Green Food Cabbage Vegetables Testing

The detection methods of green food cabbage vegetables mainly include the following aspects:

1. Heavy metal content detection

Heavy metal detection is one of the important items for green food cabbage vegetable detection, mainly covering lead, cadmium, mercury, and other components to ensure that vegetables meet health standards. Common detection methods include:

Atomic absorption spectrometry: quantitative element analysis is performed by using the absorption of the characteristic spectral lines of the ground state atomic vapor of the element being tested. This method has the advantages of high sensitivity, good selectivity, and simple operation.

Inductively coupled plasma mass spectrometry: Using an inductively coupled plasma torch as the excitation light source, the spectrum emitted by the excited plasma is used for quantitative element analysis. This method can detect multiple elements at the same time, with low detection limits and high accuracy.

2. Pesticide residue detection

Pesticide residue detection is the key to ensuring that cabbage vegetables are not used in excessive or illegal pesticides during cultivation. Common detection methods include:

Gas chromatography: Separation is performed by using the different adsorption or solubility of different substances in the gas phase and the difference in their distribution coefficients between the stationary phase and the mobile phase. This method is suitable for detecting organophosphorus, organochlorine, and other pesticide residues.

Liquid chromatography: Separation is carried out by using the different distribution capabilities of each component in the mixture between two phases. This method is suitable for detecting pesticide residues such as carbamates, carbendazim, and avermectin. In addition, liquid chromatography-mass spectrometry (LC-MSMS) can also be used for the detection of pesticide residues, with higher sensitivity and selectivity.

III. Microbial index detection

Microbial index detection is an important link in ensuring the sanitation and safety of green food cabbage vegetables. Common detection methods include:

Culture identification method: The sample is inoculated on a specific culture medium and the growth of microorganisms is observed by cultivation for identification. This method can intuitively reflect the microbial contamination of the sample.

PCR technology: Detection is carried out by amplifying specific gene fragments of microorganisms. This method has the advantages of rapidity, accuracy, and high sensitivity, and is suitable for detecting harmful microorganisms such as Escherichia coli and Salmonella.

IV. Nutritional component detection

Nutrient component detection is the key to ensuring the nutritional value of green food cabbage vegetables. Common detection methods include:

High performance liquid chromatography: used to analyze nutrients such as vitamins and minerals. This method has the advantages of high separation efficiency, fast analysis speed, high sensitivity, and automated operation.

Other methods: such as drying method for moisture determination, Kjeldahl nitrogen determination method for protein content determination, Soxhlet extraction method for fat determination, etc. These methods can comprehensively and accurately reflect the nutritional content of cabbage vegetables.

V. Sample collection and preparation

Before conducting the above tests, sample collection and preparation are also required. Cabbage vegetable samples should be randomly selected from suppliers and transported to the laboratory at low temperature. Samples need to be cut, crushed and stored for standby during preparation. These steps are essential to ensure the accuracy and reliability of the test results.

In summary, the detection methods of green food cabbage vegetables cover multiple aspects such as heavy metal content, pesticide residues, microbial indicators and nutritional components. These detection methods together constitute a complete system for quality control of green food cabbage vegetables, providing strong protection for consumer health and market regulations.