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Multivariate Optimization for the Development of a Fast and Simple Ultrasound-Assisted Extraction Procedure for Multielemental Determination in Tea Leaves by Inductively Coupled Plasma Optical Emission Spectrometry (ICP OES)

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Abstract

The current study describes a fast and efficient procedure of ultrasound-assisted extraction for determination of Ca, Mg, K, Na, Cu, Zn, Mn, and Al in tea leaves by inductively coupled plasma optical emission spectrometry (ICP OES). The variables of procedure were optimized using the Box–Behnken design and the conditions selected were nitric acid concentration (1.0 mol L−1), sonication time (7 min), and sonication temperature (75 °C). The extraction efficiency was calculated using the analyte concentration obtained by a total digestion procedure as reference. Accuracy was confirmed by analysis of certified reference material of apple leaves (NIST 1515) and spinach leaves (NIST 1570a) using the procedure proposed. A statistical evaluation using Student’s t test showed that there is no significant difference between the value obtained with the proposed procedure and the certified value, at 95% confidence level. The proposed procedure was successfully applied and is a good alternative to conventional acid digestion procedure and can be applied to routine analysis for determination of Ca, Mg, K, Na, Zn, Mn, Cu, and Al in tea leaves used for the preparation of infusions.

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Acknowledgements

The authors acknowledge the financial support of Fundação de Amparo à Pesquisa do Estado da Bahia (FAPESB), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq).

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Authors and Affiliations

  1. Grupo de Análise Instrumental Aplicada, Universidade Federal de São Carlos, São Carlos, São Paulo, 13565-905, Brazil

    Vinicius Câmara Costa

  2. Departamento de Ciências Exatas e Tecnológicas, Universidade Estadual de Santa Cruz, Ilhéus, Bahia, 45662-900, Brazil

    Vinicius Câmara Costa, Wesley Nascimento Guedes & Madson Moreira Nascimento

  3. Instituto de Química, Departamento de Química Analítica, Universidade Estadual Paulista, Araraquara, São Paulo, 14800-060, Brazil

    Wesley Nascimento Guedes & Antonio de Santana Santos

  4. Instituto de Química, Departamento de Química Analítica, Campus de Ondina, Universidade Federal da Bahia, Salvador, Bahia, 40170-115, Brazil

    Madson Moreira Nascimento

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  1. Vinicius Câmara Costa
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  2. Wesley Nascimento Guedes
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Correspondence to Vinicius Câmara Costa.

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Vinicius Câmara Costa declares that he has no conflict of interest. Wesley Nascimento Guedes declares that he has no conflict of interest. Antonio de Santana Santos declares that he has no conflict of interest. Madson Moreira Nascimento declares that he has no conflict of interest.

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Costa, V.C., Nascimento Guedes, W., de Santana Santos, A. et al. Multivariate Optimization for the Development of a Fast and Simple Ultrasound-Assisted Extraction Procedure for Multielemental Determination in Tea Leaves by Inductively Coupled Plasma Optical Emission Spectrometry (ICP OES). Food Anal. Methods 11, 2004–2012 (2018). https://doi.org/10.1007/s12161-018-1171-8

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