Oil Extraction Yield Research Articles

Optimization of Ultrasound-Assisted Extraction of Spent Coffee Grounds Oil Using Response Surface Methodology

Spent coffee grounds (SCGs) generated in coffee processing for beverages and other products are a very significant organic residue that needs to be properly treated. Waste valorization via oil extraction has the potential to obtain compounds that can be used for producing biodiesel or other high-value products, such as polymers. This work focuses on the ultrasound-assisted extraction of SCG oil using n-hexane as a solvent. Three key process parameters are analyzed: temperature, extraction time, and liquid/solid (L/S) rate of solvent, using a central composite rotatable design (CCRD), an analysis that, to the author’s knowledge, is not yet available in the literature. The data were analyzed using the software StatSoft STATISTICA 13.1 (TIBCO Software Inc., Palo Alto, CA, USA). Results show that all parameters have a statistical influence on the process performance (p < 0.05), being the L/S ratio the most significant, followed by extraction time and temperature. An analysis of variance (ANOVA) showed that the empirical model is a good fit to the experimental data at a 95% confidence level. For the range of conditions considered in this work, the optimal operating conditions for obtaining an oil extraction yield in the range of 12 to 13%wt are a solvent L/S ratio of around 16 mL g−1, for a temperature in the range of 50 to 60 °C, and the longest contact time, limited by the process economics and health and safety issues and also, by the n-hexane boiling temperature.

Effects of different extraction methods on the extraction yield, degradation of bixin and formation of harmful volatile compounds in the extracts from annatto seeds

Annatto is one of the most common natural colorants used in the food industry. However, the degradation of bixin (principle colour component) during the manufacturing and storage of annatto leads to the formation of undesirable volatile compounds which are harmful to human health. The aim of this study was to reduce the amount of undesirable volatile compounds while remain a sufficient extraction yield of bixin in annatto extracts. Bixin from annatto seeds was extracted using soybean oil at 120°C, sodium hydroxide solution at 50°C and acetone with a Soxhlet extractor. The extraction yield and the degradation of bixin in annatto extracts during the extraction processes were investigated and the formation of harmful volatile compounds including toluene and m-xylene in the extracts was analysed using a gas chromatography (GC) system equipped with a flame ionization detector (FID). The extraction with acetone resulted in the highest bixin yield, followed by extraction with sodium hydroxide. Bixin extraction yield of the extraction with soybean oil was the lowest and decreased gradually after 40 mins of the extraction. Losses of bixin by the extractions with acetone and sodium hydroxide were low while the extraction with soybean oil caused significant degradation of bixin. All three methods produced negligible amounts of toluene. However, the concentration of m-xylene in the acetone extracts was very high and remained unchanged during the extraction while sodium hydroxide extract contained a low level of this compound. Thus, the extraction method using sodium hydroxide solution is recommended for recovering pigment from annatto seeds to minimize the risk of harmful volatile compounds in annatto products.

Effect of malaxing time and temperature on rheological properties of 'Hass' avocado pulp and oil yield during oil extraction

Abstract'Hass' is the main avocado cultivar grown worldwide. The extraction yield of avocado oil is dependent on pre‐ and postharvest factors as well as processing and extraction conditions. During a cold extraction process, avocado flesh is ground and then slow mixed or malaxed (≤50°C) to release oil from cells, and to aggregate and coalesce the oil droplets. The influence of malaxing conditions, including time and temperature, on oil yield, changes to cell integrity and oil aggregation in 'Hass' avocado fruit pulp was investigated with electrical impedance spectroscopy, electrical conductivity, light microscopy, and rheological measurements at different times during the avocado harvest season. Cell integrity, measured by electrical resistance and conductivity values, did not change with increasing malaxing temperature, which indicated that malaxing temperature did not assist cellular disruption or oil release during malaxing. Malaxing time and temperature reduced the viscosity, increased the mobility of oil droplets, and reduced the storage modulus (G′) of the pulp tissue. The longer time and higher temperatures during malaxing resulted in more oil droplets coalescing leading to increased aggregation to form larger droplets which were easier to separate during centrifugation. The oil yield increased by ≈130% as the malaxing temperature increased from 30 to 50°C, but the actual yield was also influenced by time of harvest during the season.

