Why choose HEPES sodium salt for the flow cytometry kit
The flow cytometry kit has extremely strict requirements for the buffer system, and the reason why HEPES sodium salt has become the preferred buffer in this field is mainly based on the following technical advantages.
PH buffering range perfectly adapts to physiological and reaction conditions
The effective buffering range of HEPES sodium salt is pH 6.8-8.2, with a pKa of 7.5 (25 ℃), highly matching physiological pH 7.36. The antigen antibody reaction and enzyme catalyzed luminescence reaction of the flow cytometry fluorescence luminescence method have good activity within this pH range. HEPES sodium salt can stabilize the system pH in the optimal range throughout the reaction process, ensuring high reaction efficiency.
Not chelating metal ions to ensure the integrity of the reaction system
Flow cytometry involves multiple metal ion dependent biological reaction steps, such as antigen antibody binding, enzyme catalyzed reactions, etc. HEPES sodium salt has extremely low metal ion binding ability and does not chelate key cofactors such as Mg ² ⁺, Ca ² ⁺, Mn ² ⁺, etc. In contrast, Tris and phosphate buffering agents have strong metal ion binding abilities, which may interfere with metal ion dependent enzymatic reactions. This characteristic makes HEPES sodium salt an ideal substitute for Tris and phosphates in research involving metal ions.
High optical transparency, does not interfere with fluorescence detection
The core detection signal of flow cytometry is fluorescence intensity. HEPES sodium salt has extremely low absorption in the visible and ultraviolet regions, and high optical transparency. This means that HEPES sodium salt itself does not produce background fluorescence or absorb target fluorescence signals, ensuring a higher detection signal-to-noise ratio.
Strong chemical inertness, does not interfere with immune response
HEPES, with its chemical inertness, temperature stability, and strong buffering capacity, is theoretically the best choice for biochemical compatibility. It can minimize the interference of the buffer solution itself on immune and enzymatic reactions, often resulting in better signal-to-noise ratio. This is crucial for pursuing in vitro diagnostic kits with high sensitivity and specificity.
Low cytotoxicity, protects bioactive components
The flow cytometry kit contains bioactive components such as antibodies, antigens, enzyme markers, etc., which have high requirements for the biocompatibility of the buffer system. The cytotoxicity of HEPES sodium salt is lower than that of traditional buffering agents such as Tris and phosphate, which can better protect the stability and activity of bioactive components in the kit.
Suggestions for selection of HEPES sodium salt raw materials
For manufacturers of flow cytometry kits, the quality of HEPES sodium salt raw materials directly affects the performance of the finished kit. It is recommended to focus on the following quality indicators when selecting raw materials:
|
quality indicator |
Suggested requirements |
Instructions |
|
Main content |
≥99.0% |
The higher the purity, the more stable the buffering capacity, and the better the batch |
|
Water solubility |
Completely dissolved, clear and transparent |
Ensure that the buffer solution is prepared without any residual particles heavy metal |
|
heavy metal |
≤10ppm |
Metal ions may interfere with enzymatic reactions and fluorescence signals |
|
Absorbance(260nm/280nm) |
Low absorbance |
Reflect the content of organic impurities, accurately |
|
Dry weight loss |
≤0.5% |
low moisture content, conducive to long-term storage |
|
Batch consistency |
Batch difference ≤ 1% |
Ensure stable performance of different batches of reagent kits |
Hubei Xindesheng Material Technology Co., Ltd. has been specializing in the research and production of biological buffering agents for more than ten years. HEPES sodium salt products are strictly organized and produced according to the ISO 9001 quality management system, with a main content stable at over 99%. The content of metal ions and organic impurities is strictly controlled, which can meet the strict requirements of buffer raw materials in high-end application scenarios such as flow cytometry kits, cell culture media, and biopharmaceuticals.
The company also provides various biological buffering agents such as Tris, Bicine, Caps, Mops, Taps, EPPS, and Carbopol series products, committed to providing high-quality core raw materials for the IVD in vitro diagnostic industry.
Welcome all reagent kit research and production enterprises to call or write to request technical information and samples.
