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稳定同位素标记纸喷雾质谱能够对蛋白酶活性进行高灵敏度分析
Zhiqing Zhou1, Weiqing Wang1, Xiunan Zhai1
1College of Chemistry, Chemical Engineering and Materials Science, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Shandong Normal University, Jinan, 250014, PR China.
Talanta
|August 26, 2025
概括
研究人员开发了新的稳定同位素标记纳米探针,用于敏感检测血清中的calpain-2 (CAPN2) 蛋白酶活性. 这种方法克服了传统测试的局限性,使得疾病的确切诊断成为可能.
科学领域:
- 生物化学
- 分析化学
- 生物医学诊断
背景情况:
- 蛋白酶在癌症和神经退化等疾病中起着至关重要的作用.
- 传统的蛋白质酶检测方法与复杂的生物样本作斗争.
- 现有的稳定同位素内部标准是昂贵且难以合成的.
研究的目的:
- 开发一种新的,具有成本效益的敏感蛋白酶活动检测方法.
- 创建稳定的同位素标记纳米探针 (SIL-纳米探针) 用于直接蛋白质酶量化.
- 为了准确测量血清中的calpain-2 (CAPN2) 活性.
主要方法:
- 将CAPN2特异性结为金纳米粒子 (AuNPs).
- 通过点击化学使用新型稳定同位素试剂对纳米探针进行标记.
- 使用纸张喷雾质谱法 (PS-MS) 量化血清中的CAPN2活性.
主要成果:
- 在CAPN2活性方面达到0.3807 ng/ ml的低检测极限.
- 在血清样本中显著减少矩阵效应.
- 使用SIL-纳米探测器策略证明了CAPN2活动的直接和准确量化.
结论:
- 开发的SIL纳米探针提供了一种敏感和特定的蛋白酶活性检测方法.
- 这种方法克服了传统方法和昂贵的内部标准的局限性.
- 该策略可用于检测其他蛋白酶活动,从而提高诊断能力.
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