Enzyme pretreatment combined with ultrasonic-microwave-assisted surfactant for simultaneous extraction of essential oil and flavonoids from Baeckea frutescens

This work was designed to develop an integrated method of ultrasonic-microwave assisted extraction with enzyme pre-treatment and surfactant aqueous (ES-UME) for the simultaneous extraction of essential oil and flavonoids from Baeckea frutescens. The optimal parameters confirmed by single factor optimization combined with Box-Behnken Design were as follows: Cellulase and Hemicellulase concentration 10% (w/v), Triton X-114 concentration 2% (w/v), extraction time 1.5 h, ultrasonic power 478 W, microwave power 535 W, and liquid/solid ratio 16 mL/g. Under the optimal parameters, the extraction yields of essential oil and main five representative flavonoids epicatechin, rutin, isoquercitrin, myricetin, and quercetin reached 6.38, 0.53, 18.58, 10.72, 1.68, and 2.11 mg/g, respectively. Compositional analysis revealed α-Pinene (16.13%), Linalool (15.00%), 4-Carvomenthenol (10.98%), β-Caryophyllene (6.52%), and α-Terpineol (5.43%) were the most prominent components of essential oil. Furthermore, the essential oil exhibited broad-spectrum antimicrobial activity against 7 tested strains and excellent antioxidant activity through DPPH (2, 2-diphenyl-1-picrylhydrazyl), ABTS (2, 2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid)), and antibacterial assays. Moreover, flavonoids extracts were preconcentrated by 9.70-fold compared with the original extracts using the cloud-point property of surfactants. Overall, the developed method was a potential and desirable alternative that can simultaneously extract volatile and non-volatile bioactive constituents from plant materials in food, healthy, and pharmaceutical industries.

Extraction Methods of Oils and Phytochemicals from Seeds and Their Environmental and Economic Impacts

Over recent years, the food industry has striven to reduce waste, mostly because of rising awareness of the detrimental environmental impacts of food waste. While the edible oils market (mostly represented by soybean oil) is forecasted to reach 632 million tons by 2022, there is increasing interest to produce non-soybean, plant-based oils including, but not limited to, coconut, flaxseed and hemp seed. Expeller pressing and organic solvent extractions are common methods for oil extraction in the food industry. However, these two methods come with some concerns, such as lower yields for expeller pressing and environmental concerns for organic solvents. Meanwhile, supercritical CO2 and enzyme-assisted extractions are recognized as green alternatives, but their practicality and economic feasibility are questioned. Finding the right balance between oil extraction and phytochemical yields and environmental and economic impacts is challenging. This review explores the advantages and disadvantages of various extraction methods from an economic, environmental and practical standpoint. The novelty of this work is how it emphasizes the valorization of seed by-products, as well as the discussion on life cycle, environmental and techno-economic analyses of oil extraction methods.

Biochemical Properties and Nutritional Value of Balanites Aegyptiaca (Laloub) Seed Oil

The main goal of this research was to study the physical and chemical properties of Balanites. Aegyptiaca (laloub) oil. Two kilograms of Balanites aegyptiaca fruit were purchased from local market in Omdurman, Sudan. Fruits were then crushed using a steel hammer and seeds were then obtained. One kilogram of seeds was collected and was then ground using grinding machine ground seeds was then eventually ready for further analysis. The seeds of Balanites aegyptiaca were collected, washed and prepared. The seed oil was extracted using soxhlet apparatus with n-hexane as solvent. The percentage yield of oil extraction was (41.9 %). The results revealed that B. aegyptiaca seed contain considerable percentage of moisture (3.27%), fat (41.9), protein (30.9%), fiber (11.34%), ash (3.55%) and carbohydrate (8.9%). Physicochemical analysis of the seed oil was conducted using standard procedures and the following results were obtained; density (0.9091 g/cm3), viscosity (42.71 %), refractive index (1.4734), iodine value (98.09 g/100g), saponification value (194.33 mg KOH/g) and peroxide value (3.08meq/kg), acid value (0.53 mg KOH/g), free fatty acid value (0.26 %) and un-saponification (3.08). This reveals that Balanites aegyptiaca seed oil could be a rich source of oil for domestic and industrial purposes if richly exploited.

