Question

The Saxitoxin is associated with

• A. PSP
• B. ASP
• C. CFP
• D. DSP

Hint:

Marine Biotoxins & Poisoning Syndromes:
Saxitoxin $\rightarrow$ PSP (Paralytic Shellfish Poisoning).
Okadaic acid $\rightarrow$ DSP (Diarrhetic Shellfish Poisoning).
Domoic acid $\rightarrow$ ASP (Amnesic Shellfish Poisoning).
Brevetoxin $\rightarrow$ NSP (Neurotoxic).

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Marine algal biotoxins and phycotoxins: saxitoxins synthesized by toxic dinoflagellates (Alexandrium, Gymnodinium) block neuronal voltage-gated sodium channels, causing Paralytic Shellfish Poisoning (PSP).
Key Formula or Approach:
\[ \text{Saxitoxin (Algae: } \textit{Alexandrium}\text{)} \xrightarrow{\text{Bioaccumulates in Bivalves}} \text{Blocks Neuronal } \text{Na}^+ \text{ Channels} \implies \mathbf{PSP \text{ (Paralytic Shellfish Poisoning)}} \]

Step 2: Detailed Explanation:
Marine phycotoxin syndromes in seafood safety:
1. Saxitoxin (STX) (A): A potent non-proteinaceous tetrahydropurine neurotoxin produced by toxic marine dinoflagellates (Alexandrium catenella, Gymnodinium catenatum, Pyrodinium bahamense) during red tides. Bioaccumulates in filter-feeding bivalves (mussels, clams). Ingested saxitoxin reversibly blocks voltage-gated $\text{Na}^+$ channels in nerve axons, causing Paralytic Shellfish Poisoning (PSP) (numbness, respiratory paralysis).
2. ASP (Amnesic): Domoic acid (from diatom Pseudo-nitzschia).
3. DSP (Diarrhetic): Okadaic acid (from dinoflagellate Dinophysis).
4. CFP (Ciguatera): Ciguatoxin.

Step 3: Final Answer:
Therefore, Saxitoxin is associated with PSP, matching option (A).