recently have some friends to ask, I heard that using foam to fight off soy milk unsafe, soak beans during produce carcinogenic aflatoxins, are true? Cutting from a young age we can not make the milk soak beans, soak beans have made tofu ah!
heard of such an argument, I find it very surprising. Aflatoxin is a very horrible carcinogen, it tens of times on the toxicity of potassium cyanide, even if only a trace intake, after a long-term commitment may also lead to the occurrence of liver cancer and other malignant tumors. If the foam beans will produce aflatoxin, then the trouble may be bigger, because our day-to-day by eating a variety of tofu products, are no longer necessary to soak beans beating, points into the卤制. This to, is it should not drink milk, tofu does not eat it?
However, the first not to panic too much. A rational person, to hear some sensational at all before, or at least have to judge about the validity of this argument in the end.
first want to figure out some questions; Aspergillus flavus growing conditions are what? It is easy to breed in which the food inside? Under what circumstances will produce aflatoxin?
aflatoxin is an easy-type food in the seed breeding mold. The temperature at 25-30 ℃, the 80% -100% relative humidity, 17% -18% of seed moisture content, grain, nuts, oilseeds and other products most likely breeding ground for aflatoxin. Fortunately, a variety of beans, including soybeans, not the reproduction of Materials aflatoxin likes, it likes peanuts, corn and rice and other food.
from here we can see that aflatoxin is a grain, pulses, oilseeds and other seed products when breeding damp, In general, seed is still in the water very little status, rather than fully-absorbent status. People have an experience: a big水汪汪watery bean soup, never长霉, but soon变味broken - because many a time when the water multiplication of bacteria very quickly, the fundamental propagation轮不到mold. Streptomyces cultivate their love of the matrix, most of them are a number of relatively "dry" point, but do not enough food, such as steamed bread, ah, ah bread, cakes, ah, like the seeds damp. Therefore, bread long after the president released a white, green, black霉斑, but not sour smell changed, precisely because of its status in line with the appetite of Streptomyces.
Why? Since mold is a very likes of oxygen, has a strong "terrestrial" feature. If you put food in the water, oxygen shortage, which it is difficult to breeding them. Know the basic knowledge of microbiology, will understand that mold is almost at flood conditions should not toxin-producing, so bubbles can not grow beans to aflatoxin.
so that the time to buy soybeans, dry soybeans, attention should be paid to the degree of storage in damp also need to avoid it. If you worry about the number of beans in storage aflatoxin contamination, then the first泡一泡water, then soak beans put the water away, but in fact more secure.
In fact, the vast majority of processed soybean products, they need to go through procedures for foam beans. No matter豆粥are cooked, make tofu, natto to do, or to do such as miso. Brought about by the so-called bubble beans cancer risk, contrary to scientific knowledge is entirely false argument, no need for this panic, but this should not be afraid to drink milk, and did not dare eat tofu.
important to note that the bubble in the summer of beans, if more than 4 hours, preferably on the refrigerator of them. Since the bubble high moisture beans, it is easy to breeding a variety of bacteria. Bacteria does not produce aflatoxin, may give the beans have a bad taste. If, unfortunately, the pollution of certain pathogens, they over-breeding, or have bacterial toxins, are likely to cause gastrointestinal disease. Even though playing at milk, tofu when required to do after heating sterilization, but also不可不防ah!
References:
1 Nutrition and Food Hygiene (Fourth edition), People's Health Publishing House, 2001.
2 Food Microbiology, Chemical Industry Press, 2007
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