Optimization of lipids extraction from Moringa oleifera seeds for biodiesel feedstock

This paper explore the mechanism of lipid extraction efficiency on Moringa oleifera seeds using Soxhlet extraction method. This present study essential to determine the effect of particle size of the sample, extraction time and type of solvent applied towards the efficiency in extracting the lipids from the material. Soxhlet extraction method utilizing Buchi B118 was use in this study and response surface method was applied to analysed the data and determine the optimum parameter condition to obtain the highest yield of Moringa oil extraction. Moringa oil derived from Moringa oleifera seeds was converted into biodiesel (FAME) via Transesterification process. Conversion of Moringa FAME was observed using three different alcohol oil to molar ratio by based-catalysed. This study shows significant strong correlations between particle size of the sample, extraction time and type of solvent use towards extraction yield. The Response surface analysis shows that 1.3611 mm particle size of sample, 3 hours of extraction time and hexane as extraction solvent was the optimum condition in order to get the highest yield of lipids extract from both Moringa oleifera samples. Authentication extraction based on RSM recommendation showed an average Moringa oil yield of 39.75 % by weight.

Microwave-Assisted Hydrodistillation of Clove (<i>Syzgium aromaticum</i>) Stem Oil: Optimization and Chemical Constituents Analysis

One of the extensively prosperous potential aromatic plants is the clove (Syzgium aromaticum). This is owing to all parts of this plant (bud, stem, and leaves) contain a decent amount of essential oils. The current study focuses on the use of microwave-assisted hydrodistillation (MHD) in extracting clove stem essential oils. This study aims to obtain the best possible combination of operating parameters for a high yield of clove stem oil using response surface methodology. The current study adopted a face-centered central composite design to optimize the MHD operational parameters, including the feed-to-solvent ratio, microwave power, and extraction time. The observed data from the experiments were fitted to a reduced quadratic polynomial equation. The three operational parameters were shown to significantly affect the extraction yield of the clove stem oil (p < 0.05), yet the statistical significance for the interaction between each parameter was considerably weak. Furthermore, the adjusted R2 value measured comparably to the corresponding R2 value with the difference below 0.2, implying a high correlation between experimental and model-predicted data. Thus, this result demonstrates the suitability of the model used in the experiment.

Physicochemical analysis and oil extraction yield of moringa (Moringa oleifera) seed

Moringa oleifera (Moringaceae) is fast growing, drought resistant tropical tree mostly found in Asian countries. Moringa is known as miracle plant due to its numerous health benefits and biological properties. Seeds of M. oleifera contain up to 35-40% of nondrying and pale yellow oil that is being utilized for illuminations because it burns without producing smoke. The current research was aimed to investigate extracted oil percentage and physicochemical characteristics of moringa seed oil. Proximate analysis of moringa seed powder was carried out and resulted that it has moisture 6.64±0.343%, crude protein 30.60±1.105 %, crude fat 24.06±1.520, crude fiber 7.07±0.367, ash 3.61±0.046 and nitrogen free extract 28.00±1.41%.Mineral profiling of moringa seed powder was done and calcium was found in higher amount of 356.67 ±15.53 mg/g than all other minerals. Concentration of magnesium was more prominent followed by calcium which was 285.71± 3.51 mg/g. Moringa oil was extracted by solvent and cold press extraction technique and oil percentage of solvent extracted was 24.06 % as compared to mechanical extracted which was 22.47%. Moringa oil extracted by the solvent extraction showed that it contained 0.026±0.005 % moisture, 184.473±0.567 mgKOH/g saponification value which is greater than the value obtained by the solvent extraction.

