The following is responsible for spoilage of peanuts :

Question

Accepted Answer

The correct option is 3: Aflatoxin

Aflatoxin is the correct answer because it is a potent, naturally occurring toxin produced by certain species of the mould *Aspergillus*, particularly *Aspergillus flavus* and *Aspergillus parasiticus*. These moulds commonly infect crops before harvest or during storage, especially under conditions of high temperature and humidity, which peanuts (groundnuts) are highly susceptible to due to their composition and growth habit underground. When these moulds grow on the peanuts, they cause visible spoilage, manifesting as dusty or fuzzy mould growth and discoloration, but more critically, they produce aflatoxins. The most common and dangerous form is Aflatoxin B1, which is classified as a potent human liver carcinogen. The presence of aflatoxin is therefore a major food safety and spoilage issue globally, as it renders the crop unsafe for both human and animal consumption. The contamination is a critical post-harvest issue worldwide, leading to strict regulatory testing to ensure that the levels of this mycotoxin are kept to an absolute minimum to prevent serious food poisoning and long-term health risks associated with liver damage and cancer.

The incorrect option is 1: Oxalate

Oxalates are naturally occurring compounds, formally oxalic acid, found in many plants, including certain nuts, leafy greens, and vegetables such as spinach. They are not agents of food spoilage, but rather are categorized as anti-nutrients because they bind with essential minerals, such as calcium, in the digestive tract. This binding action can potentially reduce the bioavailability and absorption of these minerals in the human body. Furthermore, in susceptible individuals, the formation of insoluble calcium oxalate crystals can contribute to the development of kidney stones. However, oxalates are an inherent, stable chemical component of the food itself and do not initiate the decomposition, mould growth, or decay process that is defined as spoilage in peanuts.

The incorrect option is 2: Goitrogens

Goitrogens are substances that interfere with the normal functioning of the thyroid gland, primarily by inhibiting the uptake of iodine, which can, over time, lead to an enlarged thyroid gland, or goiter. They are chemical compounds that are famously present in cruciferous vegetables like cabbage and broccoli. Like oxalates, goitrogens are a concern for nutritional and dietary health due to their physiological effect on the consumer. They are not pathogenic microorganisms, nor are they toxins produced by spoilage agents such as fungi or bacteria. Therefore, goitrogens do not cause the physical decomposition or decay that constitutes the spoilage of the peanut kernel itself.

The incorrect option is 4: Botulism toxin

Botulism toxin is a potent neurotoxin produced by the anaerobic bacterium *Clostridium botulinum*. This type of toxin contamination is classically associated with very specific food preservation failures, primarily involving improperly canned, low-acid, and oxygen-free (anaerobic) foods. The environmental conditions required for *C. botulinum* to multiply and produce its deadly toxin—namely, a lack of oxygen, high moisture, and low acidity—are generally not met in the spoilage of peanuts. Peanuts are typically stored as a dry commodity that is continuously exposed to air (aerobic environment). Consequently, the spoilage of dry commodities like peanuts is overwhelmingly dominated by mould growth and the associated mycotoxins like Aflatoxin, not the bacterial toxin responsible for botulism.