Open Access
Volume 23, Numéro 6, November-December 2016
Numéro d'article A601
Nombre de pages 7
Section Innovation
Publié en ligne 8 août 2016

© F.S.G. Pereira et al., published by EDP Sciences 2016

Licence Creative CommonsThis is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

1 Introduction

The origin of Moringa oleifera Lamarck is mentioned as a culture that dates from ancient times, coming from Agra and Oudh in India, south of the Himalayas (Foidl et al., 2001); belonging to the Moringaceae family, of single genus, being one of the 13 species (Fahey, 2005). Its cultivation can be done in arid, semiarid and warm areas, with temperatures varying between 25 and 35 °C, being able to tolerate until 48 °C and in weak frost conditions in subtropical areas (HDRA, 2002). It is tolerable to drought and grows with annual precipitation between 250 and 3000 mm in altitudes under 600 m. Furthermore, it evolves in soil with pH varying from 5.0 to 9.0, but it prefers neutral and well-drained soils. It also adapts better in sandy-clay, well-drained soil and it can grow in clay soil without standing water. It does not require soil fertility, developing itself in poor soil as well, starting to flower 8 months after being planted (Crosby, 2007). The production rates of a tree are verified within 3 years of being planted, being able to produce between 1000–1600 seed pods per year with an average of 24 000 seeds. The seed pod frequently coming from the canopies is capable of maintaining and increasing the growth of the leaves and the height control to simplify the seedpods harvesting (HDRA, 2002).

Moringa oleifera (Fig. 1a) is cultivated due to its nutritional value (leaves, green fruits, flowers and roasted seeds); its forage value (leaves, fruits and seeds); its medicinal value (all parts of the plant); its condimental (mainly the roots) and culinary value; its importance to the cosmetic industry (oil extracted from the seeds); its pollen (the flowers); its importance for fuel (wood and oil) and in the water treatment for human consumption (cotyledons and seed teguments) (Crosby, 2007; Jahn, 1989; Morton, 1991).

thumbnail Fig. 1

Plant and some biomasses obtained from moringa. (a) One of the trees used in the collection (Etepam, Encruzilhada, Recife, Brazil, 2014). (b) seed pods opened and closed (30 to 40 cm/average of 16 seeds per pod). (c) seeds, grains (white) and seed husks. (d) cake (or pie) of the mechanical pressing from the grains (seed without husks). (e) pressing oil (front) and extraction oil with hexane (background). (f) mixed purified oil.

Oils and fats are presented as substances gathered into two categories: glycerides and non-glycerides. The glycerides are produced by the esterification of a glycerol molecule with up to three fatty acid molecules (mono, di and triacylglycerols). The non-glycerides are found in small quantities (5% in crude oleaginous and 2% in the refined) such as phosphatides (lectins, cefalins, phosphatidylinositol); sterols (stigmasterol); waxes (cetyl palmitate); insoluble hydrocarbons (squalene); carotenoids; chlorophyll; tocopherols (vitamin E); lactones and methyl-ketone. Those still present in the refined oil, even in small quantity, can change their characteristics due to a peculiar property, as for example a pro or anti-oxidant action, be strongly odoriferous, of concentrated flavour or be highly coloured. The triacylglycerols or triglycerides are insoluble compounds in water and in room temperature have liquid or solid consistency. When in its solid form they are called fat, and under its liquid form, oil. Besides the triacylglycerols, the oils contain various components in smaller scale, such as mono and diglycerides (important as emulsifiers); free fatty acids; tocopherol (important antioxidant); proteins, sterols and vitamins (Reda and Carneiro, 2007).

Due to the versatility of vegetable oils in ordinary applications, this study investigated the oil of the moringa seeds, determining some of their physicochemical properties and the basic structural composition in fatty acids.

