Bambanker hRM Cell Freezing Media

Long-term storage of human ES cells, human iPSCs, and more

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Bambanker hRM for ES and iPS cells
Human/primate embryonic stem cells and induced-pluripotent stem cells are extremely sensitive to cryopreservation, which presents many difficulties when compared cells from mice and other animal sources. At present, the vitrification method is considered adequate for primate ES/iPS cells, although the slow-freezing method using DMSO has been popular for a wide variety of cell lines. Vitrification requires impeccable timing, a high level of skill, and still can yield poor results when everything is done right. In addition, this method shows sensitivity to dry ice transportation. To address these problems, a new freezing method for human cells has been developed and based upon the primate-specific Bambanker hRM cryopreservation reagent. What makes it so special is the omission of bovine serum albumin (which can sometimes lead to cell differentiation) and any animal-derived material — it’s “xeno-free” — which can improve the storage and survival rates of a broad range of primate/human cells lines, primary cells and stem cells — while greatly simplifying the freezing protocol. Here are some Technical Notes demonstrating the advantages:

Improvements for human iPSCs cryopreservation

Improved cell induction from Bambanker stored cells

Improved survival rates for human acute myeloid leukemia cell lines

Better results using Bambanker with a different human leukemia cell line

Bambanker and Bambanker hRM provide similar results for human iPS cells & ES cells

Bambanker is easy to use – and better for your cells!
Cryopreservation of mammalian cells is extremely valuable and very common in biological research. Fear of losing a cell line to contamination or incubator failure is frequently the impetus for making archival storage of cells a high priority after receiving or generating a new cell line. While there are numerous protocols for freezing cells, all involve the use of a ‘freezing medium’ containing a cryoprotectant. Once transferred from growth media to freezing medium, the cells are usually frozen at a controlled rate and stored in liquid nitrogen vapor or at -130°C in a mechanical deep-freeze. Although freezing a cell line is a commonly-performed procedure, problems arise when suitable freezer space is not available, or when unwanted variables are introduced by the presence of serum, extra washes, or complicated freezing algorithms.

These problems have been resolved by the family of Bambanker Cell Freezing Media reagents. The unique technology of Bambanker permits cryopreservation of cells at -80°C or in liquid nitrogen, obviating the need for an additional and expensive ultra-low freezer and avoiding time consuming and complicated controlled freezing protocols. Simply:

  1. harvest and prepare cells
  2. resuspend in one of four types of Bambanker
  3. transfer to a cryovial
  4. immediately freeze at -80°C

No programmed or sequential freezing is required! All Bambanker reagents are free from serum — delivered ready-to-use — and can be kept in the refrigerator for up to two years.

Higher number of intact, healthy, and undifferentiated cells after thawing
How much are your cells worth? The family of Bambanker freezing reagents offer the unique combination of simplicity and high survivability. The results can be miraculous. These products have been used extensively across the globe. Developed in Japan, Bambanker reagents have been validated on well over 1,000 different cell lines at the JCRB. You can also see these recent published references as a testament to its successful use in labs. . The vast majority of cell types show survival greater than 50%, with many at 90% or more. Even pose no problem.

Unwanted cell differentiation can also be an issue with long-term storage of frozen cells. . And for particularly troublesome cells, Bambanker DMSO-Free is specially formulated to prevent such issues that can be associated with DMSO-containing cryopreservation reagents. So come join the growing number of labs protecting their cell lines with Bambanker!

Serum adds variation to long-term storage
All Bambanker products are produced with no serum. Cryopreservation media which contain animal-derived whole serum have the disadvantage of fluctuations in recovery rates and undefined composition. Reproducibility of experiments with cells frozen in a serum-containing cryopreservation medium may be affected by lot-to-lot variation of the serum, since the composition and concentration of proteins and other biological molecules varies with each batch. Problems may arise when thawing and using cells stored with such serum-containing freezing reagents. But you’ll be able to breathe easy with Bambanker reagents: every ingredient is precisely defined, including the use of serum albumin proteins, so that you can be confident that Bambanker-preserved cells will all behave and recover similarly.

Additional Information

Cells were incubated as described in the protocols. Cell viability was determined after twelve months

Cell freezing experiment with HSC (8.8 x 10^8 cells), hematopoietic stem cells. The left picture shows the cells before freezing and the right picture shows the cells after freezing and thawing.

Bambanker HRM is a excellent product. We used for all our stem cell applications in our laboratory and for freezing sensitive cell lines. Viability and recovery in Bambanker HRM is >90% and the best part is that it is direct freeze reagent in -80C.
Stanford University, 2022


We use Bambanker HRM​ as it gives us a relatively complete preservation of the cellular components from clinical samples [human peripheral blood], and maintain the cell viability relatively well through freeze/thaw. Thus allowing us to store and perform assays on previously collected samples with minimal loss of cell count and viability.
Dr. Hsu, Boston Childrens Hospital/Harvard, 2022


Extremely easy-to-use product. Quick and efficient freezing medium validated in iPSCs. Conventional thawing methods (post-freezing with Bambanker) result in high yield of viable cells.
Wang Lab, Stanford University, 2022


We use Bambanker HRM in our lab and we have been very happy with it. We have human induced pluripotent stem cells that we work with which have come from “diseased” individuals. These cells don’t come out of freeze thaw very well. We have only been able to get them to survive by using Bambanker. It has been essential for us.
Researcher, Van Andel Institute, 2017


For the last 2 years Bambanker HRM has been extensively used in our lab to cryopreserve human induced pluripotent cells. We wanted to stay in a xeno-free environment. Hence, Bambanker HRM was the best choice.
Christian, University Medicine Rostock, 2017

Part Numbers BBH01,  BBH03, BBH04
Cyroprotectant DMSO
Ready-to-use Yes
GMP Manufactured Yes
Dilution Required None
Additives Needed None
Stepwise Freezing None
Serum Free Yes
Enzyme Free Yes
Serum Albumin Yes, human serum albumin
Cell Type Compatibility All, adherent & suspension
Cell Storage Temp -80°C or liquid nitrogen
Survival after 12 months 50% to 100% of cells
Storage 2 years at 4°C