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. 2020 May 28;8:414. doi: 10.3389/fchem.2020.00414

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Copyright © 2020 Cao, Cao, Kubota, Sasaki, Asano, Lyu, Zhang, Zhou, Zhao, Xu, Wu, Minami and Liu.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The results of the regression analysis for quantitative analysis of citrate in mixtures of oxyanions (oxalate, citrate, and malonate). The data were obtained by using the probes 1 and 2. The detailed concentration conditions are summarized in Supplementary Material. Plots of actual vs. predicted concentrations show high accuracy of prediction for multiple concentrations of each analyte. The values of root-mean-square error (RMSE) of calibration (C) and prediction (P) prove the high quality of the model and prediction.