2 Material and methods

2.1 Moringa oil extraction by mechanical pressing and by solvent extraction

The oil extraction was preceded by the processing of the moringa seedpods collected between April and May 2014 in Recife, State of Pernambuco, Brazil. The cleaned and suitable pods (Fig. 1b) were separated in pods husks and seeds that generated the grains (seed without husks) and new husks (Fig. 1c). The grains were then converted into cakes (or pies) and crude oil (Fig. 1d).

The oil was extracted by mechanical pressing (200 g of grains per test/heating in greenhouse for 2 h at 105 °C / and pression of 10 tons (412.5 kg cm-2) for 5 min. and with hexane solvent in Soxhlet equipment (200 g per test / crushed and sieved in 100 mesh or 0.149 mm opening / transferred to cartridge extractor/used approximately 700 ml of hexane P.A. (Modern Chemistry) by operation/refluxed for extraction for 4 h/distillation of the mixture (oil + hexane) for separation of the components/use of the rotary evaporator (Fisatom Brazil, mod. 801) at 110 °C for 2 h in thermostatic bath with ethyleneglycol for waste solvent disposal and to remove possible volatile impurities in the crude oil/desolventization at 105 °C in greenhouse for 2 h/cooling in desiccator and weighing).

The cakes (or pies) produced by mechanical pressing were crushed in laboratory blender, sieved (100 mesh) and had their residual oil extracted in similar procedure to the grains. The extracted oils (Fig. 1e) have presented a slightly different odour and colour and were stored in amber bottles to avoid photolytic degradation and in laboratory temperature (around 20 °C) during the analysis. The mixed crude oil (by pressing and by solvent extraction, 1:4 proportion) was degummed (20% of deionized water in relation to the oil/temperature of 60 °C in thermostatically-controlled water bath / 500 rpm for 15 min / centrifugation at 5000 rpm for 15 min), 3 times washed (deionized water / treated oil in 1:1 proportion/ agitation of 1000 rpm for 30 mins. / decantation for 2 h) and dried (heated to 100 °C for 60 min. with intermittent agitation every 5 mins.), and converted in purified oil (Fig. 1f).

2.2 Chromatographic characterisation of the extracted moringa oils

The moringa oil obtained by mechanical pressing was analysed through the conversion of your presents fatty acids in methylic esters (FAMEs) according to Hartman and Lago (1973), adapted to microscale, followed by gas chromatographic analysis with an FID detector.

Afterwards, in a autoclavable tube of 20 ml was weighed approximately 35.0 mg of moringa oil and 3.0 ml of solution 0.5 mol L-1 of sodium hydroxide (Merckr) in dry methanol (Tediar) and heated in water bath for 10 min at 90 °C. The tube was cooled in an ice bath and 9.0 ml was added of the esterification mixture and heated for 10 min. in a water bath at 90 °C. The tube was then cooled in ice bath and 5.0 ml of n-heptane (Tediar) and 2.0 ml of distilled water were added. This mixture was vigorously agitated and left at rest until phase separation. The heptanic phase was collected with a Pasteur pipette and analysed with gas chromatography.

For the analysis of the composition of the FAMEs and to calculate the level of ester, a gas chromatograph Agilent 7890 was used, with an FID detector and split/splitless injector; the capillary column used was the DB-WAX (30 m × 0.25 mm × 0.25 μm). The stove was operated under the initial temperature of 70 °C, being heated at 10 °C/min until 240 °C, and maintained at this temperature for 13 min, and once again heated at 5 °C min-1 until 250 °C. The injector was kept at 310 °C with an injection volume of 2 μl, on split mode, with Hydrogen 5.0 being used as a carrier gas at a linear speed of 42 cm s-1 with Nitrogen 5.0 being used as an auxiliary gas at 20 ml min-1. The FAMEs were identified by direct comparison with samples of known composition such as soybean, peanut and crambe oil, reference FAMEs standards (Nu-Check Prepr) and by analysis via high resolution gas chromatography attached to mass spectrometry (GC-MS) (gas chromatography Shimadzu 17A attached to mass spectrometry QP-5050 Shimadzy, interface at 280 °C, helium 5.0 as carrier gas, linear speed of 42 cm s-1, stove conditions, injector and capillary column at 280 °C).

