ph indicator

Phenol Red (Sulfonphthal) 是一种pH 指示染料，当出现阳性反应时，会发生由粉红色到黄色的明显颜色变化。

9-Aminoacridine 是一种具有龋齿传播特性的抗菌剂，可用作局部消毒剂。它也是一种高度荧光染料，实验用作一种诱变剂，是细胞内 pH 的指示剂。

Bromothymol Blue 是 pH 指示剂，在测定弱酸弱碱时使用，在酸性条件下为黄色，在碱性条件下为蓝色。

Neutral Red 是含氮 pH 指示剂(pKi=6.8)，是类囊体内部酸化的指示剂。它能够将溶酶体染成红色。

Bromophenol blue 是酸性酞菁染料，可用作电泳的示踪染料。它也是一种 pH 指示剂，pH 指示范围是 3 到 4.6 之间。

Acid Yellow 36 (Metanil Yellow) 是一种偶氮染料和 pH 指示剂，当 pH 值从 1.2 到 2.3 时，发生由红色到黄色的颜色转变。它是 P-450 特异性同工酶和胞浆酶的双功能诱导剂，可用于皮革、造纸和纺织工业。

Aminacrine hydrochloride is a highly fluorescent anti-infective dye. It is also used as an intracellular pH indicator.

BCECF-AM, a compound permeable to cell membranes, serves as a fluorescent indicator for monitoring intracellular pH levels.

BCECF 是一种对 pH 敏感的荧光染料，是一种细胞质 pH 值指示剂，可用于检测细胞内 pH 水平。

Phenol Red sodium salt is a water-soluble pH indicator used in the range from 6.8 (yellow) to 8.2 (red).

Acid blue is a dark bluish synthetic triphenylmethane dye. It used as a food coloring. The color of the dye is pH-dependent. The structure is also redox-sensitive, changing from a reduced yellow form to an oxidized red form in solution. It is usable as a

Methyl red，一种偶氮染料，用作pH指示剂，其在pH值4.4时表现为红色，在pH值6.0时转变为黄色。

Fluorescein O-methacrylate (Methacryloyloxy fluorescein) 是一种具有pH敏感性的荧光染料，本身为荧光单体。该化合物的激发光谱位于490nm，而其发射光谱为520nm。作为一种指示剂，Fluorescein O-methacrylate 具有极低的负电荷，并且表现出良好的生物相容性和无毒性，同时在水溶液中具有优异的分散性。

BCECF-Acetoxyemnethy ester 是一种能够穿透细胞膜的化合物，常用于作为细胞内pH值的荧光指示剂。在细胞内，该化合物通过酯酶的作用被修饰成BCECF。

Aminacrine hydrochloride monohydrate, a highly fluorescent anti-infective dye, is used as a topical antiseptic and mutagen due to its interaction with DNA. It is also used as an intracellular pH indicator.

Caged fluorescent pH indicator

3,6-diacetoxy Phthalonitrile is a fluorescent probe for monitoring intracellular pH by flow cytometry in living cells. It rapidly crosses cell membranes and is cleaved by cytosolic esterases to form the fluorescent pH indicator 2,3-dicyano-hydroquinone (DCH), which is excited at UV wavelengths. DCH can be excited at 351 nm, with pH-dependent emission in the range of 450-476 nm (pH 5.0-10.0) using a potassium-based buffer.

Quin-2 is a high-affinity fluorescent calcium indicator (Kd = 115 nM for calcium). It displays high selectivity for calcium, as it is not affected by sodium gradients, membrane potential, or intracellular pH. High affinity probes like quin-2 are ideal for monitoring low levels of calcium, as are found in resting cells. Loadings of up to 2 mM quin-2 are without serious toxic effects, so quin-2 may be used to buffer intracellular calcium transients. Excitation/emission maxima for quin-2 are 339 and 492 nm, respectively.

OG 488, a fluorescent pH indicator (acid), is widely used in biochemistry and neurosciences, offering numerous applications.

Bromocresol green是一种pH敏感的三苯甲烷染料，专用于测定蛋白质及血清中的白蛋白浓度。此生物碱性染料在pH值3.0至7.5的范围内颜色从黄绿到蓝绿变化。在酸性条件下（例如pH=4.15），Bromocresol green显黄色（λmax=435 nm，质子化形式），而在碱性环境下则转为蓝色（λmax=615 nm，去质子化形式）。因此，它被广泛用作pH指示剂，在生化分析中有着重要应用。Bromocresol green还用于测定肌酐等分子浓度及评估细胞存活率。

α-Naphtholbenzein (p-Naphtolbenzein) 是一种可作为pH指示剂使用的染料，具有pH0至8.2范围内呈现黄色、pH10时转变为青绿色的视觉过度特性，常应用于酸碱滴定。

Hydroxy naphthol blue disodium 作为一种钙离子金属指示剂和碱土金属离子比色试剂(λmax = 650 nm)，在pH值介于12至13的环境中表现出明显的颜色变化；该指示剂在钙离子存在时显淡红色，在EDTA二钠作用下则转为深蓝色。

Chlorophenol Red sodium作为pH指示剂，在特定pH值范围内通过颜色变化显示酸碱度。

4-(4-Nitrophenylazo)resorcinol 是一种紫色偶氮染料，作为 pH 指示剂，在 pH 值低于 11 时呈黄色，高于 13 时呈紫色。在微碱性或碱性环境中，如存在镁盐，它会变为深蓝色。偶氮紫也用于检测铵离子，氯化铵或氢氧化铵溶液的颜色根据偶氮紫的浓度而变化。