Yes, but it is recommended to stain Annexin V separately from other antibodies. For example, when simultaneously labeling lymphocytes with Annexin V, PI, and CD3 or CD8, you can first incubate the cells in PBS to label CD3/CD8, then wash off the primary antibody, and finally stain with Annexin V in binding buffer (containing calcium ions).

Yes, the Annexin V assay is primarily used to detect early apoptosis; in the mid‑early stages, a decrease in mitochondrial membrane potential is often observed, which can be assessed using methods such as JC‑1 staining. In the mid‑late stages, activation of apoptotic signaling pathways occurs, and the level of Caspase‑3 activation is typically measured. In the late stage, DNA fragmentation within the nucleus becomes prominent, and this is commonly detected using the TUNEL assay.

False-positive or false-negative results may arise from excessively long processing times, overly high assay concentrations, and poor initial cell viability, among other factors.

The upper-left quadrant typically reflects non-apoptotic cell death triggered by abrupt environmental changes resulting from improper handling—such as excessive mechanical force, prolonged incubation times, or overly high concentrations of stimulatory agents. To address this, it is necessary to optimize the concentration and time gradients of the treatment, as well as refine the protocols for cell culture and cell dissociation.

Do not overseed cells: When seeding cells in the logarithmic growth phase, maintain a cell density no greater than 1 × 10^6 cells/mL. ⁶ …to prevent apoptosis induced by the cells themselves during culture, rather than by external experimental conditions; avoid over‑digestion, as excessive digestion can lead to phosphatidylserine (PS) exposure on the cell surface, yielding false‑positive results; handle cells with utmost care—excessive force during cell collection may damage the plasma membrane, exposing its phospholipid layer and enabling Annexin V binding, which can result in false positives. Therefore, when working with adherent cells, proceed gently and minimize any artificial mechanical injury.

Because apoptotic cells may detach from the culture dish and remain suspended in the culture medium, it is necessary to collect the supernatant, centrifuge it to pellet the cells, and combine these with the cells released by trypsinization; otherwise, the measured proportion of apoptosis may be underestimated.

Because apoptosis is a rapid process, it is recommended to analyze samples within one hour after staining. PI is highly time‑dependent; labeling with PI increases cytotoxicity, particularly when detecting early apoptosis. Prolonged incubation not only widens the separation of cell populations on the flow cytometer but also significantly amplifies measurement errors; therefore, analysis should be performed within one hour.

Advantages:

1. This method is widely adopted, easy and rapid to perform, and can complete the assay within 45 minutes—four times faster than the classic Lowery method and even more…

2. It is resistant to the effects of common concentrations of detergents, urea, and other substances, exhibiting strong anti-interference performance.

3. The coefficient of variation for detecting different protein molecules is also significantly lower than that of the Coomassie Brilliant Blue method.

4. Accurate, highly sensitive, and with excellent reagent stability. The BCA assay exhibits a strong linear relationship over a broad concentration range of 20–20 µg/mL, while its micro‑volume detection range is 0.5–10 µg/mL.

5. Economical and practical: in addition to test tubes, measurements can be performed directly in microplate wells, significantly reducing the amounts of sample and reagents required.

Disadvantages:

1. May be affected by chelating agents (EDTA, EGTA) and high-concentration reducing agents (DTT, β-mercaptoethanol);

2. The reaction requires incubation in a constant-temperature water bath for 30 minutes or longer.

It must not be mixed with any other antibiotics except the streptomycin–tetracycline double‑resistance formulation.

Li Ji Bio’s Quick Cell Mycoplasma Eradication Reagent (1000X) effectively inhibits mycoplasma DNA replication by suppressing the activity of mycoplasma DNA gyrase, thereby eliminating mycoplasmas at the genetic level. This ensures that cells are completely free from mycoplasma contamination, safeguarding the reliability of experimental results.

It is primarily used to eliminate mycoplasma from cells, serum, and culture media, with the entire process taking only 3–5 days. This product effectively eradicates most mycoplasma species while being non‑toxic to the cells themselves.

Li Ji has validated over a hundred cell lines, including mouse embryonic stem cells and iPS cells, human embryonic stem cells and iPS cells, HEK293, HeLa, HepG2, HCT116, COS-7, Vero, Huh-7, MDCK, PANC-1, SW620, U2OS, MCF-7, MRC-5, NIH-3T3, CCC-ESF, CHO-S, CHO-K1, CHO-DG44, H295R, HL60, K562, MDA-MB-231, SP20, T47D, BM, and BV2, among others.

The cryopreservation kit for living tissues enables vitrification-based cryopreservation, effectively preserving tissue morphology, structure, and function. Tissue viability can be efficiently maintained across multiple levels, from the molecular to the tissue level. Achieving organizational vitality Long-term, efficient preservation , suitable for animal tissues and Cryopreservation of tumor tissue . The live tissue revival kit is used in conjunction with the cryopreservation kit for immediate revival, Can be highly efficient Revival preserves tissue viability. 。

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