2.3 Physicochemical characterization of the extracted and purified moringa oils

The oils were characterized through their acidity index, peroxide index, saponification index and iodine value (Physicochemical Methods for Food Analysis of the Adolfo Lutz Institute – IAL, IV Edition, 1st Digital, 2008), specific mass (NBR 14065/ASTM D4063 and NB 7148), kinematic viscosity (NBR 10441/ASTM D445), water content for Karl Fischer (NBR 11348/ASTM D6304), turbidity (standard operational procedure of the turbidimeter HACH 2100N), high power calorific (standard operational procedure of the calorimeter IKA C 200), lower calorific value (calculated based on the high power calorific and water content of the sample) and ash content (NBR 9842 from ABNT).

3 Results and discussion

3.1 Chromatographic parameters of the pressing oil esterified

In the evaluation of the data obtained for methylic esters (FAMEs) of the moringa oil obtained by mechanic pressing and esterified by the Hartman and Lago (1973) method and through the profile of the fatty acids (Fig. 2), comparing to some researches (Abdulkarim et al., 2005; Compaoré et al., 2011; Lalas and Tsaknis, 2002; Rashid et al., 2008; Santana et al., 2010; Tsaknis et al., 1999), an international convergence of these components was observed, prevailing the highest percentage of the unsaturated fatty acids over the saturated, with emphasis to the oleic acid (monounsaturated with 18 carbon atoms and cis configuration, varying between 67.9 and 78.0%).

thumbnail Fig. 2

Chromatogram obtained from the Moringa oleifera oil.

The high level of oleic acid (Tab. 1) in the moringa oil structure provides a good fluidity as well as a low viscosity and makes it less likely in rancidification or oxidative deterioration due to the only double bond of this fatty acid (Pereira, 2015). The study verified a 70.2% of oleic acid and 4.6% of its positional isomer, the vaccenic acid, having a total of 74.8% of monounsaturated C18, matching the data obtained. For the saturated fatty acids, the biographies mentioned data varying from 19.0 to 27.0%, and this study verified 21.5%. Even with distinctive and global proveniences, there was a certain convergence in the fatty profile for the moringa oil, it being adequate for biodiesel production or others applications such as in feed, medicinal or cosmetic.

Table 1

Profile of the fatty acids of the moringa oil by mechanical pressing and esterified.

Table 2

Analytical parameters for the moringa oils investigated.

3.2 Physicochemical parameters of the extracted moringa oils

The parameters chosen (Tab. 2) were with intention to evaluate the degradation or stability of the post-extraction oil, storage and conservation (acidity index, peroxide index and water content) and for the general comparative characteristics of vegetable oils (specific mass, kinematic viscosity, saponification index and iodine value). The turbidity was chosen to evaluate the presence of colloidal impurities interfering, mainly phosphatides and other colloids; the water and ash contents to evaluate the energetic potential of these biomasses for direct or indirect use (Pereira, 2015).

The acidity index measures the presence of free fatty acids (FFAs) generated by effects of the hydrolysis or oxidative and were considered high for crude oils (pressing, by solvent extraction and mixed oil), but the mixed purified (degummed, neutralised, washed and dried) presented acceptable conditions for various uses (Pereira, 2015). Reference studies for the moringa oil presented strong variation of this index, from 0.33 mgKOH g-1 of oil (Pereira et al., (2010, by pressing) until 5.89 mgKOH g-1 of oil (Santana et al., 2010, by solvent), demonstrating that the extractive method by solvent has a negative influence in the quality of the oil, explained by the heating and chemical interactions between the substances (oil and solvent) and confirmed with the results (Tab. 2) obtained in this study of 8.8 mgKOH g-1 for mechanical pressing oil and of 20.5 mgKOH g-1 for the oil extracted by hexane. The conditions of production and storage of the seeds, the expiration date, time of processing and ways of manipulation favour the increase of this index (negative aspect). The mixed moringa crude oil presented 18.1 mgKOH g-1, value much above 4 mgKOH g-1 (crude) or 0.6 mgKOH g-1 (refined oils) indicated by the RDC 270/2005 - ANVISA, acceptable conditions for direct food or cosmetic, or treaty for the biodiesel production. Degumming, neutralisation, washing and drying modified acidity index the oil after the purification for 0.2 mgKOH g-1 of oil (mixed moringa oil purified) (Pereira, 2015).

