Formalin is an aqueous solution of formaldehyde, colorless and transparent in appearance, and is usually used as a preservative for preserving cadaver specimens. Pickled chicken claws really contain formalin?June 23, the reporter came to Hubei College of Arts and Sciences, School of Chemical Engineering and Food Science, Northwest Hubei Traditional Fermented Foods Research Institute, through experiments to prove the rumors true or false.

Experimental materials and equipment

Hunan Jin Aili Food Co., Ltd. production of Jin Aili brand beautiful phoenix claws, wild pepper chicken claws, Tongxu County, from the good food Co., Ltd. production from the good brand of wild pepper phoenix claws, country bumpkin chicken claws; 1 ﹪ resorcinol solution; tissue masher; Nano colorimetry tubes and so on.

Experimental process

Dr. Guo Zhuang, food science, test whether the pickled chicken claws contain formalin, simply add the pickled chicken claw solution of resorcinol solution, if the pickled chicken claw solution is orange-red, there is formaldehyde, and the formaldehyde content is higher; if the solution is light red, contains formaldehyde, but the content is lower; if the solution has no color change, then it does not contain formaldehyde.

Guo Zhuang and four assistant experimenter first bubble pepper chicken claws with scissors cut into small pieces, after the tissue masher mashed, respectively, weighed 15 grams placed in a triangular bottle, and then add 60 ml of distilled water, shaking machine vibration for 30 minutes, so that the chicken claws in the composition of the chicken claws is fully mixed with the distilled water as a preparatory solution for qualitative determination.

The assistant laboratory technician took 5 ml of the sample preparation solution in Nano colorimeter tubes, labeled as: sample No. 1, sample No. 2, sample No. 3, and sample No. 4, respectively. Next, a drop of formaldehyde solution was added to one of the preparations for comparison, labeled as sample #5.

Guo Zhuang will be configured with a solution of resorcinol added to the five samples of the preparation solution, the results of the four pepper chicken claw samples preparation solution did not appear color change, was added a drop of formaldehyde solution of the No. 5 samples turned orange-red.

The results of the experiment show that there is no formalin in the 4 samples of chicken feet.

Guo Zhuang explained that formaldehyde has an antiseptic effect, but the national regulations formaldehyde can not be added to food as a food additive. If you accidentally consume food containing formaldehyde, will cause allergies, diarrhea, serious poisoning, the amount is fatal. Not through the national food safety certification of food, may use hydrogen peroxide as a preservative, and hydrogen peroxide has a corrosive effect on the digestive tract. He suggested that the general public, try to choose the regular manufacturers of pickled chicken feet.