Thử thịt bị tẩy (và khác thức ăn khác)

Các loại thuốc dùng bất hợp pháp để tẩy thịt đều thuộc dạng Sulfite:
Na2SO3: Sodium Sulfite
K2SO3: Potassium Sulfite
Na2HSO3: Sodium HydroSulfite
KHSO3: Potassium HydroSulfite

Để phòng ngừa mua lầm các loại thực phẩm đã được tân tạo với hóa chất Sulfite, thì thể sử dụng Sulfite Test.

Hiền nay có nhiều công ty bào chế Sulfite Test
1) Mercoquant 110013 của hảng Merck Millipore
Merck Sulphite Test Strips "Mercoquant 110013". They cost $70.00 plus GST plus $35 freight = $112.00 for 100 tests.

http://www.chemdat.merck.de/is-bin/i...25_mqarsen.jpg
The sulfite test is suitable for food analysis, particularly in the testing of wine and fruit juices, sulfurated foods (e.g. fresh and dried fruits), fish shellfish, crustaceans and minced meat products.

http://www.chemdat.merck.de/sweden/c...search+results

Nên đọc thêm:
http://www.fedupwithfoodadditives.in.../sulphites.htm
Trích:
DETAILS OF HOW TO USE THE TEST STRIPS
You have sulphite test-strips. Their active end, which you put into the meat and don't touch with your fingers, has a small white square on it. There is a colour scale on the outside of the in the plastic bag.
In addition, you will need the following, all rinsed and dried thoroughly between uses: Measuring teaspoon, Small glass tumbler, Small fork, Chilled water, Knife.
Buying the meat samples
Best to buy the samples fresh, keep cool and test as soon as you get home. Friday afternoon is a good time because those butchers who use sulphites illegally often wait until the inspectors are unlikely to call. Ask for 250g. Make sure that you label the bag with the date and name of the butcher so there can be no mix-ups.
Testing the meat sample.
1. Put two teaspoons of chilled water into the tumbler.
2. Slash open the plastic bag containing meat. Make a diagonal cut in it with a clean knife to expose the centre of the meat. Scoop out a teaspoon full from one end of the cut surface, level with the knife if needed, and drop into the tumbler. Repeat, taking the sample from the other end of the cut surface.
3. Thoroughly macerate the mince and chilled water with the fork so that it is a uniform sludge. This takes about 15 seconds to do properly.
4. Without touching the active end of the Sulphite test strip, dip the active end into the mince sludge for one second. Make sure that it is thoroughly wetted by wriggling it around.
5. Take out of the sludge, flick clean and time exactly 30 seconds. You can rinse briefly with cool water to get any meat off the active end.
6. Compare the colour of the active end with the colour scale supplied. Put the active end and the colour scale side by side and try the next higher and the next lower to be certain.
7. Write down the reading. Note that meat contains some sulphites anyway from the high level of protein, so some pink colour is expected.
8. Don't panic if you get 80ppm. The calculation is to take 80 from the reading and then multiply by 2. Therefore a reading of 80 is 0 ppm. A reading of 180ppm is 200ppm after correction. ppm means parts per million.
Rapid strip test
Sulphite test strips (Merckoquant strips, Merck Pty Ltd) are available
commercially. Briefly, 10g of minced meat is mixed in 20 mL of water,
filtered and the resulting filtrate is adjusted to pH 12 with 1 M NaOH. A
strip is dipped into the filtrate and examined against a colour scale to
give an approximate value. They can be used, and have been used, by
concerned individuals; however, the manufacturer acknowledges that
this method can have interference from the cysteine or glutathione in
the meat which will give a false positive.

2) Sulfite test paper from CTL Scientific Supply Corp.
http://www.ctlscientificsupply.com/p...g/90763pic.gif
Pack Size: box of 100 strips
Hazard Class /UN Number: Not Restricted
Storage Temp: Room Temperature

This test paper is recommended for the rapid detection of sulphites and gaseous sulphur dioxide. The white paper turns pink to brick-red in the presence of sulphite or free sulphur dioxide. The paper does not react with sulphites in acidic solutions. These have to be neutralized with solid sodium acetate. Thio-sulphates only interfere with the determination of gaseous sulphur dioxide.Limit of sensitivity: 10 mg/l Na 2 SO 3Note: sulphite test paper can also be used for medical-diagnostic purposes as a rapid test for sulphite oxidase deficiency.

