Shepherd's purse detection

The detection methods of the shepherd's purse mainly vary according to its application scenarios and detection purposes. The following are some common shepherd's purse detection methods:

1. Appearance and feature identification
Leaf characteristics: Shepherd's purse leaves are pinnately compound leaves, with oblong leaflets and serrated edges. There are stipules at the base of the petiole, and the stipules are semi-arrow-shaped.
Flower characteristics: Shepherd's purse flowers are white flowers with four petals, and the petals are obovate. The calyx also has four petals, which grow into the long siliques unique to shepherd's purse after flowering, and crack when mature.
Root characteristics: Shepherd's purse has a well-developed root system, with a long and straight taproot and fewer lateral roots. The roots have a unique spicy taste.
Seed characteristics: The mature seeds of shepherd's purse are oval, and brown, with a layer of membranous winged fruit on each side, and the winged fruit has a reticular vein.
Growth environment: Shepherd's purse grows mostly in hills or mountains with medium altitudes, and is commonly seen on roadsides, fields, or mountains.
By observing these characteristics of a shepherd's purse, it can be preliminarily determined whether it is a shepherd's purse.

2. Chemical component detection
Pesticide residue detection: Use chemical method or biosensor method to detect pesticide residue in shepherd's purse to ensure that pesticide residue does not exceed national standards.
Heavy metal detection: Detect the content of heavy metals (such as lead, cadmium, arsenic, etc.) in shepherd's purse by atomic absorption spectroscopy, inductively coupled plasma mass spectrometry, etc. to ensure that the heavy metal content is within a safe range.
3. Nutritional component detection
Water, protein, cellulose content detection: Use drying method, Kjeldahl nitrogen determination method, acid-base digestion method and other methods to detect the water, protein and cellulose content in shepherd's purse to evaluate its nutritional value.
Vitamin content detection: Use high-performance liquid chromatography and other methods to detect the content of nutrients such as vitamin C, vitamin A, and carotene in Shepherd's purse.
4. Microbial detection
For processed products such as dried shepherd's purse, microbial detection is required to ensure its hygienic quality. The detection items include coliform group, total colony count, Staphylococcus aureus, mold and yeast, etc. Detection is carried out by plate counting method, microscope observation method and other methods.

V. Sensory quality detection
Evaluate the quality of the shepherd's purse by visual, olfactory, taste, and other sensory means. Observe whether its color and shape are fresh, smell whether it has a fresh smell, taste whether it is slightly bitter, etc.

VI. Precautions
Before any test, it is necessary to ensure the stability and consistency of the test environment to avoid the influence of external factors on the test results.
During the test, it is necessary to strictly abide by the operating procedures and safety regulations to ensure the safety of the test personnel and the integrity of the equipment.
The test results need to be accurately recorded and analyzed in order to objectively evaluate and improve the quality of shepherd's purse.
In summary, the detection method of Shepherd's purse involves multiple aspects of performance testing and safety evaluation. In practical applications, appropriate detection methods should be selected according to specific needs and scenarios to ensure the quality and safety of the shepherd's purse.