Physicochemical analysis and oil extraction yield of moringa (Moringa oleifera) seed

Moringa oleifera (Moringaceae) is fast growing, drought resistant tropical tree mostly found in Asian countries. Moringa is known as miracle plant due to its numerous health benefits and biological properties. Seeds of M. oleifera contain up to 35-40% of nondrying and pale yellow oil that is being utilized for illuminations because it burns without producing smoke. The current research was aimed to investigate extracted oil percentage and physicochemical characteristics of moringa seed oil. Proximate analysis of moringa seed powder was carried out and resulted that it has moisture 6.64±0.343%, crude protein 30.60±1.105 %, crude fat 24.06±1.520, crude fiber 7.07±0.367, ash 3.61±0.046 and nitrogen free extract 28.00±1.41%.Mineral profiling of moringa seed powder was done and calcium was found in higher amount of 356.67 ±15.53 mg/g than all other minerals. Concentration of magnesium was more prominent followed by calcium which was 285.71± 3.51 mg/g. Moringa oil was extracted by solvent and cold press extraction technique and oil percentage of solvent extracted was 24.06 % as compared to mechanical extracted which was 22.47%. Moringa oil extracted by the solvent extraction showed that it contained 0.026±0.005 % moisture, 184.473±0.567 mgKOH/g saponification value which is greater than the value obtained by the solvent extraction.

Optimization of Small Castor Seed (Ricinus Communis) Oil Extraction Yield Using Response Surface Methodology

The process conditions that affect the percentage yield of oil from small castor seed was optimized for maximum extraction. In this study, surface response methodology (RSM) that employed a two-factor, five-level factorial central composite design (CCD) was used. Thirteen (13) experiments with different combinations of reaction time and reaction temperature ranging from 1hr (60mins) to 10hrs (600mins) and 60oC to 100oC respectively were also performed. A quadratic model that is polynomial in nature was obtained to predict the percentage oil yield for the small castor seed. Within the experimental variables range, the optimal conditions were found to be 8.68hrs (520.92mins) and 94.14oC respectively. These values were fitted into the quadratic polynomial model that gave rise to the optimum value of small castor seed oil yield to be 55.76% with a p-value less than 0.05. The coefficient of determination R2 was obtained as 0.9530 representing 95.30% of variation in the original data. Our result also gave an adjusted R2 value of 91.95% and predicted R2 value of 66.59% which indicate that the model explains 67% variation in predicting original observations. The result of this study showed clearly the percentage yield of oil that could be extracted from small seeded varieties of castor seed and the optimum yield value possible at a certain reaction time and temperature. The result also established the reliability of response surface methodology to model and optimize the expression of oil from small seeded varieties of castor seed.

Optimization of oil extraction process from blended sludge and algae for biodiesel production

Abstract Sewage sludge is one of the most polluting wastes that affect the environment, which contains organic and inorganic pollutants released into the surroundings. Using non-renewable energy for the engine also releases large amounts of pollutants results from combustion products was other issues to the environment. The decline of non-renewable energy sources, such as natural gas, fossil fuel, and petroleum made the world increase the production of alternative fuels like waste-derived fuels. Recently, biodiesel production developed from edible oil to cover the depilation of non-renewable energy supply. But it has also become a significant challenge for food security. Therefore, finding other potential opportunities for lipid extraction is crucial. Algae and sludge conversion presented by recent studies seem to be a promising method. The paper presents the extraction and optimization of lipids from blended sludge and algae for biodiesel production. The procedure of the study was a characterization of algal and sludge wastes, the extraction of the lipid component by Soxhlet extraction, and the parameters optimization for maximum oil yield obtain. Temperature, extraction time, and solvents were the basic factor affect oil extraction yield. In the optimization 80 temperature, 6hrs time and hexane solvent results in 61% oil extraction yield which maximum point. Algae and wastewater sludge high potential of lipid and can be substitute edible oil supplies for biodiesel production.