http://www.ctlscientific.com/cgi/dis...item_num=90763

3) Sulfitecheck của hảng Appealing Products Inc.
www.sulfitecheck.com
Rapid, Low Cost & Easy-to-Use
Detectors for Sulfites
in Food, Wine, Beer and Other Drinks
________________________________________
Easily Detect Sulfites in Wine, Beer, Dried Fruits, Meats and other Food and Drinks!
The SulfiteCheck™ Detector is a small and easily concealed detector which allows the user to rapidly detect if sulfites are present in food and drinks. This detector comes equipped with a builit in Qualtiy Assurance that lets the user know if the detector is working properly.
Sensitivity: As low as 5 parts per million.
Detection Time: The SulfiteCheck™ detects the presence of Sulfites in under THREE mintues!
http://sulfitecheck.com/image/data/S...20Sulfites.jpg
Testing Solid Foods: First mince the food and place it in a seperate container. To the container, add an equal volume of water and mix well.

Testing Liquids such as Wine or Beer: Use the liquid as it is.

How to Test:

Simply pour a small amount of liquid on BOTH sides of the SulfiteCheck™ Detector and wait three minutes.
A blue color will form on the "Quality Assurance" side of the SulfiteCheck™ Detector to indicate that the detectors are working properly.
A white color will form on the "Sample" side of the SulfiteCheck™ Detector if the sample contains sulfites.

Concerned about exposure to Sulfites?
Worried Sulfites may be causing your Asthma/Allergy to Worsen?

The SulfiteCheck™ Detector for Sulfites rapidly and easily detects Sulfites in Foods and Drinks. (PATENT PENDING).

A simple color change alerts the user if Sulfite is present. The detectors can be used to test wine, beer and different foods for the presence of Sulfites. Testing for Sulfites can be completed in less than THREE MINUTES. Full instructions are provided to ensure that all tests are performed properly. A reference color chart is provided for interpreting the test results.

The SulfiteCheck™ is a very sensitive detector for Sulfites which are added to foods and drinks to preserve them.

INSTRUCTIONS - The four easy steps for detecting Sulfites instantly are:
http://sulfitecheck.com/image/data/S...ions_Small.png
Step by step instructions:
1. Prepare the sample as per the instructions.
2. Remove the needed number of detectors from the pouch and reseal the pouch.
3. Place a small amount of liquid from the prepared sample onto the detector so it covers both holes.
4. Observe the detector after three minutes and compare the results to the provided Results Interpretation Chart.

Foods Tested with SulfiteCheck™
Below are examples of foods that have been tested with SulfiteCheck™. Many foods are being tested everyday and this page will be updated accordingly.

http://sulfitecheck.com/image/data/Wine_Comparison.png

Sample: Dried Apricot
http://sulfitecheck.com/image/data/D...Comparison.png

Sample: Dried Mango
http://sulfitecheck.com/image/data/Mango_Comparison.png

Ngoài loại này ra, hãng Appealing Products Inc. còn bào chế các loại thuốc thử khác, như thuốc ướp xác (Formaldehyde):
http://formaldehydetests.com/
Rapid, Low Cost & Easy-to-Use
Detectors for Formaldehyde
in Food and Drink
http://formaldehydetests.com/image/d...ps%202%20S.jpg
Formaldehyde is a toxic material that can kill bacteria and viruses as well as damage human cells. Food manufacturers sometimes add formaldehyde to foods such as milk, noodles meats etc to extend their shelve life. Many ordinary foods contain naturally traces of formaldehyde, however, excess formaldehyde was reported to increase cancer and cause breathing difficulties.

Although adding formaldehyde to foods is forbidden in many countries, some manufacturers still add it in particular if the food is expected to stay unrefrigerated for a while. Consumers of foods need to know if they contain excessive and dangerous amounts of formaldehyde. Inspectors of food need to know if formaldehyde was added purposely and illegally to the food.

Our formaldehyde detectors allow for rapid, easy detection of formaldehyde in food and drink (PATENT PENDING).


