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Seco A, Pereira AR, Camuenho A, Oliveira J, Dias R, Brás N, Basílio N, Parola AJ, Lima JC, de Freitas V, Pina F. Comparing the Chemistry of Malvidin-3- O-glucoside and Malvidin-3,5- O-diglucoside Networks: A Holistic Approach to the Acidic and Basic Paradigms with Implications in Biological Studies. J Agric Food Chem 2024; 72:7497-7510. [PMID: 38520401 PMCID: PMC10995998 DOI: 10.1021/acs.jafc.4c00552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Revised: 03/07/2024] [Accepted: 03/11/2024] [Indexed: 03/25/2024]
Abstract
The kinetics, thermodynamics, and degradation of malvidin mono- and diglucosides were studied following a holistic approach by extending to the basic medium. In acidic conditions, the reversible kinetics of the flavylium cation toward the equilibrium is controlled by the hydration and cis-trans isomerization steps, while in the basic medium, the OH- nucleophilic addition to the anionic quinoidal bases is the slowest step. There is a pH range (transition pHs), between the acidic and basic paradigms, that includes physiological pH (7.4), where degradation reactions occur faster, preventing the system from reaching the equilibrium. The transition pH of the diglucoside is narrower, and in contrast with the monoglucoside, there is no evidence for the formation of colored oligomers among the degradation products. Noteworthy, OH- addition in position 4 to form B42-, a kinetic product that decreases the overall equilibration rate, was observed only for the diglucoside.
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Affiliation(s)
- André Seco
- LAQV—REQUIMTE,
Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - Ana Rita Pereira
- LAQV—REQUIMTE,
Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal
| | - Ambrósio Camuenho
- LAQV—REQUIMTE,
Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - Joana Oliveira
- LAQV—REQUIMTE,
Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal
| | - Ricardo Dias
- LAQV—REQUIMTE,
Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal
| | - Natércia
F. Brás
- LAQV—REQUIMTE,
Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal
| | - Nuno Basílio
- LAQV—REQUIMTE,
Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - A. Jorge Parola
- LAQV—REQUIMTE,
Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - João C. Lima
- LAQV—REQUIMTE,
Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - Victor de Freitas
- LAQV—REQUIMTE,
Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal
| | - Fernando Pina
- LAQV—REQUIMTE,
Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
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Camuenho A, Seco A, Parola AJ, Basílio N, Pina F. Intermolecular Copigmentation of Malvidin-3- O-glucoside with Caffeine in Water: The Effect of the Copigment on the pH-Dependent Reversible and Irreversible Processes. ACS Omega 2022; 7:25502-25509. [PMID: 35910157 PMCID: PMC9330165 DOI: 10.1021/acsomega.2c02571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Intermolecular copigmentation of malvidin-3-O-glucoside with caffeine was studied using a holistic procedure that includes the extension to basic pH values. In moderately basic solutions (7.5 < pH < 9.5) and independently of the copigment presence, there is a pH region where degradation of the quinoidal base and anionic quinoidal bases is faster than hydration and OH- nucleophilic addition, preventing the system from reaching the equilibrium. Intermolecular copigmentation with caffeine reduces significantly the degradation rate of quinoidal bases. In a more basic medium, the equilibrium is reached and degradation occurs from the anionic chalcones. In this case, the addition of caffeine also reduces the degradation rate in the interval 10 < pH < 11.5.
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Gao B, Chang Q, Xi Z, El-Sayed MMH, Shoeib T, Yang H. Fabrication of environmentally-friendly composited sponges for efficient removal of fluoroquinolones antibiotics from water. J Hazard Mater 2022; 426:127796. [PMID: 34802821 DOI: 10.1016/j.jhazmat.2021.127796] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 10/26/2021] [Accepted: 11/11/2021] [Indexed: 06/13/2023]
Abstract
In this study, two environmentally-friendly macroscopically formal (PVF) composited sponges (PL and PLS) functionalized with lignin and lignosulfonate, respectively, were fabricated by a one-step mechanical foaming method. PLS, obtained with the fed mass ratio of 0.3:1 lignosulfonate to PVF in the preparation process, possessed a large specific surface area of approximately 22.396 m2/g, a three-dimensional skeleton structure with a skeletal density of 3.236 g/cm3, and 0.338 mmol/g of acidic oxygen-containing groups. Thus, it showed a high adsorption capacity of 0.16-0.24 mmol/g in removing seven antibiotics, of the popular fluoroquinolones (FQs) family from water. The contributions of hydrogen bonding, electrostatic attraction (EA) and π-π electron donor-acceptor interaction to the adsorption of FQs onto the PL and PLS sponges were analyzed systematically by investigating the pH dependence of the adsorption capacity, and the changes in adsorption of two sub structural analogs of FQs as molecular probes, and by performing theoretical calculations. The EA between the acidic oxygen-containing groups on the sponges and the amino groups of FQs played a dominant role in adsorption in near neutral conditions, leading to a superior adsorption performance for PLS. Overall, the composited sponges have the advantages of simple production, environmental-friendliness, convenient recycle, and low cost, which renders them potentially viable in treating real wastewater containing FQs.