Comparative study on yields and quality parameters of argan oils extracted by conventional and green extraction techniques

Argan oil is most frequently sold as pure oil, which can be directly applied topically due to its cosmetological proprieties or ingested in order to provide several health benefits. It's also commonly mixed into a number of cosmetic products like shampoos, soaps and conditioners. In this study we aimed to improve the argan oil extraction yield and quality parameters by comparing the effects of different extraction technologies. Argan kernel oils were extracted using four methods: mechanical cold press, Soxhlet extraction with n -hexane, supercritical fluid extraction (SFE), and enzyme assisted extraction with three different enzyme solutions cellulase (cellulast), pectinase (Pectinex) and a mixture of carbohydrase enzymes (Viscozyme®). The quality parameters was evaluated by determining the acid, peroxide and iodine values as well as the extinction coefficients K 232 and K 270 as measures of conjugated dienes and trienes, respectively. The results showed that the highest yield (66.37% ± 3.3%) was obtained by enzyme assisted extraction using the carbohydrases enzymes mixture (Viscozyme®), followed by Soxhlet extraction (59.5% ± 3.1%) and pectinase extraction (52.03% ± 3.55%). All argan oils samples obtained by the different methods showed a good oxidation stability, with acid, peroxide and iodine values lower than 0.8 mg/g, 15 meq/kg and 110 g/100 g according to the official argan oil norm, respectively. The results of argan oils quality parameters demonstrated that the enzyme extracted argan oils showed low oxidation, with the following quality parameters: acid values (0.4–0.6 mg/g), iodine values (95–100 g/100 g), dienes ( K 232 < 2), trienes ( K 270 < 0.35), and peroxide values (<1.5 meq/kg). The results proved that the enzyme assisted extraction method can be applied to improve the argan oil yield without affecting the oil quality. The enzyme extraction method may be a great alternative to solvent and cold press extractions for this eco-friendly processing approach.

The Study of Physic Chemical Properties and Preference Level of Instant Porridge Made of Pumpkin and Brown Rice

Pumpkin (Cucurbita moschata D.) is an annual plant from the Cucurbitaceae family. The availability of pumpkins in Indonesia is relatively high. Pumpkin production in Indonesia reaches an average of 21 tons per hectare. Pumpkin has high carotenoid content reaching 160 mg/100 g. Pumpkin comes from the family Cucurbitaceae and the genus Cucurbita. The cultivar (Cucurbita moschata D.), which is common for human consumption, is referred to as pumpkin. Rice is a food ingredient as a source of energy for humans. In addition, rice is also a source of protein, vitamins, and minerals beneficial for human health. Based on the color of rice, there are several types of rice in Indonesia, such as white rice, black rice, glutinous rice, and brown rice. Brown rice is generally consumed without going through the grinding process, but it is only ground into broken rice and the husk is still attached to the endosperm. Both of these materials have the potential to be processed into instant porridge. In order to produce an instant porridge that has physicochemical properties and meets consumers’ preferences, it is necessary to optimize different mixtures and ensure the right drying temperature.The research investigated different mixtures of pumpkin and brown rice at different ratios of 25:75, 50:50, and 75:25. Variations of drying temperatures include 150°C, 160°C, and 170°C. The resulting instant porridge was tested for physical properties; color, water absorption capacity, oil absorption capacity, bulk density, and extraction yield. The instant porridge preference test was based on color, aroma, taste, consistency, and overall preference. The instant porridge mostly preferred by the panelists was analyzed for identifying the chemical properties. The data obtained were tested in a completely randomized design. When the analysis marked a significant difference, the Duncan Multiple Range Test was run at a significance level of 5%. The results showed that instant porridge based on physical, chemical, and preference characteristics was influenced by different mixtures of brown rice and different drying temperatures. Concerning the physical properties, preference was obtained from the treatment of pumpkin and brown rice at a ratio of 50:50 at a temperature of 160°C. The chemical composition of the instant porridge included 5.62% water, 12.37% protein, 3.70% fat, 1.81% ash, 1.361.79 (mg GAE/g) phenolic, 164.36(µg/g) beta carotene and 41.5% RSA antioxidants.

