glabridin

Chinese nameglabridin
Specification: 20mg/piece
Detection method and purity: HPLC ≥ 98%
Guanggancao Ding,Our company currently has more than 1000 types of traditional Chinese medicine reference samples. We have conducted comprehensive retesting of all imported products in our warehouse, striving to ensure that products with poor quality are not shipped out, and products with incomplete data are not shipped out. Each variety follows strict control, and all products undergo nuclear magnetic resonance, liquid phase, thin layer and other testing projects. We are working hard to improve our product inventory and establish deeper cooperation with domestic and other companies, striving to establish good and stable long-term cooperative relationships. We welcome new and old customers to inquire and place orders.
，There are several analytical methods for reference standards used in research, including:
1. Identification and quantification purposes using infrared spectrophotometry
2. UV quantification
3. Colorimetric quantitative method for instrument or visual comparison
4. Identification and quantification of chromatographic separation
5. A method for separation and quantification used in other liquid-liquid separation technologies
6. Separation and quantification methods for non stoichiometric relationships
7. Determination of specific rotation content
8. A method that requires a fixed proportion of known components (such as cis trans structures) for comparison.
This is divided into two parts: identification and content determination. If chromatography can be used for content determination, normalization can be used for quantification, but it cannot be expressed as a percentage of content because impurities cannot be determined. The determination of purity can be divided into two categories based on its preparation method and intended use:
1. Thermodynamic method (1) phase solubility analysis is used for impurity detection (including isomers) to determine the content. (2) Differential scanning calorimetry, but not suitable for substances that decompose during melting
2. The methods for comparing external standards include (1) chromatography TLC, HPLC, GC, (2) spectrophotometry, and other methods such as LC-MS, nuclear magnetic resonance, etc. Reference standards generally require structural confirmation,
Firstly, the four major spectra need to be analyzed, including melting point, optical rotation, elemental analysis, etc. These materials are essential for approval. If there were original reference standards, what we need to do is to conduct experiments by comparing their properties with the previous batch of samples. For areas without known substance comparisons or lack of information about their properties, research should be conducted using methods for studying new compounds, and if necessary, some auxiliary experiments should also be conducted.

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