Name: XR NKCryo Serum-Free NK Cell Cryopreservation Medium
Brand: XR
SKU: XRNKCRYO-0-100

What is XR NKCryo used for?

XR NKCryo is a serum-free NK cell cryopreservation medium designed to protect human natural killer cells during freezing, dry ice transportation, thawing and long-term storage.

What is the DMSO concentration in XR NKCryo?

XR NKCryo contains 10% DMSO by volume.

What NK cell freezing density does XR NKCryo support?

XR NKCryo supports human NK cell freezing densities ranging from 1 × 10^6 to 5 × 10^8 cells per milliliter.

Can XR NKCryo be used for PBMC-derived and cord blood-derived NK cells?

XR NKCryo is intended for human NK cells, including NK cells generated from peripheral blood or cord blood mononuclear cell sources.

How should NK cells frozen in XR NKCryo be stored?

Cells may be frozen overnight at -80°C using a controlled-rate freezing container and then transferred to liquid nitrogen at approximately -196°C for long-term storage.

Description

Human NK cells can be particularly sensitive to freezing and thawing. Loss of membrane integrity, reduced post-thaw viability and incomplete cell recovery may disrupt downstream expansion, phenotyping and functional assays. These challenges become more significant when laboratories need to freeze highly concentrated NK cell preparations, transport frozen samples on dry ice or establish reproducible long-term cell banks.

XR NKCryo is a serum-free NK cell cryopreservation medium developed specifically for human natural killer cell preservation. Its formulation provides cryoprotective components and nutritional support intended to reduce cellular stress during freezing, dry ice transportation and thawing while helping preserve cell viability and recovery after storage.

This human NK cell freezing medium contains no human- or animal-derived ingredients and no protein components, helping reduce the introduction of heterogeneous biological materials into frozen cell preparations. The formulation contains 10% DMSO and uses cell culture-grade, low-endotoxin raw materials.

XR NKCryo supports a broad freezing-density range of 1 × 10⁶ to 5 × 10⁸ cells/mL. It is suitable for human NK cells, including NK cells derived from peripheral blood mononuclear cells and cord blood mononuclear cells, and can be integrated into NK cell expansion, cryopreservation and post-thaw recovery workflows.

Research use only: XR NKCryo is intended for laboratory research applications and is not intended for direct therapeutic or diagnostic use.

Specifications

Product Name	XR NKCryo NK Cell Cryopreservation Medium
Reference	XRNKCRYO-0-100
Product Type	Serum-free human NK cell freezing medium
Primary Application	Human NK cell cryopreservation, frozen transportation and post-thaw recovery
Applicable Cells	Human NK cells, including peripheral blood- and cord blood-derived NK cells
Format	Serum-free, animal component-free and protein-free
DMSO Concentration	10% (v/v)
Supported Freezing Density	1 × 10⁶ to 5 × 10⁸ cells/mL
Specification	100 mL
Endotoxin	≤0.1 EU/mL
Filtration	<0.2 μm
Bacterial Testing	Not detected
Fungal Testing	Not detected
Product Storage	2–8°C
Cell Storage	-80°C for short-term storage; liquid nitrogen at approximately -196°C for long-term storage
Shelf Life	12 months
Research Use	For research use only

Features

NK Cell-Specific Cryopreservation Solution — XR NKCryo is designed specifically for human natural killer cell cryopreservation workflows, helping laboratories maintain NK cell quality during freezing, transportation and thawing procedures.
Serum-Free and Animal Component-Free Formulation — The formulation contains no human- or animal-derived components, reducing the risk of introducing undefined biological materials during NK cell storage.
Protein-Free Cryopreservation Medium — XR NKCryo contains no protein components, supporting applications requiring controlled cryopreservation conditions for immune cell research.
Optimized for Human NK Cell Freezing — Suitable for NK cells generated from peripheral blood mononuclear cells (PBMCs) and cord blood mononuclear cell sources.
High-Density NK Cell Freezing Capability — Supports cryopreservation densities ranging from 1 × 10⁶ to 5 × 10⁸ cells/mL, accommodating both routine laboratory storage and high-density immune cell banking workflows.
Supports Post-Thaw NK Cell Recovery — Designed to minimize freezing-related stress and maintain high post-thaw cell viability and recovery after cryopreservation.
Low Endotoxin Cell Culture Grade — Manufactured with cell culture-grade raw materials and controlled endotoxin levels for reliable immune cell research applications.
Compatible with NK Cell Expansion Workflows — Can be integrated into workflows involving NK cell activation, expansion, freezing and subsequent recovery culture.