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Affiliation(s)
- Boqiang Gao
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
| | - Qianqian Chang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
| | - Zhonghua Xi
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
| | - Mayyada M H El-Sayed
- Department of Chemistry, The American University in Cairo, New Cairo 11835, Egypt
| | - Tamer Shoeib
- Department of Chemistry, The American University in Cairo, New Cairo 11835, Egypt
| | - Hu Yang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China; Quanzhou Institute for Environmental Protection Industry, Nanjing University, Beifeng Road, Quanzhou 362000, PR China.
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Abstract
Flavylium compounds are a well-known family of pigments because they are prevalent in the plant kingdom, contributing to colors over a wide range from shades of yellow-red to blue in fruits, flowers, leaves, and other plant parts. Flavylium compounds include a large variety of natural compound classes, namely, anthocyanins, 3-deoxyanthocyanidins, auronidins, and their respective aglycones as well as anthocyanin-derived pigments (e.g., pyranoanthocyanins, anthocyanin-flavan-3-ol dimers). During the past few decades, there has been increasing interest among chemists in synthesizing different flavylium compounds that mimic natural structures but with different substitution patterns that present a variety of spectroscopic characteristics in view of their applications in different industrial fields. This Review provides an overview of the chemistry of flavylium-based compounds, in particular, the synthetic and enzymatic approaches and mechanisms reported in the literature for obtaining different classes of pigments, their physical-chemical properties in relation to their pH-dependent equilibria network, and their chemical and enzymatic degradation. The development of flavylium-based systems is also described throughout this Review for emergent applications to explore some of the physical-chemical properties of the multistate of species generated by these compounds.
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Affiliation(s)
- Luis Cruz
- LAQV-REQUIMTE, Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, Rua do Campo Alegre, s/n, 4169-007 Porto, Portugal
| | - Nuno Basílio
- LAQV-REQUIMTE, Department of Chemistry, Faculty of Sciences and Technology, New University of Lisbon, 2829-516 Caparica, Portugal
| | - Nuno Mateus
- LAQV-REQUIMTE, Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, Rua do Campo Alegre, s/n, 4169-007 Porto, Portugal
| | - Victor de Freitas
- LAQV-REQUIMTE, Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, Rua do Campo Alegre, s/n, 4169-007 Porto, Portugal
| | - Fernando Pina
- LAQV-REQUIMTE, Department of Chemistry, Faculty of Sciences and Technology, New University of Lisbon, 2829-516 Caparica, Portugal
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Mendoza J, Cruz L, de Freitas V, Pina F, Basílio N. Anthocyanin Color Stabilization by Host-Guest Complexation with p-Sulfonatocalix[n]arenes. Molecules 2021; 26:molecules26175389. [PMID: 34500822 PMCID: PMC8434021 DOI: 10.3390/molecules26175389] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 08/16/2021] [Accepted: 08/31/2021] [Indexed: 11/16/2022] Open
Abstract
Flavylium-based compounds in their acidic and cationic form bring color to aqueous solutions, while under slightly acidic or neutral conditions they commonly bring discoloration. Selective host-guest complexation between water-soluble p-sulfonatocalix[n]arenes (SCn) macrocycles and the flavylium cationic species can increase the stability of the colored form, expanding its domain over the pH scale. The association constants between SCn and the cationic (acid) and neutral basic forms of flavylium-based compounds were determined through UV-Vis host-guest titrations at different pH values. The affinity of the hosts for synthetic chromophore was found to be higher than for a natural anthocyanin (Oenin). The higher affinity of SC4 for the synthetic flavylium was confirmed by 1H NMR showing a preferential interaction of the flavylium phenyl ring with the host cavity. In contrast with its synthetic counterpart, the flavylium substitution pattern in the anthocyanin seems to limit the inclusion of the guest in the host’s binding pocket. In this case, the higher affinity was observed for the octamer (SC8) likely due to its larger cavity and higher number of negatively charged sulfonate groups.
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Affiliation(s)
- Johan Mendoza
- LAQV—REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal;
- Correspondence: (J.M.); (N.B.)
| | - Luis Cruz
- LAQV—REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal; (L.C.); (V.d.F.)
| | - Victor de Freitas
- LAQV—REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal; (L.C.); (V.d.F.)
| | - Fernando Pina
- LAQV—REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal;
| | - Nuno Basílio
- LAQV—REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal;
- Correspondence: (J.M.); (N.B.)
