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In order determine silicon dioxide content in toothpaste, dried toothpaste was fused by sodium peroxide and acidized by HCl, then silicon molybdenum yellow was reduced to silicon molybdenum blue by adding molybdenum blue color reagent,  its absorbance value at 680 nm wavelength was determined. The precision of this method (RSD, n=12) is 0.88%, the recovery rate is 96.8%~103.7%. The test results of this method are stable and reliable.

Silicon dioxide used in toothpaste, has more than 30 years of history.

The present invention discloses a method for preparing a silica-coated cerium sulfide red pigment, toner suspension and a silicon source solution is first prepared, and then in a molar ratio of Si4 + :Ce2S3 = 1 ~ 3:1 ~ 2, a silicon source solution 0.02 ~ 0.15 ml / min rate of the toner was added to the suspension stirred for the reaction, the reaction product was washed and dried to obtain a precursor powder; after the precursor powder was calcined in a non-oxidizing atmosphere to give a dense package silica-coated cerium sulfide red pigment.

Preparation contained curcumin (Cur) mesoporous silicon dioxide nanoparticles (MSN), evaluate the drug release behavior and anti-tumor activity. Polymerization method using MSN, and the use of the solvent evaporated to dryness and impregnation centrifugal load Cur prepared the MSN (Cur-MSN), encapsulation efficiency and drug loading for the index to optimize the preparation process.



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