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Article

Flavanone Glycosides, Triterpenes, Volatile Compounds and Antimicrobial Activity of Miconia minutiflora (Bonpl.) DC. (Melastomataceae)

by
Nathália Siso Ferreira
1,
Márcia Moraes Cascaes
1,*,
Lourivaldo da Silva Santos
1,
Mozaniel Santana de Oliveira
2,
Maria das Graças Bichara Zoghbi
2,
Isabella Santos Araújo
3,
Ana Paula Trovatti Uetanabaro
3,
Eloisa Helena de Aguiar Andrade
1,2 and
Giselle Maria Skelding Pinheiro Guilhon
1
1
Programa de Pós-Graduação em Química, Universidade Federal do Pará, Avenida Augusto Corrêa 01, Belém 66075-110, PA, Brazil
2
Laboratório Adolpho Ducke, Coordenação de Botânica, Museu Paraense Emílio Goeldi, Avenida Perimetral, 1901, Belém 66077-830, PA, Brazil
3
Programa de Pós-Graduação em Biotecnologia, Universidade Estadual de Feira de Santana, Avenida Transnordestina s/n, Feira de Santana 44036-900, BA, Brazil
*
Author to whom correspondence should be addressed.
Molecules 2022, 27(6), 2005; https://doi.org/10.3390/molecules27062005
Submission received: 17 February 2022 / Revised: 15 March 2022 / Accepted: 18 March 2022 / Published: 21 March 2022
(This article belongs to the Special Issue Bioactivity Compounds in Latin American Medicinal Plants)
Browse Figure
Versions Notes

Abstract

:
Chemical composition of the essential oils and extracts and the antimicrobial activity of Miconia minutiflora were investigated. The flavanone glycosides, pinocembroside and pinocembrin-7-O-[4″,6″-HHDP]-β-D-glucose, were identified, along with other compounds that belong mainly to the triterpene class, besides the phenolics, gallic acid and methyl gallate. Sesquiterpenes and monoterpenes were the major compounds identified from the essential oils. Screening for antimicrobial activity from the methanolic extract of the leaves showed that the MIC and MMC values against the tested microorganisms ranged from 0.625 to 5 mg·mL−1 and that the extract was active against microorganisms, Staphyloccocus aureus, Escherichia coli, and Bacillus cereus.

1. Introduction

Melastomataceae comprises 166 genera and around 4500 species [1]. About 1470 species were cataloged in Latin America distributed in countries such as Brazil, Uruguay, Mexico, Argentina, Colombia, Ecuador, and Venezuela [2]. More than 1400 species within 69 genera occur in Brazil spread throughout the Amazon to the Uruguay frontier [3]. Miconia is the most representative genus of Melastomataceae, with a wide distribution in the American continent including 1057 species and representing the largest genus of woody flowering plants with a distribution restricted to tropical America [4].
Some Miconia species were widely used in folk medicine to treat diarrhea and stomachache [5]. Isolated compounds and Miconia extracts have demonstrated diverse pharmacological activities. The aqueous extract of M. latecrenata (DC.) Naudin leaves showed a high antioxidant effect and high antibacterial activity [4]. The cytotoxic and mutagenic potential of extracts from M. cabucu Hoehne, M. rubiginosa (Bonpl.), M. stenostachya DC., and M. albicans (Sw.) Steud were investigated and the results confirmed the safe use of Miconia extracts and reinforced the therapeutic properties and their protective effects on doxorubicin-induced mutagenicity [6]. The ethanolic leaf extract of M. albicans shows an anti-arthritic profile [7]. The ethanolic extract of M. willdenowii Klotzsch ex Naudin showed schistosomicidal [8], antimicrobial activities, and anti-L. amazonensis effects, as well as evidence that the most abundant constituent, the benzoquinone derivative primin, is the major bioactive metabolite [9].
Previous studies on Miconia species have revealed the presence of triterpenes [10], tannins [4], flavanone glycosides [11], benzoquinones [8], saponins, and leucoanthocyanins [12].
This work reports the chemical composition of extracts and essential oils and the antimicrobial activity of the methanolic extract from the leaves of Miconia minutiflora (Bonpl.) DC. A survey of the literature shows one study on the volatiles of M. minutiflora inflorescences, which were characterized by the presence of α-copaene and β-caryophyllene as major constituents [13]. Another study on M. minutiflora showed the anti-inflammatory and antinociceptive effects of the leaf methanol extract; in the same work, the authors tentatively identified the compounds casuarinin (4 isomers), ellagic acid, HHDP-galloylglucose (one isomer), myricetin-galloyl-deoxihexoside (one isomer), myruianthic acid (two isomers), and arjunolic acid (seven isomers) using UPLC-DAD-QTOF-MS/MS [14]. Effects of the extracts of seven Miconia species, including M. minutiflora, were evaluated on Lactuca sativa seeds and seedlings growth, the extract of M. minutiflora showed no allelopathic effects on the rootlets of the tested plant [15].

