Influence of the Extraction Method on the Quality and Chemical Composition of Walnut (Juglans regia L.) Oil

Elouafy, Youssef; Yadini, Adil El; Moudden, Hamza El; Harhar, Hicham; Alshahrani, Mohammed; Awadh, Ahmed Abdullah Al; Goh, Khang Wen; Ming, Long Chiau; Bouyahya, Abdelhakim; Tabyaoui, Mohamed

doi:10.3390/molecules27227681

Cited by 17 publications

(14 citation statements)

References 53 publications

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“…This high value might result from the relatively high content of PUFA (39.4% of the sum of all fatty acids), as well as from the extraction method used to obtain the oil. [26] However, very similar values can be found in the literature for grapeseed oil (2.6-3.0 mEq O 2 kg −1 ). [27] In the case of the quality of vegetable oils, the most important factor is the quality of the raw material from which the oil is obtained.…”

Section: Quality Parameters Of L Mutabilis Seeds Oilsupporting

confidence: 81%

“…Particularly important for this determination seems to be the oil extraction procedure. According to Elouafy et al [26] walnut oil obtained by the Soxhlet method was characterized by more than twice as high acidity (1.95% as oleic acid) than cold-pressed oil (0.76%). The determined iodine value, which is a good indicator of the degree of unsaturation of fatty acids in oils, is very similar to the values observed in L. angustifolius seed oil.…”

Section: Quality Parameters Of L Mutabilis Seeds Oilmentioning

confidence: 99%

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Physicochemical Characteristics and Technological Properties of Lupinus mutabilis Oil

Czubiński

Siger

2023

Euro J Lipid Sci & Tech

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The aim of the presented study is to examine the physicochemical parameters of the lipids present in Lupinus mutabilis seed and to compare the results with the available data for other commonly used vegetable oils. The oil quality indexes, oxidative stability index (OSI), and melting characteristics are examined. Andean lupin oil has remarkably high oxidative stability (OSI = 65 h) comparable to high-oleic oils counterparts. Quality parameters meet commonly accepted standards, including peroxide value (3.95 meq O 2 kg −1 ) and p-anisidine value (1.25). The acid number value is 1.85 mg KOH g −1 . The iodine value is 110.27 g/100 g, while the enthalpy required to increase the temperature of the sample from −60 to 80 °C is equal to 57.41 kJ kg −1 . The beginning of the melting event (T onset ) and the phase transition temperature (T peak ) values for L. mutabilis seed oil are −29.46 and −22.63 °C, respectively. The presented results indicate the unusually high oxidative stability of the oil obtained from L. mutabilis seeds, which opens up a whole spectrum of application possibilities, e.g., designing blends with other commonly used vegetable oils to enhance their low stability. Practical Applications: The presented results provide insight into physicochemical parameters of the lipid fraction isolated from Lupinus mutabilis seeds. Andean lupin oil has very high oxidative stability, comparable to high-oleic rapeseed and sunflower oils. Therefore, the identified potential use of the studied oils is, e.g. an additive that can increase the stability of commercial vegetable oils characterized by much lower oxidative stability.

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Section: Quality Parameters Of L Mutabilis Seeds Oilsupporting

confidence: 81%

Section: Quality Parameters Of L Mutabilis Seeds Oilmentioning

confidence: 99%

Physicochemical Characteristics and Technological Properties of Lupinus mutabilis Oil

Czubiński

Siger

2023

Euro J Lipid Sci & Tech

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“…The emergence of resistant and biofilm-forming bacteria makes finding new antibacterial strategies an urgent need [38,39] . Essential oils contain many compounds mixed together and could be a promising alternative strategy in front of emerging resistance bacterial infection [40][41][42] . In this study, we verified the antibacterial activity of T. syriacus essential oil extracted from the peripheral region of Damascus against resistant bacteria clinically isolated.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of antibiofilm activity of Thymus syriacus essential oil against clinically isolated MDR bacteria

