Synthetic dye--inorganic salt hybrid colorants for application in thermoplastics.

Common synthetic dyes, e.g., Weak Acid Pink Red B (APRB, C.I. 18073), Mordant Blue 9 (MB, C.I.14855) and Acid Brilliant Blue 6B (ABB6B, C.I. 42660), can be removed from water by in situ hybridization with CaCO(3), BaSO(4) and Ca(3)(PO(4))(2) and the resulting hybrids thus prepared used as plastic colorants. All the hybrids can be processed into polypropylene (PP) at 200 °C with good color intensity, color brightness and homogeneous dispersion. The BaSO(4)-MB hybrid exhibits better migration resistance to acid and alkali, and stronger covering power than the BaSO(4)-MB mixture. The thermal stability and UV resistance of the Ca(3)(PO(4))(2)-ABB6B hybrid are better than those of the Ca(3)(PO(4))(2)-ABB6B mixture. The crystallinity of PP is enhanced by incorporation of these hybrids and the use of these hybrids as colorants in PP instead of the dyes alone is determined to be feasible.

[Adhesion of osteoblasts on the novel titanium alloy with bioactivity and wear coating].

OBJECTIVE: The purpose of this study was to evaluate the rugosity with both of the bioactivity and the wear coating of a new type titanium implant material Ti-Zr-Sn-Mo-Nb(TZS), and to investigate the adhesion of osteoblasts on different coating surface. METHODS: Both surface topography of bioactivity and wear coating were examined with scanning electron microscope (SEM). The average roughness of two kinds coating were measured by portable roughometer. We examined the dynamic behavior of early adhesion of the osteoblasts, which were cultured on different coating surface of titanium alloy. As a marker of cell adhesions, cytoskeleton proteins were tagged by F-actin agent. Additionally, the number of adhesion cells was investigated by biological assay MTT. These results were compared with those founds in the control. RESULTS: Bioactivity-coating with pore structure and wear-coating with irregular pitting corrosion were observed. Roughometer examination revealed that the roughness of different disc was increased. The control bioactivity-coating surface was the most rough, followed by wear-coating and then the control. Bioactivity coating had best cell biocompatibility, in that the highest cell adhesion ratio was detected. It was very likely that bioactivity coating possessed of biomimetic character and roughness surface. Wear coating had similar biocompatible in comparison with bioactivity coating. The cytoskeleton protein of cell formed a fibrillar structure on bioactivity and wear coating. Cytoskeleton tensin was heterogeneously distributed on variety of surface depending on different surface topography. CONCLUSION: The new titanium alloy shows rough surface after surface treatment, and then cell adhesion and morphology, cytoskeleton protein present wea on bioactivity-coating and wear-coating.

[Studying the biocompatibility of implant titanium alloy after surface treatment by sandblasting and etching].

OBJECTIVE: The aim of this study was to investigate the in vitro effect of cell behavior on a new titanium alloy and coarsening surface with sandblasting and duplicate treated by sandblasting and acid etching (SLA), including cell proliferation, morphology as well as alkaline phosphatase expression. METHODS: The cell derived from calvarial bone of neonate and co-cultured with the surface treated titanium alloys in vitro. The samples were treated by mechanical polishing, the sandblasting and the SLA. Cell proliferation on samples for 3 d was examined by MTT assay and cell morphology was observed by scan electron microscope. Alkaline phosphatase activity was measured at 5 d by ALP-special assay. RESULTS: The sandblasting and the SLA surface showed a significant different to smooth surface in the proliferation osteoblasts. The cells were elongated and spread well and having plentiful filopods on the coarse surface. The basal ALP activity indicated that optical density value of osteoblasts was not significant difference between coarse surface and smooth surface. CONCLUSION: The observed effects are attributed to coarsening surface and support the concept that roughness can enhance the differentiation, good morphology and alkaline phosphatase expression of the cells. These results suggest that the good biological performance evaluation of sandblasting and etching surface is merited.