Glasnik Zaštite Bilja, Vol. 32 No. 5, 2009.
Original scientific paper
Influence of degumming process on rheological properties of crude sunflower seed oil
Tihomir Moslavac
; Prehrambeno-tehnološki fakultet Osijek
Bojana Tovjanin
; Prehrambeno-tehnološki fakultet Osijek
Đani Benčić
; Agronomski fakultet Sveučilišta u Zagrebu
Abstract
Degumming is the treatment of crude oils with water, dilute acids (phosphoric or citric acid) to remove the phosphatides and mucilaginous material from the crude oil. The aim of this paper is to examine the influence of acid type and degumming process parameters (contact temperature of acid and oil, contact temperature and time of agitation of oil and water) on rheological properties of crude sunflower oil. Diverse degumming agents (citric acid, ascorbic acid, tartaric acid- amount 0.3% of mass oil), all used in a concentration of 50%, acid and oil contact temperature (50oC, 70oC, 80oC), 2% of water was added, water and oil contact temperature (25oC, 40oC, 70oC), contact time with water (30, 60 and 90 minutes with agitation) were used. Efficiency of oil degumming was monitored by determining rheological properties of oil and yield and loss of oil. Measurements of rheological properties of degumming oil were performed using rotational viscosimeter at 25oC. The rheological parameters were determined by the Newton law. The results of the research have shown that all the investigated systems had Newtonian characteristics.
Degumming of sunflower oil with citric acid results in a better efficiency in removing of phospholipids (lower viscosity of oil) with regard to tartaric and ascorbic acid. Best results were obtained at contact temperature of acid and oil at 80oC and temperature contact of oil with water 70oC using 60 minute agitation.
Keywords
acid-water degumming; crude sunflower oil; rheological properties; oil yield
Hrčak ID:
163425
URI
Publication date:
16.11.2009.
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