Phytochemical Characterization and Evaluation of Bioactive Properties of Tisanes Prepared from Promising Medicinal and Aromatic Plants
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foods Article Phytochemical Characterization and Evaluation of Bioactive Properties of Tisanes Prepared from Promising Medicinal and Aromatic Plants Beatriz H. Paschoalinotto 1,2 , Maria Inês Dias 1,* , José Pinela 1 ,Tânia C.S.P. Pires 1 , Maria José Alves 1, Andrei Mocan 3,4 , Ricardo C. Calhelha 1 , Lillian Barros 1,* , Rafael P. Ineu 2 and Isabel C.F.R. Ferreira 1 1 Centro de Investigação de Montanha (CIMO), Instituto Politécnico de Bragança, Campus de Santa Apolónia, 5300-253 Bragança, Portugal; [email protected] (B.H.P.); [email protected] (J.P.); [email protected] (T.C.S.P.P.); [email protected] (M.J.A.); [email protected] (R.C.C.); [email protected] (I.C.F.R.F.) 2 Universidade Tecnológica Federal do Paraná, Campus Campo Mourão (UTFPR-CM), Campo Mourão 87301-899, Brazil; [email protected] 3 Faculty of Pharmacy, “Iuliu Hat, ieganu” University of Medicine and Pharmacy, 8 Victor Babes, Street, 400012 Cluj-Napoca, Romania; [email protected] 4 Laboratory of Chromatography, Institute of Advanced Horticulture Research of Transylvania, University of Agricultural Sciences and Veterinary Medicine, 400372 Cluj-Napoca, Romania * Correspondence: [email protected] (M.I.D.); [email protected] (L.B.); Tel.: +351-273-330-903 (M.I.D.) Abstract: The chemical composition and biological properties correlation in several medicinal and aromatic plants is still underexplored, especially in its most common form of consumption as tisane. Citation: Paschoalinotto, B.H.; Dias, The present study aims to characterize the organic acids and vitamin E composition of five tisanes M.I.; Pinela, J.; Pires, T.C.S.P.; Alves, and their extracts by High-Performance Liquid Chromatography coupled to a diode-array detector M.J.; Mocan, A.; Calhelha, R.C.; (HPLC-DAD) and HPLC coupled to a fluorescence detector techniques, respectively, and the phenolic Barros, L.; Ineu, R.P.; Ferreira, I.C.F.R. composition by HPLC-DAD-ESI/MS (mass spectrometry by electrospray ionization). It also focuses Phytochemical Characterization and on their bioactive properties, namely antioxidant, antimicrobial, anti-inflammatory, cytotoxic, anti- Evaluation of Bioactive Properties of tyrosinase, and anti-diabetic activities. A Principal Component Analysis (PCA) was performed in Tisanes Prepared from Promising order to understand the correlation between the chemical composition and bioactive properties of Medicinal and Aromatic Plants. Foods the tisanes. The tisane 5 (T5) composed by lemon thyme, tutsan, cloves, and cinnamon, was the 2021, 10, 475. https://doi.org/ 10.3390/foods10020475 most promising mixture, presenting the lowest values for the lipid peroxidation inhibition, anti- inflammatory, and anti-diabetic activity. It also presented the highest concentration of phenolic Academic Editor: Rubén Domínguez acids (caffeoylquinic acids derivatives), and flavan-3-ols (catechin derivatives). Only the dry plants presented tocopherols. For the antihemolytic, antimicrobial, and cytotoxic activity, T2 and T4 (with Received: 26 January 2021 lemon thyme) were highlighted as the best herbal mixtures. The PCA proved to be a valid tool to Accepted: 19 February 2021 select the most promising tisane according to the bioactivity. These results suggest that the studied Published: 22 February 2021 tisanes can be source of high added-value bioactive compounds with health-promoting effects and potential for application in the food and nutraceutical industries, among others. Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in Keywords: medicinal and aromatic plants; herbal teas; tisane; phenolic compounds; bioactives published maps and institutional affil- iations. 1. Introduction Currently, there is a growing interest in medicinal and aromatic plants (MAPs) due to Copyright: © 2021 by the authors. the various benefits they provide to consumers’ health. MAPs, as natural sources of several Licensee MDPI, Basel, Switzerland. bioactive compounds, have medicinal properties with great potential to be applied for the This article is an open access article treatment of several diseases [1]. Their most common form of consumption is as tisane, or distributed under the terms and popularly known as herbal teas or infusions [2]. conditions of the Creative Commons The active roles of several MAPs upon disease prevention, control, or reduction have Attribution (CC BY) license (https:// been attributed to the antioxidant features of lypossoluble constituents (such as vitamins creativecommons.org/licenses/by/ 4.0/). A and E), water-soluble components (such as vitamin C and organic acids), and phenolic Foods 2021, 10, 475. https://doi.org/10.3390/foods10020475 https://www.mdpi.com/journal/foods Foods 