades at standard cell culture conditions (i.e., 37 degrees C). This means that more frequent media changes and/or more protein is required to maintain biological activity. Heat Stable Recombinant Human bFGF retains bioactivity, minimizing fluctuations to more closely mimic physiological conditions for cells.
We recommend that growth factor-supplemented medium is used within 2-4 weeks of supplementation with Heat Stable Recombinant Human bFGF.
Yes, aliquots can be frozen and stored at -20 degrees C for up to 1 year from date of receipt. Avoid additional freeze/thaw cycles.
The 5 µg size of Heat Stable Recombinant Human bFGF should be reconstituted directly in the intended culture medium, preferably in media containing BSA or similar protein.
Heat Stable Recombinant Human bFGF does not exhibit higher bioactivity, nor does it stimulate cell signaling differently than native bFGF.
We recommend using this product for exosome-specific assays, but you may also use it to culture the cells prior to the assay to minimize background signaling in your cells. We recommend determining the concentration to use, but 5–10% FBS is the most common.
Exosome-depleted FBS undergoes full sterility testing like our other sera products. It is subjected to additional tests for exosome depletion and a specific cell culture performance test.
The Exosome-depleted FBS that we ship to you will contain ≤10% of the exosomes present in the starting material FBS. We use an in-house fluorescence assay specifically developed for exosome quantification to confirm this level of depletion in every lot.
Yes, this has been tested. The product can be thawed into aliquots and refrozen.
We have developed a proprietary process to remove exosomes and maintain as much of the growth performance as possible.
We have specifically tested Jurkat, MCF-7, HeLa, PC3, HEK293, and A549 cells, all of which exhibited acceptable performance. HeLa cells showed the most sensitivity to the presence of Exosome-depleted FBS. Adjustments may be needed for the concentration of Exosome-depleted FBS to match the requirements of the specific cell line and system. We recommend starting at 10% Exosome-depleted FBS, and adjusting up or down from there as necessary. Also, the Exosome-depleted FBS has been tested and validated for a single passage of cells for 48 hours (and we have also tested HeLa, MCF-7, and HEK293 cells successfully up to 96 hours of culture).
Dynamis™ medium was designed to be more scalable in AGT™ dry format than CD FortiCHO™ liquid medium. Although there are many formulation similarities, the key differences are equimolar substitutions of alternate forms of some components as well as addition of a small amount of a component found in many other basal media.
When using a CHO cell line other than Lonza’s GS Gene Expression System™, addition of 2–8 mM L-glutamine or similar amount of GlutaMAX™ Supplement is recommended. Additionally, we recommend that you do not allow glucose levels to fall below 2 g/L in culture by supplementing with glucose as needed (see product insert for more details).
When culturing cells without complete feeds for fed-batch production, we recommend that you do not to allow glucose levels to fall below 2 g/L in culture by supplementing with glucose as needed (see product insert for more details). We have found that EfficientFeed™ A+, B+, and/or C+ supplements work well with Dynamis™ medium to maximize titers. We recommend trying EfficientFeed™ C+ 1X and 2X first, and if specific productivity drops off late in culture try the addition of FunctionMAX™ Titer Enhancer. No supplements should be added before reaching the day when half-peak cell density is reached for cultures not fed with complete feeding supplements like the EfficientFeed™ supplements
We have done some studies to show comparability of results between the two media, and that information may be filed with agencies in support of any work your Regulatory Team feels is necessary to establish transitioning from the one medium to the other. It is possible that characterization of your expressed protein after you see no other titer changes will be viewed no differently than a CMC update or minor modification to feeding profile during technical transfer to manufacturing. Of course our Regulatory Team would be happy to have a discussion with your team if it makes this transition any simpler for you.
TrypLE™ reagent is free of animal- and human-derived components, producing an exceptionally pure reagent that is gentle on cells. Inactivation with trypsin inhibitors is not required. TrypLE™ reagent is ideal for dissociating a variety of attachment-dependent mammalian cell lines both in serum and in serum-free conditions, and can be directly substituted for trypsin in your current protocol.
TrypLE™ reagent is room-temperature stable and ready to use when you need it. TrypLE™ cell dissociation reagents remain stable for 24 months at room temperature, making storage and handling easier and more convenient.
Both of the products contain rProtease, non-animal, trypsin-like enzyme formulation used for the dissociation of attachment-dependent cell lines. This alternative for porcine trypsin is a recombinant enzyme derived from microbial fermentation.
The Express and Select products differ in their production and testing methods and in the documentation provided. TrypLE™ Select is for the industrial market and has release-testing both for endotoxins and enzyme activity. This material also has a Drug Master File on record. It is manufactured in AOF-dedicated equipment and has Intended Use for Research Use/Further Cell Culture Manufacturing.
TrypLE™ Express is manufactured without use of dedicated equipment and is intended for Research Use Only. Not for use in diagnostic procedures.
To read more about TrypLE™ and cell release times using this reagent, please click here.
Yes, the TrypLE™ products contain rProtease, a non-animal, trypsin-like enzyme used for the dissociation of attachment dependent cell lines. TrypLE™ enzyme has demonstrated the ability to dissociate cells cultured both in serum-free and serum-supplemented systems. The catalog numbers for TrypLE™ Select are 12563-011 (100 mL) and 12563-029 (500 mL). Some example catalog numbers for TrypLE™ Express include 12604-013 without Phenol red (100 mL) and 12605-010 with Phenol red (100 mL). Both formulations are also available in additional sizes. All these products are animal origin–free.
For Research Use Only. Not for use in diagnostic procedures.