Evidence-Based Complementary and Alternative Medicine

Evidence-Based Complementary and Alternative Medicine / 2013 / Article
Special Issue

Propolis: Properties, Application, and Its Potential

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Research Article | Open Access

Volume 2013 |Article ID 267878 | https://doi.org/10.1155/2013/267878

A. A. Righi, G. Negri, A. Salatino, "Comparative Chemistry of Propolis from Eight Brazilian Localities", Evidence-Based Complementary and Alternative Medicine, vol. 2013, Article ID 267878, 14 pages, 2013. https://doi.org/10.1155/2013/267878

Comparative Chemistry of Propolis from Eight Brazilian Localities

Academic Editor: Vassya Bankova
Received11 Jan 2013
Revised18 Mar 2013
Accepted19 Mar 2013
Published15 Apr 2013


Propolis is a complex honeybee product with resinous aspect, containing plant exudates and beeswax. Their color, texture, and chemical composition vary, depending on the location of the hives and local flora. The most studied Brazilian propolis is the green (alecrim-do-campo) type, which contains mainly prenylated phenylpropanoids and caffeoylquinic acids. Other types of propolis are produced in Brazil, some with red color, others brown, grey, or black. The aim of the present work was to determine the chemical profiles of alcohol and chloroform extracts of eight samples of propolis, corresponding to six Brazilian regions. Methanol and chloroform extracts were obtained and analyzed by HPLC/DAD/ESI/MS and GC/MS. Two chemical profiles were recognized among the samples analyzed: (1) black Brazilian propolis, characterized chiefly by flavanones and glycosyl flavones, stemming from Picos (Piauí state) and Pirenópolis (Goiás state); (2) green Brazilian propolis, characterized by prenylated phenylpropanoids and caffeoylquinic acids, stemming from Cabo Verde (Bahia state), Lavras and Mira Bela (Minas Gerais state), Pariquera-Açu and Bauru (São Paulo state), and Ponta Grossa (Paraná state). The present work represents the first report of prenylated flavonoids in Brazilian propolis and schaftoside (apigenin-8-C-glucosyl-6-C-arabinose) in green propolis.

1. Introduction

Propolis is a resinous hive product containing bee secretions and plant resins. The wide diversity of plant species used by bees as resin sources for propolis production determines its chemical diversity. More than 300 constituents have already been identified [1], among which phenolic compounds such as flavonoids, phenolic acids, and phenolic acid esters have been reported as major constituents of propolis from the temperate zone [2].

The use of propolis with medicinal purpose dates back to 300 BC [3] and has been extensively used in folk medicine in the east and the west for centuries. It has been established that propolis possesses a wide spectrum of biological activities, such as antibacterial [4, 5], anti-inflammatory [6, 7], antioxidant [8, 9], hepatoprotective [10], and antitumoral [11]. The medicinal properties of propolis are due to a large variety of substances of plant origin, acting alone and/or synergistically. The high medicinal value of many propolis constituents stimulates chemical studies also of the corresponding plant sources [12].

The classes of propolis constituents include fatty and phenolic acids and esters, substituted phenolic esters [13], flavonoids (flavones, flavanones, flavonols, dihydroflavonols, chalcones) [1416], mono-, sesqui-, di-, and triterpenes, steroids, aromatic aldehydes and alcohols, and naphthalene and stilbene derivatives [17, 18]. Propolis from temperate regions (poplar derived) contains mostly flavonoids, aromatic acids, and their esters [19]. Mediterranean propolis from Croatia, Algeria, Greece, and Cyprus has a poplar-type chemical profile, while samples from South Greece and Crete are rich in diterpenes [20]. Propolis from Taiwan and Okinawa contains prenylated flavanones as major constituents [21, 22], while propolis from Australia is rich in prenylated stilbenes [18]. Propolis from tropical regions contains a diversity of phenolics: prenylated cinnamic acid derivatives, flavonoids, polyprenylated benzophenones and lignans, and other classes of constituents [23].

Among tropical countries, Brazil has the widest chemical diversity of propolis types. Brazilian green propolis is the most abundantly produced and consumed, either internally or externally. It contains mostly phenylpropanoids, prenylated phenylpropanoids (e.g., artepillin C), and sesqui- and diterpenoids and is produced with material obtained from apices of Baccharis dracunculifolia (Asteraceae) [24]. Chalcones, pterocarpans, and other isoflavonoids are the main constituents of Brazilian red propolis, which depends on Dalbergia ecastaphyllum (Leguminosae, Faboideae) as the main resin source [25, 26]. Propolis produced in the Brazilian Amazon may contain predominantly polyprenylated benzophenones, probably derived from Clusia spp. [27]. While it seems certain that a specific species plays the role as the main resin provider, probably bees often use several plant sources for propolis production [28]. For example, Brazilian red propolis may contain isoflavonoids (from Dalbergia) and polyprenylated benzophenones (probably from Clusia) [25].

Notable differences are often found between propolis samples, not only from distant but also from nearby locations, and sometimes in the same locality. This holds either for European [29, 30] or green propolis [3133], even restricting the analysis to samples of ‘‘typical’’ green propolis [34]. Among samples of green propolis there seems to be a gradual variation in the proportion of mevalonate-derived substances (terpenoids, including sesqui- and triterpenoids) and the typical shikimate-derived (phenolics, prenylated or not) compounds [34]. For example in the distributional area of Brazilian green propolis (Southeast Brazil) there are samples from different localities, some with deep green color, others dark, and others black; often, the green samples contain high level of phenolic compounds, while the dark and black ones contain mostly triterpenoids (unpublished observations).