2. Results

2.1. Non-Volatiles

Chemical investigation of M. minutiflora leaves’ extract led to a mixture containing, mainly, a mixture of hydrocarbons (octacosane 16.95%, nonacosane 3.18%, triacontano 39.66%, untriacontano 5.13%, and dotriacontano 33.15%) (M1), the triterpene squalene [16] (S1), a mixture of the terpenoids β-amirin, α-amyrin, taraxerol and lupeol [17] (M2), a mixture of phytol [18], β and α-amyrin [19], and fatty acids (palmitic and linoleic acids) [20] (M3), and a mixture of the steroids, stigmasterol [21], spisnasterol [22] and sitosterol [23] (M4). Fractionation of the methanol extract from the leaves led to a mixture of the phenolics compounds, gallic acid and methyl gallate [24] (M5), and isolation of the flavanones, pinocembroside [25] (S4) and pinocembrin-7-O-[4″,6″-HHDP]-β-glucose [26] (S5).
Study of the M. minutiflora stems led to the isolation of sistoterol (S2), a mixture of triterpenes β and α-amyrin and fatty acids (M6), besides that a mixture of fatty acids (M7), besides a mixture of the steroids, stigmasterol and sitosterol (M8), and the triterpene ursolic acid [27] (S3). The structures of the major isolated compounds from the leaves’ extracts, pinocembroside (S4) and pinocembrin-7-O-[4″,6″-HHDP]-β-glucose (S5), are shown in Figure 1. Although the chemical composition of M. minutiflora found in this research is in accordance with other Miconia species, this is the first time that flavanone glycosides (pinocembroside and pinocembrin-7-O-[4″,6″-HHDP]-β-glucose) were isolated from Miconia.

2.2. Volatile Compounds

The percentage of the compounds identified in the essential oils and the sequence of their retention indices are listed in Table 1. Leaves, primary and secondary branches of M. minutiflora yield below 0.1% of essential oils, just enough to perform the chemical characterization. In total, 67 compounds were identified. The major constituents in the essential oils from the leaves were (3Z)-hexenol (9.73%), 1-octen-3-ol (8.16%), (3Z)-hexenylbutanoate (9.77%), cis-3-hexenyl isovalerate (8.65%), (3Z)-hexenyl hexanoate (10.91%), and phytol (7.34%). (9Z,12Z)-Octadecadienoic acid (48.71%) and n-hexadecanoic acid (32.65%) were the major compounds in the primary branches and in the secondary branches, the main compounds were n-hexadecanoic acid (42.75%), (9Z,12Z)-octadecadienoic acid (35.65%), and dodecanoic acid (6.36%).
Zoghbi and coworkers (2000) [13] obtained the volatile concentrate by micro-simultaneous distillation extraction from M. minutiflora inflorescences using pentane as a solvent and the main compounds identified were the sesquiterpenes α-copaene (22.82%) and β-caryophyllene (14.46%). The volatiles of the inflorescences of two other species of Miconia, also extracted by micro-simultaneous distillation extraction, shown as major compounds were (E,E)-α-farnesene (14.7%) and p-cymene (10.3%) in M. ciliata (Rich.) DC., while α-copaene (32.9%) and nonanal (18.5%) were the major constituents of M. rubiginosa (Bonpl.) DC. [13]. The main compounds identified in the essential oil of the aerial parts of M. ferruginata were the sesquiterpenes, β-caryophyllene (56.2%) and α-humulene (7.3%), the hydrocarbon, 8-heptadecene (16.8%), and the alcohol, l 1-octen-3-ol (9.5%) [28].

