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文章编号:1672-6987(2026)05-0019-10;DOI:10. 16351/j. 1672-6987. 2026. 05. 002
李可欣,叶素娟* (青岛科技大学 化学与分子工程学院,山东 青岛 266042)
摘 要:采用传统方法制备球形核酸分子纳米探针,其制备时间长、稳定性差、易聚集沉降。 为了解决这些问题,本工作开发了新型的球形核酸分子纳米探针合成技术——BSPP 冰冻法。 首先,制备表面修饰双苯基膦(对磺化苯基)二水合二钾(BSPP)的纳米金颗粒,以 DNA 和 BSPP 修饰纳米金为原料,利用反应溶液在冰冻时产生的冰晶结构,作为微反应器,制备 DNA-AuNPs 球形核酸分子(SNM)。与传统方法比较,BSPP 冰冻法有以下优点:1)BSPP 在 金纳米颗粒(AuNPs)表面形成稳定的单分子层,增强纳米粒子胶体溶液的稳定性;2)冰晶反 应室可以使 AuNPs 与巯基 DNA 局域浓度升高,可提高反应效率。该方法利用加盐、循环升 温、循环冻融等多种方式证明合成的 SNM 在保留自组装能力的前提下,具有良好的稳定性, 并且制备时间短(2 h),消耗 DNA 试剂少,制备方法简单。在此基础上,本工作进一步通过 BSPP 冰冻法,成功合成了稳定性良好、结构可控的的多聚体 SNM,为 DNA 自组装纳米金探 针的制备提供了一种新的可行的方法。
关键词:冰冻法;金纳米颗粒;球形核酸分子
中图分类号:O 657. 38 文献标志码:A
引用格式:李可欣,叶素娟 . BSPP 冰冻法制备球形核酸分子[J]. 青岛科技大学学报(自然科 学版),2026,47(5):19-28.
LI Kexin, YE Sujuan. Preparation of spherical nucleic acid molecules by BSPP freezing method[J]. Journal of Qingdao University of Science and Technology(Natural Science Edition),2026,47(5):19-28.
Preparation of Spherical Nucleic Acid Molecules by BSPP Freezing Method
LI Kexin,YE Sujuan (College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China)
Abstract:The traditional method for preparing spherical nucleic acid molecular nanoprobes has long preparation time, poor stability and easy aggregation and sedimentation. In order to solve these problems, a new synthesis technique of spherical nucleic acid molecular nanoprobes, BSPP freezing method, was developed in this paper. Firstly, gold nanoparticles with surface modified diphenylphosphine (p-sulfonated phenyl) dipotassium dihydrate (BSPP) were prepared. Using DNA and BSPP-modified gold nanoparticles as raw materials, DNA-AuNPs spherical nucleic acid molecules (SNM) were prepared by using the ice crystal structure generated during freezing of the reaction solution as a microreactor. Compared with traditional methods, BSPP freezing method has the following advantages:1) BSPP forms a stable monolayer on the surface of gold nanoparticles (AuNPs), which enhances the stability of the colloidal solution of nanoparticles;2) The local concentration of AuNPs and sulfhydryl DNA can be increased in the ice crystal reaction chamber, which can improve the reaction efficiency. In this method, salt addition, cyclic heating, cyclic freeze-thaw and other methods were used to prove that the synthesized SNM had good stability, short preparation time (2 h), less consumption of DNA reagents, and simple preparation method while retaining self-assembly capability. On this basis, we have successfully synthesized SNM with good stability and controllable structure by BSPP freezing method, which provides a new feasible method for the preparation of DNA self-assembly gold nanoprobes.
Key words:freezing-method; gold nanoparticles; spherical nucleic acid molecules
收稿日期:2025-10-22
基金项目:国家自然科学基金项目(22274085).
作者简介:李可欣(1999—),女,硕士研究生 . * 通信联系人 .