Powerful chromatographic tools, such as HPLC-DAD-ESI-MSn and GC/MS, are essential for the analysis of products comprising of complex mixtures, enabling the identification and quantification of their biologically active constituents [35]. The aim of this work was to characterize the chemical profile of samples from distant Brazilian localities, with the expectation to establish chemical affinities among the analyzed samples and detect constituents not commonly reported for Brazilian propolis.

2. Material and Methods

2.1. Propolis Sampling and Processing

Samples of propolis produced by Apis mellifera were obtained from eight Brazilian localities: Picos (state of Piauí, North Central Brazil) (black propolis), Cabo Verde (Bahia state, northeast) (green propolis), Pirenópolis (Goiás state, Central Brazil) (black propolis), Lavras and Mira Bela (Minas Gerais state, Southeast) (green propolis), Pariquera-Açu and Bauru (São Paulo state, southeast) (green propolis), and Ponta Grossa (Paraná state, south) (green propolis) (Figure 1). The samples were grounded with a mortar and pestle to a fine powder. Extracts were successively prepared in Soxhlet for 3 h with 5 g of each propolis sample, first with chloroform and then with methanol. Each extract was concentrated under reduced pressure and the residue evaporated on a steam bath to constant weight. The chloroform extracts were dissolved in diethyl ether and treated with diazomethane [36]. The dried methanol extracts were dissolved in methanol at 0.1 mg mL−1 prior to HPLC analysis.

2.2. Total Polyphenol Contents

Total polyphenol contents were determined according to the Folin-Ciocalteu colorimetric method [37], using p-coumaric acid as reference. The analyses were carried out in triplicates of each sample.

2.3. Total Flavonoid Contents

Total flavonoid contents were determined by the aluminium chloride [37] and dinitrophenylhydrazin [38] methods. Calibration curves were made using quercetin (aluminium chloride method) and pinocembrin (dinitrophenylhydrazin method) as reference. Total flavonoid contents were assumed to be the sum of the values obtained by each method. Analyses were performed in triplicates.

2.4. GC/EIMS Analysis

The diethyl ether solutions of the diazomethane-treated chloroform extracts were diluted to the 1000 ppm concentration. Ether solutions (1 μL) of each extract was injected into a Hewlett Packard 5890 series II plus gas chromatography coupled to Chem Station System Mass Spectrometer 5989B operating with the EI mode at 70 eV. The GC conditions were as follows: DB-5HT fused silica capillary column (30 m × 0.32 mm internal diameter, 0.25 μm film thickness) held at 100°C for 1 min and then heated to 300°C at 6°C min−1, the final temperature being held constant for 2 min; He was used as a carrier gas with flux of 1.5 mL min−1, linear velocity of 63 cm s−1, total flow 77,3 mL min−1, and split mode and solvent cut time of 3.0 min. The MS conditions were as follows: ionization voltage, 70 eV; filament current, 0.3 mA; detector voltage, −0.7 kV; MS scan range, 40–800 m/z. Injector and detector temperatures were at 300°C. The characterization of the constituents was based on comparison of corresponding mass spectra with data from the libraries Wiley-275 (Hewlett Packard), Wiley/NBS, and McLafferty and Stauffer [39].

2.5. HPLC/DAD/ESI/MS Analysis

Methanol extracts (10 μL) were analyzed by HPLC/DAD/ESI/MS and HPLC/DAD/ESI/MS/MS. DAD SPD-M10Avp Shimadzu equipped with a photodiode array detector coupled to Esquire 3000 plus, Bruker Daltonics mass spectrometer via an electrospray ionization (ESI) source. The analyses were controlled by a computer running the Esquire NT Software from Bruker Daltonics. The diode-array detector was set at 270 nm, and the online UV spectra were recorded in the range of 250–360 nm. A reverse phase C18, Zorbax-5B-RP-18 (Hewlett Packard) column (4.6 × 250 mm, 5 μm), and different linear gradients were used for analysis of each sample. The mobile phases consisted of eluent A (0.1% aq. HOAc) and eluent B (methanol). For the Ponta Grossa sample, the following gradient program was used: 0 min, 5% B; 10 min, 10% B; 16 min, 30% B; 72 min, 86% B. For the Picos, Pirenópolis, Lavras, Bauru, and Pariquera-Açu samples the following program was used: 0 min, 10% B; 12 min, 35% B; 27 min, 38% B; 50 min, 50% B; 100 min, 100% B. For the Cabo Verde sample, the program was 0 min, 10% B; 12 min, 20% B; 52 min, 40% B; 75 min, 86% B. For the Mira Bela sample, the program was 0 min, 5% B; 10 min, 10% B; 16 min, 34% B; 60 min, 78% B. The flow rate was 0.5 mL min−1 and the temperature of the column was maintained at 28°C. Negative-ion ESI was performed using an ion source voltage of −40 V and a capillary offset voltage of 4500 V. Nebulization was aided with a coaxial nitrogen sheath gas provided at a pressure of 27 psi. The dry gas temperature was set to 130°C and a dry gas flow of 4 L min−1 was used. Desolvation was assisted using a counter current nitrogen flow set at a flux of 7.0 L min−1 and a capillary temperature of 320°C. Mass spectra were recorded over the range 50–900 m/z. Mass spectrometry (MS/MS) data were acquired in the negative ionization mode. Compounds were identified by comparison of their UV and ESI/MS and ESI/MS/MS spectra with the literature data.