The peroxide index is associated to the oxidation reactions due to the oxygen’s effect in the double bonds of the fatty acids present in the oil and intrinsically linked to the increase in the acidity index and vice-versa. The values of this study (Tab. 2) were of 3.3, 5.4 and 5.2 meqO2 kg-1 oil, for the moringa oil by mechanical pressing, by extraction solvent and mixed crude oil, respectively, and correlates to the high acidity indexes mentioned earlier. This index was evaluated comparing the crude oils of moringa with the refined soybean oil (0.5 meqO2 kg-1 oil – most used feedstock in Brazil to biodiesel and abundant use in food) and with an acceptable limit for edible crude oils (until 15 meqO2 kg-1 oil) and refined edible oils (until 10 meqO2 kg-1 oil) by the ANVISA Resolution RDC n. 270/2005, for the product acceptability with low oxidative depreciation. The values obtained were above the reference for soybean, but within the acceptable limit for vegetable oils for biodiesel production or food, cosmetic or medicinal use (RDC n. 270/2005). The peroxide index for mixed purified oil was not detected with the methodology used indicating that the processes of degumming, neutralisation, washing and drying removed the contaminants that can cause oxidation (Pereira, 2015).

The water content of the method Karl Fischer (Tab. 2) were of 876.6 mg kg-1 for the moringa crude oil by mechanical pressing, 632.0 mg kg-1 by solvent extraction and 630.2 mg kg-1 for the mixed oil purified. The results for the oil obtained by chemical extraction and for the purified oil were similar, suggesting that using a solvent treatment, neutralising reagents and heating improves the acceptable water levels of the material, though an intrinsic indication in the structure of the fatty material might maintain some residual. The values were below the acceptable for oil feedstock for biodiesel (0.1% maximum humidity or 1,000 mg kg-1) or for other uses (Oliveira et al., 2012). The water present in the oils, even in small quantities, is a negative factor, favouring the hydrolysis reactions, oxidation and microbial degradation (Pereira, 2015).

The specific masses (Tab. 2) for the moringa oil were of 907.2 and 909.5 kg m-3 at 40 °C, for oil by mechanical pressing or by solvent extraction, respectively. The values in the reference studies were between 880.9 kg m-3 (Tsaknis et al., 1999, for solvent extraction) and 909.9 kg m-3 (Pereira et al., 2010, for mechanical pressing) at 40 °C, with a constant tendency of reduction when using extraction by solvent. The specific mass of the purified oil was of 907.0 kg m-3 at 40 °C, remaining within the reference range. The experimental values show that the solvent and treatments used slightly reduce the specific mass of the oil, which can be explained through the removal of impurities scattered presents in the fatty structures of the glycerides (major components) (Pereira, 2015). The specific mass of the moringa crude or purified oil is lower than of the refined soybean oil (913.8 kg m-3, at 40 °C), but are within the average for vegetable oils (Sing and Sing, 2010), with values that vary from 902.6 kg m-3 for peanuts to 940.6 kg m-3 for babassu), but slightly higher than the values found for diesel oil (852 kg m3) or hydrous ethanol (809 kg m3), according to Garcia (2002).

