Standard sample of Sudan red in egg and preparation method of standard sample

Abstract

The invention discloses a standard sample of Sudan red in eggs and a preparation method of the standard sample. According to the preparation method, a mixed stock mother liquor containing the Sudan red I, the Sudan red II, the Sudan red III and the Sudan red IV is prepared firstly, then most of the egg liquid is added for dilution, the matrix matching property can be kept in the mode, and meanwhile the problem that the Sudan red is not dissolved in water and is not prone to being evenly dispersed in the egg liquid matrix is solved; and then drying is performed in a low-temperature spray drying and airflow crushing manner, so that the material is fluffy and is not easy to harden and block in the storage process, and the sample stability is better. According to the standard sample provided by the invention, commercially available eggs are directly adopted as raw materials, the raw materials are easy to obtain, other substances capable of changing matrix components are not introduced in the preparation process, the base material matching property of the standard sample and an actual tested sample is guaranteed to the maximum extent, and the standard sample is good in uniformity and stability, and can be used for measurement and calibration of food detection related instruments, instrument period check and method verification, measurement personnel examination and the like.

Description

technical field [0001] The invention belongs to the technical field of standard samples, and in particular relates to a Sudan red standard sample in eggs and a preparation method thereof. Background technique [0002] Eggs are very rich in nutrients and have become an indispensable and important food in people's daily life. Sudan red is an artificially synthesized industrial dye. In 1995, the European Union (EU) and other countries have banned it from being used as a pigment in food. Adding it is also expressly prohibited in our country. However, due to its bright dyeing, some countries such as India allow the addition of Sudan Red I in the process of processing chili powder. The EU detected Sudan Red in the red pepper powder imported from India, and the amount of Sudan Red I detected was 2.8-3500mg / kg. At the same time, this substance is also detected in other foods, such as the content of Sudan I in some seasonings reaches 0.7-170mg / kg. There are also some reports that ...

AI Technical Summary

Problems solved by technology

[0004] The existing method for preparing standard samples in eggs is as follows: simulating the feeding conditions in the natural environment, feeding the target compound, collecting egg liquid, and making the egg liquid into freeze-dried powder by freeze-drying; pulverizing the freeze-dried powder, separating The standard sample is prepared by the process of packaging and irradiation sterilization. This process has a long preparation cycle and is difficult to design the sample content. In addition, there are many uncontrollable factors such as poultry death and metabolism of target compounds during the feeding process.

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