Harm of self-pressed rapeseed oil

Friends who have land at home in rural areas especially like to squeeze some cooking oil, such as peanut oil or rapeseed oil. Today, we have to suggest that this self-pressed rapeseed oil is harmful. So, what are the hazards of self-squeezed rapeseed oil in rural areas? First of all, there may be the phenomenon that Aspergillus flavus exceeds the standard, and there may also be the phenomenon that glucosinolate and erucic acid exceed the standard. Therefore, in these aspects, self-squeezed rapeseed oil is not safe, so it is recommended to buy it from safe channels to ensure food safety.

Aflatoxin exceeded the standard.

What is really terrible is not Aspergillus flavus, which is also relatively easy to eliminate. What really worries people is aflatoxin, which is the metabolic region of Aspergillus flavus. Under the conditions suitable for the survival of Aspergillus flavus, a large number of metabolites are stimulated, resulting in aflatoxin exceeding the standard in grain and oil crops. 1993 It is classified as a 1 carcinogen by the Cancer Institute of the World Health Organization, which has destructive effects on human and animal liver tissues and even leads to liver cancer and even death in severe cases.

Rape is also an oil crop that is easily polluted by Aspergillus flavus. For example, rapeseed just harvested, not completely dried, will be moldy, contaminated by Aspergillus flavus. Aspergillus flavus is the most susceptible to infection in a nutrient-rich and humid environment, so it is also the most susceptible stage when it is just harvested. In addition, improper storage in summer is also a high-risk stage to induce aflatoxin pollution.

For small workshops, the lack of technical means to detect aflatoxin makes it difficult to eliminate aflatoxin in the process of oil extraction and refining, and it is not so easy to distinguish individual moldy particles infected with aflatoxin in rapeseed, which leads to the risk of aflatoxin exceeding the standard. This is one of the reasons why people think rapeseed oil is not so safe.

Harm of glucosinolate erucic acid

Many people like to eat rapeseed oil. The key is to like the "vegetable oil flavor" in rapeseed oil. It is said that eating hot pot in Chongqing, Sichuan likes to use rapeseed oil. Otherwise, you won't feel the fragrance. What is the taste of this unique vegetable oil? In fact, this is a substance produced by the degradation of glucosinolates at high temperature. However, glucosinolates and erucic acid contained in rapeseed are potentially harmful to human body. For example, glucosinolates will be decomposed into toxic substances such as thiocyanate and isothiocyanate under the action of enzymes, which will affect the growth of animals. However, erucic acid is difficult to be digested and absorbed by human body, so it accumulates in human body, causing vascular wall thickening and myocardial fat deposition, leading to cardiovascular diseases such as palpitation and dyspnea. This is why people think that rapeseed oil is generally unhealthy.

However, this concept should also keep pace with the times. At present, China's rapeseed varieties have been completely upgraded through the breeding of new varieties, and have been completely replaced by "double low" rapeseed varieties with low glucosinolate and low erucic acid. At present, China requires that the erucic acid content of low erucic acid rapeseed oil should not be higher than 3%, while the current rapeseed varieties can be below 1%, basically regardless of their health risks.

Generally speaking, the safety of rapeseed oil in China has been fully guaranteed through oil pressing technology and breeding. The change of vegetable oil taste is actually the result of the upgrading of rapeseed oil. Nowadays, vegetable oil is safer than in the past, so people don't have to worry so much about the edible safety of rapeseed oil. Make sure to choose edible oil from regular manufacturers.