Ochratoxin A Overview

Ochratoxins are part of a group of mycotoxins that are secondary byproducts of Aspergillus sp. and Penicillium sp., arising from an isocoumarin structure connected to phenylalanine through an amide bond.

Various forms of ochratoxins exist naturally, including ochratoxin A, ochratoxin B (dechlorinated OTA), and ochratoxin C (ethylated OTA), and are often found together. Ochratoxin A (OTA) is the most prevalent toxin.

Research indicates that this compound can exert various toxic effects such as nephrotoxicity, hepatotoxicity, neurotoxicity, teratogenicity, and immunotoxicity.

Ochratoxin A (OTA) is the most abundant and frequently detected member, also being the most toxic among the three. It is commonly present as a contaminant in a wide range of cereals, vegetables, dried fruits, spices, coffee, fermented beverages, and medicinal plants.

OTA is a weak organic acid with a pKa value of 7.1 and a molar mass of 403.8 g.mol-1. Exhibiting a crystalline structure that can range from colorless to white, this molecule displays intense green fluorescence under UV light in acidic conditions and blue fluorescence in alkaline environments.

Ochratoxin A is a relatively stable molecule and can endure most food processing to some extent, potentially appearing in consumer products.

In the context of wines, OTA is the most extensively researched mycotoxin, and the European Commission (via regulation 1881/2006) has set a maximum tolerable level for OTA in wines intended for human consumption at 2 µg kg−1.

Contamination can occur from the early stages of mycotoxigenic fungi colonization in grapes to the final stages of the wine packaging process.
Ochratoxin A Overview

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Foodborne Toxico-Infection

A foodborne sickness arises when the microorganisms contained in the food are ingested, leading the food to act as a vehicle for transmitting harmful organisms and toxic substances.

Foodborne toxico-infection is a fusion of food poisoning and bacterial infection. The microorganism undergoes significant growth within the food and then continues to multiply within the gastrointestinal tract once the food is consumed. As a result, toxins are released, causing symptoms. In contrast to food poisoning, where the toxin originates in the food and is then ingested, in toxico-infection, the bacteria are non-invasive and cause illness by generating toxins while they grow within the human intestines. The onset of symptoms in toxico-infection is generally, although not always, longer than what is observed in food poisoning, but shorter than the onset seen in bacterial infections.

For example, Bacillus cereus triggers a toxico-infection characterized by diarrheal toxins. This is due to the production of heat-sensitive toxins either within the intestines or the food itself. Bacillus cereus is a gram-positive microorganism that is facultative anaerobic and produces heat-resistant spores, enabling it to thrive within a temperature range of 10-50 °C.

Similarly, Vibrio cholerae O1 and O139 can also lead to toxico-infection. These bacteria do not invade tissues and cause diarrhea through the production of cholera toxin within the intestinal tract.
Foodborne Toxico-Infection

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Food poisoning

Food poisoning also called food-borne illness, can be defined as sudden illness that occurs after the ingestion for contaminated food or the drink.

There is no definite time limit when symptoms of food poisoning are felt by the patient after consuming a toxic or contaminated food. The symptoms, varying in degree and combination, include abdominal pain, vomiting diarrhea, and headache; more serious cases can result in life threatening neurologic hepatic and renal syndromes leading to permanent disability or death.

Symptoms of potentially life-threatening food poisoning include: diarrhea persisting for more than three days; a fever higher than 101.5°F; difficulty seeing or speaking; symptoms of severe dehydration, which may include dry mouth, passing little to no urine, and difficulty keeping fluids down; bloody urine.

Infectious organisms—including various bacteria, viruses and parasites—or their toxins are the most common causes of food poisoning. An outbreak if it happened that symptoms of the disease appeared in more than two people, and laboratory studies have shown that the ingested food is the direct cause by planting the bacteria that cause poisoning, and food poisoning caused by bacteria is the main cause in more than 80% of food poisoning cases.

The most common form of food poisoning is salmonellosis, a type of food poisoning caused by salmonella bacteria. Other common types of food poisoning include botulism, shigellosis, mushroom poisoning, cryptosporidiosis food poisoning campylocater food poisoning ,Escherichia coli food poisoning, and staphylococcus food poisoning.

When caused by a bacteria species, they secrete poisonous substances known as toxins. These toxins are harmful to the body’s systems. The toxins are extremely potent and are rapidly adsorbed by the GIT which can become bounded to tissues causing negative effects. Some also secret enterotoxins which makes them resist to heat therefore difficult to control.

Contamination of food can happen at any point during its production: growing, harvesting, processing, storing, shipping or preparing. Cross-contamination—the transfer of harmful organisms from one surface to another—is often the cause. This is especially troublesome for raw, ready-to-eat foods, such as salads or other produce.

Food poisoning can usually be prevented by keeping hands clean and preparing food in proper, hygienic and clean ways.
Food poisoning

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