Chemical composition and antioxidant activity of the coriander cake obtained by extrusion

This study was designed to examine the effect of operating conditions on essential oil composition and antioxidant activity of coriander cakes. Twenty-nine components were determined in essential oils, which were mostly alcohol monoterpenes. The highest essential oil yields (0.11%) were obtained by the nozzle diameter of 5 mm. The main components of cake essential oil linalool, gamma-terpinene, geranyl acetate, linalyl acetate and camphor showed significant variations with different nozzle diameter. The total phenol contents and condensed flavonoid contents varied between different nozzle diameters; the highest values obtained of small diameters (5 and 6 mm). Significant differences were also found in total tannin contents among different nozzle diameters. The total phenol contents decreased significantly (p < 0.05) when increased the nozzle diameter to 9 mm and reached 9.11 mg GAE/g. The screening of antioxidant activity of the different coriander cakes using the di(phenyl)-(2,4,6-trinitrophenyl) iminoazanium radical (DPPH) assay showed an appreciable reduction of the stable radical DPPH, although small nozzle diameter was the most efficient method with an IC50 reached of 55 mu g/ml as compared with bigger diameter (IC50 = 88 mu g/ml). All the extracts had lower beta-carotene bleaching activity than that of synthetic antioxidant BHA and BHT. Coriander cake extracts presented a very low reducing power ability (EC50 approximate to 700 mu g/ml) compared to ascorbic acid (EC50= 40 mu g/ml)

Biochemical Characterization of Coriander Cakes Obtained by Extrusion

This study was designed to examine the effect of operating conditions such as nozzle diameter on fatty acid, sterol, and tocol composition of coriander cakes. Eight fatty acids were identified, with petroselinic acid accounting for 75-77% of the total fatty acids, followed by linoleic, oleic, and palmitic acids, accounting for 12-13%, 5% and 3%, respectively, of the total fatty acids. beta-Sitosterol was the major sterol in all oils with 33-35% of total sterols. The next major sterols in all oils were stigmasterol (24% of total sterols) and Delta(7)-stigmasterol (15% of total sterols). Coriander cake contained higher amounts of total tocotrienol where gamma-tocotrienol was the main compund

Coupled extruder-headspace, a new method for analysis of the essential oil components of Coriandrum sativum fruits

A new method involving concurrent single screw extruder combined with continuous headspace dynamic for the extraction and identification of the essential oil of Coriandrum sativum L fruit was developed. The effect of six different nozzle diameters (5, 6, 7, 8, 9 and 10 mm) on the content and chemical composition of the essential oil of coriander fruit was studied. The oils from fruit samples were obtained by OMEGA 20 extruder. The result showed that the highest yield (0.53%) was obtained by the diameter of the nozzle was 8 mm. Twenty-nine components were determined in essential oils, which were mostly hydrocarbons and alcohol monoterpenes. The main components linalool, alpha-pinene, gamma-terpinene, p-cymene and limonene showed significant variations with drying trials

Extraction of coriander oil by twin-screw extruder: Screw configuration and operating conditions effect

International audienceA new process, in which coriander fruits are pressed in a co-rotating twin-screw extruder, is examined here. Six tests were examined to define the best performance (oil extraction yield, and oil quality) by studying the influence of operating conditions, screw speed and flow rate. The screw speed and flow rate affected oil extraction yield. An increase of oil extraction yield was observed as the screw speed was increased (100 rpm) with a decreased flow rate of fruit (2.27 kg/g). Highest oil extraction yield was obtained under operating conditions of 50 rpm and 2.27 kg/h. Effect of the operating parameters on fatty acid composition was less important. Ten fatty acids were identified, with petroselinic acid accounting for 66-75%, followed by linoleic, oleic and palmitic acids, accounting for 13-19%, 5-7% and 4-5%, respectively, of the total fatty acids. beta-Sitosterol was the major sterol in all oils with 31% of total sterols

