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Endotoxin detection must avoid process contamination. Therefore, it is necessary to select glass test tubes witthout endotoxins.
LAL Assay Reagents paired with Control Standard Endotoxin (CSE)

LAL Assay Reagents paired with Control Standard Endotoxin (CSE)

Control Standard Endotoxin (CSE) is a certified secondary endotoxin standard engineered exclusively for the gel-clot limulus amebocyte lysate (LAL) test. It offers a cost-effective, fully regulatory-compliant substitute for primary Reference Standard Endotoxin (RSE).Calibrated and validated against official RSE per pharmacopoeial requirements, CSE features well-defined endotoxin activity units and stable biological reactivity. Its performance perfectly matches the inherent reaction profile of bacterial endotoxins in all gel-clot LAL testing workflows.

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Products Descriptions

Control Standard Endotoxin (CSE) is a certified secondary endotoxin standard engineered exclusively for the gel-clot limulus amebocyte lysate (LAL) test. It offers a cost-effective, fully regulatory-compliant substitute for primary Reference Standard Endotoxin (RSE).Calibrated and validated against official RSE per pharmacopoeial requirements, CSE features well-defined endotoxin activity units and stable biological reactivity. Its performance perfectly matches the inherent reaction profile of bacterial endotoxins in all gel-clot LAL testing workflows.

Control Standard Endotoxin (CSE)

Control Standard Endotoxin for LAL Assay

1. Control Standard Endotoxin Overview

Control Standard Endotoxin (CSE) is extracted from E.coli O111:B4. CSE is an economic alternative to Reference Standard Endotoxin (RSE) in constructing standard curves, validating product and preparing controls in Lyophilized Amebocyte Lysate test. The labeled potency of CSE endotoxinE.coli standard is referenced against RSE. The Control Standard Endotoxin could be used with gel clot assay, kinetic turbidimetric assay or kinetic chromogenic assay as the endotoxin testing standards. The Certificate of Analysis will show the matched Lyophilized Amebocyte Lysate reagent lots.


2. Control Standard Endotoxin Key Parameter

Catalog NumberPotency  (EU/vial)Package
CSE5 to 200 EUseal in glass vial, 10vials/box or Customized Packing according to order quantity


3. Product Feature and Application

Bioendo CSE was labeled by the potency and matched to Lyophilized Amebocyte Lysate reagent lots. Users do not need to do the CSE/RSE ratio assay. Low potency control standard endotoxin is available to avoid lots of steps of dilution to provide convenience for end users.


4. Product Quality Certification:

Control Standard Endotoxin (CSE), extracted from E.coli O111:B4, is an economic alternative to Reference Standard Endotoxin (RSE) in constructing standard curves, validating product and preparing controls in endotoxin test. The potency of CSE is referenced against USP Reference Standard Endotoxin, and labeled in the Certificate of Analysis.

Endotoxin test assay: Lysate reagent and CSE lot number have to be matched.


5. General Overview of Control Standard Endotoxin (CSE) for Gel-Clot Limulus Amebocyte Lysate (LAL) Test

Control Standard Endotoxin (CSE) is a qualified secondary endotoxin standard specifically developed and applied for the gel-clot limulus amebocyte lysate (LAL) test, serving as a cost-effective and fully compliant alternative to the primary Reference Standard Endotoxin (RSE). Calibrated and verified against official RSE in accordance with compendial specifications, CSE possesses definite endotoxin activity units and consistent biological reactivity, which strictly conforms to the reaction characteristics of bacterial endotoxins in gel-clot LAL assay systems.


In the gel-clot endotoxin test methodology, CSE functions as the core standard material for quantitative and qualitative system verification. It is primarily utilized for the establishment of standard endotoxin curves, validation of endotoxin test procedures for pharmaceutical products, medical devices and biological preparations, and preparation of positive controls, negative controls and inhibition/enhancement controls in routine assay operations. Compared with RSE, which is limited in supply and high in cost, qualified CSE exhibits equivalent gelation reactivity, stability and test reproducibility in gel-clot LAL tests, and can completely replace RSE for conventional testing and validation work without compromising test accuracy and reliability.


Prior to formal application in gel-clot assays, CSE must undergo rigorous calibration confirmation to ensure its endotoxin potency is traceable to national or international reference standards, eliminating systematic deviations in gel-clot reaction judgment. During routine testing, serially diluted CSE solutions are used to construct valid standard response ranges, verify the sensitivity of LAL reagents, confirm the absence of test system inhibition or enhancement effects, and ensure the validity of each batch of gel-clot endotoxin test results. As a practical and standardized working standard, CSE is the essential certified reference material for the daily implementation, method validation and quality control of gel-clot endotoxin detection.