Start with viability, DNA synthesis, nucleic-acid labeling or human-antibody internalization, then select a dye channel. Each workflow has its own sample and interpretation requirements.
23 products
Product selection
Select the experimental endpoint before the channel. Viability, EdU, nucleic-acid labeling and antibody internalization each require their own preparation, sequence and controls.
For support, include: Experimental endpoint, cell or nucleic-acid sample, downstream fixation/permeabilization and detection channel
Workflows and controls
Cell-Life: stain viability before fixation and permeabilization
Cell-Life is an amine-reactive fixable viability dye. Compromised cells expose more intracellular protein sites and stain more strongly.
Use a suitable BSA- and serum-free staining buffer because these proteins consume amine-reactive dye. Confirm reconstitution and working amount for the purchased color and pack.
Stain unfixed cells for viability and wash before surface-antibody staining or the applicable fixation/permeabilization workflow. Introduce protein-containing downstream buffers after washing.
Use unstained and known live/dead samples to establish populations and check retained separation after fixation. Do not infer original viability from staining already permeabilized samples.
EdU: incorporate into DNA before copper-catalyzed detection
EdU incorporation occurs during DNA synthesis in living cells. This series uses copper-catalyzed azide–alkyne detection without a separate BrdU-style DNA-denaturation step.
Set the EdU pulse for the cell type and study window and retain a no-EdU control. Then fix, wash and permeabilize before preparing fresh click solution as instructed.
Check copper-reaction compatibility with GFP, PE and PE tandems. Use a validated immunostaining order and do not transfer compatibility claims from other copper-protected formulations to this kit.
Calculate EdU-positive fractions against nuclear counts or a total-cell gate, matching pulse and acquisition settings. EdU reports DNA synthesis during the window, not viability directly.
Label IT does not require preintroduced amino or click handles. Control labeling through nucleic-acid quality, reagent input and incubation while retaining downstream function.
Use nuclease-free materials and check purity and salt. Use reaction buffer at 1× final concentration, add labeling reagent last and keep it below 20% of the reaction volume.
The Qihe manual gives a 1–3 hour reference reaction at 37°C. Compare input or time series, then assess purified signal and function.
Choose ultrafiltration or another purification method for nucleic-acid length. Remove free reagent, then assess integrity, recovery and hybridization, expression or delivery. Validate membrane retention and recovery for short fragments.
pH630 anti-human: distinguish binding, uptake and acidification
Confirm human-antibody suitability and labeling conditions in the dedicated instructions. Signal increases in acidic compartments and depends on uptake, local pH and antibody binding.
Verify target binding before and after labeling, using target-negative samples and matched antibody amounts. Fixation or permeabilization can change acidic compartments and the readout.
Interpret signal with time courses, intracellular localization and acidification controls. Fluorescence changes alone do not quantify absolute uptake or demonstrate degradation.
These papers and manufacturer methods are selected for the current product use. Their reagents, conditions and parameters belong to the reported systems, not to measured Qihe product performance or universal operating conditions.
Amine reactive dyes: an effective tool to discriminate live and dead cells in polychromatic flow cytometry
Perfetto SP, Chattopadhyay PK, Lamoreaux L, et al. · Journal of Immunological Methods · 313(1–2):199–208 · 2006
Examines titration, live/dead separation and post-fixation detection with amine-reactive viability dyes, informing control design for fixable staining.
A chemical method for fast and sensitive detection of DNA synthesis in vivo
Salic A, Mitchison TJ. · PNAS · 105(7):2415–2420 · 2008
EdU incorporation is followed by fixation, permeabilization and fluorescent-azide CuAAC detection without BrdU-style DNA denaturation. EdU’s terminal alkyne is not a conventional copper-free SPAAC partner; the paper does not validate Qihe kit compatibility with GFP or PE.
Explains the effects of copper-catalyzed EdU detection on GFP, PE and PE tandems and the importance of staining order. This is conventional Click-iT guidance; its formulation, doses and compatibility conclusions for other labels do not replace Qihe-kit validation or imply Plus-series compatibility.
Label IT direct chemical labeling and purification of nucleic acids
Mirus Bio · Label IT Nucleic Acid Labeling Kit · ML002
Manufacturer background on direct chemical labeling of existing DNA/RNA, labeling density and purification recovery. Manufacturer catalog numbers, formulation and doses are not Qihe kit specifications; check recovery for short fragments.
Fc receptors and target binding in antibody internalization
Jin H, et al. · Oncoimmunology · 10(1):1958590 · 2021
Uses pHrodo-labeled avelumab and variants to assess Fcγ-receptor and PD-L1 contributions, informing background controls for anti-human screening. It does not study the binding mechanism or compatibility of Qihe QH-17-1003.
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Product manual
Product use, preparation, operating conditions and storage.
Spectra and measurement conditions
Spectra, measurement conditions and detection settings for the exact catalog number.
Certificate of analysis (CoA)
Lot-specific test results. Include the lot number from the vial.
Safety data sheet (SDS)
Handling, storage and emergency response information.
Frequently asked questions
Why must Cell-Life viability staining precede fixation/permeabilization?
Compromised cells expose more intracellular protein sites and acquire stronger amine-reactive labeling. Fixation/permeabilization first changes that distinction. Stain and wash unfixed cells before downstream processing, using known live/dead references.
Can Cell-Life staining use FACS buffer containing BSA or serum?
During staining these proteins consume amine-reactive dye, so use an instruction-supported BSA- and serum-free buffer. After staining and washing, introduce the buffers required by downstream antibody staining or fixation/permeabilization.
Can EdU detection be performed directly in live cells or use BrdU denaturation steps?
EdU incorporation occurs during DNA synthesis in living cells. This kit’s copper-catalyzed detection follows fixation, washing and permeabilization, without an additional BrdU-style DNA-denaturation step. Include a no-EdU control and choose the pulse for the study window.
Can EdU be combined directly with GFP, PE or PE tandems?
Validate compatibility of the copper reaction with these signals and use a verified immunostaining order. Compatibility of another copper-protected formulation does not transfer to this kit. EdU positivity reports DNA synthesis during the pulse, not viability directly.
Does Label IT require amino or click handles on DNA/RNA first?
This kit chemically labels existing DNA/RNA without requiring those preintroduced handles. Use its dedicated buffer and addition order, compare input/time series, then remove free reagent and validate downstream function.
Can short nucleic acids use the same ultrafiltration method as long DNA?
Length affects membrane retention and recovery. Validate the membrane or use purification suited to fragment length. After removing free label, assess integrity, recovery and hybridization, expression or delivery; total fluorescence does not replace those measures.
Can pH630 anti-human label any antibody species or fragment?
Confirm human-antibody suitability in the dedicated instructions and provide subclass, intact/fragment format and formulation. The anti-human name does not establish universal compatibility, and the reagent does not use a free TFP/NHS-dye labeling recipe.
Does stronger pH630 signal demonstrate antibody degradation?
Signal depends on binding, uptake and local pH. Interpret it with time courses, intracellular localization and acidification controls; fixation/permeabilization can also change the readout. Fluorescence changes alone neither quantify absolute uptake nor demonstrate degradation.
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