Supercritical fluid extraction of soybean oil from the surface of spiked quartz sand - modelling study

The extraction of soybean oil from the surface of spiked quartz sand using supercritical CO2 was investigated. Sand as solid was used; it is not porous material so the internal diffusion does not exist, all the soluble material is in the surface of the particles. Sovová’s model has been used in order to obtain an analytical solution to develop the required extraction yield curves. The model simplifies when the internal diffusion can be neglected. The external mass transfer coefficient was determined by fitting the theoretical extraction curve to experimental data. According to the external mass transfer coefficient, a new Sherwood correlation was developed in terms of the dimensionless groups: Reynolds and Schmidt number. It was found that this correlation give superior results when compared to experimental data

Optimization of walnut oil production

Walnut is recognized worldwide as a functional health food. In the walnut oil production it is very important to find an appropriate method to recover the oil from seeds. Walnut oil in this study was obtained by pressing the seeds followed by extraction with supercritical CO2. The effects of pressing temperature (70, 85, 100 °C), frequency (20, 30, 40 Hz) and nozzle size (8, 10, 12 mm) in pressing experiments on oil recovery and oil temperature were monitored. The optimal calculated pressing condition within the experimental range of the variables studied was determined. In obtained walnut oil the following parameters were analyzed: peroxide value, free fatty acids, insoluble impurities, moisture content, iodine value, saponification value, p-anisidine value and Totox value. The residual oil from pressed cake obtained at optimal conditions was extracted with CO2 with a goal to extract tocopherols residue from walnut after applied screw press process. Content of tocopherols in walnut oil obtained by pressing and oil extracted by supercritical CO2 were compared

From traditional use to scientific data: Helichrysum italicum

U novije vrijeme kozmetička i farmaceutska industrija posebnu pažnju posvećuju pronalaženju dragocijenih biljaka koje svoju primjenu pronalaze u formulacijama kozmetičkih i farmaceutskih proizvoda. Jedna tako dragocijena biljka je zbog bogatstva biološki aktivnih komponenti i smilje. Dugo je vremena bila potisnuta u zaborav, no u novije vrijeme postaje velika atrakcija u svijetu. U flori Europe se nalazi 25 vrsta roda Helichrysum, dok je na editeranskom podneblju od posebnog značaja vrsta Helichrysumitalicum. U radu je dan taksonomski pregled europskih vrsta smilja. Opisane su morfološke i fiziološke karakteristike smilja, način uzgoja, način berbe te količina prinosa. Najvažniju grupu biljnih pripravaka čine ekstrakti koji se dobivaju primjenom različitih metoda ekstrakcije, počevši od jednostavnih do naprednih tehnika poput ekstrakcije pomoću superkritičnih fluida. Koji će se postupak primijeniti ovisi o vrsti i svojstvu sirovine, primarnoj obrada smilja, kvalitativnom i kvantitativnom sastavu eteričnog ulja, a posebno o njegovoj primjeni što je detaljno opisano u radu.In recent years, cosmetic and pharmaceutical industry special attention give to the valuable plants that can find their application in the formulation of cosmetic and pharmaceutical products. One such precious herb is Immortelle due to its rich biologically active compounds. For a long time this plant has been unfairly neglected, but today we are witnessing the increasing popularity of Immortelle in the world. In the Europe flora there is about of 25 species Helichrysum, while for the Mediterranean area particularly important is type Helichrysum italicum. This paper presents an overview of European taxonomic species of Immortelle. The morphological and physiological characteristics of Immortelle were described, plantation cultivation, harvesting method and extraction yield. The most important group of herbal products make extracts that can be obtained using different extraction methods, ranging from simple to advanced techniques such as supercritical fluid extraction. What procedure will be applied depends on the type of raw materials, processing conditions, qualitative and quantitative composition of the essential oil, and its application as described in detail in this review

Cold Pressing and Supercritical CO2 Extraction of Hemp (Cannabis sativa) Seed Oil

In the past few decades, the Cannabis sativa L. hemp variety has been unfairly neglected because of its similarity to the illegal kind Cannabis indica used as a narcotic. The objective of this study was to evaluate the process of oil extraction from Cannabis sativa seeds by cold pressing, followed by extraction with supercritical CO2. In the pressing experiments, the response surface methodology was conducted in order to study the effects of temperature, frequency, and nozzle size on oil recovery and quality parameters. The optimal condition for obtaining the highest oil recovery (23.34 %) and the best oil quality within the experimental range of the variables studied was at temperature of 60 °C, frequency of 20 Hz, and nozzle of ID 6 mm. The residual oil (10.33 %) in the press cake was extracted totally by supercritical CO2 in a newly designed supercritical fluid extraction system. Oregano essential oil was the most effective in protecting the oil from oxidative deterioration

Supercritical fluid extraction of soybean oil from the surface of spiked quartz sand - modelling study

The extraction of soybean oil from the surface of spiked quartz sand using supercritical CO2 was investigated. Sand as solid was used; it is not porous material so the internal diffusion does not exist, all the soluble material is in the surface of the particles. Sovová’s model has been used in order to obtain an analytical solution to develop the required extraction yield curves. The model simplifies when the internal diffusion can be neglected. The external mass transfer coefficient was determined by fitting the theoretical extraction curve to experimental data. According to the external mass transfer coefficient, a new Sherwood correlation was developed in terms of the dimensionless groups: Reynolds and Schmidt number. It was found that this correlation give superior results when compared to experimental data

Optimization of walnut oil production

Walnut is recognized worldwide as a functional health food. In the walnut oil production it is very important to find an appropriate method to recover the oil from seeds. Walnut oil in this study was obtained by pressing the seeds followed by extraction with supercritical CO2. The effects of pressing temperature (70, 85, 100 °C), frequency (20, 30, 40 Hz) and nozzle size (8, 10, 12 mm) in pressing experiments on oil recovery and oil temperature were monitored. The optimal calculated pressing condition within the experimental range of the variables studied was determined. In obtained walnut oil the following parameters were analyzed: peroxide value, free fatty acids, insoluble impurities, moisture content, iodine value, saponification value, p-anisidine value and Totox value. The residual oil from pressed cake obtained at optimal conditions was extracted with CO2 with a goal to extract tocopherols residue from walnut after applied screw press process. Content of tocopherols in walnut oil obtained by pressing and oil extracted by supercritical CO2 were compared

Recovery of bioactive compounds from walnut ( Juglans regia

In this work, the use of supercritical carbon dioxide, a nontoxic solvent, was proposed to extract bioactive compounds from Juglans regia L. green husk and was compared to other traditional techniques based on solvents such as ethanol, methanol and water. Supercritical CO2 was combined with ethanol as an organic modifier at a rate of 20% of the total flow to achieve greater extraction of polar compounds. The extracts were characterised in terms of extraction yields, antioxidant activity, total polyphenol content, phenolic acids, juglone, volatile organic compounds and antifungal activity. The results showed that the extracts obtained with supercritical CO2 were rich in polyphenols (10750 mg GAE/100 g) and juglone (1192 mg/100 g) and exerted high antioxidant activity and antifungal activity compared with the tested fungi. Walnut green husk is not just a food industry waste but also an important economic source of bioactive compounds that could be used for food active packaging