2.6. Clustering Analysis

Compounds identified by GC/MS and HPLC/MS of all eight propolis samples were analyzed using the neighbor-joining method and the software PAUP v.4.0b10 [40].

3. Results and Discussion

A wide variety of total phenols (0,9% to 27,3%) and total flavonoids (0,3% to 4,4%, Table 1) were observed. It is known that the amount of phenolic and flavonoid constituents varies widely according to propolis types and seasonal factors [24, 28]. The highest amounts of both total phenolic substances and flavonoids were obtained with propolis from Pirenópolis (27.341% and 4.432%, resp.) and Cabo Verde (25.867% and 3.148%, resp.) (Table 1). The main constituents found in the Pirenópolis sample were flavone-C-glycosides, prenyl flavonols, and rhamnetin, while in the propolis sample from Cabo Verde only flavone-C-glycosides and a minor content of caffeoylquinic derivatives were detected. Samples from Bauru, Ponta Grossa, and Lavras have intermediate contents of total phenolics (17.632%, 12.892%, and 9.281%, resp.) and showed the presence of caffeoylquinic derivatives, phenylpropanoids, and flavones. Finally, samples from Picos, Pariquera-Açu, and Mira Bela presented lower contents of total phenolics (5.620%, 2.66%, and 0.91%, resp.) and higher caffeic acid glucoside. In South America, the contents of phenols reported for Brazilian propolis have been higher than the values obtained from samples of other countries: Argentina (0,3%–5,5%), Uruguay (1,1%–3,7%), Chile (1,1%–4,3%), Peru (less than 0,1%), and Paraguay (0,3%) [14].

SamplesTotal phenols (%) Flavonoids contents (%)Total flavonoids (%)
DNP methodAlCl3 method

Pirenópolis (GO)
Cabo Verde (BA)
Bauru (SP)
Ponta Grossa (PR)
Lavras (MG)
Picos (PI)
Pariquera-Açu (SP)
Mira Bela (MG)

On the other hand, samples from Bauru, Picos, Pariquera-Açu, Ponta Grossa, Lavras, and Mira Bela showed low contents of total flavonoids: 1.97%, 1.243%, 0.884%, 0.859%, 0.685%, and 0.311%, respectively. It is interesting to note that all samples, except from Bauru, present flavone C-glycosides among their constituents. However, only the mentioned sample exhibited high content of caffeic acid ethyl phenyl ester derivatives. Among the samples studied in the present work, there seems to be a direct correlation between the contents of total phenols and total flavonoids (Table 1).

A high diversity of phenolic and nonphenolic substances was detected among the samples analyzed. Compounds 152 were present in less polar (chloroform) extracts and were detected and characterized by GC/EIMS analysis (Table 2). Several substances detected are wax constituents: long carbon chain fatty acids (8, 11, 13, 15, 32, and 34) and n-alkanes (33, 36, and 37). Hydrocarbons and fatty acids have been pointed out as major constituents of wax propolis [36, 41]. Other detected substances are phenolic compounds, many of them prenylated. Such substances have been pointed out as constituents of Baccharis dracunculifolia and/or Brazilian green propolis: 1, 3, 5, 9, 10, 14, 24, 25, 28, and 35 [12, 24, 42]. Compounds 3 and 14 (artepillin C) have been assigned the role as chemical markers of green propolis [12]. Terpenoids are frequent propolis constituents. Among them, diterpenoids (17, 19, and 23) have been reported for Brazilian propolis [43]. Triterpenoids (40, 4352) are also frequent constituents of Brazilian propolis (see, e.g., [24, 42]). Steroids, such as ergosterol (42), are terpenoids rarely found in propolis. A particularly interesting compound in Table 2 is the glyceride 39, comprising of two residues of phenylpropanoid. Compounds such as this are constituents of Populus species and were obtained from a sample of Mexican propolis from the Sonora state [44], but the origin of 39 is certainly not a Populus plant.

