INTRODUCCIÓN
The rational breeding of stingless bees called meliponiculture is becoming a common and widespread practice in Brazil (Machado et al., 2019; Klein et al., 2020; Moreno, 2020). In the Amazon, there are many factors with potential for domestication and use of these bees known as yellow Jandaíra Melipona (Michmelia) seminigra seminigra, Friese, 1903 that besides pollinators of wild and cultivated species, are also used for honey, propolis and pollen production (Ribeiro et al., 2018; Silva et al., 2020; Souza et al., 2020). The pollen is mainly composed of proteins, lipids, sugars, fiber, minerals, amino acids and vitamins Camarena & Miranda (2017). It is a biological sti- mulant and human use has been for both purposes as for food and for medicinal purposes. It also has a content of essential nutrients for keeping bees, plus antioxidants and polyphenols (Ares et al., 2018; Végh et al., 2021). Animal studies have shown the use of pollen in the treatment of iron deficiency anemia (Rzepecka-Stojko et al., 2015; Visquert, 2015), increased calcification of bone components (Tomaszewska et al., 2020), inhi- bition of osteoclastic resorption (Haščík et al., 2017) with anti-inflammatory effect (Denisow & Denisow-Pietrzyk, 2016; Li et al., 2019), deto- xifying properties of organochlorine pesticides (El-Ballal et al., 2019; Nassar et al., 2020), acts in mitigation of chemotherapy side effect (Kocot et al., 2018; Mărgăoan et al., 2019) and as an immu- nostimulant and anti-allergic agent (Khalifa et al., 2021). Also, increase apoptosis in ovarian cysts due to its phytoestrogenic properties (Naseri et al., 2021). Moreover, bee pollen polysaccharide from Rosa rugosa Thunb. (Rosaceae) promotes pancreatic β-cell proliferation and insulin secre- tion (Yang et al., 2021). In addition, pollen can be used to prevent some diseases that harm human health (Aylanc et al., 2021). Other studies using pollen have also demonstrated antifungal, anti- microbial, antiviral, hepatoprotective, anticancer and local analgesic action (Asoutis et al., 2020; Özkök et al., 2021), as well as polyunsaturated fatty acids, organic acids, some secondary meta- bolites such as phenolic acids, flavone aglycones and phenolamides (Qiang et al., 2018; Zhang et al., 2022). Also, vitamins such as β-carotene are commonly found in bee pollen (Salazar et al., 2020; Torres et al., 2020). For the other side were verified essential and non-essential amino acids (Thakur & Nanda, 2020; Ecem et al., 2021). Quality control of food intends to enhance good practice in hygiene procedures and food handling, establishing identity parameters and mini- mum requirements for the quality of bee pollen (ANVISA, 2001). In addition to fungi, mycotoxins and bacteria (Sinkevičienė et al., 2019; Jesus et al., 2021; Nuvoloni et al., 2021), inorganic con- taminants are also present in the bee pollen, as is the case analyzed with dehydrated bee pollen samples from the Brazilian South, which obtained levels of Ba followed of V, Li, Cd and Pb (Sattler et al., 2016). Despite the nutritional importance of pollen, observed in several investigations all over the world, there is no scientific data on the nutri- tional potential of this product in Amazonian Meliponiculture, especially the native one from the lower Amazon, region where its consumption is restricted to its use in alternative treatment medicine for respiratory infections. This study was aimed at evaluating the microbiological control, physico-chemical composition, plus minerals and amino acids of pollen collected by Melipona seminigra seminigra from a community from lower Amazon, in the state of Amazonas, Brazil, during the rainy and dry periods.
