Production Of Cold And Hot Press Of Nigella Sativa L Oil And Meal Using Screw Press
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Date
2011-11
Authors
Silvia, Deli
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
Effects of physical parameters of a screw press machine on oil yield of N. sativa seeds were studied using a KOMET Screw Oil Expeller. Different nozzle size (6, 10, and 12 mm), extraction speed (21, 54, 65 and 98 rpm) and diameter of shaft screw (8 and 11 mm) pressed at 60 °C were applied in this study. Highest percentage of oil yield recorded was at combination of shaft screw with diameter of 8 mm, rotational speed at 21 rpm and nozzle size of 6 mm. Oil yields were higher at 50 °C (cold press) (22.68 %) and lower at 100 °C (hot press) (15.21 %). Percentage meal yield of N. sativa seeds were lower at 50 °C (73.48 %) and higher at 100 °C (80.50 %). The oil and meal yield were significantly different (p<0.05) in different temperatures.
Physicochemical and quality characteristics of N. sativa seed oil pressed at cold and hot press (50 °C, 60 °C, 70 °C and 80 °C, 90 °C, 100 °C) temperatures were determined. Results obtained for different temperatures; FFA and AV respectively, were lowest at 100°C (0.19% and 0.39%) and highest at 80°C (0.24% and 0.47%); K232 constant for all temperatures ranged from 2.82 to 2.83 and K270 was lowest at 50°C (1.48) and highest at 100°C (1.61); carotenoid at 50°C (1.95 mg/kg) was lowest compared to 100°C (2.46 mg/kg); SN was lowest at 50°C (132.75 mg KOH/g oil) and highest at 70°C (198.21 mg KOH/g oil ); viscosity at 60°C (63.80 mPaS) was lower than that of 100°C (71.47 mPaS); peroxide value was highest at 80°C (342. meq O2/kg oil) and lowest at 50°C (204.58 meq O2/kg oil, chlorophyll ranged from 1.97 to 2.50 mg/kg and density ranged from 0.93 to 0.98 g/cm3. The colour was from greenness to yellowness with increasing temperatures. Sensory analysis panellists were liked moderately of oil pressed at 60° C.
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Keywords
Effects of physical parameters of a screw press machine , on oil yield of N. sativa seeds