CompoundsRt (min)Molecular ion

14-Vinyl phenol4.2120 (100, C8H8O+)
2Dihydrocinnamic acid methyl ester6.4164 (40, ), 104 (100, ), 91 (60)
3p-Vinyl-O-prenyl phenol9.7188 (50, C13H16O+), 133 (100, C9H9O+)
42-T-butylnaphto-[2,3-b]-furan,4,9-dione13.5254 (30, ), 239.0 (100, M–CH3)
5p-Hydroxycinnamic acid methyl ester13.5178 (54, ), 147 (100, ), 119 (41, C8H7O+), 91 (60)
6Methyl-O-benzoylbenzoate 13.7240 (15, C15H12O3), 209 (17), 163 (100), 105 (78), 77 (73)
7Benzene ethoxy 13.8122 (13, C8H10O), 105 (16), 93 (70), 91 (24), 79 (32), 77 (21)
8n-Hexadecanoic acid methyl ester14.5270 (3) (C17H34O2), 143 (12), 87 (53), 74 (100)
9Allyl-3-prenylcinnamate14.5256 (64, ), 201 (84, ), 185 (100, ), 157 (60, ), 145 (95, )
102,2-Dimethylchromene-6-propenoic acid methyl ester15.5244 (11), 229 (100), 144 (6)
11Palmitic acid16.4256 (5, C16H32O2), 241 (8), 187 (14), 121 (51)
12Pinobanksin methyl ether16.6286 (C16H14O5) (10), 271 (100)
13Oleic acid methyl ester16.7296 (1) (C19H36O2), 264 (6)
144-Hydroxy-3-prenylcinnamic acid methyl ester16.7246 (70, ), 191 (100, ), 171 (20), 131 (23)
15n-Stearic acid methyl ester17.2298 (1) (C19H38O2), 242 (7), 143 (18), 87 (70), 74 (100)
16Ferulic acid octadiene ester17.8302 (20, C18H22O4), 287 (40), 271 (26), 257 (13), 246 (47), 231 (76), 203 (100), 187 (83)
17Methyl dehydroabietate17.8314 (8, C21H30O2), 299 (10), 239 (100), 141 (14), 128 (14)
18n-propyl-P-hydroxybenzoate18.2180 (5, C10H12O3), 161 (11), 121 (100), 105 (18), 91 (15), 77 (11)
1912,16-Epoxy-6-hydroxy-(15-16)-abeo-5,8,11,13-abietatetraene-7-one18.2312 (17, C20H24O3), 241 (5), 237 (100), 197 (25)
20Pentyl benzene18.6148 (16, C11H16), 133 (23), 121 (62), 105 (51), 91 (69), 77 (50)
21Ferulic acid octene ester19304 (29, C18H24O4), 271 (22), 247 (8), 246 (100), 231 (68), 199 (23), 191 (21), 187 (42), 185 (12), 131 (36), 177 (28), 131 (36), 115 (30), 105 (14), 91 (23), 77 (19)
22n-Phenyl hexadecane19.2302 (9, C22H38), 287 (10), 235 (8), 175 (31), 119 (51), 105 (61), 91 (77), 77 (63)
23Ethyl dehydroabietate19.5328 (25, C22H32O2), 268 (9), 254 (17), 253 (100), 187 (24), 156 (12), 141 (14)
24Hydroxy-diprenylcinnamic acid methyl ester (artepillin C)20.6314 (68, ), 259 (100, ), 243 (54, ), 211 (38), 203 (90, )
252,2-Dimethyl-8-prenylchromene-6-propenoic acid methyl ester20.7312 (14), 297 (100)
26Pinobanksin-5-methyl ether acetate20.9328 (28, ), 257 (89, M − 71), 313 (15)
27Benzoic acid, 4(4-hydroxybenzoyl)-methylester21.2256 (6, ), 241 (9), 161 (12), 121 (100), 147 (11)
283-Hydroxy-2,2-dimethyl-8-prenylchromane-6-propenoic acid methyl ester21.4330 (100, ), 297 (30, ), 272 (50, ), 225 (60, ), 197 (50, ), 171 (50)
29Benzoic acid, 2-propoxy-(4-hydroxybenzoyl)-methyl ester 21.8314 (3, C18H18 O5), 121 (100), 109 (21), 105 (25), 91 (30), 81 (47)
30Benzylic alcohol, 2-propoxy-(4-hydroxybenzoyl)-methyl ester22316 (4, C18H20 O5), 301 (4), 257 (10), 189 (22), 147 (10), 121 (100), 105 (26)
31Benzoic acid, 2(4-hydroxybenzoyl)-methyl ester22.7256 (10), 255 (50), 121 (100), 105 (33), 91 (44), 77 (35)
32n-Docosanoic acid methyl ester23354 (4) (C23H46 O2), 87 (70), 74 (100)
33n-Heptacosane23.11C27H56: m/z 380, C27
34n-Tetracosanoic acid methyl ester23.4382 (4, C25H50 O2), 143 (14), 87 (60), 74 (100)
354-Dihydrocinnamoiloxy-3-prenylcinnamic acid methyl ester24.7378 (2, ), 246 (84, ), 105 (82, ), 91 (100)
36n-Nonacosane24.9C29H60: m/z 408, C29
37n-Hentriacontane26.7(C31H64): m/z 436, C31
38Carbomethoxy benzyl caffeate ester26.9328 (60) (C18H16O6), 327 (50), 285 (40), 268 (33), 207 (40), 181 (40), 150 (40), 135 (100), 115 (40), 107 (30), 105 (30), 94 (30), 91 (45), 77 (60)
39Dihydrocaffeoyl-dihydrocinnamoyl-glyceride27.21430 (9, C23H26O8), 399 (9), 380 (25), 281 (25), 232 (30), 180 (25), 175 (29), 161 (100), 105 (12), 95 (11), 93 (9), 81 (16), 77 (16)
40β-Amyrin28426 (16, C30H50O+), 408 ( ), 218 (100, ), 203 (40, ), 189 (25, )
41Propyl carbomethoxy benzyl dihydrocaffeate ester28.1372 (24, C21H24 O6), 371 (26), 357 (70), 314 (30), 299 (30), 207 (42), 167 (30), 135 (100), 107 (50), 91 (50), 93 (50), 95 (57), 77 (69)
42Ergosterol28.96396 (16, C28H44O), 381 (26), 281 (35), 232 (35), 217 (34), 207 (19), 165 (10), 164 (27), 161 (30), 151 (39)
43Lupenone29.5424 (7, C30H48O), 218 (50), 205 (100), 189 (50), 177 (50), 109 (56), 105 (24)
44β-Amyrinone30.5424 (6, C30H48O), 218 (100), 205 (60), 203 (40), 189 (23)
45 -Amyrinone30.9424 (6), 218 (100), 205 (60), 203 (20), 189 (23)
46 -Amyrin31426 (6, C30H50O), 411 (15), 218 (100), 207 (90), 203 (18), 189 (24)
47β-Amyrin acetate31.6468 (1, C32H52 O2), 218 (100), 203 (40), 189 (45)
48α-Amyrin acetate32.5468 (1, C32H52 O2), 218 (100), 203 (20), 189 (35)
49Taraxerone33.4424 (4), 205 (80), 189 (76), 109 (74), 69 (100)
50Oleanene33.9410 (95), 395 (100, M–CH3), 174 (40), 165 (58)
51Pteron-14-en-7-one35.6424 (66), 409 (100), 383 (64), 371 (56), 165 (50)
52Olean-14-en-3,28-dione36.2440 (30, C30H46 O2), 425 (100), 409 (78), 397 (76), 385 (60), 183 (75), 165 (70)

