Products Description
Basic Structure
The COVID-19 antigen test kit is an in vitro diagnostic product that quickly determines infection by detecting characteristic proteins (antigens) on the surface of the virus.
The kit usually consists of three parts:
Test reagent card: The plastic cartridge is embedded with test paper strips and is the core testing component.
Sample extraction solution (buffer): Used to process collected samples, providing appropriate pH and ionic intensity to ensure normal antigen-antibody reactions.
Sampling swab: Used to collect nasapharyngeal swab or oropharyngeal swab samples.
Technical Principle
The reagent uses a double-antibody sandwich immunochromatography method. Simply put, the reagent contains two types of antibodies that can specifically recognize the coronavirus N protein (nucleocapsid protein): one labeled on colored particles, and the other fixed on the T-line (detection line) on the test paper. When the sample contains viral antigens, they sequentially bind to these two antibodies, forming an "antibody-antigen-antibody" complex, which clusters and develops color on the T-line, forming "two lines."
Why choose N protein as the detection target
The novel coronavirus contains four structural proteins: S, E, M, and N. Among them, N protein has the highest content in the virus and has fewer mutations compared to S protein. Choosing N protein as a target not only helps improve detection sensitivity but also reduces the risk of missed detection caused by viral variants.
The main use of antigen testing is rapid screening. Compared to nucleic acid testing, antigen testing has very significant advantages:
- Results in 15 minutes, no laboratory equipment required.
- Easy to operate; ordinary people can complete the self-test with simple guidance.
- The cost is relatively low, making it suitable for large-scale use
- Highly portable, it can be used anywhere, including at home or in non-medical institutions.
design Concept
Rapid Detection: 15-minute window period
Traditional nucleic acid testing requires amplification steps, taking at least 4-6 hours. Antigen detection uses immunochromatography principles: after the sample is dropped, the liquid flows from one end of the test paper to the other under the capillary pull of the nitrocellulose membrane, completing the entire reaction within 10-15 minutes. This "point-of-care testing" (POCT) concept expands testing scenarios from laboratories to communities, homes, and anywhere in need.
Easy operation: self-test-friendly design
The antigen test kits are designed to allow non-professionals to operate accurately. A typical operating process requires only three steps:
Sampling: Swab swab rotated inside the nasal cavity (at least 5 times per nasal cavity, no less than 15 seconds)
Processing: Insert the swab into the extraction solution and rotate and squeeze to ensure the sample and buffer mixture are fully mixed
Testing: Add 4 drops of treatment solution to the sample well of the reagent card, read the result after 15 minutes
Our production and equipment
26
years
Our factory was established in 2000, and has long been rooted in the disposable medical consumables industry.
6
rows of 100,000-level purification workshops
Our factory coveres an area of more than 100 acres of two factories, 6 rows of 100,000-level purification workshops for producing, each row of 5000 square meters, a total of 30,000 square meters.
800
EMPLOYEES
Our factory employs more than 800 people, all of whom have received professional medical production training.
Our address
Room 1802, West Tower, Gome Smart City, Guangzhou City, Guangdong Province
Phone Number
(86)-15083947956
Sales45@chengwumedical.com
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