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Updated: Jan 23, 2026

Malachite Green Assay for the Discovery of Heat-Shock Protein 90 Inhibitors
Published on: January 20, 2023
Exploiting the application of l-aptamer with excellent stability: an efficient sensing platform for malachite green
Xiaowei Luo1, Zhifeng Chen2, Hongfeng Li2
1Guangdong Provincial Key Laboratory of Construction and Detection in Tissue Engineering, Guangdong Provincial Key Laboratory of Medical Image Processing, Biomaterials Research Center, School of Biomedical Engineering, Southern Medical University, Guangzhou 510515, China. jhuangaf@connect.ust.hk and Department of Chemistry, University of Washington, Washington 98195, USA.
Abstract:
Effective monitoring of the content of malachite green (MG) in aquaculture is of great importance for food safety. Traditional methods for MG assay, such as chromatography and spectroscopy, have been criticized for expensive instrumentation and complicated pretreatments. An MG RNA aptamer (MGA) is a powerful tool for immediate and rapid detection of MG. However, RNA is easily degraded by nucleases and is unstable in the environment, making accurate and reliable detection of MG difficult. In order to address the problems, an innovative levo (l)-MGA with excellent stability is designed to perform the specific recognition function. Interestingly, the gel electrophoresis and fluorescence measurement results indicate that this unnaturally occurring l-aptamer is resistant to nuclease degradation and it can be kept intact in the standard buffer solution under room temperature for quite a long time. A label-free, simple, and efficient method has been developed for sensitive detection of MG in fish tissue, which holds promising potential in food analysis and environmental monitoring.
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