Mixed pretreatment based on pectinase and cellulase accelerates the oil droplet coalescence and oil yield from olive paste

Commercial enzymatic pretreatment is being classically used for enhancing the oil extraction yield in the olive oil industry in China. Nevertheless, the mechanism is not yet clearly defined. The aim was to study the action of pectinase and cellulase for improving the oil yield from the aspects of oil droplets coalescence and rheological properties changes of olive paste during malaxation process. From confocal laser scanning microscopy imaging, the bound oil droplets were released and gradually coalesced into larger droplets, eventually formed a continuous oil phase with enzymatic pretreatment. Furthermore, the mixed enzymatic pretreatment effectively decreased viscosity of the olive pastes and promoted the depolymerization and solubilization of pectic polymers involved in the cell-cell adhesion, thus further enhanced the oil extraction yield from 7.15 % to 11.68 % (w/w). Finally, the mixed enzymatic pretreatment improved the droplet release and coalescence, reduced the viscosity of olive paste, and increased the oil yield.

Effect of Solvents and Extraction Conditions on the Properties of Crude Rice Bran Oil

This research aimed to study the effect of solvents, namely n-hexane and ethanol, on the yield of crude rice bran oil extraction. The effects of extraction temperatures of 50, 60, and 70 ºC and extraction times of 1, 3, 6, 12, and 24 h were investigated. Rice bran composition was determined. It was found that protein, lipid, moisture, fiber, ash, and carbohydrate content were 12.65±0.56, 16.32±0.81, 7.65±0.62, 10.25±0.64, 6.38±0.59, and 46.75 %, respectively. From the results, the rice bran oil yield from n-hexane extraction was significantly higher than ethanol extraction, with p &lt; 0.05. The maximum rice bran oil obtained from n-hexane extraction was 16.23±0.34 %. The highest yield of rice bran oil was obtained from extraction temperature of 60 - 70 ºC for 12 - 24 h. After extraction by the optimum conditions at 60 ºC for 12 h, the rice bran oil was kept for 1, 2, 3, 4, and 8 weeks for investigation of its quality changes. It can be concluded that the optimum conditions for rice bran oil extraction was with using n-hexane as a solvent for extraction at a temperature of 60 ºC for 12 h. Storing oil for 0, 1, 2, 4, and 8 weeks resulted in the increase of free fatty acids (FFA) and peroxide value, whereas iodine value and saponification value were relatively constant. HIGHLIGHTS n-Hexane and ethanol effect the yield of crude rice bran oil extraction The rice bran oil yield from n-hexane extraction was higher than ethanol extraction The optimum conditions for rice bran oil extraction were with using n-hexane as a solvent for extraction at a temperature of 60 ºC for 12 h Storing rice bran oil for 8 weeks resulted in the increase of free fatty acids (FFA) and peroxide value, whereas iodine value and saponification value were relatively constant

Impact of Enzymatic Aqueous Extraction Mango Seed Oil on Physicochemical Properties and Oxidative Stability

The goal of this research was to attempt to evaluate the enzymatic aqueousextraction (EAE) of Mango seed oil compared with standard hexan method. Physicochemical properties and oxidative stability of extracted oil were investigated. So the solvent is safe and does not offer the danger of a lightning strike, the EAE is preferable to solvent extraction procedures. Viscozyme L, Celluclast 1.5 L, Nutrase 0.8L, and Alcalase 2.4l FG enzymes were assayed. The oil extraction yield was improved by using ternary enzyme mixes, although it was still considerably (p0.05) lower than that achieved with hexane . Furthermore, The most common types of enzymes employed for EAE are cellulases, proteases, and pectinases. In comparison to those extracted with hexane, oils extracted using (65:25:10 % from Alcalase : Neutrase : Viscozyme) showed a larger buildup of induction time, indicating improved oxidative stability. As a result, we may visualize future industrialization of EAE techniques and promote them as clean technology using this method. The quantity and quality of the extracted mango seed oils compared to hexane extraction for the above-said variables have been researched.

