Evaluation of Quality of Chia (Salvia hispanica), Sesame (Sesamum indicum), and Quinoa (Chenopodium quinoa) Oils

Abstract

Each year, the consumption of vegetable oils increases gradually. Some oils, such as chia, sesame, and quinoa, are consumed due to the nutritional properties and health promoters that have been recognized in their components. Based on this premise, the present study aimed to characterize chia (Salvia hispanica), sesame (Sesamum inducum), and quinoa (Chenopodium quinoa) oils, in order to enable their applications in the development of new food products. Chia oil presented higher degradation, as it stood out with higher amounts of free fatty acids (4.46%) and peroxide value (18.35 meq/kg). It is an oil that is rich in polyunsaturated fatty acids (75.47%), and, consequently, with high refractive index (1,475) and iodine value (192.86 g/100 g). Quinoa oil stood out for its higher oxidative stability (17.55 h) and higher amount of phenolic compounds (190.84 mg/100 g). Sesame and quinoa oils showed no significant difference for carotenoids, but sesame oil had higher content of total tocopherols (656.50 mg/kg). Thus, the oils can be used in technological processes and/ or in the formulation of new food products, in order to their increase the nutritional value.

Keywords:
special oils; physicochemical properties; bioactive compounds

INTRODUCTION

Oils play a key role in human nutrition, act as a vehicle for fat-soluble vitamins, provide energy[¹], impart nutritional value, taste, texture, aroma, and palatability to food, act as a heat transfer medium during the frying process, and provide consistency and specific fusion characteristics to the products containing them [²]. Oils are products obtained from vegetable species consisting of approximately 95% triacylglycerols and 2-5% non-glyceride compounds (phospholipids, carbohydrate traces, methyl ketones, free fatty, acids and fatty acid degradation products). In the unsaponifiable fraction, there are substances beneficial to the organism, such as tocopherols, phenolic compounds, phytosterols, and carotenoids, called bioactive compounds [³].

The taste, nutritional value and physicochemical properties of vegetable oils depend not only on the raw material, but also on the extraction method [⁴]. The most commonly used extraction methods are solvent extraction or cold pressing. During solvent extraction, essential nutrients and bioactive compounds are degraded, as there is interference of temperature. It is, however, an efficient method [⁵]. On the other hand, cold pressing is a fast, easy, and inexpensive method in which oils retain high levels of bioactive phytochemicals, especially antioxidants, which can add greater nutritional value to processed foods [⁶]. Studies have shown that some components of the oils extracted by cold pressing reinforce the immune system and suppress anti-inflammatory disorders [⁷].

As consumers are increasingly aware of the relation between diet, health, and wellness resulting from choices in foods that are considered healthier and more nutritious, it is important to study special oils, due to the nutritional properties and health promoters that have been recognized in some of their components [⁸]. In this context, the evaluation of chia, sesame, and quinoa oils, obtained by cold pressing, becomes important, in order to make feasible their use in the development of new food products.

MATERIAL AND METHODS

Oils

Chia, sesame, and quinoa oils were supplied by industries located in the South (Panambi, Rio Grande do Sul) and Southeast (São Paulo, São Paulo) regions of Brazil, and stored at -18 ºC. The grains used in the process were produced by the company itself or in conjunction with committed producers, and the oils were obtained by cold pressing.

Physicochemical properties

Standard AOCS methods [⁹] were used to free fatty acids, peroxide value, conjugated dienoic acid, saponification, iodine value, and refractive index. Oxidative stability was performed on Rancimat (model 743, Metrohm Ltd., Herisau, Switzerland) at 110 °C and 20 L/h air flow, and the induction period expressed in hours, according to AOCS [⁹].

For fatty acid composition analysis, first the oils were esterifited, using methanolic KOH following the AOCS [⁹] method. The samples were injected into a gas chromatography (model 3900, Varian, Walnut Creek, CA, USA) equipped with a flame ionization detector, split injection system and capillary column (CP-Sil 88, Microsorb, 50 m x 0.25 mm, film thickness: 0.25 mm internal diameter) were used. Column temperature was set as 90 °C for 10 min, followed by an increment of 10°C/min. until reached 195 °C where it was held for 16 min. The temperatures used in the injector and detector were 230 and 250 °C, respectively. The carrier gas was hydrogen with linear velocity of 30 mL/min. The identification of fatty acid methyl esters was done through the comparison of the retention time for samples and purity standards between 99.1 and 99.9% (Supelco, Bellefonte, USA), and the results were expressed in %. The composition of triacylglycerols was obtained by random distribution using a computer program based on the fatty acid profile [¹⁰].