2.3. Antimicrobial Activity

The minimal inhibitory concentration (MIC) and minimum microbicidal concentration (MMC) of the methanol extract from M. minutiflora against the tested microorganisms ranged from 0.625 to 5 mg·mL−1, these data are shown in Table 2. The methanol extract was active against chloramphenicol resistant microorganisms, E. coli CCMB 261 (MIC = 0.625 and MMC = 1.25 mg·mL−1), S. aureus CCMB 262 (MIC = 0.625 and MMC = 1.25 mg·mL−1), S. aureus CCMB 263 (MIC = 0.625 and MMC = 1.25 mg·mL−1), S. aureus CCMB 285 (MIC = 0.625 and MMC = 1.25 mg·mL−1), B. cereus CCMB 282 (MIC = 0.625 and MMC = 1.25 mg·mL−1), and a nystatin resistant C. parapsilosis CCMB 288 (MIC = 5 and MMC = 10 mg·mL−1).
Rodrigues and coworkers (2008) tested the dichloromethane extract of M. cabucu against C. albicans and obtained an MIC value of 1.5 mg·mL−1 and the methanol extract of M. stenostachya against B. cereus showed an MIC of 3.0 mg·mL−1 [29]. The ethanol extract of M. albicans and M. rubiginosa showed antimicrobial activity using the well diffusion method [30].
Some compounds obtained from Miconia species also demonstrated antimicrobial activity such as the mixture of ursolic and oleanolic acids isolated from M. ferruginata leaves that was active against S. aureus, E. coli, Bacillus subtilis, and Pseudomonas aeruginosa [31]. The antifungal activity of the isolated compound pinocembroside (S4) was previously described using in vitro mycelial growth of Penicillium italicum, showing an MIC and minimum fungicidal concentration (MFC) of 200 and 800 mg·L−1, respectively, [32] and against Penicillium digitatum, with a half-maximal effective concentration (EC50), MIC, and MFC of 120.3, 200, and 400 mg·L−1, respectively [33]. Gallic acid [34] and methyl gallate also have shown antimicrobial activity [35], gallic acid has already been obtained from extracts from M. rubiginosa [6], while methyl gallate was obtained from the ethanolic extract from Monochaetum multiflorum (Bonpl.) (Melastomataceae) [36]. In addition, pinocembrin-7-O-[4″,6″-HHDP]-β-glucose showed antibacterial activity on E. coli, S. aureus, Enterococcus faecalis, Lactobacillus rhamnosus, and Bacillus subtilis [37].
The antimicrobial activity observed for the methanol extract of M. minutiflora can be explained by the presence of substances in the studied extracts indicating that this species is a valuable source for the discovery of new antimicrobial products.

3. Materials and Methods

3.1. Plant Material

Leaves and stems of M. minutiflora were collected in the Municipality of Belém (Estrada do Paiol, Km 5), State of Pará, Brazil in June 2010 for the study of its non-volatile compounds. A voucher specimen was identified and deposited at the Herbarium of the Museu Paraense Emílio Goeldi (Belém—Pará—Brazil) under the reference number MG-204.906. Another collection (leaves, primary and secondary branches) was taken in the same municipality at the Museu Paraense Emílio Goeldi—research campus in November 2014 for the identification of the volatile compounds; this specimen was identified at the same herbarium by comparison with the same voucher.

