新型铽配合物掺杂SiO_2荧光纳米粒子的制备

以荧光物质铽的配合物为核,二氧化硅为外壳,制备了大小均匀的新型稀土配合物荧光纳米粒子。实验采用油包水的反相微乳液法,在四乙氧基硅烷和3-氨丙基三乙氧基硅烷(APTEOS)的共水解下进行。通过透射电子显微镜(TEM)观察,所得的纳米粒子呈球形,大小均匀,直径在30 nm左右。纳米粒子呈现很强的铽配合物发光,且发光性质十分稳定。可通过表面的氨基方便地与生物分子偶联,可作为一种优秀的时间分辨荧光标记物。

丹酰氯SiO_2纳米发光标记物的制备

通过合成丹酰氯的荧光单体硅酯前驱物,采用油包水的反相微乳液法,以丹酰氯的荧光单体硅酯前驱物为核材料,成功地制备了丹酰氯的荧光纳米颗粒,克服了传统方法制备核壳荧光纳米颗粒中存在的荧光染料泄漏问题。通过透射电子显微镜表征该纳米粒子呈球形,大小均匀,直径为40 nm左右。所制得纳米颗粒荧光性质稳定,受外界环境的影响小,且潜在生物亲和性,是一种新型的荧光标记物。

Novel Terbium Chelate Doped Fluorescent Silica Nanoparticles

Novel terbium chelate doped silica fluorescent nanoparticles were prepared and characterized. The preparation was carried out in water-in-oil （W/O） microemulsion containing monomer precursor （pAB-DTPAA-APTEOS）, Triton X-100, n-hexanol, and cyclohexane by controlling copolymerization of tetraethyl orthosilicate and 3-aminopropyl-triethyloxysilane. The nanoparticles are spherical and uniform in size, about 30 nm in diameter, strongly fluorescent, and highly stable. The amino groups directly introduced to the surface of the nanoparticles using APTEOS during preparation made the surface modification and bioconjugation of the nanoparticles easier. The nanoparticles are expected as an efficient timeresolved luminescence biological label.

非离子表面活性剂中环氧乙烷残留量测定

建立了非离子表面活性剂中环氧乙烷残留量的顶空气相色谱-质谱(HS-GC/MS)分析方法,样品经80℃、60 min顶空加热平衡后进行GC/MS分离检测和外标法定量。该方法对环氧乙烷的定量限(LOQ)为0.25 mg/kg,在0.25~10 mg/kg浓度范围内线性良好,方法精密度3.4%~8.7%。结果显示,该方法具有准确灵敏和简单快速等特点,将其应用于表面活性剂检测可取得良好效果。