FBS ES Cell Pre-Tested — Embryonic Stem Cell & iPSC Qualified FBS | SeamlessBio
FBS ES Cell Pre-Tested — Embryonic Stem Cell & iPSC Qualified
Embryonic stem cells (ESC) and induced pluripotent stem cells (iPSC) are uniquely sensitive to serum lot variability. Even small differences in growth factor composition, endotoxin levels, or uncharacterised inhibitory factors between FBS lots can cause spontaneous differentiation, loss of pluripotency markers, and inability to maintain self-renewing colonies. ES Cell Pre-Tested FBS is batch-validated specifically for its ability to maintain pluripotency in mouse ESC or human iPSC — removing the need for individual lot testing in your lab.
The lot-to-lot problem: Not all FBS lots support pluripotent stem cell growth equally. Standard FBS lots are tested for general cell culture performance but not for pluripotency maintenance specifically. ES Cell Pre-Tested FBS is screened against pluripotency endpoints — saving 4–8 weeks of in-house lot validation per lot change.
Validation Criteria for ES Cell Pre-Tested FBS
| Endpoint | Method | Acceptance Criteria |
|---|
| Colony morphology | Visual inspection of mESC/hESC colonies | Compact, well-defined dome-shaped ESC colonies without differentiated cells at edges |
| Alkaline phosphatase activity | AP staining of ESC colonies | Strong AP-positive staining in >90% of colonies |
| Oct4 / Nanog expression | ICC or flow cytometry | ≥85% Oct4+/Nanog+ cells after 5 passages |
| Growth rate | Cell count per passage | Proliferation rate comparable to reference lot |
| Differentiation potential | Embryoid body formation | EB formation efficiency ≥ reference lot |
Applications
| Application | Notes |
|---|
| Mouse embryonic stem cell (mESC) maintenance | LIF-supplemented culture on MEF feeders or gelatin — requires lot pre-tested for mESC pluripotency |
| Human iPSC culture (serum-based protocols) | Some iPSC protocols still use FBS-supplemented MEF-conditioned medium — pre-tested lots essential |
| iPSC derivation from somatic cells | Reprogramming efficiency and colony quality sensitive to FBS lot |
| Pluripotent stem cell banking | Consistent lot required for long-term banking to avoid variability between banking and recovery |
| Directed differentiation protocols | Starting pluripotency quality directly affects differentiation efficiency — pre-tested FBS reduces variability |
Specifications
| Parameter | Specification |
|---|
| Pluripotency validation | Pre-tested on mESC or hESC — colony morphology, AP, Oct4/Nanog (specify cell line) |
| Endotoxin | ≤1 EU/mL (Very Low Endotoxin grade) |
| Sterile filtration | 0.1 µm |
| Mycoplasma | Tested — negative |
| BVDV | Tested — negative |
| Origin | EU and/or US |
| Lot reservation | Available — reserve entire validated lot for your project duration |
| Documentation | CoA with pluripotency validation data, CoO, MSDS |
FBS Portfolio — All Grades
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Contact: info@seamlessbio.de | +49 851 37932226