Aqueous enzymatic extraction of Ricinus communis seeds oil using Viscozyme L

In this study, the extraction of oil from seeds of castor (Ricinus communis) was intended using aqueous enzymatic extraction (AEE). After evaluating several enzymes (cellulase, pectinase, hemicellulase and Viscozyme L), the enzymatic cocktail Viscozyme L gave the best oil extraction yield (64 %) at pH 4 and 50 °C, and it was chosen for the optimization of the extraction process using a response surface methodology and a central composite design. Under optimal conditions (2% of Viscozyme L, 4 h of incubation time, 200 rpm and a solid to liquid ratio of 1:5), an oil yield extraction of 80 % was achieved using AEE. Compared with oil extracted using solvent extraction, AEE produced an oil with a higher acid and iodine values, but a similar fatty acid composition. Additionally, oxidative stability was higher in oil extracted using AEE, so it can be said that in terms of this parameter, AEE produces a higher quality oil compared to the SE. Scanning Electron Micrographs (SEM) imagines showed that Viscozyme L causes a destruction of cell walls and liposome membranes structure of castor seeds, causing the oil release. The results showed that AEE is a no contaminant extraction technology that can be employed in the industrial extraction of oil from castor seed.

Effect of Pulsed Electric Fields (PEF) on Extraction Yield and Stability of Oil Obtained from Dry Pecan Nuts (Carya illinoinensis (Wangenh. K. Koch)).

Pulsed electric fields (PEF) have been reported to increase the total oil extraction yield (OEYTOTAL) of fresh pecan nuts maintaining oil characteristics and increasing phenolic compounds in the remaining by-product. However, there is no information regarding the PEF effect on dry pecan nuts. Dry kernels were pretreated at three specific energy inputs (0.8, 7.8 and 15.0 kJ/kg) and compared against untreated kernels and kernels soaked at 3, 20 and 35 min. OEYTOTAL, kernels microstructure, oil stability (acidity, antioxidant capacity (AC), oil stability index, phytosterols and lipoxygenase activity), along with by-products phenolic compounds (total phenolics (TP), condensed tannins (CT)) and AC were evaluated. Untreated kernels yielded 88.7 ± 3.0%, whereas OEYTOTAL of soaked and PEF-treated kernels were 76.5–83.0 and 79.8–85.0%, respectively. Kernels microstructural analysis evidenced that the 0.8 kJ/kg pretreatment induced oleosomes fusion, while no differences were observed in the stability of extracted oils. PEF applied at 0.8 kJ/kg also increased by-products CT by 27.0–43.5% and AC by 21.8–24.3% compared to soaked and untreated kernels. These results showed that PEF does not improve OEYTOTAL when it is applied to dry pecan nuts, demonstrating that kernelsʹ moisture, oil content and microstructure play an important role in the effectiveness of PEF.

Effect of New Solar-Drying Designs for Chamomile Essential Oil Yield and Its Chemical Constituents in Egypt

Egyptian medicinal and aromatic plants (MAPs) sector suffers from poor drying conditions of the product in terms of quality and safety standards, lack of professional advisory services, in addition to a high undeveloped value chain. Four designs were established in this study and focused on different methods for chamomile drying, the results of the 8/9/2 (B) design of the solar-assisted stack dryer were a masterpiece and promising for drying chamomile plant. The results of volatile oil extraction showed that an increased yield of volatile oil extraction by 30 % compared with traditional drying methods (control). GC-MS analysis indicated the essential oil chemical composition for the new drying method, were found to be the main active compound Bisabolol oxide A which were 54% in 8/9/2 (B) design of the solar- assisted stack dryer compared with the control which was 38.36% in control. The study method was promising and distinctive because it increases the yield of volatile oil extraction, maintains chemical structure compared with the control.