News

Mushroom has a high nutritional value, rich in protein, amino acids, vitamins and a variety of trace elements. With the continuous innovation of mushroom cultivation technology, some mushrooms are not safe, if the mushroom contains a large number of chromium, cadmium, mercury, lead arsenic 5 elements, it will have a toxic effect on the human body, a large amount of chromium is absorbed by the human body, which will cause chronic poisoning to the human body.

In order to ensure the safety of shiitake mushrooms, strict heavy metal testing must be carried out. The test can identify the content of harmful elements in shiitake mushrooms, especially chromium, cadmium, mercury, lead, arsenic and other five elements.

In the process of heavy metal detection in lentinus, microwave digestion technology, as an effective means of sample preparation, can completely decompose the mushroom samples in a short time, which is convenient for subsequent analysis.

The following is a sharing of the experimental procedure for the digestion of mushrooms by microwave digestion:

Reagent:

Nitric acid (65% excellent purity grade): Nitric acid is the most commonly used digestion reagent, which has strong oxidizing properties, can effectively decompose the organic matter in mushrooms, and release heavy metals and other elements.

Hydrogen peroxide: As an auxiliary reagent, hydrogen peroxide can improve the digestion efficiency and help to completely decompose organic residues, especially the complex organic matrix in mushrooms.

Ultrapure water for experiments: used to dilute the digested solution and adjust the acidity to ensure that the sample concentration is appropriate during subsequent detection.

Sample:

The dried sample is crushed into powder by a grinder and sieved for later use

Instrument:

Welso WMD600 microwave digestion system

Procedure:

Accurately weigh the crushed mushrooms, about 0.2-0.5g with the digestion vessel.

Add 4mL of nitric acid and 1mL of hydrogen peroxide, close the lid and tighten it and put it into the microwave digestion system.

Set up the microwave digestion program as shown in the table:

Set microwave digestion program as shown in the table:

After the digestion is completed, cool down to room temperature, take out digestion vessel to evaporate acid and wait for further analysis.

Digestion Conclusion:

After digestion, the sample is transparent and clear

The application of microwave digestion technology in the digestion of mushrooms not only significantly improves the efficiency and accuracy of digestion, but also ensures the safety and environmental protection in the sample preparation process. This technology provides strong support for the subsequent analysis of heavy metals and trace elements in mushrooms, and ensures accuracy of food safety testing and nutritional analysis.