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Missing Data Calculation Using the Antioxidant Activity in Selected Herbs

1
Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, 11 Arany Janos, 400082 Cluj-Napoca, Romania
2
Technical University of Cluj-Napoca, Department of Physics and Chemistry, 103-105 Muncii Blvd., 400641 Cluj-Napoca, Romania
*
Authors to whom correspondence should be addressed.
Symmetry 2019, 11(6), 779; https://doi.org/10.3390/sym11060779
Received: 21 May 2019 / Accepted: 5 June 2019 / Published: 12 June 2019
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Abstract

In this paper, a model has been developed that can estimate the composition of the phenol compounds, based on censored data and the total equivalent antioxidant capacity (TEAC) measured by three different methods. A contingency of 32 plants was analyzed: total phenolic content (TPC), caffeic acid, p-coumaric acid, ferulic acid, neochlorogenic acid and TEAC. They were measured by three different methods: ABTS (2,20-azinobis-(3-ethylbenzthiazoline- 6-sulfonic acid)), DPPH (1,1-diphenyl-2-picrylhydrazyl radical) and FRAP (ferric reducing/antioxidant power). Five values of caffeic-, thirteen of p-coumaric-, seven of ferulic-, and nineteen neochlorogenic acids were missing. Due to the complexity of the compounds, data mining and computational methods are required to determine the missing data. The method developed for independent variables was used to estimate the missing data. The contingency was filled with the calculated values obtained with all alternatives. The performance of each approach is shown in the estimation and/or prediction of the phenolic composition compared to the approaches used. The results indicated a strong correlation and mutual influence between the data analyzed. View Full-Text
Keywords: modeling; antioxidant activity; phenolic compounds; censored data; Chi-square statistic; correlation analysis; herbs modeling; antioxidant activity; phenolic compounds; censored data; Chi-square statistic; correlation analysis; herbs
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Bálint, D.; Jäntschi, L. Missing Data Calculation Using the Antioxidant Activity in Selected Herbs. Symmetry 2019, 11, 779.

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