Tofu, a favorite food

IMPROVEMENT quality human resources one of which is determined by the quality of food consumed.

Act No. 7 of 1996 states that the quality of food consumed must meet several criteria, among which are safe, nutritious, quality, and can be affordable by the people's purchasing power.

AMAN here is free of contamination include biological, microbiological, chemical, heavy metals and other contamination that may disrupt, harm, and harm human health. One of the frequently consumed foods are known.

Tofu is a popular food in Indonesia, although the origin of China. popularity of the idea is not only limited because it feels good, but also easy to make and can be processed into various forms of food and cheap.

In addition, knowing is one of healthy foods because of high protein content and quality equivalent to the quality of animal protein. This can be seen from the value of NPU (net protein utility) to know which reflects the number of proteins that can be utilized the body, which is about 65 percent, in addition to having a high digestive power of about 85-98 percent.

Therefore, the idea can be consumed by all levels of society. Know also contain other important nutrients, such as Kemak, vitamins, and minerals in amounts high enough.

Besides advantages, know also has a weakness, namely a high water content so easily damaged by easily grown microbes. To extend the storage period, most of the industry know that there are in Indonesia, adding preservatives. The added preservatives are not limited to the permitted preservatives, but many entrepreneurs are naughty by adding formalin.

In addition, many also added methanyl yellow coloring. Formalin and yellow is metahnyl food additives (BTP) which prohibited its use in food regulation by the Minister of Health (Minister) Number 1168/Menkes/PER/X/1999.


Formalin is a trade name of formaldehyde solution in water with levels of 3040 percent. On the market, can be obtained in the formalin was diluted form, ie with formaldehidnya levels 40, 30, 20 and 10 per cent and in the form of tablets each weighing approximately 5 grams.

Formalin is toxic and harmful to human health. If the contents in the high body, will react chemically with almost all substances in the cells that suppress cell function and causes cell death that causes toxicity in the body.

In addition, a high content of formaldehyde in the body also causes stomach irritation, allergic, carcinogenic (cancer causing) and are mutagens (causing changes in cell function / network), as well as those who consume it will be vomiting, diarrhea with blood, urine mixed with blood, and deaths caused by circulatory failure. Formalin when evaporated in the air, a colorless gas with a sharp suffocating odor, thus stimulating the nose, throat, and eyes.

Food coloring is a food additive that can improve the appearance of food. The addition of food dye has several goals, among which are giving the impression of interest to consumers, uniformity and stabilize color, and color changes due to cover the processing and storage.

Mostly the colors are divided into two, namely natural and synthetic dyes. Known natural dyes include Suji leaves (green), guava leaf / leaf identity (red color), and turmeric for yellow dyes.

The weakness of this natural dye is a color that is not homogeneous and limited availability, whereas this advantage is dye safe for consumption.

Other types are synthetic dyes. Dyes of this type has advantages, namely homogeneous color and its use is very efficient because it requires only a very small amount. However, if the deficiency is contaminated during the process of heavy metals, dyes of this type would be dangerous.

In addition, specifically for the food coloring known as special food (food grade). In fact, in Indonesia, particularly small industries and home industries, the food is still very much use nonmakanan dyes (dyes for the manufacture of paint and textiles).

Dyes on the idea

Research conducted by Mena (1994) found that the idea that circulated in Jakarta traditional markets contain 70 percent of the levels of formaldehyde 4.08-85.69 ppm (parts per million).

Research Tresniani (2003) in the city of Tangerang shows there are 20 industries out of 11 industries out nine yellow and white knew produce industry. Ingredients range from formalin know
2-666 ppm, whereas the content of his yellow methanyl there are only three kinds of knowing that all obtained from the market, and it ranged between 3.41-10.25 ppm.

Other studies conducted by Melawati (2004) of five samples out Sumedang taken directly from the producers know what is located at Jalan Mayor Abdurrahman (three plants) and Road 11 April (two plants) all showed negative results or it does not contain formaldehyde. This is understandable because the producers do not need to add preservatives because they know that it manufactures finished in a single day.

Know that not only tolerate preserved stored for two days when immersed in water wells or clean tap water.

Some ways typical preservation is:

* Know boiled for 30 days and then soaked in water that has been cooked, simpannya power could be four days.
* Tofu boiled, then wrapped in plastic and stored in the refrigerator, has an eight-day endurance;
* Know preserved with sodium benzoate soaked 1000 ppm for 24 hours to maintain freshness for three days at room temperature;
* Know soaked in 0.05 percent of vitamin C for four hours to keep out for two days at room temperature;
* Know soaked in citric acid 0.05 percent for eight hours will be fresh for two days at room temperature.

Tips choose to know

Know that contain formalin can be marked with:

* The higher content of formaldehyde, the smell of the drug sting, while the idea would berformalin not smell the typical soy protein;
* Know who has the nature berformalin bouncy (if pressed felt very springy), while knowing when pressed berformalin not be destroyed;
* Know berformalin will last longer, while most berformalin not only tolerate a couple of days.
* Know who use artificial coloring can be characterized by looking in appearance. If you know the use of artificial coloring, the color is very homogeneous / uniform and shiny appearance. Meanwhile, if using turmeric dyes, the colors tend to be more opaque (not clear). If we cut him, it would look on the inside color is not homogeneous / uniform. In fact, there is still a white majority .*

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