METODOLOGY
The pollen collected by M. seminigra was acquired from meliponary located in Boa Vista do Ramos, belonging to the micro region of Parintins, State of Amazonas, Brazil (2° 58’ 10,93'' S, 57° 35' 20,55"
W), in the 2012 rainy and dry seasons (CNES/ Airbus, 2022). After collecting the pollen, it was dehydrated at 45 °C in an air circulation oven and we proceeded to the analysis for microbiological quality control, using Mac Conkey Agar, desti- ned to the growth of gram-negative and lactose fermentation bacteria. For mycological control, Czapek Yeast Extract Agar (CYA), Sabouraud Agar and Malt Agar were used. The growth of micro- organisms was monitored every 24 hours for five days in cultivations maintained at 25 °C, being all the samples processed in triplicate (Silva et al., 2017). The analysis was performed according to the methodology of the AOAC (1997) for mois- ture, total fat, total protein, carbohydrates and ashes. The macro and micro minerals were analy- zed by atomic absorption spectroscopy (AAS) and 932 plus flame photometer (Malavolta et al., 1997). The nitrogen carbon ratio was analyzed according to the methodology by Pella (1990); Nelson & Sommers (1996); using the vario MAX CN elemental analyzer, at the National Institute de Research of the Amazonia - INPA and amino acids were detected by HPLC (White et al., 1986; Hagen et al., 1989). The water activity in the final product was measured with AquaLab appa- ratus and the analysis pH was performed using Micronal Potentiometer model B374.
RESULTS AND DISCUSSION
PHYSICO-CHEMICAL COMPOSITION
The results of the physico-chemical composi- tion of meliponicola pollen are exposed in Table 1. The pollen samples M. seminigra seminigra showed lower values of moisture content (8,09 g /100 g) however, had high amounts of protein (35,97 and 36,37 g / 100 g) and lipids (22,37 and 29,66 g / 100 g), while ash values (4,46 and 2,83 g / 100 g) during the rainy period (RP) and dry period (DP) were similar when compared to other studies (0,9 - 3,4 g / 100 g ) (Albores-Flores et al., 2021). In addition, Góes (2019), working with M. interrupta in the Parintins municipality region in rainy and dry seasons, did not observe many variations with respect to humidity values of 23,1 and 23,2%; 22,85 and 23,19 g / 100 g of protein; 3,32 and 3,5 g / 100 g of lipids and 2,7 and 3,2 g / 100 g of ashes, respectively. Instead, the physical-chemical composition of bee pollen samples of M. subnitida in Alagoas, Northeast region of Brazil collected during rainy season, presented averages lower values of 7,8 g / 100 g for protein and 2 g / 100 g for lipids (Fernandes et al., 2018). Also, Figueredo et al. (2018), verified existing physical-chemical differences in pollens stored by different species of Meliponas distribu- ted in Alagoas, Pernambuco and Bahia, Northeast of Brazil, being M. escutellaris which presented humidity values (50,05 %); protein (30,37 g / 100 g); lipids (5,99 g / 100 g) and ashes (4,21 g / 100 g). On the other hand, the results found in this investigation were similar to the experi- ments of Sarmento et al. (2016) who worked with M. seminigra and M. interrupta pollen in Manaus, Northwest region of Brazil, being that the physical chemical composition of M. semini- gra pollen was more expressive in terms of values that reached 53,39 % of humidity; 37,63 g /100 g of proteins, 10,81 g /100 g of lipids and 4,03 g /100 g of ashes. In turn, in pollen collected by bees of the genus Melipona in Northeastern from the meliponaries of São Cristóvão, Maranhão and Bahia, Gomes et al. (2019), detected higher amou- nts of protein in M. compressipes (44,41 g / 100 g) and in M. q. anthidioids (39,1 g / 100 g) but lower amounts of lipids (4,79 and 1,48 g / 100 g). The physico-chemical composition of pollen col- lected by Apis mellifera differs from meliponicola pollen. Thereby, in bee-pollen samples from Italy were obtained levels 28,42 g / 100 g of proteins, 2,83 g / 100 g of lipids and 2,85 g / 100 g of ashes (Gabriele et al., 2015). Similar data were obtained in collected pollen samples in South Korea, with protein levels of 26,5 g / 100 g, lipids of 7 g / 100 g and ashes of 5,3 g /100 g (Ghosh & Jung, 2017). Costa et al. (2017), in the state of Sergipe, Brazil obtained 21,91 g / 100 g of proteins, 9,23 g/100 g of lipids and 3,61 g / 100 g of ashes. As well as Gardana et al. (2018), who evaluated phytoche- mical composition in pollen from Spain, Italy and Colombia, reporting 21,6 g / 100 g of protein, 6 g / 100 g of lipids and 2,1 g / 100 g of ashes. In Portugal, Cardoso (2020) obtained 26,26 g / 100 g of protein, 2,20 g / 100 g of lipids and 2,38 g / 100 g of ashes, Thus, Lima (2016) observed that at the end of the rainy season, the pollen collec- ted by the bees had a better protein value (33,18 g / 100 g) when compared to the other seasons of the year. Concluding that exists collect of pol- len during the beginning of the rains, in the dry water transition period and in the rainy period.
