T Cell Medium (RPMI + 10% FCS + Supplements)
Dillon Corvino
Protocol ID: BUF-TCELL-MED Version: v1.2 Author: Dillon Corvino Date: September 18, 2026
Purpose
Complete T cell medium based on RPMI 1640, supplemented for optimal survival, activation, and expansion of mouse T cells and NLCs in vitro.
Linked protocols
NLC-PLATE-STIM
Working buffer composition
| Component | Final concentration | Notes |
|---|---|---|
| RPMI 1640 | — | Base medium |
| Fetal calf serum (FCS) | 10% (v/v) | Heat-inactivated |
| Penicillin/Streptomycin | 1% (v/v) | 100x stock → 1x final |
| L-glutamine | 2 mM | From 200 mM stock; prefer GlutaMAX if medium will be stored at 4°C for weeks — L-glutamine degrades over time |
| Sodium pyruvate | 1 mM | From 100 mM stock; optional |
| beta-mercaptoethanol | 50 uM | From 50 mM stock |
| HEPES | 10 mM | From 1 M stock; optional but common |
| MEM Non-essential amino acids (NEAAs) | 1% (v/v) | 100x stock → 1x final; optional |
Sodium pyruvate, HEPES, and NEAAs are optional but improve viability in longer cultures and under stress conditions. Worth including for multiday assays (>48 h) or when cells will be under metabolic stress (e.g. cytokine stimulation, limiting nutrients).
Beta-mercaptoethanol is particularly important for mouse primary cells, which are more sensitive to oxidative stress than human cell lines. Do not omit for primary mouse T cells or NLCs.
GlutaMAX vs L-glutamine: If medium will be stored at 4°C for more than 1–2 weeks, substitute GlutaMAX at the same volume — L-glutamine degrades to pyroglutamate and ammonia over time, which is toxic at high concentrations. GlutaMAX is stable and converted to glutamine by cells.
Preparation
A. Preparation of stock (if applicable)
Not applicable — prepared directly as the working buffer.
B. Preparation of working buffer
Stock solutions required
| Reagent | Stock concentration | Dilution to final | Optional |
|---|---|---|---|
| Fetal calf serum (FCS) | — | 10% (v/v) | No |
| Penicillin/Streptomycin | 100x | 1:100 | No |
| L-glutamine (or GlutaMAX) | 200 mM | 1:100 | No |
| Sodium pyruvate | 100 mM | 1:100 | Yes |
| beta-mercaptoethanol | 50 mM | 1:1000 | No |
| HEPES | 1 M | 1:100 | Yes |
| MEM NEAAs | 100x | 1:100 | Yes |
| RPMI 1640 | — | Base medium | No |
Volume calculations
Dilution logic:
- 10% FCS → 1:10
- 1% Pen/Strep (100x) → 1:100
- 2 mM L-glut from 200 mM → 1:100
- 1 mM sodium pyruvate from 100 mM → 1:100 (optional)
- 50 uM beta-mercaptoethanol from 50 mM → 1:1000
- 10 mM HEPES from 1 M → 1:100 (optional)
- 1x NEAAs from 100x → 1:100 (optional)
Preparation table
Volumes for mandatory components. Add optional supplements (pyruvate, HEPES, NEAAs) by substituting equivalent volume from the RPMI column.
| Reagent | 10 mL | 50 mL | 100 mL | 200 mL | 500 mL |
|---|---|---|---|---|---|
| RPMI (mL) | 8.69 | 43.45 | 86.9 | 173.8 | 434.5 |
| FCS (mL) | 1.0 | 5.0 | 10.0 | 20.0 | 50.0 |
| Pen/Strep (uL) | 100 | 500 | 1,000 | 2,000 | 5,000 |
| L-glut / GlutaMAX (uL) | 100 | 500 | 1,000 | 2,000 | 5,000 |
| beta-ME (uL) | 10 | 50 | 100 | 200 | 500 |
| Pyruvate (uL) opt | 100 | 500 | 1,000 | 2,000 | 5,000 |
| HEPES (uL) opt | 100 | 500 | 1,000 | 2,000 | 5,000 |
| NEAAs (uL) opt | 100 | 500 | 1,000 | 2,000 | 5,000 |
Label with: - T Cell Complete Medium - Date of preparation - Expiry (4 weeks after preparation)
Add beta-mercaptoethanol fresh where possible for optimal T cell viability.
Storage and stability
- Store at 4 °C, protected from light.
- Use within 4 weeks after preparation.
- Do not freeze.
Reagent details
| Reagent | Supplier | Cat. # | Notes |
|---|---|---|---|
| RPMI 1640 | Various | — | Base medium |
| Fetal calf serum | Various | — | Heat-inactivated |
| Pen/Strep (100x) | Various | — | Antibiotics |
| L-glutamine (200 mM) | Various | — | Degrades over weeks at 4°C; substitute GlutaMAX for long-stored medium |
| GlutaMAX (200 mM) | Various | — | Stable dipeptide alternative to L-glutamine; use at same volume |
| Sodium pyruvate (100 mM) | Various | — | Optional |
| beta-mercaptoethanol | Various | — | Handle in hood; essential for mouse primary cells |
| HEPES (1 M) | Various | — | Optional; buffering capacity for longer assays |
| MEM NEAAs (100x) | Various | — | Optional; supports viability in multiday cultures |
Safety (brief)
- Handle medium aseptically in a biosafety cabinet.
- beta-mercaptoethanol is toxic and volatile; handle in a chemical hood.
- Dispose of expired or contaminated medium as biohazardous waste.
Version history
| Version | Date | Author | Changes |
|---|---|---|---|
| v1.0 | 2026-03-02 | Dillon Corvino | Initial T cell medium document |
| v1.1 | 2026-04-15 | Dillon Corvino | Added HEPES (optional, 10 mM) and MEM NEAAs (optional, 1x) to composition; marked sodium pyruvate as optional; added notes on GlutaMAX vs L-glutamine stability, beta-ME importance for mouse primary cells, and conditions where optional supplements are recommended |
| v1.2 | 2026-09-18 | Dillon Corvino | Migrated to shared summary:/helper architecture (buffer/protocol redesign). |