食品科学

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基于罗丹明B磺酸钠脂质体生物传感器检测免疫球蛋白

严喜鸾,肖 竦,曾哲灵   

  1. 1.南昌大学环境与化学工程学院,江西 南昌 330031;2.贵阳医学院化学教研室,贵州 贵阳 550004;
    3.南昌大学 食品科学与技术国家重点实验室,江西 南昌 330047
  • 出版日期:2013-09-25 发布日期:2013-09-27

Detection of Human IgG with Biosensor Based on SRB-Encapsulated Liposomes

YAN Xi-luan,XIAO Song,ZENG Zhe-ling   

  1. 1. School of Environment and Chemical Engineering, Nanchang University, Nanchang 330031, China;
    2. Chemistry Teaching and Research Section, Guiyang Medical College, Guiyang 550004, China;
    3. State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China
  • Online:2013-09-25 Published:2013-09-27

摘要:

目的:基于罗丹明B磺酸钠负载的荧光脂质体构建生物传感器,实现对人免疫球蛋白(hIgG)的高灵敏分析检测。方法:以磁性微球作为分离和富集载体,采用薄膜水化法将荧光物质罗丹明B磺酸钠盐(SRB)包裹在脂质体的内水相中,结合免疫夹心反应模式,构建基于荧光脂质体的人免疫球蛋白生物传感器;免疫反应结束后,加入无水乙醇破脂质体膜,从而瞬间释放出脂质囊内的大量SRB分子,实现对hIgG抗原的高灵敏度荧光分析。考察SRB脂质体在10d内的稳定性,优化磁性微球和生物素化抗体用量等条件。结果:荧光脂质体稳定性较好,hIgG的测定线性范围为1~200ng/mL,最低检出质量浓度为1ng/mL(即6.25pmol/L)。结论:该方法无需标记、快速、简便、灵敏,为免疫球蛋白的高灵敏度检测提供了一种新途径。

关键词: 脂质体, 磁性微球, 免疫球蛋白, 生物传感器, 荧光分析

Abstract:

Purpose: To fabricate a biosensor based on sulforhodamine B sodium salt (SRB)-encapsulating liposomes
for highly sensitive detection of human IgG (hIgG). Methods: An immunoliposome encapsulating SRB was prepared
and used to develop a fluorescent biosensor by the film dispersion method. Magnetic beads (MB) were employed as
the immobilization and separation carrier. By enzyme-linked immunospecific assay (ELISA) method, MB modified
anti-IgG antibodies were linked to SRB-encapsulating liposomes, which instantaneously released a great quantity of
SRB molecules upon alcohol addition, resulting in highly sensitive fluorescent detection of hIgG. SRB-encapsulating
liposomes had good stability in 10 days. The optimized condition was as follows: 60 μg of MB modified anti-IgG
antibody and 0.2 μg of biotin-labeled anti-IgG antibody Results: The lowest detectable concentration of hIgG was 1 ng/mL (6.25
pmol/L), and the linear range was 1 to 200 ng/mL. Conclusions: This lable-free protocol can provide a rapid, simple and
sensitive approach to detecting IgG.

Key words: liposomes, magnetic beads, immunoglobulin, biosensor, fluorescent analysis