Method for detecting rongalite in food

Abstract

The invention disclosed a method for detecting rongalite in food. The method is characterized by comprising the following steps of 1, solution preparation: preparing a solution A, a solution B, a solution C and a solution D; 2, sample treatment: weighing 1-5 g of a cutout sample in a triangular flask, adding distilled water to 20-80 mL, ultrasonic extracting for 1 - 6 min, and filtering, with the filtrate for use; 3, operation method: taking two 5-30 mL colorimetric tubes (numbered as tube A and tube B with a marker), adding 0.5-5 mL of a sample liquid to each tube, dropping 1-6 drops of the D solution in the A tube, waiting for 0.5-2 min, adding 2-10 drops of the solution A and 2-10 drops of the solution B into the two tubes respectively, shaking uniformly, standing for 5-20 min, shaking for 3-10 times during the standing process, adding 0.05-0.2 mL of the solution C, shaking for 10-40 seconds, standing for 1-10 min, adding the distilled water to a scale mark of 2-8 mL. The method for detecting the rongalite has very high efficiency and wide market prospects.

Description

technical field [0001] The invention discloses a method for detecting white lumps in food, and belongs to the technical field of food safety detection. Background technique [0002] Hanging white block, the chemical name is sodium formaldehyde sulfoxylate, also known as "diaobai block", which is made of formaldehyde combined with sodium bisulfite and then reduced. It is a chemical commonly used in dyeing technology. Hangbaikuai aqueous solution begins to decompose harmful substances above 60°C, which can cause headaches, fatigue, poor appetite, and in severe cases, nasopharyngeal cancer and damage to the kidneys. The purpose of adding hanging white cubes is not mainly for preservation but to improve the appearance quality of these foods. It can make flour, rice noodles, bamboo shoots, vermicelli, tofu, etc. look particularly white, and has the effect of bleaching and improving yield. [0003] At present, there is a lack of rapid and automatic detection methods and equipmen...

AI Technical Summary

Problems solved by technology

[0003] At present, there is a lack of rapid and automatic detection methods and equipment for hanging white blocks at home and abroad