XR InstantSelect - hESC/iPSC Selection & Aggregate Passaging Reagent

Description

Routine passaging of human embryonic stem cells and induced pluripotent stem cells requires careful control of dissociation time and aggregate size. Excessive exposure to enzymatic dissociation reagents or overly vigorous pipetting can disrupt colonies, create aggregates that are too small, and increase cell stress. At the same time, cultures containing spontaneously differentiated areas may require additional manual selection before the undifferentiated population can be transferred.

XR InstantSelect hES/iPS Cell Aggregate Dissociation and Selection Reagent is an enzyme-free hESC and iPSC passaging reagent designed to combine rapid aggregate dissociation with selective detachment of undifferentiated cells. Its optimized ion-chelation approach supports non-enzymatic cell dissociation without the use of human- or animal-derived components or added protein.

During the recommended protocol, colonies are exposed to InstantSelect for 1 minute, the working solution is aspirated, and the plate is incubated for an additional 3 minutes. Gentle tapping and limited pipetting then release the undifferentiated portion as cell aggregates approximately 100–200 μm in diameter, while differentiated regions can remain attached to the culture surface.

This integrated dissociation and selection workflow is intended to simplify routine human pluripotent stem cell passaging, reduce unnecessary mechanical manipulation, and help researchers obtain appropriately sized hESC or hiPSC aggregates for subsequent culture.

Specifications

Features

• Integrated dissociation and selection: selectively releases undifferentiated hESC or hiPSC colonies while differentiated areas can remain attached to the culture vessel.

• Enzyme-free passaging: supports non-enzymatic human pluripotent stem cell dissociation without proteolytic digestion.

• Rapid protocol: uses a 1-minute reagent exposure followed by a 3-minute residual incubation.

• Aggregate-based transfer: produces cell clumps with a recommended diameter of approximately 100–200 μm.

• Limited mechanical manipulation: colonies can be released by gentle tapping followed by only one or two pipetting steps.

• Protein-free formulation: contains no added protein and no added human- or animal-derived components.

• Designed for hPSC culture: intended for routine passaging of human embryonic stem cells and human induced pluripotent stem cells.

• Convenient storage: supplied as a ready-to-use working solution that can be stored at room temperature.

How XR InstantSelect Works

XR InstantSelect uses an optimized ion-chelation mechanism to weaken cell-to-cell and cell-to-surface interactions without enzymatic digestion. The short contact step initiates colony dissociation, while the residual reagent remaining on the cell layer continues the process during the subsequent 3-minute incubation.

When the plate is gently tapped, undifferentiated colony regions detach as aggregates suitable for transfer. Spontaneously differentiated areas may remain attached, enabling selective collection of the undifferentiated portion during routine hESC or iPSC passaging.

Rapid 1-minute exposure and 3-minute residual incubation workflow.

Selective Detachment of Undifferentiated Cells

Unlike a general-purpose cell dissociation reagent that releases the entire culture indiscriminately, InstantSelect is designed to support selective detachment. After treatment, the undifferentiated portion can be collected by gentle tapping, while visibly differentiated areas can remain on the plate for exclusion from the transferred population.

Selective collection of undifferentiated hPSC colonies during passaging.

Recommended Passaging Protocol

1. Remove the spent culture medium from the hESC or hiPSC culture.
2. Wash the culture with calcium- and magnesium-free DPBS to remove residual medium and cellular debris.
3. Add 1 mL of XR InstantSelect to each well of a 6-well plate.
4. Incubate the plate at 37°C for 1 minute.
5. Aspirate the InstantSelect working solution immediately after the 1-minute exposure.
6. Return the plate to the 37°C incubator for an additional 3 minutes. Residual solution on the cell surface completes the aggregate dissociation step.
7. Add 1 mL of culture medium to the treated well.
8. Gently tap the edge of the plate to release the undifferentiated cell layer as small aggregates.
9. Pipette gently one or two times to obtain aggregates approximately 100–200 μm in diameter.
10. Transfer the resulting cell aggregates according to the laboratory’s established hESC or hiPSC culture procedure.

Passaging Workflow Comparison

Applications

XR InstantSelect is designed for human pluripotent stem cell laboratories that require a rapid, enzyme-free method for routine aggregate passaging. Its selective dissociation workflow is particularly relevant when researchers need to transfer undifferentiated colonies while minimizing the carryover of visibly differentiated areas.

• Routine hiPSC passaging: non-enzymatic dissociation of human induced pluripotent stem cell colonies into transferable aggregates.

• Routine hESC passaging: aggregate-based transfer of human embryonic stem cells without proteolytic enzymes.

• Human pluripotent stem cell maintenance: regular hPSC culture workflows requiring controlled colony breakup rather than complete single-cell dissociation.

• Selective undifferentiated-cell collection: separation of detachable undifferentiated colony regions from differentiated areas that remain attached.

• Clump passaging: preparation of hESC or hiPSC aggregates approximately 100–200 μm in diameter.

• Colony passaging: transfer of pluripotent stem cell colonies using gentle tapping and limited pipetting.

• Enzyme-free stem cell culture workflows: replacement of proteolytic dissociation steps where aggregate-based passaging is preferred.

• Reduction of differentiated-cell carryover: routine culture workflows in which visibly differentiated regions need to be excluded from the transferred cell population.

• Expansion before downstream research: passaging of hESCs or hiPSCs before laboratory-defined characterization, differentiation, gene-editing, disease-modeling, or other research workflows.

• Standardized PSC handling: laboratories seeking a short, defined contact-and-incubation sequence for routine human pluripotent stem cell passaging.

When to Use Aggregate-Based hPSC Passaging

Human pluripotent stem cells may be transferred either as aggregates or as single cells, depending on the established culture system and downstream objective. XR InstantSelect is specifically intended for aggregate-based passaging rather than complete single-cell dissociation.

This format is suitable when the laboratory protocol calls for maintaining cell-to-cell contact within small hESC or hiPSC clumps. The recommended 100–200 μm aggregate range provides a practical visual target during passaging and helps prevent unnecessary over-dissociation.

For workflows that specifically require a uniform single-cell suspension, researchers should use a dissociation method validated for that purpose instead of extending the InstantSelect incubation or applying excessive mechanical pipetting.

FAQ

Important Notice

This product is supplied for research use only. Culture response and optimal handling may vary with cell line, passage history, colony density, culture matrix, medium, and laboratory conditions. Researchers should validate the passaging procedure within their established human pluripotent stem cell culture system.