3.2. Extraction, Isolation, and Identification of the Non-Volatile Compounds

Leaves (2.00 Kg) and stems (2.00 Kg) of M. minutiflora were extracted by maceration with hexane (7 days × 2) and MeOH (14 days × 2) at room temperature. The filtrates were concentrated under reduced pressure to yield the hexane extracts (30.00 g of leaves extract and 7.00 g of stems extract) and the methanolic extracts (267.00 g of leaves extract and 118.00 g of stems extract). Part of the methanolic extracts (40.00 g each) was suspended in MeOH-H2O 3:1 and extracted with CH2Cl2, EtOAc, and n-BuOH yielding the leaves phases (CH2Cl2 phase: 7.00 g, EtOAc phase: 13.87 g, n-BuOH: 8.00 g) and the stems phases (CH2Cl2 phase: 3.00 g, EtOAc phase: 2.54 g, n-BuOH: 1.19 g) of the methanolic extracts.
The hexane extracts of the leaves (20.00 g) and of the stems (6.00 g), the CH2Cl2 phase of the stems (3.00 g), and the EtOAc phase of the leaves (14.03 g) were purified using column chromatography (CC) over silica gel using mixtures of hexane–EtOAc and EtOAc–MeOH with increasing polarity. When necessary, the resulting fractions were rechromatographed using similar techniques. The hexane extract of the leaves afforded M1 (1401 mg), S1 (772 mg), M2 (20 mg), M3 (21 mg), and M4 (56 mg). The hexane extract of the stems afforded M6 (44 mg), M7 (17 mg), and S2 (205 mg). The CH2Cl2 phase from stems afforded M8 (38 mg) and S3 (7 mg). Fractions of the EOAc phase of the leaves eluted with EtOAc–MeOH 50% and MeOH were reunited and fractionated by CC affording MM1 (100 mg) and MM2 (600 mg). Part of fraction MM1 (10 mg) was purified on an SPE cartridge eluted with 3 × 1 mL ACN:H2O 90:10 yielding M5 (4 mg). Fraction MM2 was submitted to fractioning by semipreparative HPLC using as eluent the system ACN:H2O 38:62 and flow of 4.7 mL.min−1 yielding S4 (18 mg) and S5 (19 mg). Spectra and spectral data (1H, 13C) of S4 and S5 are provided in the Supplementary Material along with chemical and instruments.

3.3. Extraction of the Essential Oils

Samples of leaves, primary and secondary branches (120 g) were hydrodistilled for 3 h, using a Clevenger-type apparatus with maintenance of the refrigeration water at 15 °C in accordance with the works described in the literature [38,39].

Analysis of the Essential Oils

The chemical composition of the volatile compounds of the Miconia minutiflora (Bonpl.) DC. (Melastomataceae) was analyzed using gas chromatography coupled to mass spectrometry, using a Thermo DSQ-II system equipped with a DB-5MS silica capillary column (30 m × 0.25 mm; 0.25 mm). For this analysis, the same protocols described previously by our research group were followed [40,41]. The volatile compounds present in the essential oil were identified by comparison with the literature [42,43].

3.4. Antimicrobial Analysis

The analysis of the antimicrobial potential of the methanolic extract from the leaves of M. minutiflora was realized against the microorganism C. parapsilosis CCMB 288 (resistant to anfoterycin-B), C. albicans CCMB 286, C. albicans CCMB 266, B. cereus CCMB 282, P. aeruginosa CCMB 268, Salmonella sp. CCMB 281, S. aureus CCMB 263, S. aureus CCMB 285, S. aureus CCMB 262 (resistant to streptomycin and dihydrostreptomycin), and E. coli CCMB 261 (sensitive to trimetoprime and resistant to sulphonamide).

3.4.1. Well Diffusion Test

The antimicrobial activity of the methanol extract was first evaluated using the well diffusion test as follows. A swab of the microorganism was transferred to 6 mL of a 0.45% saline solution and the resulting suspension was adjusted to 0.1 mL of a 1.5 × 108 cels·mL−1 (bacteria) and 1.5 × 105 cels·mL−1 (yeast). The cells suspension was added to 120 mL of MHA. The resulting mixture was transferred to Petri dishes (100 mm). After cooling the mixture, six equidistant wells (6 mm in diameter) received 65 μL of the methanol extract, at 200 mg·mL−1 in DMSO-water 1:1. Positive controls were chloramphenicol at 30 μg·mL−1 for bacteria and nystatin at 10 μg·mL−1 for yeast. The negative control was DMSO. Petri dishes were incubated at 37 °C for 24 h (bacteria) and at 28 °C for 48 h (yeast). The results were reported as the diameter of the zone of inhibition (in mm) (CLSI, 2003, with adaptations) [44].

3.4.2. Minimum Inhibitory Concentration (MIC) and Minimal Microbicidal Concentration (MMC)

The minimum inhibitory concentration (MIC) and minimal microbicidal concentration (MMC) of the methanol extract of the leaves of M. minutiflora were performed following the same protocols described in previous works [45,46].

