Preparation method and application of nanocomposite material for inhibiting postoperative tumor recurrence
A nano-composite material and tumor technology, which is applied in the direction of anti-tumor drugs, medical preparations with non-active ingredients, medical preparations containing active ingredients, etc. It can solve the problems of unsatisfactory EPR effect and achieve the purpose of retaining the activity of nano-anticancer drugs , Inhibition of tumor recurrence, little effect
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[0032] A preparation method and application of a nanocomposite material for inhibiting postoperative tumor recurrence, the method comprising the following steps: (a) the curve of the fluorescence intensity of Dox as a function of concentration; (b) Dox is loaded in MSN; (c) Calculation of loading ratio; (d) DMSN mixed with PCL and hot-pressed; (e) Characterization of the prepared nanocomposite; (f) Determination of in vitro drug release profile; (g) In vitro cytotoxicity test; (h) In vivo stability and degradability tests.
[0033] Specifically, a method for preparing a nanocomposite material for inhibiting postoperative tumor recurrence, the method includes the following steps:
[0034] S1: First prepare Dox solutions with different concentrations, and use a fluorescence spectrophotometer to measure the fluorescence intensity of each solution at the emission wavelength, thereby obtaining the variation curve of the Dox fluorescence intensity at the emission wavelength with con...
Embodiment 1
[0049] 1. First prepare Dox solutions with different concentrations. The specific Dox solutions are: 0.025 μg / mL, 0.05 μg / mL, 0.1 μg / mL, 0.2 μg / mL, 0.4 μg / mL, 0.8 μg / mL, 1.6 μg / mL, Using a fluorescence spectrophotometer, the excitation wavelength is 485nm, the emission wavelength is 575nm, the fluorescence intensity of each solution at 575nm is measured, and the curve of Dox fluorescence intensity at 575nm with concentration is drawn.
[0050] 2. Take 6mL Dox mother liquor with a concentration of about 0.5mg / mL and mix it with 5mg MSN. Before mixing, measure the fluorescence intensity of the mother liquor at 575nm, and calculate the precise concentration C of the mother liquor through the above curve. 母 . After mixing evenly, stir for 12 hours under the condition of avoiding light, and the rotation speed is 500 rpm.
[0051] 3. After 12 hours, take out the solution and centrifuge, the speed of the centrifuge is: 8000rpm, and the centrifugation time: 20min. After the centrifu...
Embodiment 2
[0058] 1. First prepare Dox solutions with different concentrations. The specific Dox solutions are: 0.025 μg / mL, 0.05 μg / mL, 0.1 μg / mL, 0.2 μg / mL, 0.4 μg / mL, 0.8 μg / mL, 1.6 μg / mL, Using a fluorescence spectrophotometer, the excitation wavelength is 485nm, the emission wavelength is 575nm, the fluorescence intensity of each solution at 575nm is measured, and the curve of Dox fluorescence intensity at 575nm with concentration is drawn.
[0059]2. Take 6mL Dox mother liquor with a concentration of about 0.5mg / mL and mix it with 5mg MSN. Before mixing, measure the fluorescence intensity of the mother liquor at 575nm, and calculate the precise concentration C of the mother liquor through the above curve. 母 . After mixing evenly, stir for 12 h under the condition of avoiding light (rotating speed 500 rpm).
[0060] 3. After 12 hours, take out the solution and centrifuge (speed: 8000rpm, time: 20min). After the centrifugation was completed, the supernatant was taken out, and the p...
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