Components | RP g / 100 g | DP g / 100g |
Moisture | 8,09 ± 0,82 | 8,39 ± 0,03 |
Protein | 35,97 ± 0,85 | 36,37 ± 0,63 |
Lipids | 22,37 ± 0,69 | 29,66 ± 0,68 |
Ashes | 4,46 ± 0,05 | 2,83 ± 0,23 |
Fiber | 2,17 ± 0,13 | 2,67 ± 0,11 |
Total Carbohydrates | 26,42 | 20,57 |
Nitrogen | 5,758 | 5,819 |
Energy (kcal) | 471,18 | 449,25 |
pH | 4,43 | 4,06 |
Aw | 0,53 | 0,55 |
Soluble Solids (° Brix) | 0,56 | 0,56 |
Carbon/Nitrogen Ratio | 8,94 | 8,28 |
RP: Rainy Period; DP: Dry Period; Aw: Water Activity; pH: Hydrogen Potential; ºBrix: Soluble Solids.
MINERALS AND AMINO ACIDS
In the meliponicola pollen, it was detected the presence of micro minerals such as copper, iron and manganese as well as macro minerals such as calcium, potassium, magnesium and phospho- rus (Table 2), finding iron and manganese in higher concentration during the DP. Macro mine- rals showed no significant difference between the periods evaluated. Worth mentioning that the amount of phosphorus and iron found in the Amazon meliponicola pollen was higher in 95 %. Unlike pollen of stingless bees from Parintins that expressed the highest concentrations of potas- sium, phosphorus, calcium and magnesium both in RP and DP, with the exception of iron and man- ganese whose amounts were lower than those found in this work (Góes, 2019). On the contrary, Kalaycıoğlu et al. (2017) obtained 0,49 g / 100 g (K); but 0,24 g / 100 g (Ca); 0,11 g / 100 g (Mg); 0,02 g / 100 g (Fe); 0,004 g / 100 g (Mn) and 0,001g / 100 g (Cu), likewise Spulber et al. (2018), rea- ched concentrations of 0,43 g / 100 g (K); 0,07 g / 100 g (Mg) and 0,43 g / 100 g (Ca) and only high concentrations of 0,77 g/ 100 g (K) and 0,39 g / 100 g (Mg) determined in the experiments of Taha & Al-Kahtani (2020). Costa et al. (2019), detected 0,74 g / 100 g (K) and 0,69 g / 100 g (P), 0,37 g / 100 g (Ca); 0,17 g / 100 g (Mg); in the states of Sergipe, Piaui and Mato Grosso, too. In addi- tion to Zafeiraki et al. (2022), who analyzed bee pollen samples from Greece and reported higher concentration of K (4,04 g / 100 g), followed by P (0,483 g / 100 g), Ca (0,165 g / 100 g), Mn (0,61 g / 100 g) and Fe (0,149 g / 100 g). In the pol- len of these indigenous bees, both non-essential and essential amino acids essentials are found (Table 3). Among the nonessential amino acids, aspartic acid content (3,07 and 3,10 g / 100 g) and glutamic acid (3,58 and 3,84 g / 100 g) were the highest. On the other hand, within the essen- tial amino acids, it was prevalent leucine [2,62 (RP) - 2,77 (DP) g / 100 g] and lysine [2,42 (RP)- 2,34 (DP) g / 100 g]. Nevertheless, the amounts of amino acids found in the present investiga- tion were surpassed by Gomes et al. (2019), who detected high concentrations of asparagine (11 to 18 g / 100 g); followed by glutamic acid (11 to 13 g / 100 g); proline (8 to 13 g / 100 g) and leucine (8 to 10 g / 100 g) in pollen collected by most of the Meliponas species studied. In other studies, bee pollen from Botucatu, Brazil, it