While often referred to as a single potent neurotoxin, Saxitoxin (STX) is actually the parent compound for a family of more than 50 related toxins known as congeners. These analogs vary in toxicity and are produced by harmful algal blooms and toxin producing organisms like Alexandrium and Pyrodinium bahamense. Because these congeners often occur together in complex mixtures, effective detection methods must be able to account for this entire class of PSP toxins to accurately measure the total threat to public health.

Saxitoxin is classified as a Schedule 1 substance under the Chemical Weapons Convention, the highest level of restriction, alongside chemical warfare agents. This is because it attacks the nervous system with extreme efficiency, causing rapid muscle paralysis and respiratory failure. Consequently, governments globally, including the United States, mandate rigorous monitoring of toxin levels to protect public health and prevent the misuse of this biological agent.

PSP is caused by consuming shellfish harvested from waters containing specific dinoflagellates, such as Alexandrium species or Pyrodinium bahamense. During harmful algal blooms (often called red tide), these toxin producing organisms multiply rapidly. Shellfish are filter feeders; they strain these algae from the water, concentrating Saxitoxin and related PSP toxins in their tissue at levels much higher than the surrounding water. Because the toxins are invisible and odorless, rigorous detection methods are required to identify these spikes in toxin levels before the PSP toxins can affect humans.

No. Saxitoxin and its related congeners are exceptionally heat-stable, meaning they are not destroyed by boiling, steaming, or frying. The toxin remains active inside the tissue of shellfish harvested even after thorough cooking or freezing. Consequently, the only way to prevent Paralytic Shellfish Poisoning (PSP) is to screen for shellfish contamination before the product ever reaches the dinner plate.

Historically, the mouse bioassay was the gold standard for measuring total toxicity, but it relies on live animals and involves significant delays. PSP Alert advances detection methods by using antibodies to target the potent neurotoxin directly, eliminating ethical concerns and the need for hazardous chemicals. While the MBA measures biological effects, our rapid test provides immediate data on toxin levels, allowing harvesters to manage shellfish contamination risks proactively rather than waiting for lab results.

Advanced lab methods like HPLC provide a precise chemical fingerprint but require expensive equipment and time. Our PSP Alert test is designed to bridge the gap, offering a portable solution that correlates with these high-tech detection methods. It allows operators to detect PSP toxins in shellfish harvested remotely—from butter clams to oysters—providing the speed needed to respond to harmful algal blooms before products leave the site.