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Simulated body fluid

Summary

A simulated body fluid (SBF) is a solution with an ion concentration close to that of human blood plasma, kept under mild conditions of pH and identical physiological temperature.[1] SBF was first introduced by Kokubo et al. in order to evaluate the changes on a surface of a bioactive glass ceramic.[2] Later, cell culture media (such as DMEM, MEM, α-MEM, etc.), in combination with some methodologies adopted in cell culture, were proposed as an alternative to conventional SBF in assessing the bioactivity of materials.[3]

Applications edit

Surface modification of metallic implants edit

For an artificial material to bond to living bone, the formation of bonelike apatite layer on the surface of an implant is of significant importance. The SBF can be used as an in vitro testing method to study the formation of apatite layer on the surface of implants so as to predict their in vivo bone bioactivity.[4] The consumption of calcium and phosphate ions, present in the SBF solution, results in the spontaneous growth of bone-like apatite nuclei on the surface of biomaterials in vitro. Therefore, the apatite formation on the surface of biomaterials, soaked in the SBF solution, is considered a successful development of novel bioactive materials.[5] The SBF technique for surface modification of metallic implants is usually a time-consuming process, and obtaining uniform apatite layers on substrates takes at least 7 days, with daily refreshing of the SBF solution.[6] Another approach for decreasing the coating time is to concentrate the calcium and phosphate ions in the SBF solution. Enhanced concentration of calcium and phosphate ions in SBF solution accelerates the coating process and, in the meantime, eliminates the need for regular replenishment of the SBF solution.

Gene delivery edit

An attempt was made to investigate the application of SBF in gene delivery.[7] Calcium phosphate nanoparticles, required for the delivery of plasmid DNA (pDNA) into the nucleus of the cells, were synthesized in a SBF solution and mixed with pDNA. The in vitro studies showed higher gene delivery efficiency for the calcium-phosphate/DNA complexes made of SBF solution than for the complexes prepared in pure water (as control).

Formulation edit

Ionic concentrations (mM) of blood plasma and proposed SBF formulations[8]
Formulation Na+
 K+
 Mg2+
 Ca2+
 Cl−
 HCO−
3		 HPO2−
4		 SO2−
4		 Buffer
Blood plasma [9] 142.0 5.0 1.5 2.5 103.0 27.0 1.0 0.5 -
Original SBF [10] 142.0 5.0 1.5 2.5 148.8 4.2 1.0 0 Tris
Corrected (c-SBF) [11] 142.0 5.0 1.5 2.5 147.8 4.2 1.0 0.5 Tris
Tas-SBF [12] 142.0 5.0 1.5 2.5 125.0 27.0 1.0 0.5 Tris
Bigi-SBF [9] 141.5 5.0 1.5 2.5 124.5 27.0 1.0 0.5 HEPES
Revised (r-SBF) [13] 142.0 5.0 1.5 2.5 103.0 27.0 1.0 0.5 HEPES
Modified (m-SBF) [13] 142.0 5.0 1.5 2.5 103.0 10.0 1.0 0.5 HEPES
Ionized (i-SBF) [13] 142.0 5.0 1.0 1.6 103.0 27.0 1.0 0.5 HEPES
Improved (n-SBF) [14] 142.0 5.0 1.5 2.5 103.0 4.2 1.0 0.5 Tris