Carotenoid quantification was performed using a scanning spectrophotometer (model UV-VIS mini 1240, Shimadzu, Chiyoda-ku, Tokyo, Japan), with a wavelength range of 300 to 550 nm, according to the method proposed by Rodriguez-Amaya [¹¹], and expressed in μg/g.

The total phenolic content were extracted according to the method proposed by Parry and coauthors [¹²] and quantified with Spectrophotometer (UV-VIS mini 1240, Shimadzu, Chiyoda-ku, Tokyo, Japan), using Folin-Ciocalteu reagent as described by Singleton and Rossi [¹³]. Gallic acid standard curve was construted (R2 = 0.9999), and used to evaluated the total phenolics, with were expressed as mg EAG/kg.

The tocopherol contents were performed using high performance liquid chromatography by the AOCS method [⁹]. A high-performance liquid chromatograph (model 210-263, Varian Inc., Walnut Creek, CA, USA), equipped with a fluorescence detector the mobile phase was composed of n-hexane: isopropyl alcohol (99.5: 0.5 v/v) and 1.2 mL/min flow. The quantification of each ibsomer was performed by external standardization based on peak areas using α-, β-, γ- and δ-tocopherol standards (Supelco, Bellefonte, Pennsylvania, USA) and expressed as mg/kg of oil.

Statistical analysis

The obtained data were analyzed using analysis of variance and the differences between the averages were tested at 5% probability by Tukey test [¹⁴], through the ESTAT program, version 2.0.

RESULTS AND DISCUSSION

Chia oil presented higher quantities of free fatty acids (4.46%) and peroxide (18.35 meq/kg) value. These values are higher than the limits established by the Codex Alimentarius Commission[¹⁵] for cold pressed oils (Table 1). The hydrolytic and oxidative degradations of chia oil may be due to high the content of unsaturated fatty acids, mainly linolenic[¹⁶]. Besides that, chia seeds have a high amount of soluble fibers, which help stabilize the structure of food products, such as dispersions and emulsions through gel formation or continuous phase thickening, causing great water retention capacity, and, consequently, higher humidity[¹⁷].

Table 1
Physicochemical properties of oils.

Determinations	Chia	Sesame	Quinoa	Codex15
Free fatty acids (% oleic)	4.46 ± 0.02a	1.73 ± 0.03b	0.57 ± 0.01c	Max. 2
Peroxide value (meq/kg)	18.35 ± 1.63a	13.05 ± 0.69b	2.71 ± 0.11c	Max. 15
Conjugated dienoic acids (%)	0.32 ± 0.00b	0.37 ± 0.00a	0.22 ± 0.01c	-
Refractive index (40°C)	1.475 ± 0.05a	1.468 ± 0.029c	1.470 ± 0.05b	*
Iodine value (g/100 g)	192.86 ± 0.01a	112.27 ± 0.05b	98.87 ± 0.01c	*
Saponification value (mg/g)	193.87 ± 0.02a	192.03 ± 0.01b	191.55 ± 0.03c	*
Oxidative stability (h)**	0.50 ± 0.04c	3.89 ± 0.02b	17.55 ± 0.04a	-

• Means ± standard deviations of the analyzes followed by the same letters in the lines do not differ by the Tukey test (p> 0.05). *Its depends on the oil. **Performed on Rancimat (model 743, Metrohm Ltd., Herisau, Switzerland) at 110°C and 20 L/h air flow

The amount of conjugated dienoic acids is proportional to the absorption of oxygen and the formation of peroxides during the initial stages of oxidation[¹⁸]. Therefore, it can be inferred that sesame oil obtained higher absorption, since it presented 0.37%

Chia oil presented higher refractive index (1.475) and iodine value (192.86 g/100 g), which may be related to the concentration of polyunsaturated fatty acids, particularly linolenic and linoleic acids. Timilsena and coauthors [¹⁹] and Ixtaina and coauthors [²⁰], when analyzing the physicochemical properties of chia oil, obtained higher iodine values, 208.5-209.4 and 204 g/100 g, respectively. These authors came to the conclusion that just as the refractive index, the iodine value is related to the concentrations of polyunsaturated fatty acids, such as linolenic and linoleic. Different results can occur due to the different varieties, the processing and types of thermal treatments to which the oils were subjected.

Chia oil presented higher saponification value (193.87 mg KOH/g). Thus, it can be inferred that this oil is composed of larger amounts of short chain fatty acids, corroborating with Ixtaina and coauthors [²⁰] when characterizing the chia oil extracted by different methods. The oxidative stability of the oils during and after processing is one of the most important characteristics, both in technological and nutritional aspects, since it can be influenced by the composition of fatty acids and the presence of natural antioxidant compounds [²¹]. Quinoa oil showed the highest oxidative stability (17.55 h), while chia oil showed only 0.55 h. This difference is due to the presence of natural antioxidant compounds in quinoa oil and the polyunsaturated fatty acid composition of chia oil.