Table 3 lists substances (53133), mostly phenolic compounds, detected and characterized by HPLC/DAD/ESIMS. Caffeic acid (73) is very frequent in association with quinic acids or sugars. For example, in Table 3 several substances are caffeoylquinic acids, comprising of 1–3 residues of caffeic acid (57, 60, 62, 65, 66, 75, 84, 86, 87, 93, 100, 104, 106, and 107). Such compounds are characteristic and abundant constituents of green propolis, obtained ideally from aqueous extracts [45, 46]. In some cases, one residue of caffeic acid is replaced by other phenylpropanoid, such as ferulic acid (61, 67, 68, and 113). In rare cases, quinic acid is esterified solely by ferulic acid (72). For the monocaffeoylquinic acids isomers, such as chlorogenic acids, the mass spectra in negative ion mode exhibited intense [M–H] ions at m/z 353.0 and some diagnostic fragments, due to caffeic (m/z 179) and quinic acid (m/z 191) moieties (57, 60, 62, 66, and 75). Di-O-(E)-caffeoylquinic acid positional isomers showed UV spectra identical to the monocaffeoylquinic acid derivatives and exhibited m/z 515.0 as deprotonated molecular ion, suggesting positional isomers of a quinic acid esterified with caffeoyl units at m/z 179, 191, and 353 [M–H–caffeoyl] (84, 86, 87, 93, and 104). Tricaffeoylquinic acid showed a deprotonated molecule at m/z 677.1 (65, 106, and 107). In general, tricaffeoylquinic acids with larger numbers of free equatorial hydroxyl groups in the quinic acid residue are more hydrophilic than those with larger numbers of free axial hydroxyl groups.

