intracellular esterase

5(6)-CFDA (5-(6)-Carboxyfluorescein diacetate) 是具有细胞渗透性的胺反应型绿色荧光探针(λex: 492 nm; λem: 517 nm)，可用于细胞染色分析。

Calcein Red AM作为绿色荧光探针Calcein AM的红色发射衍生物，是一种细胞膜通透性非荧光乙酰甲氧酯化合物，广泛应用于细胞活力与毒性评估。经细胞内酯酶水解后产生的荧光产物滞留于活细胞，在560 nm激发波长与574 nm发射波长处呈现特征荧光峰。

5-CFDA-AM作为一种细胞渗透性的酯酶底物，用于测定酶活性和细胞膜完整性，该化合物为电子中性，其渗透细胞的能力超过CFDA且所需浓度更低。在细胞内部，5-CFDA-AM经酯酶水解生成羧基荧光素，后者带有额外负电荷，因此能更有效地在细胞内保留。

5(6)-Carboxynaphthofluorescein diacetate serves as a fluorescent substrate in esterase assays, where it is cleaved by intracellular esterases, resulting in red fluorescence for enzyme activity measurement (Ex = 590 nm; Em = 645 nm) [1].

Fluo-8,AM is one of the most commonly used fluorescent probes to detect intracellular calcium concentration.Fluo-8, which penetrates the cell membrane and enters the cell, is cut by the intracellular esterase to form fluO-8, and thus is trapped in the cel