More Information on Sulfites
What Sulfites Are:

Sulfites are the general name for six specific substances:

Sulfur Dioxide
Sodium Sulfite
Sodium Bisulfite
Sodium Metabisulfite
Potassium Bisulfite
Potassium Metabisulfite

Sulfites are common additives in many foods and drinks. Sulfites are added to foods to prevent spoilage and as a preservative, and are also added to wines, beers, fruits, vegetables, medications, and seafood to stop them from discoloring. Unfortunately, 5-10% of people are susceptible to allergic reactions due to sulfite containing foods and drinks. Also, 10-15% of people with asthma are also susceptible to allergic reactions due to sulfite containing foods and drinks.

Symptoms of Sulfites:

Hives
Nausea
Gastritis
Puffiness in Face/Eyes
Water Retention/Bloating
Coughing
Shortness of Breath
Sneezing
Runny Nose
Vomiting
Abdominal Pain
Constipation
Flushing of Skin/Face
Anaplylactic Shock

Foods and Beverage Sulfutes are Added To:

Apple Cider and Other Ciders
Beer
Wine
Avocado Dip
Condiments including Jams, Gravies, and Molasses
Sauerkraut
Bottled Lemon and Lime Juices
Corn Starch
Dried Fruits
Dried Vegetables
Dried Potatoes
Maraschino Cherries
Fruit and Vegetable Juices
Peeled Potatoes including French Fries and Chips
Pickled Meats and Vegetables
Restaurant Food and Prepared Frozen Dinners
Shrimp and Shellfish
Hominy
Various Cheeses
Canned/Jarred Clams
Dry Soup Mix
Gelatin
Crackers
High Fructose Corn Syrup
Cookies

Foods and Beverages Sulfites Occur Naturally:

Asparagus
Chives
Eggs
Fish including Salmon and Dried Cod
Garlic
Leeks
Lettuce
Maple Syrup
Onions
Soy
Tomatoes

Hy vọng chút thông tin mọn trên giúp ích cho các bạn. Hihihihihihi

Khi nào lão biết có đậu hủ giả thì thông báo dùm... Hihihi

Lão Tư Hẹp,
Lão thích ăn tàu hủ giả lắm à???
Lão muốn thì có liền nè:

Trích:
http://swiss-authentication.blogspot...-59000-of.html
Fake Tofu being made in China: $59000 of materials seized

http://4.bp.blogspot.com/_f5wX-rjlxh...20/tofu-st.jpg

{WUHAN - INDUSTRIAL and commercial authorities in Wuhan, capital of Central China's Hubei province, have shut down an underground workshop producing tofu products under a fake brand name.


The tofu appeared in the markets of Central China's Hubei and Hunan provinces in recent months.

Hao Jinqi, an official with the industrial and commerce bureau of Dongxihu district, Wuhan, told China Daily that they raided the illegal workshop in the city's Zhanggongdi area after receiving a report and inspecting the premises. 'There was production equipment worth more than 300,000 yuan ($58,750) and raw materials,' Mr Hao said.


The packaging used on the tofu resembled that used by Dean Fa Food to such an extent that it even bore anti-counterfeit laser film labels. 'The laser label printing machine is worth about 8 million yuan and the printing house must be a pretty large one,' said Yang Shuaifeng, of Dean Fa Food.}

Nothing is sacred when Tofu gets counterfeited. Notice they went to great lengths to reproduce the laser labels that Dean Fa Food made, and spent at least $1.2mil on defeating anti-counterfeit measures. (Tony Zafiropoulos)

Thêm nửa nè:
Trích:
http://ww.packwebasia.com/index.php/...cing-fake-tofu
Factory in China caught producing fake tofu
http://ww.packwebasia.com/images/sto.../realtofub.jpg
CHINA – Two factories in Wuhan, Hubei province, China, have been shut down by local authorities for producing fake tofu products using chemical ingredients including isolated soy protein and pigment.

The two unlicensed plants packaged the fake tofu under the trademark of a legitimate food company located in Jiangsu province, Jiangsu Dianfa Food Ltd, then sold them at markets in Hunan and Hubei provinces.tofufake

Local media quoted a worker at one of the factories, who said they mixed soy protein, flour, salt and monosodium glutamate together, added ice and pigment, then poured the solution into boxes to be steamed, before packaging.

Care was taken to ensure the packaging for the counterfeit products closely resembled the authentic tofu packages, to the extent of using anti-counterfeit laser film labels.

When officials from the industrial and commerce bureau of Dongxihu district, Wuhan raided one of the illegal factories in the city’s Zhanggongdi area after receiving a tip-off, they found production equipment worth more than US$58,750 (CNY300,000) and stocks of raw material.