CompoundRt (min)UV/DAD[M–H]Proposed structure

534.9270181Homovanillic acid
545.5300, 330341.2Caffeic acid 4-O-glucoside
555.7ND191.1Quinic acid
5716.1330, 300353Caffeoylquinic acid
5816.3300, 330311Caffeic acid 4-O-arabinoside
5919.5300, 330311.2Caffeic acid 4-O-xyloside
6019.6300, 330353.1Caffeoylquinic acid
6120.3330, 300529Feruloyl-caffeoylquinic acid
6220.4300, 330353.3Caffeoylquinic acid
6321.9ND183Methoxy-dihydroxy benzoic acid
6422.1270, 340475.5Dimethoxy-luteolin-glucoside
6522.3300, 330677.1Tricaffeoylquinic acid
6622.3330, 300353.5Caffeoylquinic acid
6722.3330, 300529Feruloyl-caffeoylquinic acid
6822.7330, 300529Feruloyl-caffeoylquinic acid
7023.9280, 330sh433.3Naringenin-C-glucoside
7124270, 338577.5Apigenin-O-rutinoside
7224.3300, 330367.5Feruloylquinic acid
7324.9ND179.3Caffeic acid
7425.2ND435.1Delphinidin arabinoside
7525.7330, 300353.3Caffeoylquinic acid
7626.4ND421.2Catechin arabinoside
7727.1270, 338577.1Apigenin-di-C-glucosyl rhamnoside
7827.4270, 338415.3Apigenin-C-rhamnoside
7927.7270, 338593.1Apigenin-6,8-di-C-glucoside (vicenin-2)
8028.3270, 338 547Apigenin-C-rhamnosyl arabinoside
8128.8270, 340563.5Apigenin-6-C-glucosyl-8-C-arabinose (isoschaftoside)
8229.3270, 340 415.4Apigenin-C-rhamnoside
8329.6270, 338461Luteolin-O-glucuronide
8433.6300, 330515.4Dicaffeoylquinic acid
8535.8330, 300315Caffeic acid-dihydroxy phenyl ethyl ester
8636300, 330515.8Dicaffeoylquinic acid
8737.2330, 300515Dicaffeoylquinic acid
8838.6270, 340563.6Apigenin-8-C-glucosyl-6-C-arabinose (schaftoside)
8941.4270, 340609.4Luteolin-6,8-di-C-glucoside (lucenin-2)
9042.7270, 340579.3Pentosyl orientin
9142.8270, 340431Vitexin
9345.8ND515.3Dicaffeoylquinic acid
9448.4330, 300375.1Ferulic acid-methoxy trihydroxy phenyl ethyl ester
9549.1310231.2Hydroxy-prenylcinnamic acid
9649.8310315.43-Prenyl-4-(2-methylpropionyloxy)-cinnamic acid methyl ester
9752.3270, 340489.8Luteolin acetylglucoside
9852.5270, 340461.2Chrysoeriol-C-glucoside
9953.1280623.4Dimethoxy naringenin-diglucoside
10053.8300, 330529.7Caffeoylferuloylquinic acid
10154.1270, 340593.3Apigenin-di-O-glucoside
10254.6256, 356433Quercetin-O-arabinoside
10355.5260, 355447.1Quercetin-O-rhamnoside
10456.3300, 330515.9Dicaffeoylquinic acid
10556.6260, 350477.1Isorhamnetin-glucoside
10658.8300, 330677.4Tricaffeoylquinic acid
10759.8330, 300677.3Tricaffeoylquinic acid
10860.4270, 335445.1Apigenin-O-glucuronide
10960.5ND389.3Diprenyl chrysin
11060.6330329Ferulic acid dihydroxy phenyl ethyl ester
11165.9260, 353301.2Quercetin
11266ND309.1Cinnamoyl hexoside
11366.5330, 300529.6Caffeoylferuloylquinic acid
11467.9256, 356315.1Isorhamnetin
11570.6256, 356315.1Rhamnetin
11671.2255, 354331Laricitin
11772.1310315.53-Hydroxy-2,2-dimethyl-8-prenylchromane-6-propenoic acid
11872.3230, 350299.1Methyl licochalcone B
11973310299Hydroxy-diprenylcinnamic acid (artepillin C)
12073.9256, 356329.1Quercetin-dimethyl ether
12174.2ND387.4Pentamethoxy hydroxy flavonol
12276.9ND371.6Pentamethoxy flavonol
12479.1ND399.5Chrysin rhamnoside
12683.2255, 355383.4Prenyl-methoxyquercetin
12786260, 370273.1Phloretin
12887.5260, 360383.3Prenyl-methoxyquercetin
12988.1260, 360367.1Prenyl-methoxykaempferol
13189.9260, 355381.2Prenyl-dimethoxykaempferol
13291.1260, 350381.8Prenyl-dimethoxykaempferol
13393.1260, 360395.2Prenyl-trimethoxykaempferol

Glycosides are not frequent in propolis. Glycosides of caffeic acid (54, 58, and 59) have rarely (if at all) been reported as propolis constituents. C-glycosyl and O-glycosyl flavonoids were found in stingless bee honeys [47]. In the honey of Apis mellifera the contents of aglycone flavonoids typical of propolis (galangin, pinocembrin, quercetin) were found to be much higher than the contents of flavonoid glycosides. This has been attributed to a contamination of the honey by plant resins and propolis [48].

It has been recognized that flavonoids are not major constituents of Brazilian propolis, with the exception of isoflavonoids in red propolis [25]. Nonetheless, several flavonoid aglycones, as well as O- and C-glycosides, were detected in several among the eight samples of propolis in the present work: 56, 64, 6971, 74, 7683, 8892, 9799, 101103, 105, 108, 109, 111, 114116, 118, and 120133. The glycosylation of flavonoids generally occurs at the 7-hydroxyl in flavones and at the 3- and 7-hydroxyls in flavonols. The sugars usually correspond to hexoses (glucose, galactose, and rhamnose) and pentoses (arabinose and xylose). The carbon-carbon bond of C-glycosyl flavonoids is resistant to rupture and consequently fragments from the sugar moiety predominate in the mass spectra of C-glycosides.

Flavone derivatives presented UV spectra with at 270.0 and 340.0 nm. The ESI-MS spectra of compound 79 (vicenin-2) showed deprotonated molecule [M–H] at m/z 593.0. The MS/MS spectrum in the negative ion mode produced ions at m/z 575.1 [M–H − 18], m/z 503.0 [M–H − 90] and a base peak at m/z 473.1 [M–H − 120], suggesting hexoses as sugar moieties. The fragment ions at m/z 353.4 [aglycone + 83] and m/z 383.2 [aglycone + 113] suggest that the aglycone is apigenin (270) + glucose + glucose, according to the literature data [49, 50]. The ESI-MS spectra of compound 81 (isoschaftoside-apigenin-8-C-glucosyl-6-C-arabinose), and compound 88 (schaftoside-apigenin-6-C-glucosyl-8-C-arabinose), showed identical deprotonated molecule at m/z 563.0 and exhibited similar fragmentation patterns: m/z 545.0 [(M–H) − 18], m/z 473.1 [(M–H) − 90], m/z 443.1 [(M–H) − 120], m/z 383.2 [aglycone + 113], and m/z 353.4 [aglycone + 83]. In addition, they yielded the ion [M–H − 60] at m/z 503.0, generated by the fragmentation of a pentose in the MS/MS spectra, suggesting the presence of an arabinose moiety (−132 u), typical of asymmetric di-C-glycosylflavones. Isoschaftoside (81) showed a base peak at m/z 473 and a high abundance of the fragment at m/z 503.0, indicating the presence of a 6-C-pentosyl unit [51].

