Bioluminescent Ratiometric Indicator for Analysis of Water Hardness in Household Water
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ID: 113834
2020
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Abstract
Water hardness (WH) is a useful parameter for testing household water, such as drinking, cooking, and washing water. Many countries around the world use pipeline water in their houses, but there is a need to monitor the WH because hard water has a negative impact on appliances. Currently, WH is often measured using chemical dye-based WH indicators, and these techniques require expensive equipment, and trained personnel. Therefore, a low-cost and simple measurement method has been desired. Here, we report LOTUS-W, which consists of a luciferase, Nanoluc, a yellow fluorescent protein Venus, and a Ca2+/Mg2+ detection domain of human centrin 3. The binding of Ca2+/Mg2+ to this indicator changes the conformation of human centrin 3, and induces bioluminescence resonance energy transfer (BRET) from Nanoluc to Venus, which changes its emission spectrum about 140%. The dissociation constants of LOTUS-W for Ca2+/Mg2+ are approximately several mM, making it suitable for measuring WH in the household water. With this indicator in combination with a smartphone, we have demonstrated that it is possible to evaluate WH easily and quickly. This novel indicator has the potential to be used for measuring not only household water but also water used in the food industry, etc.
| Reference Key |
hossain2020sensorsbioluminescent
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| Authors | Md Nadim Hossain;Ryuichi Ishida;Mitsuru Hattori;Tomoki Matsuda;Takeharu Nagai;Hossain, Md Nadim;Ishida, Ryuichi;Hattori, Mitsuru;Matsuda, Tomoki;Nagai, Takeharu; |
| Journal | sensors |
| Year | 2020 |
| DOI |
10.3390/s20113164
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| URL | |
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