4. Conclusions

This study showed that the extracts of M. minutiflora are an important source of glycosylated flavanones, which are very often identified from Miconia. This is the first time that the flavanones, pinocembroside and pinocembrin-7-O-[4″,6″-HHDP]-β-glucose, were isolated from a Miconia species. Compounds (3Z)-hexenol, 1-octen-3-ol, (3Z)-hexenylbutanoate, cis-3-hexenyl isovalerate, (3Z)-hexenyl hexanoate, and phytol were the major constituents of the essential oils from the leaves, while n-hexadecanoic acid and (9Z,12Z)-octadecadienoic acid were the major constituents from the primary branches and (9Z,12Z)-octadecadienoic acid, dodecanoic acid, tetradecanoic acid and n-hexadecanoic acid were the major constituents from the secondary branches. The antimicrobial screening showed that the leaves’ methanol extract is active against E. coli, S. aureus, and B. cereus and these activities can be in part explained by the presence of known bioactive compounds in the extracts.

Supplementary Materials

The following supporting information can be downloaded at: https://www.mdpi.com/article/10.3390/molecules27062005/s1. Chemical and instruments, spectra and spectral data (1H, 13C) of pinocembroside (S4) and pinocembrin-7-O-[4″,6″-HHDP]-β-glucose (S5), 300 MHz, DMSO-d6.

Author Contributions

Conceptualization, N.S.F., M.M.C. and G.M.S.P.G.; methodology, N.S.F., I.S.A., M.d.G.B.Z. and M.M.C.; writing—original draft preparation, N.S.F., M.M.C., M.S.d.O. and G.M.S.P.G.; writing—review and editing, G.M.S.P.G., A.P.T.U., L.d.S.S. and E.H.d.A.A.; visualization, M.S.d.O., G.M.S.P.G. and E.H.d.A.A.; supervision, G.M.S.P.G.; project administration, G.M.S.P.G. All authors have read and agreed to the published version of the manuscript.

Funding

This research received no external funding.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

Not applicable.

Acknowledgments

The author M.M.C. thanks CAPES for the Ph.D. scholarship process number: [88887.497476/2020-00]. The author M.S.d.O., thanks PCI-MCTIC/MPEG, as well as CNPq for the scholarship process number: [301194/2021-1]. The authors would like to thank the Universidade Federal do Pará/PROPESP Edital 02/2022, Programa de Apoio à Publicação Qualificada.

Conflicts of Interest

The authors declare no conflict of interest.

Sample Availability

Not applicable.