Lão nghe qua Mìn Dưa hấu chưa? Cả khu bị nổ luôn!!! Hihihihihi
Trích:
http://articles.nydailynews.com/2011...rmers-chemical

Watermelons explode like 'land mines' in China thanks to chemical calamity
BY LUKAS I. ALPERT
DAILY NEWS STAFF WRITER
Tuesday, May 17, 2011

Chinese farmers discovered how science can go bad after fields of watermelons exploded like "land mines" after being over-pumped with growth chemicals.

The chilling chemistry calamity struck after a group of 20 farmers in Jiangsu Province used a growth accelerator for the first time during a period of heavy rains.

That caused hundreds of groaning melons to pop like balloons, state broadcaster CCTV reported.

"On May 7, I came out and counted 80 but by the afternoon it was 100," said farmer Liu Mingsuo. "Two days later I didn't bother to count anymore."

Watermelons Explode Because of Chemical
[YOUTUBE]bLW7JUGfn9I[/YOUTUBE]


Trích:
http://blogs.ft.com/beyond-brics/201...#axzz1w1Q6yaR7
China’s exploding watermelon scandal
High quality global journalism requires investment. Please share this article with others using the link below, do not cut & paste the article. See our Ts&Cs and Copyright Policy for more detail. Email ftsales.support@ft.com to buy additional rights. http://blogs.ft.com/beyond-brics/201...#ixzz1w1QYCW32

Housewives across China are fretting that their watermelons are not safe to eat after state media reported melons were being injected with a plant growth stimulant called forchlorfenuron, raising fears of yet another food safety scandal.

“I don’t know what I can eat after this watermelon explosion event,” said one user on Sina’s microblog platform, which is China’s biggest online comment forum.

Watermelons are ubiquitous in the Beijing summer, when most households keep a chilled melon in the fridge to alleviate the summer heat. But this year the innocuous fruit has given rise to its very own food safety scandal.

In the city of Danyang, near Nanjing, watermelons planted across 115 acres of land split open after a heavy rainfall, state media reported. According to Wang Liangju, a professor at Nanjing Agricultural University who inspected the damaged crops last week, the melons burst open because a plant growth stimulant, forchlorfenuron, was applied too late in the growing cycle.
http://blogs.ft.com/beyond-brics/fil...lon-farmer.jpg
The burst watermelons follow on the heels of several food safety scandals this year, from tainted pork, to “recycled” cooking oil, to rice laced with heavy metals. Even three years after the melamine scandal that poisoned thousands of children with toxic infant formula, food scandals have continued unabated and public paranoia over food remains high. In Beijing, some upper-middle class urbanites have even taken to growing their own small plots of vegetables outside the city to ensure their quality.

The exploding watermelon phenomenon has been well-known in Jiangsu province for years, but it captured national attention with a TV report that aired Monday.

“Everyone in the Nanjing area calls this variety the “exploding watermelon” because it has such thin skin that it will easier break open when you try to cut it,” Wang said, adding that this particular strain of melon had been imported from Japan.

The chemical applied to the watermelons is commonly used around the world to stimulate fruit growth. In the US it has been linked to kidney inflammation in rats, according to the US environmental protection agency.

While exploding watermelons may not be the new melamine, they point to a greater challenge for Chinese agriculture: regulating the use of fertilisers and pesticides. “Chinese farmers, whose education levels are generally low, should be told when and how to use plant hormones, fertilisers and pesticide,” said Wang.

Most Chinese farms are small, family-run plots, and farmers often assume that more fertiliser, or more forchlorfenuron in this case, is always better. Overuse of fertiliser and pesticides has in many areas stripped the soil of nutrients or made it too acidic, as well as contributing to river and lake pollution.

Trích:

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Nguyên văn bởi VinhL

Lão Tư Hẹp,
Lão thích ăn tàu hủ giả lắm à???
Lão muốn thì có liền nè:

......

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Ta thì đâu có nói câu đó đâu mà nhà ngươi lại bóc nó bỏ vào miệng ta. Ta chi hỏi:

Trích:

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Nguyên văn bởi TuHepLuong

Khi nào lão biết có đậu hủ giả thì thông báo dùm... Hihihi

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Anyway, Cám ơn lão đã chia bớ kiến ngủ của lão cho diễn đàn còn ta cần xem lại đâu hủ trước khi cho nó vô bụng hihihi