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Journal of Peking University(Health Sciences) ›› 2019, Vol. 51 ›› Issue (5): 907-912. doi: 10.19723/j.issn.1671-167X.2019.05.019

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Preparation of aspirin sustained-release microsphere and its in vitro releasing

Ying CHEN1,Zhong-ning LIU1,Bo LI2,△(),Ting JIANG1,△()   

  1. 1. Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
    2. Chongqing Key Laboratory of Nano/Micro Composite Materials and Devices, Chongqing University of Science and Technology, Chongqing 401331, China
  • Received:2017-09-28 Online:2019-10-18 Published:2019-10-24
  • Contact: Bo LI,Ting JIANG E-mail:15011229485@139.com;Leewave@126.com
  • Supported by:
    Supported by the Youth Program of National Natural Science Foundation of China(81400498);the General Program of National Natural Science Foundation of China(81771045);the Natural Science Key Foundation Project of Chongqing(CSTC2016JCYJA0541);and the Scientific and Technological Research Program of Chongqing Municipal Education Commission(KJ1601301)

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Abstract:

Objective: It has been proven that acetylsalicylic acid (aspirin), as a kind of classical non-steroidal anti-inflammatory drug, not only has the effect of anti-inflammatory, but also has the function of immunity regulation and mineralization. However, it needs further investigation to study how to delay release of aspirin for a long time and enable to promote bone regeneration. Herein, we demonstrated that the long-term delayed release pattern of aspirin through the construction of microsphere scaffolds is promising to achieve the excellent bone regeneration. Methods: Here we synthesized three kinds of scaffolds as follows: (1) aspirin loaded calcium silicate (CaSiO3) microsphere (CaSiO3-aspirin) via simple immersion; (2) aspirin loaded polylactic-co-glycolic acid (PLGA) microsphere (PLGA-aspirin) via oil/water (O/W) emulsion; (3) aspirin loaded PLGA-CaSiO3 scaffold (PLGA-CaSiO3-aspirin) via O/W emulsion, optimal morphology and structure of PLGA-CaSiO3-aspirin scaffold was acquired through modulating the ratio between PLGA and CaSiO3. Furthermore, spectrophotometer was used to monitor the concentration of the extract of the three scaffolds for different releasing time, including 1, 2, 4, 6, 9, 13, 17, 21, 24, 30, 36, and 45 days, aspirin loading efficiency and its accumulation releasing curves were both achieved according to the concentration of aspirin. Their sustained release effects of aspirin were evaluated eventually. Results: Environmental scanning electron microscope (ESEM) results showed that the surface structure of the three kinds of scaffolds were smooth and had uniform size distribution. In addition, a small amount of PLGA-aspirin microspheres occurred to aggregation, while a small amount of CaSiO3-aspirin microspheres were broken. Moreover, the PLGA-aspirin microspheres in the PLGA-CaSiO3-aspirin scaffolds were uniformly adhered to the surface of CaSiO3 microspheres. The aspirin loadings of CaSiO3-aspirin, PLGA-aspirin, and PLGA-CaSiO3-aspirin were (1.06±0.04)%, (7.05±0.06)%, and (6.75±0.18)%, respectively. In addition, their corresponding time for releasing 95% of aspirin was 3, 24, and 36 days, respectively. The releasing time of PLGA-CaSiO3-aspirin was longer than that of the others and the releasing rate was more stable. Conclusion: The microsphere scaffold of PLGA-CaSiO3-aspirin composites has excellent delayed-release effect on aspirin, which is promising for using as osteogenic materials.

Key words: Aspirin, Sustained-release microsphere, Anti-inflammatory, Osteogenesis

CLC Number: 

  • R944

Table 1

The compositions of three kinds of scaffolds"

Scaffold Aspirin (w/v) PLGA (w/v) PVA (w/v) CaSiO3 (w/v)
CaSiO3+aspirin 1% 0 0 10%
PLGA+aspirin 1% 10% 2% 0
PLGA+CaSiO3+aspirin 1% 10% 2% 10%-20%

Figure 1

Scanning electron microscope photographs and size distribution of the three kinds of scaffolds A-C, CaSiO3+aspirin; D-F, PLGA+aspirin; G-I, PLGA+CaSiO3+aspirin."

Figure 2

Standard curve of aspirin (A) and aspirin loading efficiency of scaffolds (B)"

Figure 3

In vitro release of scaffolds loaded with aspirin"

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