The brand PYROSTAR™ of the company "Wako" specialises in reagents for the detection of bacterial endotoxins. Bacterial endotoxins, originating from the cell walls of the Gram-negative bacteria, are one of the main and most powerful sources of contamination in pharmaceuticals.
What are known as bacterial endotoxins are Lipopolysaccharides (LPS) that form part of the external membrane of Gram-negative bacteria. These lipopolysaccharides have a toxic effect in mammals, producing episodes of fever and septic shock that could result in death. Therefore, the pharmaceutical industry demands methods for the control of endotoxins in finished products and in all the reagents and supplies used in medicine production which guarantee that these products and supplies do not contain endotoxins at dangerous levels. Similarly, research with pharmaceuticals necessitates this control in products before carrying out clinical and pre-clinical tests. As the LAL method is the recommended one by the pharmaceutical authorities for determining endotoxins, this test is the one used by researchers. With the goal of providing pharmaceutical companies and other biomedical branches with reagents and accessories with which the LAL test can be conducted, Wako has launched the brand PYROSTAR™.
One of the most important accessories of the brand PYROSTAR is the Toxinometer®, a photometric instrument designed especially to measure the change in the turbidity that is produced upon mixing a sample which may contain endotoxins when mixed with the reagents of the Limulus test. The name of the "Limulus" test comes from the fact that this test is conducted with an amebocyte lysate from the hemolymph of the Limulus Polyphemus crab, which is why it is known as the Limulus test or the LAL test by the initials of the English name Limulus amebocyte lysate.
Among the other products which the brand PYROSTAR™ uses, we encounter the tests that measure the presence of endotoxins by different methods of detection that have been developed over the years. The tests for the determination of endotoxins are the ones that are described below:
Carboxymethylated curdlan is added in these Limulus tests to eliminate the interference that is produced by β-1,3-glucans in the test. Compounds that are of the type of β-1,3-glucans also form part of the cell wall of the bacteria and are capable of activating another chain of reactions that are different from those activated by lipopolysaccharides. However, they separate out the proteins which form a gel that is indistinguishable from the characteristic gel of the LAL test.
Curdlan is a β-1,3-glucan and if it is added in excess, it makes other glucans, which may be found in the samples, not interfere with the measurements. In the past, in order to add the carboximetilated curdlan to the reagents of the LAL test, the carboximetilated curdlan used to be mixed as a buffer. However, nowadays, it has been achieved to lyophilise it together with the rest of the reagents. Therefore, for instance, a reagent specific for endotoxins is already obtained for the LAL test by reconstructing the reagent contained in the PYROSTAR™ ES-F vials with water for the lysate test (LAL Reagent Water).
The other reagents you can find in the catalogue of the brand PYROSTAR™ which are useful for the detection of endotoxins in the research of medicines are listed below:
|Kit of 4 PYROSTAR™ ES-F (2 ML) with CSE||Kit of 100 PYROSTAR™ ES-F (5.2 ML) without CSE|