Ultrasensitive detection alkaline phosphatase activity using 3-aminophenylboronic acid functionalized gold nanoclusters

Ultrasensitive detection alkaline phosphatase activity using 3-aminophenylboronic acid functionalized gold nanoclusters
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使用 3-氨基苯硼酸功能化金纳米簇超灵敏检测碱性磷酸酶活性

DOI:
10.1016/j.snb.2018.10.083
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发表时间:
2019-02
期刊:
Sensors and Actuators B: Chemical
影响因子:
--
通讯作者:
Su Xingguang
Su Xingguang
中科院分区:
其他
文献类型:
--
作者:
Liu Qing;Li Hongxia;Jin Rui;Li Ning;Yan Xu;Su Xingguang

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本文基于3-氨基苯基硼酸功能化金纳米团簇(APBA-Au NCs),建立了一种超灵敏检测碱性磷酸酶活性的荧光双酶传感平台。碱性磷酸酶(ALP)可以催化磷酸苯酯水解为苯酚,苯酚在酪氨酸酶(TYR)存在下被羟基化生成儿茶酚。由于儿茶酚和硼酸基团之间特殊的共价结合,在APBA-Au NCs的配体上可以形成五元环酯,导致Au NCs的荧光猝灭。因此,根据荧光信号的变化,该生物传感器可用于超灵敏检测碱性磷酸酶。在最优条件下,APBA-Au NCs的荧光强度变化与ALP浓度在0.02 ~ 2.0 U/L范围内呈良好的线性关系。检出限为0.005 U/L。将该方法应用于实际样品的酶活性监测,获得了满意的结果,说明了该生物传感器的潜在应用前景。
Herein, a fluorescent bi-enzyme sensing platform for ultrasensitive detection of alkaline phosphatase activity was developed based on 3-aminophenylboronic acid functionalized gold nanoclusters (APBA-Au NCs). Alkaline phosphatase (ALP) can catalyze hydrolysis of phenyl phosphate to phenol, which can be subsequently hydroxylated to generate catechol in the presence of tyrosinase (TYR). Due to the special covalent combination between the catechol and boric acid group, the five-membered cyclic esters can be formed on the ligands of APBA-Au NCs, leading to the fluorescence quenching of the Au NCs. Thus, according to the change of fluorescence signal, the proposed biosensor can be utilized to ultrasensitive detection ALP. Under the optimal condition, there exhibited good linear relationships between fluorescence intensity change of APBA-Au NCs and the concentration of ALP in the range of 0.02–2.0 U/L. The detection limits reached 0.005 U/L. The developed strategy was employed to monitor enzyme activity in real samples with satisfactory results obtained, illustrating the potential application of this biosensor.
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