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Pina F, Alejo-Armijo A, Clemente A, Mendoza J, Seco A, Basílio N, Parola AJ. Evolution of Flavylium-Based Color Systems in Plants: What Physical Chemistry Can Tell Us. Int J Mol Sci 2021; 22:3833. [PMID: 33917158 PMCID: PMC8067881 DOI: 10.3390/ijms22083833] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 03/31/2021] [Accepted: 04/02/2021] [Indexed: 12/03/2022] Open
Abstract
Anthocyanins are the basis of the color of angiosperms, 3-deoxyanthocyanins and sphagnorubin play the same role in mosses and ferns, and auronidins are responsible for the color in liverworts. In this study, the color system of cyanidin-3-O-glucoside (kuromanin) as a representative compound of simpler anthocyanins was fully characterized by stopped flow. This type of anthocyanin cannot confer significant color to plants without intra- or intermolecular interactions, complexation with metals or supramolecular structures as in Commelina communis. The anthocyanin's color system was compared with those of 3-deoxyanthocyanins and riccionidin A, the aglycone of auronidins. The three systems follow the same sequence of chemical reactions, but the respective thermodynamics and kinetics are dramatically different.
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Affiliation(s)
- Fernando Pina
- LAQV—REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal; (A.A.-A.); (J.M.); (A.S.); (N.B.); (A.J.P.)
| | - Alfonso Alejo-Armijo
- LAQV—REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal; (A.A.-A.); (J.M.); (A.S.); (N.B.); (A.J.P.)
| | - Adelaide Clemente
- cE3c—Centre for Ecology, Evolution and Environmental Changes, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal;
| | - Johan Mendoza
- LAQV—REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal; (A.A.-A.); (J.M.); (A.S.); (N.B.); (A.J.P.)
| | - André Seco
- LAQV—REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal; (A.A.-A.); (J.M.); (A.S.); (N.B.); (A.J.P.)
| | - Nuno Basílio
- LAQV—REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal; (A.A.-A.); (J.M.); (A.S.); (N.B.); (A.J.P.)
| | - António Jorge Parola
- LAQV—REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal; (A.A.-A.); (J.M.); (A.S.); (N.B.); (A.J.P.)
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Cruz L, Correa J, Mateus N, de Freitas V, Tawara MH, Fernandez-Megia E. Dendrimers as Color-Stabilizers of Pyranoanthocyanins: The Dye Concentration Governs the Host-Guest Interaction Mechanisms. ACS Appl Polym Mater 2021; 3:1457-1464. [PMID: 34632408 PMCID: PMC8496130 DOI: 10.1021/acsapm.0c01321] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Accepted: 02/20/2021] [Indexed: 06/13/2023]
Abstract
Anionic dendrimers have recently emerged as hosts (H) for the color stabilization of the flavylium cation of anthocyanin guests (G). The interaction with a promising, more hydrophobic pyranoanthocyanin illustrates how the structure and concentration of the dye modulate the host-guest interaction mechanisms. NMR and UV-vis titrations (host over guest, from G/H ratio 2089 to 45) showed that at relatively low dendrimer-to-dye concentrations, ion pairs at the dendrimer periphery prevail over dye encapsulation. This promotes the deaggregation of the dye, not previously observed with anthocyanins, and related to the more hydrophobic nature of this dye (deshielding of the dye 1H signals, higher T 2 relaxation times, constant diffusion coefficient). As the dendrimer concentration increases, the dye encapsulation, earlier unseen with structurally simpler flavylium dyes, becomes dominant (shielding and broadening of the dye 1H signals and lower T 2 and diffusion coefficient). The interaction parameters of the encapsulation process (K ∼ 4.51 × 104 M-1, n ∼ 150) indicate the binding of ca. one pyranoanthocyanin molecule by each sulfate terminal group. Our results provide insights into the ability of dendrimers to host structurally diverse pyranoflavylium-based dyes and how the structure of the latter modulates the range of interactions involved. The encapsulation ability of this dendrimer to such pH-sensitive dyes is envisioned for the host-guest sensing applications such as pH-responsive systems used for example in food smart packaging.
