Microwave Assisted Oil Extraction Research Articles

The Volatile Composition and Antibacterial Activity of Leaves of Chorisia Speciosa

Abstract. In this study, volatile composition of leaves of Chorisia speciosa was studied first time. The oil was extracted by microwave-assisted oil extraction and constituents were separated and characterized by gas chromatography - mass spectrometry. A yield of 0.21% was obtained and a total of 25 constituents were identified. Most dominating constituents were: caryophyllene (32.26 %), bicyclogermacrene (9.88 %), humulene (9.26 %), α-selinene (9.18 %) and β-elemene (8.06 %). The anti-bacterial activity of volatile oil was also evaluated against four pathogenic strains. The oil showed different zones of inhibition against different microbes where strongest activity was found against S. aureus (25 mm), moderate activity (15 mm) against E. coli and no activity against S. typhi (9 mm) at the dose value of 3.64 mg. The observed antibacterial activity was due to the presence of various biologically active major and minor constituents.

Modeling and kinetics of microwave assisted leaching based oil extraction from Bhat

AbstractA polar green solvent based Microwave assisted oil extraction from low oil content source like bhat seed is one of the novel and sustainable approach. The understanding of exact mechanism of mass transfer and hence oil extraction is vital for its industrial scale application. The kinetics of oil extraction and their modeling is carried out in present investigation. The MAE of oil from different size particles (<1, 2, and 4 mm) of bhat seed sample was carried out through isopropanol as solvent. Fick's law based model and two stage (washing and diffusion) extraction based empirical model was fitted to the experimental data. Fick's law shown the best fit to all three particle sizes with R2 .98, .98, and .97, respectively. The diffusion rate was observed to be decreased from 0.54 to 0.26 min−1 with increase in particle size. Empirical model shown that the washing stage was most predominant over diffusion with extraction rate few hundred times the diffusion.Practical ApplicationIn recent years, microwave assisted extraction (MAE) attracts the industrial interest because of various advantages. But, the phenomenon of MAE is considerably different than conventional solvent extraction. The understanding of insight in to the process of mass transfer kinetics taking place during extraction is the key requirement for design and scale‐up of the extraction system. Therefore, the present investigation understands the mass transfer and extraction dynamics taking place at molecular level especially in low oil content source, which will help for large‐scale commercial design of MAE systems.

Optimization of ultrasound and microwave assisted oil extraction from sea buckthorn seeds by response surface methodology

AbstractSea buckthorn (SB) seeds were used as raw material to obtain SB oil using two extraction methods: ultrasound and microwave assisted extraction. The favorable experimental conditions that maximize the extraction efficiency were investigated by applying response surface methodology (RSM). The selected key independent variables were ultrasonic intensity (UI), temperature, and time for ultrasound assisted extraction (UAE) and microwave power, time, and solid/liquid ratio for microwave assisted extraction (MAE). The results obtained for extraction efficiency under optimal conditions are comparable for the two extraction methods (89.2 ± 0.50% for MAE and 87.4 ± 0.44% for UAE). The operation conditions for maximum extraction efficiency were: 13.77 W/cm2 UI, 40 °C temperature, and 10 min extraction time for UAE and 225 W microwave power, 15 ml/ g solid/liquid ratio, and 20 min extraction time for MAE. The extraction kinetics was characterized using a second order model for optimal conditions for UAE and MAE of SB seed oil.Practical applicationsThis article describes two modern methods of sea buckthorn seed oil extraction: ultrasound assisted extraction (UAE) and microwave assisted extraction. Both methods offer many advantages if they are likened with conventional oil extraction. The results illustrated that both methods give comparable values for extraction efficiency, but with an advantage for UAE. The extraction time for UAE is shorter in comparison with MAE (10 min in comparison with 20 min).

Microwave assisted extraction of oil from pongamia pinnata seeds

Extraction of oil from seeds is typically carried out by mechanical oil extraction machine. In this study, oil extraction of pongamia pinnata seeds has been carried out using energy from microwaves. A microwave assisted oil extraction system was developed and oil was successfully extracted. Oil extraction was carried out by microwave powers of 300W, 600W and 900W. It was observed that at 300W, efficiency was low. 900W was efficient upto an extraction time of 8 minutes after which charring was observed. Hence optimum condition was found to be 600W and 14 minutes of extraction time. Obtained oil was subjected to quality testing and was compared with the oil obtained from mechanical method.

Improvement in Oil Extraction from Microalgae/Algae for Biodiesel Production using Microwave Assisted Oil Extraction with Methyl Ester

The prospects of producing carbon-neutral biofuels from microalgae appear bright because of their unique features such as high CO2-sequestering capability and ability to grow in wastewater/seawater/brackish water and high-lipid productivity. Extraction of lipids from microalgae/algae is still considered a challenging process due to the difficulties faced during extraction. The commercial production of microalgae biofuels including biodiesel is still not feasible due to the low biomass concentration and costly downstream processes. This study reports the solvent effectiveness of methyl ester (biodiesel) for microalgal lipid extraction together with microwave irradiation. Two co-solvent systems, BD20 (20% Methyl Ester and 80% Ethanol) and BD40 (40% Methyl Ester and 60% Ethanol) were experimented at time intervals of 5, 10 and 15 min, by Microwave-Assisted Extraction at 100 Watts. Microwave irradiation led to disruption of the algal cell walls which facilitated lipid extraction. Results were compared to another system, Chloroform 33% and Ethanol 67% by Microwave-Assisted Extraction as well as conventional Soxhlet extraction as the control. The results obtained from the experiment shows that BD40 has the highest lipid yield for all time intervals compared to BD20, Chloroform + Ethanol. When compared to the control, all of the samples that were extracted with the microwave had a higher lipid yield than Soxhlet Extraction.

Comparison of Conventional Extraction Under Reflux Conditions and Microwave-Assisted Extraction of Oil from Popcorn

Popcorn offers an environmentally friendly alternative to the commercial synthetic loose-fill packing materials. Popcorn could be used for cushioning purposes if the oil is extracted after the popping process. Conventional and microwave-assisted extraction methods were used for oil extraction from whole and ground, popped and unpopped kernels. Conventional extraction method achieved 68.5% oil recovery from whole popped kernels. Whole unpopped kernels were not efficiently de-oiled with either of the methods. It is recommended to extract the oil from popped kernels; corn varieties with higher starch content and lower oil content should be used.