The kinematic viscosity in mm2s-1 at 40 °C, obtained in this study (Tab. 2) and in the references for the moringa oil (crude or purified) is higher than for the refined soybean oil (32.6 mm2 s-1 at 40 °C) used as a standard Brazilian reference for vegetable oil for biodiesel production. The results of the study were: 43.6, 39.1 and 41.7 mm2 s-1 (at 40 °C for crude oil by mechanical pressing, by solvent extraction and mixed purified, respectively), close to the results obtained by Pereira et al. (2010) and Santana et al. (2010): 49.16 and 37.87 mm2 s-1 (at 40 °C), respectively for mechanical pressing and for with hexane extraction. It is important to highlight that the presence of small quantities of residual solvent can influence in the lowest viscosity result when compared to the one of pressing and also by the fact that the solvent removes soluble components in it (Pereira, 2015). Tsaknis et al., (1999), Lalas and Tsaknis (2002) and Rahman et al., (2009), using the extraction oil by hexane of the moringa seeds, obtained results varying from 45 to 57 mm2 s-1 (at 40 °C), within the vegetable oil’s expectations according to Singh and Singh (2010), which found 27.2 mm2/s for the linseed oil and 53.6 mm2 s-1 for the crambe oil, including 32.6 mm2 s-1 for the soybean oil, all measured at 38 °C, well above 3.06 mm2 s-1 obtained for diesel oil at 40 °C (Garcia, 2002). The kinematic viscosity (at 40 °C) of the moringa oil was of 43.6 mm2 s-1 (by mechanical pressing), 39.1 mm2 s-1 (by solvent extraction) and 41.7 mm2 s-1 (for the purified mixed oil), also influenced by solvents and treatments, with small reduction in this parameter. In similar way to the specific mass, the treatments increases this parameter in relation to the one obtained by solvent, and reduces in relation to the one obtained by pressing (Pereira, 2015).

The saponification index can work as a subsidy to calculate the molar masses of the oil by the conversion of constituent acilglycerols (major components) in soaps and dosage by difference, in acid base titration. Roughly speaking, an adulteration in the saponifiable oleaginous can be noticed, as the fatty distribution is usually the same in these materials, within fatty acids with 8 to 26 carbons in chain, with possibility of including saturated or unsaturated ones (Pereira, 2015). The results of the study (Tab. 2) of 180.6 mgKOH g-1 and 179.4 mgKOH g-1 for oil by pressing and by solvent converge to the average found in the references for the moringa oil (176.23 and 179.80 mgKOH g-1, Tsaknis et al., 1999, 181.58 mgKOH g-1, Pereira et al., 2010 and 185.56 mgKOH g-1, Santana et al., 2010) and within the classic interval (between 180 and 200 mgKOH g-1) for oleaginous vegetables or saponifiable animals, such as the soybean oil (190.0 mgKOH g-1 and beef tallow (195 mgKOH g-1) (Campestre, 2015).

The iodine value is used to evaluate the structural characteristic in relation to the unsaturation of the glycerol esters chain of the oil. The results of the study (Tab. 2) were: 68.9 gI2 100 g-1 for pressing oil and 70.7 gI2 100 g-1 for oil by solvent. The results are similar to the ones in the references (66.66 and 66.83 gI2 100 g-1, Tskanis et al., 1999, by pressing and by solvent extraction), (73.66 gI2/100 g, Pereira et al., 2010) by pressing) and (85.71 gI2 100 g, Santana et al., 2010, by extraction solvent). The soybean oil has between 120 and 141 gI2 100 g-1 and beef tallow between 33 and 47 gI2 100 g-1 (Campestre, 2015). The higher this index, the more unsaturated and vulnerable to oxidative degradation the fatty material will be. It is recommended to evaluate the iodine value in the crude oil to avoid interferences of substances or conditions that can change the characteristics and analytical results (Pereira, 2015).