Performance Data

Post-Thaw NK Cell Viability After Cryopreservation

Cryopreservation performance was evaluated using human NK cells with a CD3^-CD56⁺ proportion greater than 90%. Cells were generated from cord blood-derived mononuclear cells and expanded using an XR NK activation workflow before freezing with XR NKCryo.

The evaluation demonstrated that XR NKCryo supports high NK cell survival after cryopreservation. Under high-density freezing conditions, cells maintained post-thaw viability above 90% after 3 months of storage and maintained viability above 80% during a 6-month storage period.

Post-thaw viability analysis of human NK cells preserved with XR NKCryo NK cell cryopreservation medium

NK Cell Recovery After Long-Term Storage

Cell recovery analysis demonstrated that XR NKCryo maintains a high recovery rate following extended cryopreservation. After 6 months of storage, frozen NK cells maintained more than 80% cell recovery after thawing.

Human NK cell recovery rate after long-term storage using serum-free NK cell cryopreservation medium

Recommended Cryopreservation Workflow

XR NKCryo provides a standardized workflow for laboratories performing human NK cell expansion, freezing and recovery experiments. The recommended process includes cell harvesting, cryoprotectant addition, controlled-rate freezing and transfer to long-term storage.

Step 1: NK Cell Collection

After completion of NK cell culture and expansion, collect NK cells by centrifugation and carefully remove the culture supernatant.

Step 2: Add XR NKCryo Freezing Medium

Slowly add XR NKCryo cryopreservation medium to the cell pellet. Gently resuspend the cells to achieve a uniform suspension.

Recommended final freezing density:

1 × 10⁶ to 5 × 10⁸ cells/mL

Step 3: Controlled Cooling and Storage

Transfer prepared cryovials into a controlled-rate freezing container and place them at -80°C. For long-term storage, transfer cells to liquid nitrogen storage after approximately 12 hours.

Step 4: NK Cell Thawing and Recovery

Thaw frozen NK cells using a 37°C water bath or cell recovery instrument. Transfer cells into a centrifuge tube and add at least three volumes of serum-free NK cell culture medium or physiological saline to dilute the cryopreservation solution. Centrifuge to remove the freezing medium before downstream experiments.

Applications

XR NKCryo Serum-Free NK Cell Cryopreservation Medium is designed for laboratories working with human natural killer cells, immune cell expansion platforms and cell-based research workflows requiring reliable frozen cell preservation.

The product supports applications where maintaining NK cell viability, recovery and consistency after thawing is important, including immune cell research, NK cell banking and cell therapy development workflows.

Human NK Cell Cryopreservation — Supports freezing and storage of expanded human NK cells while maintaining post-thaw viability for further research.
NK Cell Expansion and Cryopreservation — Suitable for workflows combining NK cell activation, expansion, harvesting and long-term frozen storage.
PBMC-Derived NK Cell Preservation — Designed for NK cells generated from peripheral blood mononuclear cell sources.
Cord Blood NK Cell Cryopreservation — Applicable for research workflows using cord blood-derived NK cell populations.
Immune Cell Cryopreservation Research — Provides a specialized cryopreservation solution for immune cell-based laboratory studies.
CAR-NK Cell Research — Suitable for research workflows where expanded NK cell populations require freezing, storage and recovery before functional analysis.
NK Cell Banking — Supports establishment of frozen NK cell stocks for repeated experimental use and longitudinal studies.
Post-Thaw NK Cell Functional Studies — Enables recovery of NK cells for downstream assays including phenotype analysis, expansion studies and immune function evaluation.