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Molecules 27 02005 g001 550
Figure 1. Chemical structure of isolated compounds, S4 and S5.
Figure 1. Chemical structure of isolated compounds, S4 and S5.
Molecules 27 02005 g001
Table
Table 1. Constituents (%) identified in the essential oils of the leaf, primary and secondary branches of Miconia minutiflora.
Table 1. Constituents (%) identified in the essential oils of the leaf, primary and secondary branches of Miconia minutiflora.
RILRICConstituentsLeafBranch-1Branch-2
801799Hexanal0.550.030.14
846846(2E)-Hexenal0.380.04
850851(3Z)-Hexenol9.730.030.1
854857(2E)-Hexenol0.77
863864Hexanol1.39 0.1
907908(2E,4E)-Hexadienal0.52
947914(2E)-Heptenal0.15
952953Benzaldehyde0.330.020.05
959960Heptanol0.25
9749741-Octen-3-ol8.160.15
9819816-methyl-5-Hepten-2-one0.27
9849853-p-Menthene0.29
9899906-methyl-5-Hepten-2-ol0.28 0.05
10051005(2E,4E)-Heptadienal0.32
10041008(3Z)-Hexenylacetate0.54
10241026Limonene0.250.050.07
10361038Benzeneacetaldehyde0.07 0.09
10441044(E)-β-Ocimene0.35
10631063n-Octanol0.23
10861086Terpinolene0.14
10891090p-Cymenene0.28
10951096Linalool1.19
11001100Nonanal0.250.10.15
11021115(2E,4E)-Octadienal0.07
11421142(3Z)-Hexenylisobutanoate0.75
11521152(3Z)-Nonen-1-ol0.44
11571157(2E)-Nonen-1-al0.150.110.12
11841183(3Z)-Hexenylbutanoate9.77
11911186Hexylbutanoate0.370.05
11861188α-Terpineol0.720.13
11961196Safranal0.17
12011202Decanal 0.13
12101210(2E,4E)-Nonadienal 0.05
12321226cis-3-Hexenyl isovalerate8.65
12491248Geraniol0.13
12601260(2E)-Decenal0.25 0.05
12791275cis-3-hexenyl valerate0.26
12851286Safrole0.18 0.09
129312942-Undecanone0.28
13151315(2E,4E)-Decadienal0.270.08
13301330Hexyl tiglate0.26
13641365Decanoic acid 0.11
13741374α-Copaene0.97
13831382(E)-β-Damascenone0.57
13781385(3Z)-Hexenyl hexanoate10.91
14171417(E)-Caryophyllene2.66
14281428(E)-α-Ionone0.78
14321432trans-α-Bergamotene0.19
14531453Geranyl acetone0.72 0.05
14521454α-Humulene0.98
14871488(E)-β-Ionone1.89 0.05
149514952-Tridecanone0.34
15051505(E,E)-α-Farnesene0.36
15141515β-Curcumene1.28
15611562E-Nerolidol0.69
15651566Dodecanoic acid0.912.36.36
15651568(3Z)-Hexenyl benzoate1.93
15941595Ethyl dodecanoate0.31
17221725Tetradecanoic acid0.592.64.48
19461940Isophytol0.340.29
19421941Phytol7.34 1.41
19591959n-Hexadecanoic acid1.8332.6542.75
20292117(9Z,12Z)-Octadecadienoic acid 48.7135.65
21242130Octadecanoic acid 0.11.48
25002501Pentacosane0.2 0.44
26002603Hexacosane0.120.720.2
27002705Heptacosane0.120.380.09
Total85.4488.5494.26
RIC = Calculated retention index; RIL = Literature retention index; Branch-1: primary branches; Branch-2: secondary branches.
Table
Table 2. Antimicrobial potential of the methanol extract of Miconia minutiflora leaves.
Table 2. Antimicrobial potential of the methanol extract of Miconia minutiflora leaves.
MicroorganismMIC (mg·mL−1)MMC (mg·mL−1)Control
Nist/Chlorf DMSO
(mg·mL−1)
Escherichia coli CCMB 2610.6251.25R5.00
Pseudomonas aeruginosa CCMB 2681.252.50.315.00
Salmonella sp. CCMB 2811.252.50.165.00
Staphylococcus aureus CCMB 2620.6251.250.315.00
S. aureus CCMB 2630.6251.250.3110.00
S. aureus CCMB 2850.6251.25R10.00
Bacillus cereus CCMB 2820.6251.250.165.00
Candida albicans CCMB 2862.550.6310.00
C. albicans CCMB 2662.550.0810.00
C. parapsilosis CCMB 288510R10.00
R: resistant, Nyst: nystatin, Chlorf: chloramphenicol.
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Ferreira, N.S.; Cascaes, M.M.; da Silva Santos, L.; de Oliveira, M.S.; das Graças Bichara Zoghbi, M.; Araújo, I.S.; Uetanabaro, A.P.T.; de Aguiar Andrade, E.H.; Guilhon, G.M.S.P. Flavanone Glycosides, Triterpenes, Volatile Compounds and Antimicrobial Activity of Miconia minutiflora (Bonpl.) DC. (Melastomataceae). Molecules 2022, 27, 2005. https://doi.org/10.3390/molecules27062005

AMA Style

Ferreira NS, Cascaes MM, da Silva Santos L, de Oliveira MS, das Graças Bichara Zoghbi M, Araújo IS, Uetanabaro APT, de Aguiar Andrade EH, Guilhon GMSP. Flavanone Glycosides, Triterpenes, Volatile Compounds and Antimicrobial Activity of Miconia minutiflora (Bonpl.) DC. (Melastomataceae). Molecules. 2022; 27(6):2005. https://doi.org/10.3390/molecules27062005

Chicago/Turabian Style

Ferreira, Nathália Siso, Márcia Moraes Cascaes, Lourivaldo da Silva Santos, Mozaniel Santana de Oliveira, Maria das Graças Bichara Zoghbi, Isabella Santos Araújo, Ana Paula Trovatti Uetanabaro, Eloisa Helena de Aguiar Andrade, and Giselle Maria Skelding Pinheiro Guilhon. 2022. "Flavanone Glycosides, Triterpenes, Volatile Compounds and Antimicrobial Activity of Miconia minutiflora (Bonpl.) DC. (Melastomataceae)" Molecules 27, no. 6: 2005. https://doi.org/10.3390/molecules27062005

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