Aspartame and Alisweet are non carbohydrate artificial sweeteners with a sweetness that is more than 2000 times that of sucrose. They have the advantages of good safety, high sweetness, and low calorie content, and are one of the substitutes for sucrose. They have stable properties and a wide range of applications, and have been approved for use in many countries, including China. The detection of Aspartame and Alisweet is of great significance for food safety and quality control. Therefore, Shanghai Tongwei Analysis Technology Co., Ltd. has established a reference method for the detection of Aspartame and Alisweet using HPLC-UV method to provide quality control.

HPLC-ELSD method is used in the Chinese Pharmacopoeia for quality control of terpenoid lactones in Ginkgo biloba leaves. This experiment analyzed the content of terpenoids in Ginkgo biloba leaves according to the method for detecting terpenoids in Ginkgo biloba leaves in the 20th edition of the Chinese Pharmacopoeia, and achieved good analysis results.

Milk thistle is the dried and ripe fruit of the Asteraceae plant, Milk thistle. Silymarin is one of the flavonoid lignans, and its main active ingredients include silibinin, isosilibinin, silibinin, and silibinin, among which silibinin accounts for the largest proportion. The analysis and detection of silymarin are of great significance for the quality control of silymarin related medicinal materials. This experiment refers to relevant national standards and uses HPLC-UV method to establish a detection method for silymarin, providing a reference method for its quality control.

Zhenqi Buxue Oral Liquid is a traditional Chinese medicine preparation composed of ingredients such as Huangqi, Sheep Placenta, Pearl, Red Ginseng, Goji Berry, Bai Zhi, Job's tears, Ginger, and Jujube. It is suitable for treating dizziness, blurred vision, pale complexion, fatigue, and speech impairment caused by insufficient qi and blood. Among them, Astragaloside IV is one of the main medicinal active ingredients. The content and relative proportion of Astragaloside IV directly affect the quality of the sample, and its quality control is particularly important.

Sanqi is the dried root and rhizome of the plant Sanqi in the Araliaceae family, which has the effects of dispersing blood stasis, stopping bleeding, reducing swelling, and relieving pain. The main active ingredients in Sanqi are Sanqi saponin R1, ginsenoside Rg1, ginsenoside Rb1, etc. The effective determination of their content is of great significance for the quality control of Sanqi medicinal materials. In accordance with the requirements of the 2020 edition of the Chinese Pharmacopoeia, this experiment used HPLC and HOLOWA core-shell chromatography column to achieve efficient separation of several saponins in Panax notoginseng medicinal materials.

NPEO is a homogenous mixture composed of different polymerization degrees and different nonyl structures. Currently, the detection methods for NPEO and its degradation products mainly include gas chromatography-mass spectrometry (GC-MS) and liquid chromatography (HPLC). Among them, HPLC detection method is relatively simple, with low reagent toxicity and the ability to simultaneously separate different EO numbers. Therefore, in this experiment, the liquid chromatography tandem evaporative light scattering detector method was used, and a special chromatographic column separation mode was configured to achieve NPEO detection with different EO numbers.

Cetearyl alcohol polyether-25 (CETETH-25) is a non-ionic emulsifier obtained by the addition of natural saturated fatty alcohols and ethylene oxide. It can be used as a leveling agent, retarder, glass fiber industry emulsifier, synthetic fiber spinning oil component, emulsifier for cosmetics and ointment production in the printing and dyeing industry.

By optimizing parameters such as detection wavelength, buffer pH, capillary size, and separation voltage, suitable analysis conditions were determined to effectively separate and detect ten cephalosporin antibiotic solutions containing concentrations of 5.0 μ g/mL, including cefuroxime, cefoxil, 7-aminocephalosporanic acid, cefuroxime, 7-aminodeacetyloxycephalosporanic acid, cefoperazone, cefotaxime, cefotaxime, and cefradine.

By using a liquid chromatography system and equipped with a special evaporative light scattering detector, the detection of chitosan content can be achieved with accuracy and high sensitivity, which can meet the requirements of daily analysis and detection.

How to achieve the detection of four sweeteners (acesulfame, saccharin, sucralose, and aspartame) in (DZY) cigarette liquid using a liquid chromatography system equipped with a special evaporative light scattering detector from Tongwei

A HPLC-ELSD method was established for the determination of saponin A content in jujube seeds, which is accurate, sensitive, simple, and rapid, and can effectively achieve quality control of jujube seeds.

Through capillary tubes. Compare the size of reference band samples with RNA/DNA fragments of a certain size. Some experiments in this application case refer to the "m" in the United States Pharmacopeia