Lipid, fatty acid and tocol distribution of coriander fruit's different parts

International audienceHigh amounts of neutral lipids (NL) were found (95.65% of total lipids) in whole fruit oil, while glycolipids (GLs) occurred at high levels in pericarp oil (73.21% of total lipids). Triacylglycerol was found to be the principal lipid fraction of NL which formed 93% in seed and whole fruit. However, monoacylglycerol constituted the major fraction of NL in pericarp (34.5%). At least two GLs and five phospholipids (PL) were identified. The CL composition of the pericarp is characterized by monogalactosylacylglycerol as the major fraction with a percentage of 53.39% of total lipids. The major individual PL subclasses were phosphaticlylcholine followed by phosphaticlylethanolamine in seed and whole fruit. However, the PL were not detected in pericarp, oil. The principal fatty acids identified in most lipid classes were petroselinic acid (C18:1n-12), linoleic acid (C18:2n-6), palmitic (C16:0) and oleic acid (C18:1n-9). The total tocopherol and tocotrienol (tocol) contents were 27.78 mg/100 g oil in whole fruit, 26.42 mg/100g oil in seed and 5.36mg/100g oil in pericarp. Fruit and seed oils were characterized by a high amount of gamma-tocotrienol with 19.56 mg/100 g oil. However, a-tocopherol (1.82 mg/100g oil) was found to be the tocol marker in pericarp oils. The results are important as an indication of the potentially economical utility of Coriandrum sativum L. seed oil as a new source of PL. (C) 2009 Published by Elsevier B.V

Essential oil composition, phenolic compound, and antioxidant potential of Inulaviscosa as affected by extraction process

The purpose of this study was to compare the essential oil composition of Inula viscosa leaves by hydrodistillation (HDE), ultrasonic (UDE) and solvent (SE) extractions followed by hydrodistillation. The total polyphenol and flavonoid contents and their antioxidant effects were studied by different solvent of extraction: ethanol (ET), ethyl acetate (EA), methanol (ME) and aqueous (AE). The principal compounds for HDE were: 2-hexenal (3.70%), caryophyllene oxide (3.11%), γ-selinene (3.09%), 3-hexen-1-ol (2.00%), eugenol (1.70%) and trans-caryophyllene (1.34%), while for UDE were: γ-selinene (5.68%), caryophyllene oxide (4.87%), trans-caryophyllene (1.99%) and nerolidol (1.74%). The oil obtained by SE was shown to contain tridecane (3.89%), dodecane (3.08%), trans-caryophyllene (2.94%), caryophyllene oxide (2.56%) and nerolidol (2.53%). Significant changes on phenolic contents were found between the different solvent of extraction. ME and AE extracts led to the highest total polyphenol (PHL) and flavonoid (FL) amounts. The anti-radical activity and reducing power were maximal in AE and ME extract. HPLC examination established that the ferulic acid as major phenolic acid in ME and AE fractions, whereas luteolin was the main compound of EA and ET fractions

Phenological stage effect on phenolic composition and repellent potential of Mentha pulegium against Tribolium castaneum and Lasioderma serricorne

Objective: To elucidate for the first time the phenological stage effect on polyphenol, flavonoid and proanthocyanidin contents of pennyroyal (Mentha pulegium) as well as their antioxidant capacities and insecticidal potentials against Tribolium castaneum and Lasioderma serricorne. Methods: Crude methanol extracts from pennyroyal (Mentha pulegium) aerial parts were evaluated for their antiradical, reducing power activities and repellent potentials against selected coleopteran insects during different phenological stages. Results: Phenolic contents of pennyroyal aerial parts and their antioxidant effects were significantly dependent on maturity stage of the plant. The maximum of phenol production was reached during the full flowering stage. Apigenin was the major phenol in Mentha pulegium with an amount of 6.01 mg/g of dry vegetable matter during this period. Nevertheless, at fructification stage, the highest antioxidant activity was not related to high phenolic content. The repulsive effect of pennyroyal extract showed that Lasioderma serricorne was more susceptible to pennyroyal extract than Tribolium castaneum with corresponding median repellent dose values of 0.124 and 0.006 mg/mL respectively. Moreover, great differences in insect repulsion depending on extract concentrations, exposure time and developmental stage was observed. For the lowest concentration (0.125 mg/mL), the repellent effect against Tribolium reached its maximum (90%) during the fructification stage (after 24 h of exposure) while this repellent effect was 80% during the vegetative stage. Conclusions: Due to the strong insecticidal potential of pennyroyal extracts, this study highlights the therapeutic properties of this plant and encourages its use as a safer, environmental-friendly and efficient insecticide in food industry