For O-glycosylated flavonoids, fragmentation pathway starts with the cleavage of the glycosidic bonds and elimination of the sugar moieties, with charge retention on the aglycone [52]. Tentative identification was based mainly on the MS data, UV-DAD spectra, and literature data.

Compounds 83 (luteolin-O-glucuronide - m/z 461.0) and 108 (apigenin-O-glucuronide - m/z 445.1) both underwent loss of a glucuronide moiety with 176 u. Compound 90 (pentosyl-orientin) yielded a deprotonated molecule ion at m/z 579.0 and its MS/MS spectrum produced ions at m/z 327.0 [M–H − (120 + 132)] and the loss of 132 u corresponding to a pentose moiety. This fragmentation pattern is typical of O-glycosylated C-glycosyl flavones [53], indicating a pentose O-linked to a C-linked glucose.

Compound 99 (dimethoxy-naringenin-diglucoside) exhibited UV maximum absorption at 280.0 nm and a deprotonated molecule ion at m/z 623.4. Its MS/MS analysis produced ions at m/z 533.1 (M–H − 90.0), m/z 503.1 (M–H − 120.0), m/z 413.1 [aglycone + 113.0], and m/z 383.1 [aglycone + 83.0]. To our knowledge, this is the first report of this compound for propolis, having previously been identified from Citrus genotypes [54].

Among the constituents identified stand out the prenylated flavonols 109, 125, 126, and 128133. Prenylated phenylpropanoids typical of Brazilian green propolis were also detected, such as compounds 95, 96, 117, and 119 (artepillin C).

The chemical affinities among the analyzed propolis samples are shown in Figure 2. One of the clusters of the dendrogram combines the samples from Bauru (SP, southeast), Lavras (MG, southeast), and Cabo Verde (BA, northeast). It is somewhat surprising the emergence in this cluster of the sample from the latter locality, which is much up north from the commonly admitted distribution of green propolis. The three samples share several prenylated phenylpropanoids (e.g., 9, 14, 24, 25, and 35) typical of green propolis (Table 4). The sample from Cabo Verde stands apart in the clade for the more frequent possession of flavonoid glycosides, for example, 8891, 98, 99, and 101 (Table 4). Flavonoids are major compounds in propolis from temperate regions, derived from exudates from the vegetative buds of Populus spp. [19, 55]. However, flavonoids commonly detected in propolis are aglycones, and only rare flavonoid glycosides have been reported as propolis constituents.


14-Vinyl phenolxx
2Dihydrocinnamic acid Methyl esterx
3p-Vinyl-O-prenyl phenolx
5p-Hydroxycinnamic acid methyl esterx
6 Methyl-O-benzoylbenzoate x
7Benzene ethoxy x
8n-Hexadecanoic acid methyl esterxx
102,2-Dimethylchromene-6-propenoic acid methyl esterx
11Palmitic acidx
12Pinobanksin methyl etherx
13Oleic acid methyl esterx
144-Hydroxy-3-prenylcinnamic acid methyl esterxxx
15n-Stearic acid methyl esterx
16Ferulic acid octadiene esterx
17Methyl dehydroabietatexx
20Pentyl benzenex
21Ferulic acid octaene esterx
22n-Phenyl hexadecanex
23Ethyl dehydroabietatexx
24Hydroxy-diprenylcinnamic acid methyl ester (artepillin C)xxx
252,2-Dimethyl-8-prenylchromene-6-propenoic acid methyl esterxxxx
26Pinobanksin-5-methyl ether acetatex
27Benzoic acid, 4(4-hydroxybenzoyl)-methylesterx
283-Hydroxy-2,2-dimethyl-8-prenylchromane-6-propenoic acid methyl esterxx
29Benzoic acid, 2-propoxy-(4-hydroxybenzoyl)-methyl ester x
30Benzylic alcohol, 2-propoxy-(4-hydroxybenzoyl)-methyl esterx
31Benzoic acid, 2(4-hydroxybenzoyl)-methylesterx
32n-Docosanoic acid methyl esterx
34n-Tetracosanoic acid methyl esterx
354-Dihydrocinnamoiloxy-3-prenylcinnamic acid methyl esterxxx
38Carbomethoxy benzyl caffeate esterx
41Propyl carbomethoxy benzyl dihydrocaffeate esterx
47β-Amyrin acetatex
48α-Amyrin acetatexx
53Homovanillic acidx
54Caffeic acid 4-O-glucosidexxxxxx
55Quinic acidxxxx xxx
57Caffeoylquinic acidx
58Caffeic acid 4-O-arabinosidex
59Caffeic acid 4-O-xylosidex
60Caffeoylquinic acidxxxx
61Feruloyl-caffeoylquinic acidxx
62Caffeoylquinic acidx
63Methoxy-dihydroxy benzoic acidx
65Tricaffeoylquinic acidxx
66Caffeoylquinic acidx
67Feruloyl-caffeoylquinic acidxx
68Feruloyl-caffeoylquinic acidxx
72Feruloylquinic acidxx
73Caffeic acidx
74Delphinidin arabinosidexx
75Caffeoylquinic acid xxx
76Catechin arabinosidex
77Apigenin-di-C-glucosyl rhamnosidex
79Apigenin-6,8-di-C-glucoside (vicenin-2)xxxx
80Apigenin-C-rhamnosyl arabinosidexx
81Apigenin-6-C-glucosyl-8-C-arabinose (isoschaftoside)xxxx
84Dicaffeoylquinic acidxxxxx
85Caffeic acid-dihydroxy phenyl ethyl ester x
86Dicaffeoylquinic acidxx
87Dicaffeoylquinic acidxx
88Apigenin-8-C-glucosyl-6-C-arabinose (schaftoside)xxxx
89Luteolin-6,8-di-C-glucoside (lucenin-2)x
90Pentosyl orientinx
93Dicaffeoylquinic acidxxxxx
94Ferulic acid-methoxy trihydroxy phenyl ethyl esterx
95Hydroxy-prenylcinnamic acidx
963-Prenyl-4-(2-methylpropionyloxy)-cinnamic acid methyl esterx
97Luteolin acetyl glucosidexx
99Dimethoxy naringenin-diglucosidex
100Caffeoylferuloylquinic acidx
104Dicaffeoylquinic acidxxxx
105Isorhamnetin-glucoside x
106Tricaffeoylquinic acidxxxx
107Tricaffeoylquinic acidx
109Diprenyl chrysin x
110Ferulic acid dihydroxy phenyl ethyl esterx
112Cinnamoyl hexosidex
113Caffeoylferuloylquinic acidx
116Laricitin x
1173-Hydroxy-2,2-dimethyl-8-prenylchromane-6-propenoic acidx
118Methyl licochalcone Bx
119Hydroxy-diprenylcinnamic acid (artepillin C)x
120Quercetin-dimethyl ether x
121Pentamethoxy hydroxy flavonolx
122Pentamethoxy flavonol x
124Chrysin rhamnosidex
127Phloretin x

