化学学报 ›› 2009, Vol. 67 ›› Issue (23): 2703-2708. 上一篇    下一篇

研究论文

两种环境敏感高分子在相分离免疫分析中的比较研究

林 鹏*,冯建军,王艺磊,谢芳靖,王为刚,陈 芸,黄利强   

  1. (集美大学水产学院 水产科学技术与食品安全省高校重点实验室 厦门 361021)
  • 投稿日期:2009-08-10 修回日期:2009-11-06 发布日期:2009-11-18
  • 通讯作者: 林鹏 E-mail:linpeng@jmu.edu.cn; xmlinpeng@163.com

Comparative Study of Two Environment-sensitive Polymers in Phase Separation Immunoassay

Lin, Peng*,Feng, Jianjun,Wang, Yilei,Xie, Fangjing, Wang, Weigang,Chen, Yun,Huang, Liqiang   

  1. (Key Laboratory of Science and Technology for Aquaculture and Food Safety, Fisheries College, Jimei University, Xiamen 361021)
  • Received:2009-08-10 Revised:2009-11-06 Published:2009-11-18

进行了两种环境敏感高分子在相分离免疫分析嗜水气单胞菌外膜蛋白(outer membrane protein, OMP)中的比较研究. 首先合成温度敏感高分子聚N-异丙基丙烯酰胺和pH敏感高分子聚(N-异丙基丙烯酰胺-甲基丙烯酸), 分别以N-羟基琥珀酰亚胺丙烯酸酯(NAS)和碳二亚胺(EDCI)作为偶联剂与抗OMP抗体(Ab)偶联形成抗体复合物(Ab-polymer), 在竞争型免疫测定中, OMP标准溶液与异硫氰酸荧光素标记OMP在均相条件下竞争性地与Ab-polymer反应, 调节外界环境分离出高分子免疫复合物沉淀, 重新溶解后荧光法定量, 两种体系的OMP浓度均在400~3000 ng/mL范围内与荧光强度呈良好线性关系, 检出限分别为84.7和39.6 ng/mL. pH敏感高分子相比于温度敏感高分子具有以下优点: 可以在37 ℃的生理温度进行免疫反应, 进一步提高了免疫反应的速度和效率; 可利用高分子本身的活性基团进行Ab的固定, 固定化效率、固定Ab的免疫反应活性较之NAS偶联法得到了提高; 有更高的检测灵敏度. 因此, pH敏感高分子更适合于作为相分离免疫分析的载体.

关键词: 免疫分析, 相分离, 环境敏感高分子, 比较研究, 外膜蛋白

Comparative study of two environment-sensitive polymers in phase separation immunoassay for outer membrane protein (OMP) of Aeromonas hydrophila was carried out. The temperature-sensitive polymer poly(N-isopropylacrylamide) and the pH-sensitive polymer poly(N-isopropylacrylamide-meth- acrylic acid) were synthesized, and conjugated to the anti-OMP antibody (Ab) to form the Ab-polymer complexes with N-hydroxysuccinimidyl acrylate (NAS) and N-ethyl-N'-(3-dimethylaminopropyl)carbodiimide hydrochloride (EDCI) as coupling reagents, respectively. In each competitive immunoassay, the standard OMP and the fluorescein isothiocyanate-labeled OMP competed for binding the Ab-polymer in homogeneous format. After changing the external stimuli to separate the polymer-immune complex precipitate, it was re-dissolved and determined by fluorescence method. Under optimum conditions, the calibration graphs for OMP of both systems were linear over the concentration range of 400~3000 ng/mL, with detection limits 84.7 and 39.6 ng/mL, respectively. Compared to temperature-sensitive polymers, pH-sensitive polymers were more suitable to be used as carriers in phase separation immunoassay due to the following advantages. Firstly, the immune process could be conducted at 37 ℃ and therefore the higher reactive efficiency was gotten. Secondly, the pH-sensitive polymer itself contained active groups. The immobilization efficiency and immunological reaction activities of immobilized Ab were improved over the NAS coupling method as antibody was immobilized by the active groups. Moreover, the sensitivity of the immunoassay for OMP using pH-sensitive polymer as a carrier was higher.

Key words: immunoassay, phase separation, environment-sensitive polymer, comparative study, outer membrane protein