PurMa™ Roswell Park Memorial Institute 1640-MAX (RPMI-1640-MAX)

Description

PurMa™ RPMI-1640-MAX Cell Culture Medium

Product Description

PurMa™ RPMI-1640-MAX cell culture medium contains L‑alanyl‑L‑glutamine. PurMa™ Roswell Park Memorial Institute 1640-MAX (RPMI-1640-MAX) is a specialized mammalian cell culture medium. This RPMI-1640-MAX cell culture medium is engineered for demanding research and bioprocess workflows that need stable glutamine and strong pH control. The key innovation in RPMI-1640-MAX is the use of L‑alanyl‑L‑glutamine instead of free L‑glutamine. This single change dramatically improves medium stability, shelf life, and performance in culture.

What makes RPMI-1640-MAX different?

The major difference between RPMI-1640-MAX and regular RPMI‑1640 is the glutamine source. Standard RPMI‑1640 contains free L‑glutamine, which is chemically unstable in aqueous solution. Over time, L‑glutamine degrades and generates toxic ammonia and pyrrolidone carboxylic acid. PurMa™ RPMI-1640-MAX replaces L‑glutamine with 4 mM L‑alanyl‑L‑glutamine (0.869 g/L). This dipeptide is far more stable and degrades much more slowly in liquid media. As a result, the medium maintains its composition, pH, and performance for a longer period.

Advantages of RPMI-1640-MAX over standard RPMI‑1640

Because RPMI-1640-MAX cell culture medium contains L‑alanyl‑L‑glutamine, it offers several critical performance advantages:

• Higher pH buffering capacity
  Optimized sodium bicarbonate and, where applicable, HEPES levels provide superior pH stability during culture.
• Longer shelf life
  RPMI1640 with l alanyl lglutamine is highly stable in aqueous solution, extending the functional shelf life of the medium.
• Reduced toxic ammonia build‑up
  Minimal glutamine degradation means less ammonia accumulation, helping protect sensitive cell lines.
• Improved cell viability and growth
  More stable glutamine delivery supports robust proliferation and higher overall culture performance.
• Temperature stability
  The formulation remains stable across a wide range of temperatures during storage and handling.
• Better performance with primary cells
  Primary and hard‑to‑grow cells often respond better to the lower ammonia and stable nutrient environment.

These advantages make RPMI-1640-MAX ideally suited for long‑term cultures, high‑density cultures, and experiments that require reproducible conditions.

Mechanism: Why L‑alanyl‑L‑glutamine?

L‑glutamine is an essential amino acid for mammalian cell growth and protein synthesis.
However, in aqueous media it degrades over time, producing ammonia and pyrrolidone carboxylic acid.
This degradation changes the medium composition, raises toxicity, and can compromise experimental results.

One strategy is to repeatedly add fresh L‑glutamine to the culture.
In practice, this is labor‑intensive and difficult to control precisely over time.

Advantages of a cell culture medium that contains L-alanyl-L-glutamine.
This dipeptide is much more stable in solution and does not rapidly generate ammonia.
Instead, cellular aminopeptidases gradually cleave L‑alanyl‑L‑glutamine into L‑glutamine and L‑alanine.
The released amino acids are then used by the cells for protein synthesis and energy production in the TCA cycle.

By providing a controlled, sustained release of glutamine, RPMI-1640-MAX helps maintain consistent culture conditions from start to finish.

Composition of RPMI-1640-MAX

PurMa™ RPMI-1640-MAX cell culture medium is based on a modified RPMI‑1640 formulation and contains:

• 4 mM L‑alanyl‑L‑glutamine (0.869 g/L) instead of L‑glutamine
• 5 mM sodium pyruvate
• High glucose (4.5 g/L)
• Non‑essential amino acids (NEAA)
• 3.7 g/L sodium bicarbonate
• Phenol red as a pH indicator

PurMa Biologics manufactures several RPMI-1640-MAX variants with different sodium bicarbonate and HEPES concentrations. For instance RPMI1640-MAX alanyl lglutamine hepes without phenol is available in PurMa Biologics. The combination of L-alanyl-L-glutamine and HEPES offers an extra buffering capacity which prevents contamination against mold as well as mycoplasma. PurMa Biologics manufactures  RPMI with  lglutamine hepes without phenol red as well: Here is the Link 
These options allow you to select the pH buffering capacity that best matches your incubator conditions and experimental needs.

Note: RPMI-1640-MAX cell culture medium contains L‑alanyl‑L‑glutamine but does not contain any proteins, lipids, or growth factors.
For complete medium, supplementation with 10% Fetal Bovine Serum (FBS) or an appropriate serum replacement is required.

