A presentation on linseed oil

A presentation on linseed oil

• 2.
  Synonyms flax seed;Linum  Biologicalsource This consists of fixed oil obtained from the dried fully ripe seeds of Linum usitatissimum linn belonging to family Linaceae. Geographical source linum is found in Russia,canada,U.S.A,argentina,Egypt,Spain,Tur key,Afghanistan,Nepal and India.In India it is cultivated for oil as well as fibres.Though origin of linseed oil is uncertain,is believed as indigenous to India.
• 3.
   It needsabout 175cm of rainfall and grows well in black cotton soil.  The cultivation is done by sowing seeds on october and the crop is ready by february/march  Broadcasting method of cultivation is adobted and the distance kept between two rows is about 30cm.  Irrigation and fertilizer(like urea and ammonium sulphate)are given to the plant aacording to their requirement.
• 4.
   Plants arecut close to the ground,and they are allowed to dry for 2-3 days and are then thrashed to break the capsules.  Seeds coming out are separeted by winnowing.  The seeds are sieved and packed in gunny bag.
• 5.
   Commercially linseedoil is produced by use of expellers.  Before the seeds are subjected to the expellers seeds are sieved to make free of earthy matter and other materials.They are rolled into meal,then moistened and heated by means of steam jacketed troughs filled over the expellers.  An average yield of oil is 30-35 %.  The expressed oil is tanked for a long period to settle the colouring matter and mucilage.  The oil is then treated with alkali immediately after filtration.as alkali treatment helps to remove free fatty acids.  Bleaching of the oil is done by using either charcoal or fueller’s earth at elevated temperature.  The refined oil so abtained,is chilled to separate wax.
• 6.
   Colour -pale yellow coloured clear liquid.  Odour - characteristic.  Taste – pleasant.  Linseed oil gradually thickens on exposure to air forming a thin transparent film.  It is slightly soluble in alcohol,insoluble in water and miscible with ether,petroleum ether and chloroform.
• 7.
  Seeds of linseedLinseed oil in the form of capsule
• 8.
  Linseed plant Flowerof a linseed
• 10.
   specific gravity: 0.927- 0.931  Refractive index : 1.4786-1.4815  Iodine value : 160-200  Acid value : not more than 4
• 11.
   It containthe glycerides of palmitic ,stearic,oleic;linoleic and linolenic acids.  The unsaponifiable matter of the oil contains considerable quantities of sterols,tocopherol,and squalene.  Linseed oil also contain 3-omega fatty acids.
• 12.
   Large quantitiesare used for paints and varnishes  Medicinally,for external applications like lotions and liniments.  Used in treatment of scabies and other skin diseases.  It is nutritive and emmollient too.  Industrially,used for manufacture of soap,greases,polishes,etc.
• 13.
  An overdose oflinseed oil may cause serious side effects like:  weakness  Nausea and vomiting  Seizures and paralysis  Severe allergic reaction(characterised by swelling of face,excessive itching,difficulty in breathing and heart palpitations)  Daily linseed oil over supplementation may act as a blood thinning agent.
• 14.
  It is adulteratedwith  boiled linseed oil  Cotton seed oil  Sunflower oil  Mineral oil  Fish oil  Mustard oil