2021, 10, 475 2 of 26 compounds [3–6]. The antioxidant activity of phenolic compounds is mainly due to their redox properties, which allow them to act as reducing agents and hydrogen donators [7]. The characterization of phenolic compounds responsible for the different beneficial prop- erties identified is of great interest for the food and nutraceutical industries, focusing on numerous applications, such as replacement of artificial antioxidants, development of food supplements, or nutraceuticals, among others [8,9]. There are several studies indicating that mixtures of MAPs are potentially more bioactive when compared to isolated plants [9,10]. However, the therapeutic properties that tisanes prepared from MAPs mixtures may exhibit are still under-explored. In this context, the present study describes the chemical composition in terms of phenolic compounds, organic acids, and tocopherols (vitamin E) of five tisanes prepared from mixtures of distinct MAPs. Furthermore, the antioxidant, antimicrobial, anti-inflammatory, cytotoxic, anti- tyrosinase, and antidiabetic activities of the five tisanes were also evaluated and correlated with the presence of the several families of phenolic compounds found. The results obtained could add value to these tisanes with the potential to be applied in different industrial sectors. 2. Materials and Methods 2.1. Samples and Tisanes Preparations Five tisane samples (Figure1) were kindly provided by the “Cantinho das Arom áticas” Company, Canidelo—Vila Nova de Gaia, Portugal, in their commercial form (dried and packed in plastic wrappers). Tisane one (T1) was composed by Cymbopogon citratus (D.C.) Stapf, Ocimum basilicum “Cinnamon”, and Gomphrena sp.; tisane two (T2) had Thymus x citriodorus (Pers.) Schreb, Thymus mastichina L., Lavandula angustifolia Mill, and Gomphrena globosa L.; tisane three (T3) was composed by Agastache foeniculum (Pursh) Kuntze, Mentha x piperita L., and Mentha spicata L.; tisane four (T4) had Rosmarinus officinalis L., Ocimum basilicum L., Thymus x citriodorus (Pers.) Schreb, Calendula officinalis L., and Mentha x piperita L.; finally, tisane five (T5) was composed by Hypericum androsaemum L., Thymus x citriodorus (Pers.) Schreb, Cinnamomum zeylanicum Blume, and Syzygium aromaticum L. The MAPs that make up the tisanes were produced following the principles of organic production (certified by ECOCERT, Leiria, Portugal) and do not contain caffeine (information provided by the company). Some of the biological activities that the studied plants exhibits are described in Table1. The dried samples were reduced to a fine homogeneous powder (~20 mesh) and stored in a cool dry place. The tisanes were prepared by adding 2 g of each dried sample to 50 mL of boiling distilled water (100 ◦C), allowing them to stand for 5 min at room temperature and then filtering them through a filter paper. The obtained tisanes were frozen and lyophilized, then stored in a dry place at room temperature and protected from light before further analysis. Foods 2021, 10, x FOR PEER REVIEW 2 of 24 A and E), water-soluble components (such as vitamin C and organic acids), and phenolic compounds [3–6]. The antioxidant activity of phenolic compounds is mainly due to their redox properties, which allow them to act as reducing agents and hydrogen donators [7]. The characterization of phenolic compounds responsible for the different beneficial prop- erties identified is of great interest for the food and nutraceutical industries, focusing on numerous applications, such as replacement of artificial antioxidants, development of food supplements, or nutraceuticals, among others [8,9]. There are several studies indicating that mixtures of MAPs are potentially more bio- active when compared to isolated plants [9,10]. However, the therapeutic properties that tisanes prepared from MAPs mixtures may exhibit are still under-explored. In this con- text, the present study describes the chemical composition in terms of phenolic com- pounds, organic acids, and tocopherols (vitamin E) of five tisanes prepared from mixtures of distinct MAPs. Furthermore, the antioxidant, antimicrobial, anti-inflammatory, cyto- toxic, anti-tyrosinase, and antidiabetic activities of the five tisanes were also evaluated and correlated with the presence of the several families of phenolic compounds found. The results obtained could add value to these tisanes with the potential to be applied in dif- ferent industrial sectors. 2. Materials and Methods 2.1. Samples and Tisanes Preparations Five tisane samples (Figure 1) were kindly provided by the “Cantinho das Aromát- icas” Company, Canidelo—Vila Nova de Gaia, Portugal, in their commercial form (dried and packed in plastic wrappers). Tisane one (T1) was composed by Cymbopogon citratus (D.C.) Stapf, Ocimum basilicum “Cinnamon”, and Gomphrena sp.; tisane two (T2)