鬼笔环肽（Phalloidin）是一种来源于毒蕈类鬼笔鹅膏（Amanita phalloides）的环状七肽毒素，以高亲和力（Kd= 20 nM）选择性结合于丝状肌动蛋白F-actin，而不会与单体肌动蛋白G-actin结合，通常用来标记组织切片、细胞培养物或无细胞体系中的F-actin，从而对F-actin进行定性和定量分析。另外，鬼笔环肽衍生物也以相近的亲和力结合于大小纤维，无论是动植物来源的肌肉细胞或非肌肉细胞，按照每一个肌动蛋白亚基约与一个鬼笔环肽分子的计量比结合。且非特异性结合几乎可忽略，染色区域和非染色区域辨识度非常明显。因此，鬼笔环肽衍生物特别适合替代肌动蛋白（Actin）抗体进行相关研究。另外鬼笔环肽衍生物很小，直径约12-15Å，分子量＜2000 Daltons，未标记肌动蛋白（Actin）的许多生理特性都得以维持，比如，同肌动蛋白结合蛋白如肌球蛋白，原肌球蛋白，DNase I等仍能发生反应；鬼笔环肽标记的纤维丝仍可穿透固相肌球蛋白基质；以及甘油抽提的肌纤维标记后仍可收缩等。
鬼笔环肽（Phalloidin）的结合阻止丝状肌动蛋白（微丝）的解离，稳定微丝结构，从而破坏微丝的聚合-去聚合的动态平衡。此特性使得肌动蛋白聚合发生的临界浓度（CC）降至＜1 µg/mL，因此，可用作一种聚合促进剂。此外，鬼笔环肽还可抑制F-actin的ATP水解活性。
本品为iFluorTM 488标记的鬼笔环肽，可发出高亮度、光稳定的绿色荧光，染色反应特异性强，对比性高，具有比Actin抗体更好的染色效果，适合用作F-actin的定性和定量检测。iFluorTM 488 鬼笔环肽染色与用于细胞分析的其他荧光染色完全兼容，包括荧光蛋白、Qdot® 纳米晶体和其他iFluorTM偶联物（包含iFluorTM偶联二抗）。另外，经本品结合后的F-actin仍能维持actin自身具有的许多生物学特性。且本品的结合没有物种差异性，适用性广泛。
本品以1 mg/mL的浓度提供。
| 分子量（Molecular Weight） | ～1900 |
| 最大激发/发射波长（Ex/Em） | 493/517 nm |
| 溶解性（Solubility） | 溶于DMSO |
| 结构式（Structure） |  |
冰袋运输。收到货后-20℃避光干燥保存，1年有效。
Q：40736ES 这个染料可以染活细胞么？我看说明只写了固定染色？
A：不能。
Q：可以同时孵育靶蛋白一抗吗？
A：可以先孵育一抗二抗。再染色鬼笔环肽。
Q: 40736 300T规格有多少ul ?
A: 1ml染色10个孔。装量是30ul。
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