Human Hepatitis B Virus preS1 Antigen (HBV preS1-Ag) ELISA Kit — Technical Comparison & Buying Guide for Virology and Hepatology Researchers
HBV preS1: The 108-Amino-Acid Domain That Decides Whether the Virus Gets In
Hepatitis B virus preS1 antigen (HBV preS1-Ag) is the N-terminal 108-amino-acid domain of the large hepatitis B surface antigen (L-HBsAg). It is the viral attachment protein — the domain that binds the sodium taurocholate co-transporting polypeptide (NTCP) receptor on hepatocytes and determines host range and infectivity. PreS1 is exposed on the surface of the complete virion (Dane particle) and is not present on subviral particles, making it a marker of actively replicating, infectious virus rather than just antigenemia.
This distinction matters enormously. HBsAg can persist as subviral particles even when viral replication is suppressed. PreS1, in contrast, is found only on complete virions and is therefore a direct marker of viral replication and infectivity. Persistent preS1 positivity indicates circulating virus capable of infecting hepatocytes — a critical distinction in the era of nucleoside analogue therapy, where HBsAg may remain positive but infectivity is dramatically reduced.
Abbkine's Human Hepatitis B virus pre S1 antigen (HBV preS1-Ag) ELISA Kit (KTE62719) provides a sensitive, specific tool for detecting this critical marker of HBV replication. Here's how researchers across different fields are putting it to work.
Why Traditional HBV Detection Methods Fall Short
| Method | Limitation |
|---|---|
| HBsAg ELISA | Detects subviral particles — cannot distinguish actively replicating virus from non-infectious antigenemia |
| HBV DNA PCR | Gold standard for viral load, but requires specialized equipment, expertise, and higher cost |
| HBeAg ELISA | Marker of replication, but can be negative in precore mutant infections with high viral load |
PreS1 antigen fills a critical gap: it is a protein marker of complete virions that can be measured by standard ELISA in any lab with a plate reader, providing replication-related information without the cost and complexity of PCR.
Abbkine KTE62719: Engineered for preS1-Specific Precision
The kit uses a double-antibody sandwich ELISA format with a pre-coated capture antibody and a detection antibody, both validated for exclusive binding to human HBV preS1 antigen. The colorimetric detection at 450 nm provides quantitative or semi-quantitative results on a standard microplate reader.
Key Specifications
| Parameter | KTE62719 |
|---|---|
| Format | Double-antibody sandwich ELISA |
| Detection Method | Colorimetric (450 nm) |
| Sample Types | Serum, plasma, other biological fluids |
| Reactivity | Human |
| Assay Duration | Standard ELISA protocol |
Head-to-Head Comparison: KTE62719 vs. Legacy Methods
| Feature | Abbkine KTE62719 | HBsAg ELISA | HBV DNA PCR |
|---|---|---|---|
| Detects Complete Virions | Yes (preS1 on virions only) | No (subviral particles too) | Yes (viral genome) |
| Replication Marker | Yes | Indirect | Yes (gold standard) |
| Equipment Required | Standard plate reader | Standard plate reader | Real-time PCR instrument |
| Cost | Affordable | Affordable | High |
| Throughput | 96-well plate | 96-well plate | Moderate |
| Detects Precore Mutants | Yes | No | Yes |
Why Choose Abbkine KTE62719?
- Markers of Active Replication: PreS1 is found only on complete virions — a direct marker of infectious virus
- Complements HBV DNA Testing: Provides replication-related information without PCR cost and complexity
- Detects Precore Mutants: Unlike HBeAg, preS1 remains detectable in precore mutant infections
- Standard Equipment: Colorimetric readout on any microplate reader — no specialized instrumentation
- Broad Sample Compatibility: Validated for serum, plasma, and other biological fluids
- Complete Kit: Pre-coated plate, standards, detection antibodies, and all buffers included
Who Should Buy This Kit?
✅ Buy KTE62719 if you:
- Study HBV replication and infectivity
- Research nucleoside analogue therapy response and antiviral resistance
- Investigate precore mutant infections
- Work on HBV entry mechanisms (NTCP receptor binding)
- Study hepatocellular carcinoma (HCC) risk in HBV patients
- Need a cost-effective alternative to HBV DNA PCR for replication monitoring
- Require replication-specific markers — not just HBsAg antigenemia
- Want a complete, ready-to-use kit for high-throughput screening
❌ Consider alternatives if you:
- Only need HBsAg screening (use a standard HBsAg ELISA)
- Require absolute viral load quantification (use HBV DNA PCR)
- Work with non-human samples — check Abbkine's other offerings
📌 Reference Link: Human Hepatitis B virus pre S1 antigen (HBV preS1-Ag) ELISA Kit — KTE62719