The samples from Pariquera-Açu (SP, southeast) and Ponta Grossa (PR, south) contain also some of these green propolis constituents but emerge at the base of the clustering analysis tree (Figure 2). Both contain substances rarely or never reported for green propolis, such as flavonoid glycosides (e.g., 81, 88, and 97; Table 4). They also contain or share diterpenes, such as 17 and 23 (Table 4), a class of substances known to occur in Brazilian propolis [43, 56, 57] and abundant in Mediterranean propolis [20, 58].

The samples from Mira Bela (MG, southeast), Pirenópolis (GO, Central Brazil), and Picos (PI, central-north) constitute another cluster, in spite of the large distances among the localities. The chemical composition of Mira Bela stands out by the total absence of nonpolar constituents from the chloroform extract (Table 4). It is worth noting that triterpenes (4252; Table 4) were detected only in black propolis samples (from Picos and Pirenópolis). Besides this, both samples contain, and sometimes share, wax constituents, such as fatty acids (e.g., 32, 34) and n-alkanes (e.g., 33, 36, and 37; Table 4). Flavonoids were more often detected in the samples from this cluster. Examples are the aglycones quercetin (111), isorhamnetin (114), and rhamnetin (115; Table 4). In addition, the sample from Mira Bela is characterized for containing flavone C-glycosides, such as 77, 79, 80, and 82 (Table 4). The long branches corresponding to the samples of Picos and chiefly of Pirenópolis indicate a high number of exclusive characteristics. The sample from Picos is particularly characterized by flavonol-O-glycosides: 92, 102, 103, and 105. A remarkable characteristic of the sample from Pirenópolis is represented by prenylated flavones (109) and flavonols (125, 126, and 128133; Table 4). The present work is the first report of prenylated flavonoids for Brazilian propolis. Prenyl-flavonoids are a rare feature in Neo-Tropical propolis but are characteristic in propolis derived from Macaranga spp., having been reported from Okinawa [59] and other localities, such as Egypt and Kenya [12]. Prenylation of aromatic compounds is a chemical feature enhancing biological activities [60]. Another interesting compound from the Pirenópolis sample is the glyceride 39 (Table 4). The frequent detection of flavonoids in the samples from Picos and Pirenópolis is coherent with the high amount of total flavonoids shown in Table 1.

4. Conclusions

Compounds derived from Baccharis dracunculifolia (alecrim-do-campo plant) are often found in Brazilian propolis, despite considerable chemical differences among them. Propolis samples from the typical distributional zone of alecrim-do-campo plant (southeast of Brazil) may have little or no chemical affinity at all with green propolis. On the other hand, samples from the northeast of Brazil, such as from Cabo Verde, may have high chemical affinity with green propolis. Analysis of propolis from distinct regions of Brazil is likely to provide chemical substances rarely found in propolis (such as flavonoid glycosides) and substances with high biological activity (such as prenylated flavonoids).


The authors are grateful to FAPESP and CNPq for financial support and to Apiários Martins, Breyer and Cia, Mellilotus Ltda, Melnor Wenzel Ltda, and Pronatu Ltda for the supply of propolis samples.


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