Formulation

For complete formulation click here: RPMI-1640 MAX Formulation

Applications

This RPMI-1640-MAX cell culture medium is designed for:

• Routine culture of mammalian cell lines historically grown in RPMI‑1640
• Long‑term and high‑density cultures requiring stable glutamine levels
• Primary cells and sensitive cell types that are susceptible to ammonia toxicity
• Experiments needing highly reproducible metabolic and pH conditions
• Assays where changes in ammonia or pH could confound functional readouts

By minimizing medium variability, RPMI-1640-MAX supports high‑quality, publication‑ready data and smoother scale‑up.

Related stabilized glutamine product

In addition to our MAX formulation media, PurMa Biologics manufactures PurMa™ GluaSup (Cat# P3S210 559).
PurMa™ GluaSup is a concentrated L‑alanyl‑L‑glutamine supplement designed to prevent L‑glutamine degradation in other basal media.
It is ideal when you want to upgrade existing media formulations with the same stabilized glutamine technology used in RPMI-1640-MAX.

FAQs

Q1. What is the main difference between RPMI-1640-MAX and standard RPMI‑1640?
The main difference is the glutamine source.
RPMI-1640-MAX replaces unstable L‑glutamine with 4 mM L‑alanyl‑L‑glutamine.
This change improves pH stability, shelf life, and reduces toxic ammonia build‑up, which enhances cell viability and growth.

Q2. Why does L‑alanyl‑L‑glutamine extend the shelf life of the medium?
L‑alanyl‑L‑glutamine is much more stable in aqueous solution than free L‑glutamine.
It degrades slowly and does not rapidly generate ammonia or breakdown products.
RPMI-1640-MAX cell culture medium contains L‑alanyl‑L‑glutamine, which keeps the medium closer to its original composition for a longer time.

Q3. Does RPMI-1640-MAX reduce the risk of contamination?
RPMI-1640-MAX does not directly sterilize cultures, but its higher buffering capacity and stability help maintain physiological pH.
Stable pH and consistent medium composition reduce stress on cells and minimize conditions that can favor opportunistic contaminants.
Standard aseptic technique and proper filtration are still required.

Q4. Do I need to add FBS or other supplements to RPMI-1640-MAX?
Yes. RPMI-1640-MAX does not contain proteins, lipids, or growth factors.
For most applications, we recommend supplementing with 10% Fetal Bovine Serum (FBS) or an appropriate serum alternative.
Additional supplements can be added according to your cell line’s specific requirements. But because RPMI-1640-MAX cell culture medium contains L‑alanyl‑L‑glutamine, FBS performs better due to the condition mentioned above.

Q5. Is RPMI-1640-MAX suitable for primary cells?
Yes. RPMI-1640-MAX is particularly well suited for primary and sensitive cells.
The stabilized L‑alanyl‑L‑glutamine minimizes ammonia accumulation and maintains more consistent pH.
These features create a gentler environment that can support better attachment, viability, and long‑term growth of primary cells.

Q6. How should I store and handle RPMI-1640-MAX?
Store RPMI-1640-MAX cell culture medium, which contains L‑alanyl‑L‑glutamine, as recommended on the product label, typically at 2–8 °C and protected from light.
Avoid repeated freeze–thaw cycles and prolonged exposure to room temperature. Because RPMI-1640-MAX cell culture medium contains L‑alanyl‑L‑glutamine, it will keep the potency much longer.
Use aseptic technique when opening and aliquoting to maintain sterility and maximize shelf life.

References

1. Culture of normal human leukocytes. Moore GE, et al. 1967 Feb 20;199(8):519-24. PMID: 4960081
2. Leukocytes as carriers in the transmission of bovine leukemia: certain morphologic and functional characteristics of cultured leukocytes from normal and leukemic cattle. Dunne HW, et al. Am J Vet Res. 1970 Apr;31(4):597-617. PMID: 5437104.
3. Long-term culture of human leukaemic leukocytes. Pössnerová V, et al. 1970;17(5):513-23. PMID: 5274436

Parameter	Specification
Appearance	clear liquid, Red liquid
pH	7.4 ± 0.1
Osmolality	275-360 mOsm/L
Endotoxin	NMT< 2EU/mL
Mycoplasma	Negative
Suitability	Suitable for mammalian cell culture
Additive	NA
Indicator	NA
Sterility Tested	Sterile filtered using 0.22 µm filter
Form	Liquid
Shipping Condition	Dry Ice

 

Learn more: What Is RPMI 1640?