Battah¹,

Rajab²,

Shbibe³

et al. 2022

Prog Micobes Mol Biol

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Finding alternative strategies to confront bacterial resistance is an urgent need. Biofilm-forming bacteria have become a serious problem in medicine and industry. Bacteria can use biofilm as a mechanism of resistance against antibacterial drugs and avoid the immune system. The aim of this study was to evaluate the antibacterial activity of Thymus syriacus (T. syriacus) essential oil in a solid and liquid medium and to study its antibiofilm formation activity. The T. syriacus essential oil was extracted from the aerial parts of the plants. The minimum inhibitory concentrations (MIC) measurements were used to identify the antibacterial activity of the essential oil against multidrug-resistant strains Pseudomonas aeruginosa (P. aeruginosa), Klebsiella pneumonia (K. pneumonia), Streptococcus pneumonia (S. pneumonia) isolated clinically from blood infections. The microtiter plate was used in order to quantify biofilm formation by bacteria. The minimum inhibitory concentration (MIC) against the three clinically isolated strains (P. aeruginosa, K. pneumonia, S. pneumonia) were (3.12, 1.56, 3.12 µL/mL) respectively. The formation of biofilm by (P. aeruginosa, K. pneumonia, S. pneumonia) was reduced up to (43%, 50%, 60%) respectively, when the essential oil was applied at MIC concentrations for each strain. The observed antibacterial activity of T. syriacus essential oil was significant against antibacterial-resistant strains and antibiofilm formation activity was identified. The novelty of this study is we confirmed that the essential oil of T. syriacus exhibited not just antibacterial properties but also antibiofilm formation effect. More studies are needed in order to continue studying this oil and evaluate its other medicinal properties and toxicity.

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“…In fact, walnuts (Juglans regia) are a great source of unsaturated fatty acids [23][24][25] , fiber, minerals (potassium, calcium, and magnesium) [26,27] , amino acids and proteins [28,29] , phenolic compounds and saponins [30][31][32] , as well as a variety of other compounds that make J. regia has a vast diversity of medicinal properties [33] . In addition, the phytochemicals present in plants like J. regia have been shown to have therapeutic effects, including anticancer, anti-inflammatory, and anti-bacterial properties [34] .…”

Section: Introductionmentioning

confidence: 99%

Bioactivity of Walnut: Investigating the Triterpenoid Saponin Extracts of Juglans regia Kernels for Antioxidant, Anti-diabetic, and Antimicrobial Properties

Elouafy¹,

Mortada²,

Yadini³

et al. 2023

Prog Micobes Mol Biol

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The increasing demand for plant-based medicines makes plant research attractive to find natural alternatives that can replace synthetic products or at least reduce their use. Saponins are a group of natural phytochemical compounds in most herbs, vegetables, and legumes. There are two different types of saponin compounds, which can be classified based on the nature of the aglycone bound to the oligosaccharide fragments, whether it is a steroid or triterpenoid. This paper is devoted to saponins with triterpenoid aglycone and aims to study the relationship between their content and several biological activities in different Juglans regia kernel extracts, including antioxidant, antimicrobial and antibacterial activities. Antioxidant activity was assessed against two free radicals: DPPH and ABTS. Oleanolic acid was used as a standard to quantify triterpenoid saponins, measured by the vanillin method, whereas Acarbose and Tetracycline were used as positive controls to evaluate the α-glucosidase inhibitory and antimicrobial activities, respectively, of walnut kernel extracts. Findings show that hydroalcoholic extract (EtOH 70%) has a considerable content of phenolic compounds, with 59.51 ± 0.26 mg GAE/g in total polyphenol contents, while the content of total flavonoids and condensed tannins were 3.14 ± 0.27 mg QE/g and 85.65 ± 0.37 mg CE/g of crude extract, respectively. In terms of antioxidant activity, the butanolic extract proved to be the most effective against DPPH with IC50 = 7.74 ± 1.49 µg/mL, while the precipitated extract showed the highest scavenging activity against the ABTS free radical with IC50 = 33.14 ± 2.96 µg/mL. In addition, butanolic and hydroalcoholic extracts of Juglans regia kernels showed an α-glucosidase inhibitory activity even more efficiently than synthetic drugs such as Acarbose, with IC50 values of 11.66 µg/mL and 16.17 µg/mL, respectively, versus 18.01 µg/mL in Acarbose. The evaluation of the antimicrobial activity against Bacillus subtilis, Escherichia coli and Klebsiella pneumonia strains revealed that some extracts could inhibit these bacteria. This study successfully assessed the bioactivities of the extracts, suggesting that the extracts of medicinal plants can demonstrate stronger bioactivity than pure synthetic compounds.

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Influence of the Extraction Method on the Quality and Chemical Composition of Walnut (Juglans regia L.) Oil

Cited by 17 publications

References 53 publications

Physicochemical Characteristics and Technological Properties of Lupinus mutabilis Oil

Physicochemical Characteristics and Technological Properties of Lupinus mutabilis Oil

Evaluation of antibiofilm activity of Thymus syriacus essential oil against clinically isolated MDR bacteria

Bioactivity of Walnut: Investigating the Triterpenoid Saponin Extracts of Juglans regia Kernels for Antioxidant, Anti-diabetic, and Antimicrobial Properties

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