Question

Aflatoxins are:

• A. Heat sensitive
• B. Carcinogenic
• C. Non-toxic
• D. Destroyed by drying

Hint:

Aflatoxin \( B_1 \) is the most toxic and carcinogenic of all aflatoxins.
Remember that aflatoxin contamination is majorly associated with warm and humid storage conditions, typically affecting peanuts, corn, and tree nuts.

Answer 1

The Correct Option is B

Step 1: Understanding the Question:
The question asks to identify the correct biological or physical characteristic of aflatoxins from the given options.
Aflatoxins are naturally occurring mycotoxins produced by certain molds of the genus Aspergillus, notably Aspergillus flavus and Aspergillus parasiticus.

Step 2: Key Formula or Approach:
The approach involves analyzing the properties, toxicological profile, and stability of aflatoxins in food science and toxicology.
By examining how these toxins react to physical processes (like heating and drying) and their physiological effects on human and animal health, the correct characteristic can be deduced.

Step 3: Detailed Explanation:
The toxicity and stability details of aflatoxins are described below:

• Carcinogenicity: Aflatoxins are widely recognized as extremely potent carcinogens.
In particular, Aflatoxin B1 (\( AFB_1 \)) is classified by the International Agency for Research on Cancer (IARC) as a Group 1 human carcinogen.
Long-term exposure to even microgram levels of aflatoxins is highly associated with the development of hepatocellular carcinoma (liver cancer).

• Heat Stability: Aflatoxins are highly thermal-stable compounds.
They have melting points of over $260^{\circ}\text{C}$ and are not destroyed by pasteurization, boiling, baking, or cooking processes.
Therefore, they are not "heat sensitive" (eliminating Option A).

• Effect of Drying: While proper drying of agricultural commodities (like groundnuts and maize) is crucial to prevent further mold growth, it does not destroy already formed aflatoxins.
Thus, they are not "destroyed by drying" (eliminating Option D).

• Toxicity Profile: Aflatoxins are highly toxic, inducing both acute liver necrosis (aflatoxicosis) and chronic health effects, making Option C ("Non-toxic") completely incorrect.

Step 4: Final Answer:
Thus, the most defining and dangerous property of aflatoxins is that they are highly carcinogenic.