Analysis on Evaluation Technology of Cosmetics Protective Effect

Cosmetics are closely related to people's lives, so the safety requirements for cosmetics are getting higher and higher. People not only require skin care and beauty, but also require health and sustainability. Therefore, whether it is manufacturers, national regulatory agencies, and consumers, they are very Attaches great importance to the safety of cosmetics, so what are the requirements for safety testing of cosmetics? What are the testing indicators? As well as the requirements of safety level, this article focuses on the technical evaluation methods of cosmetics.　　　　 1. Appearance comparison 　　 Compare the appearance of cosmetic raw materials, contents, and packaging materials to ensure that each batch meets the quality requirements.　　　　2. Color comparison 　　 Compare the colors of cosmetic raw materials, contents, and packaging materials to ensure that each batch meets the quality requirements.　　　　3. Smell comparison　　 usually use scent sticks and olfactory comparison to ensure that each batch meets the quality requirements.　　　　4. The rheological properties of the paste play a vital role in the performance of the product. The rheological properties of the paste are studied by a rheometer to provide a reference for production and formulation improvement. Typical equipment is the Haake RS 1 rheometer from Thermo Fisher.　　　　 5. Instant smearing feel comparison 　　 online quality assurance use, to compare the instant smearing feel of the produced paste with the standard sample.　　　　 6. Foreign body inspection 　　 Scrape the paste evenly on black and white paper with a spatula to check whether there are foreign bodies or agglomerated particles.　　　　 7. pH value detection 　　 Use an acid meter to test the pH value of cosmetic raw materials and pastes to ensure that the various indicators of cosmetic raw materials and pastes meet the standards.　　　　 8. Density detection 　　 checks the density of cosmetic raw materials and pastes to ensure that the various indicators of cosmetic raw materials and pastes meet the standards. The equipment at Anton Paar in Austria is good.　　　　 9. Viscosity testing 　　 checks the viscosity of cosmetic raw materials and pastes to ensure that the various indicators of cosmetic raw materials and pastes meet the standards. The viscosity test equipment of Brookfield, USA is usually used.　　　　10. The professional optical microscope compares with the 　　OLYMPUS BX43 research-grade microscope with 1000 times optical resolution, polarized light function to observe the particle size and liquid crystal structure of cosmetic emulsion. 11. Platinum-cobalt colorimetric method. Platinum-cobalt colorimetry colorimeter is used to measure the color produced by the substance in the dissolved state. The instrument uses the platinum-cobalt color standard solution specified in the national standard GB5750 for calibration. 'As the unit of chromaticity measurement. 12. Refractive index and average dispersion test Abbe refractometer is an instrument that can measure the refractive index nD and average dispersion nF-nC of transparent, translucent liquids or solids. The refractive index and average dispersion are one of the important optical constants of substances, which can be used Understand the optical properties, purity, and dispersion of substances.　　　　 13. Conductivity test 　　 checks the conductivity of cosmetic raw materials to ensure that the various indicators of cosmetic raw materials and pastes meet the standards, such as testing whether the water used for cosmetics production is qualified.　　　　14. Total organic carbon content test 　　Total Organic Carbon (TOC) test is a comprehensive indicator of carbon content indicating the total amount of organic matter in a water body, and can be used to test the quality of cosmetics production water.　　　　 15. Moisture content test 　　 The determination of the moisture content in the paste usually uses the Karl Fischer method. Moisture analyzer from Metrohm, Switzerland.　　　　 16. Measurement of loss on drying 　　 loss on drying refers to the weight loss of raw materials after drying to constant weight under specified conditions, usually expressed as a percentage. Loss on drying determination can be used to detect the content of volatile components in cosmetic raw materials. Usually use the method of drying at 105°C for 3 hours.　　　　 17. Ignition Residue Test The purpose of the ignition residue inspection is to check the inorganic impurities introduced in the raw materials. It is usually carried out using a muffle furnace.　　　　18. DSC differential thermal analysis 　　Differential thermal analysis is an analytical method that measures the thermal effects of physical or chemical changes during the heating (or cooling) process of a sample to study material transformation and chemical reactions. It is mainly used to test the purity of crystals and the glass transition temperature of polymers.　　　　19. Potentiometric titration The potentiometric titrator can accurately and quickly determine the acid value, hydroxyl value, saponification value, iodine value, peroxide value and other indicators of cosmetic raw materials. It can be divided into oxidation-reduction titration, acid-base potentiometric titration, precipitation titration, etc. Swiss Metrohm is the leader in potentiometric titrators.　

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