A method for the detection of alum additives in fried food based on dielectric properties

Abstract

The invention discloses a rapid detection method for alum additives in fried foods based on dielectric properties, which comprises the following steps: crush the fried foods to be detected and place them in deionized water, reflux and stir for 1-4 hours, and filter to obtain Filtrate; use the coaxial probe method to measure the dielectric property value of the filtrate, draw 3×10 8 ~10 10 The medium dispersion curve ε′(ω) and the medium absorption curve ε″(ω) of the filtrate under the condition of Hz frequency; determine whether the food contains aluminum ions; draw the sum difference curve of the filtrate loss, according to the correlation between the dielectric properties and the alum additive Equation N=0.1514Δε″ 0.425GHz Calculate the content of alum additive; Wherein, N is the content of alum additive, Δε " 0.425GHz is the differential medium absorption intensity of the filtrate at the frequency of 0.425GHz. The detection time of the invention is short, the method is simple and easy to operate, and has wide application prospects in the detection of the content of the alum additive in the fried food.

Description

technical field [0001] The invention relates to a method for rapidly detecting alum additives in food, in particular to a method for rapidly detecting alum additives in fried foods based on dielectric properties. Background technique [0002] Fried dough sticks are one of the traditional Chinese breakfasts. They are crispy on the outside and loose on the inside, golden in color. It is a unique food that is suitable for all ages and women and children. Alum needs to be added in the process of fried dough sticks. When people eat alum, most of the aluminum contained in it is excreted through the kidneys and other organs, and only 1% to 2% is absorbed and stored in the human lungs, bones, liver, brain, Testicles etc. When the intake of aluminum is too much, it will often increase the burden on the kidneys, which will cause renal dysfunction, renal failure and uremia. [0003] At present, aluminum detection methods include traditional titration, spectrophotometry, etc., and gra...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of the existing detection methods that are simple but not high in precision, precise but time-consuming and laborious, and complicated in process, the present invention provides a method for rapidly detecting alum additives in fried foods based on dielectric properties, which is fast, simple, precise With high precision, it can accurately and conveniently detect the aluminum content in fried food, so as to judge whether the food meets the hygienic standard

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