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Affiliation(s)
- Luís Cruz
- REQUIMTE/LAQV,
Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, s/n, 4169-007 Porto, Portugal
| | - Juan Correa
- Centro
Singular de Investigación en Química Biolóxica
e Materiais Moleculares (CIQUS) and Departamento de Química
Orgánica, Universidade de Santiago
de Compostela, Jenaro de la Fuente s/n, 15782 Santiago de Compostela, Spain
| | - Nuno Mateus
- REQUIMTE/LAQV,
Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, s/n, 4169-007 Porto, Portugal
| | - Victor de Freitas
- REQUIMTE/LAQV,
Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, s/n, 4169-007 Porto, Portugal
| | - Maun H. Tawara
- Centro
Singular de Investigación en Química Biolóxica
e Materiais Moleculares (CIQUS) and Departamento de Química
Orgánica, Universidade de Santiago
de Compostela, Jenaro de la Fuente s/n, 15782 Santiago de Compostela, Spain
| | - Eduardo Fernandez-Megia
- Centro
Singular de Investigación en Química Biolóxica
e Materiais Moleculares (CIQUS) and Departamento de Química
Orgánica, Universidade de Santiago
de Compostela, Jenaro de la Fuente s/n, 15782 Santiago de Compostela, Spain
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Hamid HA, Mutazah R, Yahya IH, Zeyohannes SS. Starch Based Film Incorporated with <i>Clitoria ternatea</i> Flower Extracts as pH Indicator. MSF 2021; 1025:252-256. [DOI: 10.4028/www.scientific.net/msf.1025.252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
The present study demonstrated the evaluation of starch based film formulated with ClitoriaTernatea flowers extracts which act as pH indicator. Maceration, sonication and infusion extraction were employed to determine the percentage yield of the flower extracts. Extract solutions (1mg/mL) were subjected to UPLC-QTOF/MS in order to detect and identify the chemical constituents of C. ternatea. UV-Vis analysis is done by treating the extracts (4mg/mL) with prepared buffer solution in various pH value ranged (2.0 – 11.0) and the absorbance were observed within a broad range of wavelength (400-700 nm). 100 mL solution of 4g starch, C. ternatea extracts and glycerol (19g plasticizer/100g starch) in distilled water were undergo gelatinization process to form the desired thin film. The functional group presented in the film and raw materials were detected and defined by analyzing through FTIR spectroscopy. From the results, maceration techniques produced the higher yield of extracts with 41.48% compared to sonication and infusion method. Variation colours of C. ternatea solution were displayed in different value of pH. At pH lower than 3, the extract solution illustrated light red to purple in colour while at higher pH value to the more basic pH (4,5,6,7,8 and 9), the colour can be perceived as blue. From the gelatinization process, the blue smooth thin layer of film was produced. FTIR analysis showed that all of samples contain C-O bond (3300 cm-1). Starch based film formulated with C. ternatea as pH indicator can be applied to detect the spoilage of foods in the production of food wrapper and packaging.
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Cruz L, Basílio N, Mendoza J, Mateus N, de Freitas V, Tawara MH, Correa J, Fernandez‐Megia E. Impact of a Water‐Soluble Gallic Acid‐Based Dendrimer on the Color‐Stabilizing Mechanisms of Anthocyanins. Chemistry 2019; 25:11696-11706. [DOI: 10.1002/chem.201901912] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Indexed: 11/09/2022]
Affiliation(s)
- Luís Cruz
- REQUIMTE/LAQV Departamento de Química e, Bioquímica, Faculdade de Ciências Universidade do Porto Rua do Campo Alegre, s/n 4169-007 Porto Portugal
| | - Nuno Basílio
- LAQV, REQUIMTE Departamento de Química Faculdade de Ciências e Tecnologia Universidade, Nova de Lisboa 2829-516 Caparica Portugal
| | - Johan Mendoza
- LAQV, REQUIMTE Departamento de Química Faculdade de Ciências e Tecnologia Universidade, Nova de Lisboa 2829-516 Caparica Portugal
| | - Nuno Mateus
- REQUIMTE/LAQV Departamento de Química e, Bioquímica, Faculdade de Ciências Universidade do Porto Rua do Campo Alegre, s/n 4169-007 Porto Portugal
| | - Victor de Freitas
- REQUIMTE/LAQV Departamento de Química e, Bioquímica, Faculdade de Ciências Universidade do Porto Rua do Campo Alegre, s/n 4169-007 Porto Portugal
| | - Maun H. Tawara
- Centro Singular de Investigación en Química Biolóxica e, Materiais Moleculares, (CIQUS) and Departamento de Química Orgánica Universidade de Santiago de Compostela Jenaro de la Fuente s/n 15782 Santiago de Compostela Spain
| | - Juan Correa
- Centro Singular de Investigación en Química Biolóxica e, Materiais Moleculares, (CIQUS) and Departamento de Química Orgánica Universidade de Santiago de Compostela Jenaro de la Fuente s/n 15782 Santiago de Compostela Spain
| | - Eduardo Fernandez‐Megia
- Centro Singular de Investigación en Química Biolóxica e, Materiais Moleculares, (CIQUS) and Departamento de Química Orgánica Universidade de Santiago de Compostela Jenaro de la Fuente s/n 15782 Santiago de Compostela Spain
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