Production and stabilization of cold pressed sunflower oil : final thesis

Hladno prešano suncokretovo ulje proizvodi se prešanjem najkvalitetnijih suncokretovih sjemenki. Postoji nekoliko faza pripreme sirovine: čišćenje, sušenje, ljuštenje i mljevenje. Sušenjem se odstranjuje voda, to je vrlo važna faza pripreme sirovine za preradu jer se osušene sjemenke mogu duže čuvati (skladištenje vlažne sirovine pogoduje razvoju plijesni), a osim toga i bolje se prerađuje od vlažne sirovine. Nakon pripreme sirovine, sirovo ulje se iz sjemenki cijedi prešanjem, a zatim se čisti kako bi se očuvala dobra senzorska svojstva ulja. Dobiveno ulje se može kvariti zbog brojnih utjecaja, od kojih je najčešće kvarenje uzrokovano oksidacijskim procesom. Kako bi se produljila trajnost hladno prešanog ulja i spriječila autooksidacija, primjenjuju se antioksidansi i sinergisti, koji usporavaju oksidacijsko kvarenje ulja. Za stabilizaciju biljnih ulja koriste se prirodni i sintetski antioksidansi. Danas se prednost daje prirodnim antioksidansima (ekstrakti začinskih biljaka). Cold-pressed sunflower oil is produced by pressing of the finest sunflower seeds. There are several stages in the preparation of raw materials: cleaning, drying , peeling and grinding. Drying implies removing the water, so this is a very important phase in preparation of raw materials for processing, because the dried seeds can be stored longer (wet storage of raw materials is suitable for the mold development), and better processing than wet materials. After preparation of raw materials, crude oil is squeezed by pressing the seeds, and then cleaned in order to maintain its good sensory properties. The resulting oil can spoil due to numerous influences, and the most common spoilage is caused by the oxidation process. To prolong the shelf life of the cold pressed oil and prevent autoxidation, producers apply antioxidants and synergists, which inhibit oil deterioration. The natural or synthetic antioxidants are used for stabilization of vegetable oils. The natural antioxidants are preferred today (extracts of herbs).