was detected levels of glutamic acid in summer (1,82 g / 100 g) and in winter (1,89 g / 100 g) but the levels of proline during the summer (2,12 g / 100 g) and (2,36 g / 100 g) in winter, were the highest (Negrão & Orsi, 2018). For Taha et al. (2019), five amino acids prevailed in the bee pollens tes- ted: glutamic acid (1,84 g / 100 g), glycine (1,76 g / 100 g), aspartic acid (1,64 g / 100 g), ala- nine (1,34 g / 100 g) and leucine (1,2 g / 100 g). Finally, Al-Kahtani et al. (2020), determined the composition of bee pollen in eastern Saudi Arabia during 4 seasons; showing the highest amounts of glutamic acid (1,69 g / 100 g); glycine (1,67 g / 100 g); aspartic acid (1,62 g / 100 g); leucine content (1,29 g / 100 g); valine (1,03 g / 100 g) isoleucine (0,6 g / 100 g); tyrosine and cysteine (0,2 g / 100 g) in samples collected during spring.
Microminerals | Macrominerals | |||||
Acronym | RP g / 100 g | DP g / 100 g | Acronym | RP g / 100 g | DP g / 100 g | |
Cu | 7,78 | 18,25 | Ca | 3,02 | 3,29 | |
Fe | 61,18 | 81,14 | K | 0,09 | 0,19 | |
Mn | ND | 33,21 | Mg | 0,18 | 0,17 | |
P | 5,79 | 7,09 |
Cu: Copper; Fe: Iron; Manganese: Mn; Calcium: Ca; K: Potassium; Mg: Magnesium; Phosphorus: P; ND: Not detected; Rainy Season: RP; Dry Season: DP.
Amino Acids | |||||
Acronym | RP g / 100 g | DP g / 100 g | Acronym | RP g / 100 g | DP g / 100 g |
Essential amino acids | Nonessential amino acids | ||||
Thr | 1,24 | 1,33 | Gly | 1,54 | 1,67 |
Met | 0,73 | 0,72 | Asp | 3,07 | 3,10 |
Arg | 1,83 | 1,93 | Glu | 3,58 | 3,84 |
Val | 1,71 | 1,11 | Ala | 1,88 | 2,02 |
Phe | 1,57 | 1,65 | Pro | 1,80 | 1,94 |
Lys | 2,42 | 2,34 | Ser | 1,56 | 1,66 |
His | 0,66 | 0,63 | Cys | 0,19 | 0,18 |
Ile | 1,49 | 1,60 | Tyr | 1,05 | 1,94 |
Leu | 2,62 | 2,77 | |||
TOTAL | 28,94 | 30,43 | TOTAL | 14,67 | 16,35 |
Alanine: Ala; Ác.Aspártico: Asp; Ác.Glutámico: Glu Arginine: Arg; Cysteine: Cys; Phenylalanine: Phe; Glycine: Gly; Histidine: His; Isoleucine: Ile; Leucine: Leu; Lysine: Lys; Methionine: Met; Proline: Pro; Serine: Ser; Threonine: Thr; Tyrosine: Tyr; Valine: Val; Rainy Season: RP; Dry Season: DP.
EVALUATING THE MICROBIOLOGICAL CONTROL
The results of the microbiological quality control of dehydrated pollen meliponicola M. seminigra seminigra showed no contamination by total coli- forms, thermotolerant and fungi according to health legislation (ANVISA, 2001).
CONCLUSIONS
In accordance with the results obtained, it can be concluded that in the analysis of quality control of dehydrated pollen there was no contamination by bacteria or fungi responding to the demands of the Brazilian legislation. The physico-chemical analysis of pollen exhibited nutritional amounts that can be incorporated into other ingredients providing enrichment fiber, minerals and protein to food for different age groups of the population, without compromising nutrient consumption and confirming the great potential of this product from the Amazon meliponiculture as a dietary supplement in the human diet.