Advantages for NK Cell Research Workflows

Maintaining consistent NK cell quality after freezing is an important consideration in immune cell research. Variations in freezing conditions, cryoprotectant formulations and cell density may influence recovery performance and experimental reproducibility.

XR NKCryo provides a dedicated NK cell freezing solution designed around the requirements of human NK cell preservation. Its serum-free, protein-free and animal component-free formulation helps researchers establish controlled cryopreservation workflows while supporting high-density NK cell storage.

By combining optimized cryoprotection, low endotoxin manufacturing control and compatibility with NK expansion workflows, XR NKCryo helps laboratories reduce variability between fresh and frozen NK cell experiments.

Experimental Considerations

Use freshly harvested and healthy NK cells with appropriate viability before cryopreservation.
Maintain recommended freezing density to achieve consistent cryopreservation performance.
Use controlled-rate freezing procedures whenever possible to reduce freezing stress.
Avoid repeated freeze-thaw cycles of cryopreserved NK cell samples.
Evaluate post-thaw viability and recovery before downstream functional assays.

FAQ

What is XR NKCryo NK Cell Cryopreservation Medium?

XR NKCryo is a serum-free NK cell cryopreservation medium developed specifically for human natural killer cell freezing, storage and recovery. It is designed to reduce cellular stress during freezing, transportation and thawing while supporting post-thaw NK cell viability and recovery.

What type of cells can be preserved with XR NKCryo?

XR NKCryo is designed for human NK cell cryopreservation applications, including NK cells derived from peripheral blood mononuclear cells (PBMCs) and cord blood mononuclear cell sources.

Is XR NKCryo a serum-free NK cell freezing medium?

Yes. XR NKCryo is a serum-free, animal component-free and protein-free cryopreservation medium. The formulation does not contain human- or animal-derived components, helping reduce variability associated with undefined biological materials.

Does XR NKCryo contain DMSO?

Yes. XR NKCryo contains 10% DMSO (v/v), which provides cryoprotective activity during the freezing process.

What freezing density is recommended for XR NKCryo?

XR NKCryo supports high-density NK cell cryopreservation from 1 × 10⁶ to 5 × 10⁸ cells/mL. The appropriate freezing density may depend on the experimental design and downstream application requirements.

Can XR NKCryo be used for NK cell expansion and cryopreservation workflows?

Yes. XR NKCryo can be incorporated into workflows involving NK cell activation, expansion, harvesting, cryopreservation and post-thaw recovery for research applications.

How long can NK cells be stored after freezing with XR NKCryo?

For long-term storage, NK cells frozen with XR NKCryo can be transferred to liquid nitrogen storage after initial freezing. Performance evaluation demonstrated maintained cell viability and recovery during extended storage periods.

What post-thaw performance can be expected from XR NKCryo?

Performance evaluation showed that NK cells cryopreserved with XR NKCryo maintained post-thaw viability above 90% after 3 months and above 80% after 6 months under tested storage conditions. Cell recovery after 6 months remained above 80%.

Can XR NKCryo support CAR-NK cell research workflows?

Yes. XR NKCryo can support research workflows where expanded NK cell populations, including CAR-NK related research samples, require freezing, storage and recovery before downstream analysis.

How should NK cells frozen with XR NKCryo be thawed?

Frozen NK cells can be thawed using a 37°C water bath or cell recovery instrument. After thawing, add at least three volumes of serum-free NK cell culture medium or physiological saline, then centrifuge to remove the cryopreservation medium before further experiments.

What quality control tests are performed for XR NKCryo?

XR NKCryo is tested for endotoxin level, bacterial contamination and fungal contamination. The product is filtered through a membrane smaller than 0.2 μm and manufactured using cell culture-grade raw materials.

How should XR NKCryo be stored?

XR NKCryo should be stored at 2–8°C. The recommended shelf life is 12 months under proper storage conditions.

Is XR NKCryo intended for clinical use?

No. XR NKCryo is intended for research use only and is not intended for direct therapeutic, diagnostic or human administration applications.

XR NKCryo - Serum-Free NK Cell Cryopreservation Solution