Olive and sunflower-oils by no-press cloth mechanical pressing. Physico-chemical characterisation and cost/benefit analysis
1994
Contini, M. | Moresi, M. (Universita della Tuscia, Viterbo (Italy). Istituto di Tecnologie Agroalimentari)
In this work the analytical characteristics of sunflower- and olive-oils, mechanically expressed in a novel pilot plant, were compared with those of the corresponding commercial oils. The experimental expression yields for clarified sunflower- and olive-oils resulted to be 34% and 19% by weight, respectively. The expression sunflower-oil had a pleasant golden yellow colour and no distinctive odour with all analytical characteristics, except for free fatty acid (1.14% as oleic) and total tocopherol content (1583 micron g/g), in line with literature data. The olive-oil exhibited the typical organoleptic properties of fresh extravirgin olive oils with a quite high total tocopherol content (510 micron g/g). With reference to a 3-press plant, it was possible to evaluate the overall return-on-the investment as a function of the plant working period (80 and 220 days/year) and type of raw materials treated (olives and sunflower seeds). By selling the expression sunflower-oil at the same price of refined peanut-oil (Lit 1840/kg) and the extravirgin olive-oil at Lit 9000/kg, an overall profitability (PR) of 15.7% might be obtained, this being quite greater than that achievable when feeding the plant only with olives (PR = 5.9%) or sunflower seeds (PR = 1.3%)
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