When analyzing the fatty acid profile (Table 2), it was observed that among the saturated fatty acids, palmitic acid stood out in higher quantities in chia (6.18%), and sesame (7.14%) oils, while stearic acid stood out in quinoa oil with 5.6%.

Table 2
Profile fatty acids of oils.

Fatty acids (%)	Chia	Sesame	Quinoa
Palmític (C16:0)	6.18 ± 0.02b	7.14 ± 0.02a	3.57 ± 0.02c
Stearic (C18:0)	3.82 ± 0.02c	5.30 ± 0.03b	5.60 ± 0.02a
Oleic (C18:1n9c)	13.88 ± 0.01c	60.19 ± 0.02a	51.11 ± 0.01b
Linoleic (C18:2n6c)	18.66 ± 0.02c	26.68 ± 0.03b	39.3 ± 0.02a
Linolenic (C18:3n3c)	56.81 ± 0.01a	0.35 ± 0.01b	0.10 ± 0.01c
Arachidonic (C20:0)	0.67 ± 0.01a	0.36 ± 0.01b	0.34 ± 0.01b
Saturated	10.66 ± 0.01b	12.79 ± 0.01a	9.50 ± 0.01c
Monounsaturated	13.88 ± 0.01c	60.19 ± 0.02a	51.11 ± 0.01b
Polyunsaturated	75.47 ± 0.01a	27.03 ± 0.04c	39.40 ± 0.01b

• Means ± standard deviations of the analyzes followed by the same letters in the lines do not differ by the Tukey test (p> 0.05).

Sesame oil obtained the highest amount of oleic acid (60.19%), results highter than found by Ozcan and coauthors [²²] and Mohammed and coauthors [²³]. According to Zheljazkov and coauthors [²⁴], the oils can be classified in relation to the amount of oleic fatty acid, as traditional (14-39%), mid oleic (42-72%) and high oleic (75-91%). Thus, sesame and quinoa oils may be considered mid oleic. From the nutritional point of view it is very important, since there is evidence that this fatty acid can maximize the levels of the high density lipoprotein cholesterol fraction[²⁵].

In relation to polyunsaturated fatty acids, chia stood out with higher content of linolenic acid (56.81%). When evaluating the fatty acid composition of chia oils, Bodoira and coauthors [²⁶] and Ozcan and coauthors [²⁷] obtained values very close to those found in this study. Although the fatty acid composition of this oil is favorable from the nutritional point of view, it presents a great technological disadvantage due to its low oxidative stability[²⁸].

Differences observed in fatty acid composition of oils can be attributed to several factors such as the variation in climatic conditions, cultivation locations, agronomic practices, and genetic backgrounds of seeds, as well as esterification and analysis methods[²⁷].

Based on the fatty acids, the triacylglycerols profile was obtained, as shown in Table 3. Chia oil is the only one with triacylglycerols composed of linolenic acid (Al), with higher amounts of AlAlAl (19.1%) and LAlAl (18.7%). Ixtaina and coauthors [²⁰], characterizing chia oil extracted by different methods, also found high amounts of these two triacylglycerols. On the other hand POS, POO, SOO and OOO triacylglycerols are present only in sesame and quinoa oils, possibly due to high percentage of oleic acid.

Table 3
Profile triacylglycerols of oils.

Triacylglycerols (%)	Chia	Sesame	Quinoa
POS (C52:1)	-	1.4	0.6
POO (C52:2)	-	7.9	2.9
PLO (C52:3)	1.0	7.1	4.5
PLL (C52:4)	0.7	1.6	1.7
PAIO (C52:4)	3.1	-	-
PAIL (C52:5)	4.1	-	-
PAlAl (C52:6)	6.2	-	-
SOO (C54:2)	-	5.9	4.5
SLO (C54:3)	0.6	5.3	6.9
OOO (C54:3)	-	22.5	13.7
OLO (C54:4)	1.1	29.9	31.7
OLL (C54:5)	1.5	13.3	24.4
SAIL (C54:5)	2.5	-	-
OAIO (C54:5)	3.4	-	-
LLL (C54:6)	0.7	1.9	6.3
SAlAl (C54:6)	3.8	-	-
OAlL (C54:6)	9.2	-	-
LAIL (C54:7)	6.2	-	-
OAlAl (C54:7)	14.0	-	-
LAlAl (C54:8)	18.7	-	-
AlAlAl (C54:9)	19.1	-	-
Others	4.1	3.2	2.7

• P (palmític), O (oleic), L (linoleic), S (Stearic), and AI (linolenic).

