Bacterial Endotoxin Testing

Bacterial endotoxin is a complex of lipopolysaccharide (LPS) and protein in the cell wall of gram-negative bacteria, which is released when the bacteria die or autolysis. A large amount of endotoxin enters the bloodstream and causes a febrile reaction - a "pyrogenic reaction". If endotoxin enters and collects in the blood in large quantities and exceeds the clearance capacity of the body's self-defense system, endotoxemia of different degrees may result. Therefore, biological products, pharmaceuticals for injection, chemicals, radiopharmaceuticals, antibiotics, vaccines, dialysis solutions and other preparations, as well as medical devices (such as disposable syringes and implantable biological materials) must be tested for bacterial endotoxin before use.

3D image of bacterial endotoxinFig.1 3D image of bacterial endotoxin

Our Services

Different samples need to find the corresponding interfering factors, find the type of interfering effect, find the method to eliminate the interference, go through method validation, determine the method, and then perform daily testing. To ensure the quality of your injectable drug formulations, medical devices, raw materials, excipients, water, water for injection, and APIs, CD Formulation's experts offer endotoxin detection and control testing. Your testing is performed for USP <85> bacterial endotoxin testing and USP <161> infusion and infusion components. Endotoxin testing requirements are specified for similar medical devices, including those that come into direct contact with blood or cerebrospinal fluid.


We perform endotoxin method validation for each product and/or formulation. Validation or inhibition and enhancement (I/E) testing ensures that the sample does not interfere with the method, which could result in false positive or false negative data.

Validation also ensures proper sensitivity, diluent selection, and dilution factors.

Endotoxin limits are based on formulation, hourly dose, route of administration, and average patient weight, but may also include trend data and monograph specifications.

Service Flow

Service Flow of CD Formulation for Bacterial Endotoxin Testing

Frequently Asked Questions

How to pretreat the insoluble water donor?

The corresponding solvent can be selected according to the characteristics of the test itself, such as dimethyl sulfoxide, ethanol, etc. Corresponding solvents, need to be verified without interference effect and its own endotoxin content.

How many times does the method applicability study need to be conducted?

When establishing endotoxin screening methods for injectable drugs and biological products, it is necessary to use two multiple reagent manufacturers at the same time, and at least three batches of samples of each species for interference testing.

How to Contact Us?

If you have a requirement about our services, please contact us by phone or email, our colleagues will reply to you within three working days.

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Please note: Our products and services are not intended to be used directly in diagnostic or therapeutic procedures.
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