References edit

  1. ^ Kokubo, T. (1991). "Bioactive glass ceramics: properties and applications". Biomaterials. 12 (2): 155–163. doi:10.1016/0142-9612(91)90194-F. PMID 1878450.
  2. ^ Kokubo, T.; Kushitani, H.; Sakka, S.; Kitsugi, T.; Yamamuro, T. (1990). "Solutions able to reproduce in vivo surface-structure changes in bioactive glass–ceramic A–W". Journal of Biomedical Materials Research. 24 (6): 721–734. doi:10.1002/jbm.820240607. PMID 2361964.
  3. ^ Lee, J.; Leng, Y.; Chow, K.; Ren, F.; Ge, X.; Wang, K.; Lu, X. (2011). "Cell culture medium as an alternative to conventional simulated body fluid". Acta Biomaterialia. 7 (6): 2615–22. doi:10.1016/j.actbio.2011.02.034. PMID 21356333.
  4. ^ Chen, Xiaobo; Nouri, Alireza; Li, Yuncang; Lin, Jiangoa; Hodgson, Peter D.; Wen, Cuie (2008). "Effect of Surface Roughness of Ti, Zr and TiZr on Apatite Precipitation from Simulated Body Fluid". Biotechnology and Bioengineering. 101 (2): 378–387. doi:10.1002/bit.21900. PMID 18454499. S2CID 10949202.
  5. ^ Kokubo, T.; Takadama, H. (2006). "How useful is SBF in predicting in vivo bone bioactivity?". Biomaterials. 27 (15): 2907–2915. doi:10.1016/j.biomaterials.2006.01.017. PMID 16448693.
  6. ^ Li, P.; Ducheyne, P. (1998). "Quasi-biological apatite film induced by titanium in a simulated body fluid". Journal of Biomedical Materials Research. 41 (3): 341–348. doi:10.1002/(SICI)1097-4636(19980905)41:3<341::AID-JBM1>3.0.CO;2-C. PMID 9659601.
  7. ^ Nouri, Alireza; Castro, Rita; Santos, Jose L.; Fernandes, Cesar; Rodrigues, J.; Tomás, H. (2012). "Calcium phosphate-mediated gene delivery using simulated body fluid (SBF)". International Journal of Pharmaceutics. 434 (1–2): 199–208. doi:10.1016/j.ijpharm.2012.05.066. PMID 22664458. S2CID 1602169.
  8. ^ Yilmaz, Bengi & Evis, Zafer (October 2016). "Chapter 1: Biomimetic coatings of calcium phosphates on titanium alloys". In Webster, Thomas & Yazici, Hilal (eds.). Biomedical Nanomaterials: From Design To Implementation. The Institution of Engineering and Technology. pp. 3–14. doi:10.1049/PBHE004E_ch1. ISBN 9781849199650.
  9. ^ a b Bigi, Adriana; Boanini, Elisa; Bracci, Barbara; Facchini, Alessandro; Panzavolta, Silvia; Segatti, Francesco; Sturba, Luigina (2005). "Nanocrystalline hydroxyapatite coatings on titanium: a new fast biomimetic method". Biomaterials. 26 (19): 4085–4089. doi:10.1016/j.biomaterials.2004.10.034. ISSN 0142-9612. PMID 15664635.
  10. ^ Kokubo, Tadashi; Takadama, Hiroaki (2006). "How useful is SBF in predicting in vivo bone bioactivity?". Biomaterials. 27 (15): 2907–2915. doi:10.1016/j.biomaterials.2006.01.017. ISSN 0142-9612. PMID 16448693.
  11. ^ Cui, Xinyu; Kim, Hyun-Min; Kawashita, Masakazu; Wang, Longbao; Xiong, Tianying; Kokubo, Tadashi; Nakamura, Takashi (2010). "Apatite formation on anodized Ti-6Al-4V alloy in simulated body fluid". Metals and Materials International. 16 (3): 407–412. Bibcode:2010MMI....16..407C. doi:10.1007/s12540-010-0610-x. ISSN 1598-9623. S2CID 137643093.
  12. ^ Cüneyt Tas, A (2000). "Synthesis of biomimetic Ca-hydroxyapatite powders at 37°C in synthetic body fluids". Biomaterials. 21 (14): 1429–1438. doi:10.1016/S0142-9612(00)00019-3. ISSN 0142-9612. PMID 10872772.
  13. ^ a b c Oyane, Ayako; Onuma, Kazuo; Ito, Atsuo; Kim, Hyun-Min; Kokubo, Tadashi; Nakamura, Takashi (2003). "Formation and growth of clusters in conventional and new kinds of simulated body fluids". Journal of Biomedical Materials Research. 64A (2): 339–348. doi:10.1002/jbm.a.10426. ISSN 0021-9304. PMID 12522821.
  14. ^ Takadama, Hiroaki; Hashimoto, Masami; Mizuno, Mineo; Kokubo, Tadashi (2004). "Round-Robin Test of SBF for In Vitro Measurement of Apatite-Forming Ability of Synthetic Materials". Phosphorus Research Bulletin. 17: 119–125. doi:10.3363/prb1992.17.0_119. ISSN 0918-4783.

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