The turbidity, an analytic parameter not very common in studies regarding oleaginous, served to evaluate the changes in appearance of the crude moringa oils during the degumming, neutralization, washing and drying (Pereira, 2015). The results of the study (Tab. 2) were of 64.1 NTU (by mechanical pressing oil), 12.6 NTU (for crude oil by solvent extraction), 18.7 NTU (for the mixed crude oil) and 2.1 NTU (for the mixed purified oil) and show that the chemical interaction with substances (extraction solvent or treatment reagents) promote the substantial reduction of turbidity caused by chemical species with no interest in the final composition of the purified oil, mainly if for biodiesel feedstock use (Pereira, 2015).

The parameters of content of humidity (present water), ash content and higher (HCV) or lower (LCV) calorific value are fundamental in any previous analysis of the possible use of biomass as an energetic source or as renewable fuel (Pereira et al., 2009). The humidity contributes negatively to this calorific value or to the energy stored in fuels. The ashes also contribute negatively when a possible amount of waste that can generate the burning of the biomass studied is considered (Garcia, 2002; Nogueira and Lora, 2003). From the point of view of energy per kg of fuel, the moringa oil can be used for direct burning, for the analysis of the result of the higher calorific values between 39.4 MJ kg-1 for the mixed purified oil and 40.3 MJ kg-1 for the crude pressing oil (Tab. 2), even lower than the 46.65 MJ kg-1 for diesel mineral oil (Garcia, 2002), but with less environmental impact, for being renewable and practically without sulphur. The ash contents (maximum of 5%) and water value (maximum of 20%) (Garcia, 2002; Nogueira and Lora, 2003) were well below the acceptable for biomass fuels, with the moringa oil with 0.09 % and 0.06% for the crude oils and 0.007% for the purified oils (calculated based on water content by the Karl Fischer), while for the ash content were of 0.05%, 0.05% and 0.007%, respectively.

4 Conclusions

The extractive yield of the moringa oil varied by between 11.36% (by pressing) and 36.48% (for hexane extraction), with an average of 23.92%. The chromatographic profile of the fatty acids of the pressing oil was of 21.5% of saturated fatty acids and 78.5% of unsaturated, with predominance of the oleic acid (higher than 70%). The moringa oils present an average calorific power of 37 MJ kg-1 and are considered good renewable fuels in direct burning. The gross moringa oil obtained by pressing shows pleasant sensory characteristics with fruity odor resembling nuts. The sensory appearance of the crude and purified oils is striking, with colours of the soft yellow for the orange. The purified moringa oil (degummed, neutralised, washed and dried) presents physicochemical characteristics interesting, mainly its viscosity (41.7 mm2 s-1 at 40 °C) and acidity index (0.2 mgKOH g-1), with high potential for biodiesel feedstock or other use industrial as in cosmetic, food, medicinal and pharmaceutical. The results of the study wave the moringa as a plant with extraordinary properties, mainly in its oleaginous content and also for being an easily exploitable crop and technologies for their co-products easy to be conducted.

The authors declare that they have no conflict of interest.


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Cite this article as: Francisco S.G. Pereira, Chesque C. Galvão, Valmir F. de Lima, Márcia F.A. da Rocha, Alexandre R.P. Schuler, Valdinete L. da Silva, Nelson M. de Lima Filho. The versatility of the Moringa oleifera oil in sustainable applications. OCL 2016, 23(6) A601.

All Tables

Table 1

Profile of the fatty acids of the moringa oil by mechanical pressing and esterified.

Table 2

Analytical parameters for the moringa oils investigated.

All Figures

thumbnail Fig. 1

Plant and some biomasses obtained from moringa. (a) One of the trees used in the collection (Etepam, Encruzilhada, Recife, Brazil, 2014). (b) seed pods opened and closed (30 to 40 cm/average of 16 seeds per pod). (c) seeds, grains (white) and seed husks. (d) cake (or pie) of the mechanical pressing from the grains (seed without husks). (e) pressing oil (front) and extraction oil with hexane (background). (f) mixed purified oil.

In the text
thumbnail Fig. 2

Chromatogram obtained from the Moringa oleifera oil.

In the text

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