Table 4 shows that chia oil presents a lower amount of total carotenoids (5.03 μg β-carotene/g) than the others. Ixtaina and coauthors [²⁰], when characterizing chia oils found lower contents (0.58-1.21 μg β-carotene/g), whereas, Bodoira and coauthors [²⁶], when evaluating the stability of chia oil and the effect of natural antioxidants, obtained levels, 5.41 μg β-carotene/g close, to those found in this study. The authors further reported that, when considering the fatty acid composition of chia oil, it can be understood that the contents of carotenoids presented do not have sufficient antioxidant action to provide protection against photooxidative degradation.

Regarding phenolic compounds, quinoa oil presented high amount (190.84 mg/kg). However, Multari and coauthors [²⁹] evaluated the effect of different drying temperatures on quinoa grains and found 293-994 mg/kg of phenolic compounds, showing that temperatures of 60 and 70 °C facilitated their extraction.

The divergence of values between phenolic compounds can be attributed to several factors, such as the binding of polyphenols to other substances, changes in the chemical structure of polyphenols that could not be determined by the available methods, the reactivity of Folin-Ciocalteu reagent with other compounds. and in the oil extraction method[³⁰]. Ozcan and coauthors [³¹] found that there is a greater amount of phenolic compounds in oil extracted by the Soxhlet method compared to the cold press, suggesting the potential enhancer of the Soxhlet method in the phenolic profile of chia oil.

Table 4
Bioactive compounds of oils.

Determinations	Chia	Sesame	Quinoa
Carotenoids (μg β-carotene/g)	5.03 ± 0.13b	19.46 ± 0.13a	17.39 ± 0.94a
Phenolic compounds (mg/kg)	131.10 ± 4.09b	88.73 ± 4.47c	190.84 ± 5.21a
Tocopherols (mg/kg)
α-tocol	13.30 ± 0.06c	216.38 ± 0.14a	26.51 ± 0.03b
γ-tocol	88.61 ± 0.04c	440.12 ± 0.10a	213.07 ± 0.11b
δ-tocol	nd	nd	103.90 ± 0.14
Totals	101.91 ± 0.01c	656.50 ± 0.24a	343.48 ± 0.28b

• Means ± standard deviations of the analyzes followed by the same letters in the lines do not differ by the Tukey test (p> 0.05). nd: not detected (limits of detection: α-tocol ≤ 3.15 mg/kg, γ-tocol ≤ 8.65 mg/kg, δ-tocol ≤ 2.30 mg/kg).

The importance of tocopherols present in vegetable oils is related to their antioxidant properties in animal and vegetable tissues and physiological functions [³²]. Chia oil presented the lowest levels of α-tocopherol (13.3 mg/kg) and γ-tocopherol (88.61 mg/kg), showing that it is not technologically stable. In the sesame oil, higher amount of total tocopherols was found γ-tocopherol having stood out with 67% of this total. Therefore, this oil can be considered a good source of tocopherols.

Only in quinoa oil was δ-tocopherol found and in a quantity (103.90 mg/kg) higher than what found by Przygada and Wejnerowska[³³] when studying quinoa oil extracted by supercritical fluid with different combinations of temperature, pressure and time. This tocopherol isomer has high antioxidant capacity, which, when correlated to the fatty acid profile, can impart high oxidative stability to the oil [³⁴].

CONCLUSION

The physicochemical properties of the oils, especially the low values of free fatty acids, peroxides and dienoic acids, showed that quinoa oil has better quality than the others, besides high oxidative stability, since it is a mid oleic oil and presents δ-tocopherol, which has high antioxidant potential. In contrast, sesame oil had higher amounts of monounsaturated fatty acids, carotenoids and total tocopherols. In conclusion, the oils studied have potential use in the formulation of new products, to enrich them nutritionally, or to be mixed with others that contain low levels of bioactive compounds, thus increasing health benefits.

Acknowledgments

The authors would like to thank the National Council of Scientific and Technological Development (CNPq), for sponsoring the productivity and the Coordination of Improvement of Higher Education Personnel (CAPES), for sponsoring the research

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HIGHLIGHTS

• 1
  Chia oil showed the greatest degradation.
• 2
  Sesame oils stood out for the highest of monounsaturated fatty acids, and bioactive compounds
• 3
  The oils studied have potential use in the formulation of new products

• Funding:

  This research received no external funding.

Publication Dates

• Publication in this collection
  15 May 2020
• Date of issue
  2020

History

• Received
  03 June 2019
• Accepted
  07 Feb 2020