Abstract: Disclosed in the present invention are a stabilizer for a color developing agent and application thereof, an application of a composition in preparation of the stabilizer, and a kit. A stabilizer for a color developing agent is provided in the present invention. The stabilizer includes a reducing substance and a weakly acidic buffer, and the weakly acidic buffer has a pH of 3.8-6.2. The reducing substance includes one or more of sodium sulfite, sodium bisulfite, sodium thiosulfate, or 1-mercaptoglycerol. The color developing agent includes one or two of a phenothiazine color developing agent or a triphenylmethane color developing agent. The color developing agent can be stably preserved by using the stabilizer. A method for stably preserving a color developing agent includes dissolving the color developing agent in the stabilizer.

Abstract: To the Abstract: Disclosed in the present invention are a stabilizer for a color developing agent and application thereof, an application of a composition in preparation of the stabilizer, and a kit. A stabilizer for a color developing agent is provided in the present invention. The stabilizer includes a reducing substance and a weakly acidic buffer, and the weakly acidic buffer has a pH of 3.8-6.2. The reducing substance includes one or more of sodium sulfite, sodium bisulfite, sodium thiosulfate, or 1-mercaptoglycerol. The color developing agent includes one or two of a phenothiazine color developing agent or a triphenylmethane color developing agent. The color developing agent can be stably preserved by using the stabilizer. A method for stably preserving a color developing agent includes dissolving the color developing agent in the stabilizer.

Abstract: Disclosed is a kit for testing a COVID-19 antigen. The kit includes a test card, a conjugate pad and a reaction pad being arranged on the test card; wherein the conjugate pad is provided with a labeled antibody Ab1 and a labeled antibody Ab3 of the COVID-19 antigen, and a quality control line and a test line are arranged in parallel with an interval on the reaction pad, the test line being provided with a coating antibody Ab2, and the quality control line being provided with a coating antibody Ab4. With the kit, by the AIE immunofluorescence chromatographic technique, the AIE fluorescent microspheres are used as labels, and the test result of the test card is directly determined and read by using a fluorescent flashlight, or the test result is read by using a fluorescent tester. Such kits have the advantages of high sensitivity, strong specificity and simple operation.

Abstract: The embodiments of the present application, belonging to the technical field of medical test and assay, and provide a preservative for an in vitro diagnostic reagent. The preservative includes a combination of a sulfadoxine solution and a dimethoprim solution, wherein a molar ratio of sulfadoxine in the sulfadoxine solution to dimethoprim in the dimethoprim solution is from 0.002 to 1. The present disclosure also provides use of the preservative for the in vitro diagnostic reagent. The technical solutions according to the embodiments of the present disclosure improve stability of the reagent, do not affect reactions of the reagent, and may be extensively applied.

Abstract: The present disclosure provides a liquid-based cell preservation solution and a method for preparing the same. The preservation solution includes, by mass percentage: 15 to 20% of an alcohol, 0.4 to 0.7% of a buffer component, 0.2 to 0.5% of an ionic strength modifying agent, 0.05 to 2% of an anticoagulant, 0.05 to 0.2% of a mucus dissociating agent, 0.5 to 0.9% of a preservative, and purified water as the balance. The components of cell preservation solution are set reasonably, and the cells may be preserved at normal temperature for a long time to maintain the cell morphology. Addition of the mucus dissociating agent may effectively soften cell mucus, and separates cells adhered by mucus in the sample, thereby preventing cell accumulation. Addition of the preservative may effectively inhibit the proliferation of mold, bacteria or other pathogens and facilitate cell preservation.